Answer:
the image can be rather real or virtual
A bumblebee can sense electric fields as the fields bend hairs on its body. Bumblebees have been conclusively shown to detect an electric field of 60 N/C . Suppose a bumblebee has a charge of 21 pC.
How far away could another bumblebee detect its presence?
Another bumblebee could detect the presence of the charged bumblebee from a distance of approximately 3.5 meters.
To determine the distance at which another bumblebee could detect the presence of the charged bumblebee, we can use Coulomb's law, which states that the electric force between two charges is directly proportional to the product of their charges and inversely proportional to the square of the distance between them.
The formula for the electric force between two charges is given by:
F = (k * q1 * q2) / r^2
where F is the electric force, k is the electrostatic constant (approximately 9 × 10^9 N·m^2/C^2), q1 and q2 are the charges, and r is the distance between the charges.
Given that the electric field detected by the bumblebee is 60 N/C, we can relate the electric field to the electric force using the equation:
E = F / q
where E is the electric field and q is the charge.
Rewriting the equation to solve for the electric force:
F = E * q
Substituting the given values:
F = (60 N/C) * (21 × 10^-12 C)
Simplifying:
F = 1.26 × 10^-9 N
Rearranging the Coulomb's law equation to solve for the distance:
r = sqrt((k * q1 * q2) / F)
Substituting the values into the equation:
r = sqrt((9 × 10^9 N·m^2/C^2 * (21 × 10^-12 C)^2) / (1.26 × 10^-9 N))
Simplifying:
r ≈ 3.5 meters
Therefore, another bumblebee could detect the presence of the charged bumblebee from a distance of approximately 3.5 meters.
Another bumblebee could detect the presence of the charged bumblebee from a distance of approximately 3.5 meters. This is based on the ability of bumblebees to sense electric fields and the known electric field strength and charge of the bumblebee in question.
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Pressure is ______________ to the force applied.
inversely proportional
directly proportional
not related
Explanation:
inversely proportional
Answer:
directly proportional to force applied
What statement about energy transfer in a wave is true?
Answer:
Energy moves between the particle of the medium.
Explanation:
at the instant shown, the spring is undeformed. determine the change in potential energy if the 20 kg disk (k_g = 0.5 m) rolls 2 revolutions without slipping.
The change in potential energy of the spring system is 15.6 x 10³J.
Mass of the disc, m = 20 kg
Velocity of the disc, v = 3 m/s
Spring constant of the spring, k = 200 N/m
Angular displacement of the disc, x = 2 revolutions = 2 x 2π = 4π radians
The potential energy that is stored when an elastic object is stretched or compressed by an external force, such as the stretching of a spring, is known as elastic potential energy. It is equivalent to the effort required to extend the spring, which is dependent on both the length of the stretch and the spring constant k.
The expression for the elastic potential energy of the spring is given by,
PE = 1/2 kx²
PE = 1/2 x 200 x (4π)²
PE = 1.57 x 10⁴J
The kinetic energy of the disc is given by,
KE = 1/2 mv²
KE = 1/2 x 20 x 3²
KE = 90 J
Therefore, the change in potential energy is,
E = 1.57 x 10⁴- 90
E = 15.6 x 10³J
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a 100 kg hoop rolls along a horizontal floor so that its center of mass has a speed of 0.0830 m/s. how much work must be done on the hoop to stop it?
The work done on the hoop to stop it is 0.344 Joules.
What is work done?
Work is defined as the transfer of energy that occurs when a force is applied to an object, causing it to move in the direction of the force. Work is the product of the force applied to an object and the displacement of the object in the direction of the force.
Given:
Mass of the hoop (M) = 100 kg
Speed of the center of mass (v) = 0.0830 m/s
Radius of the hoop (R) = ?
To find the radius (R) of the hoop, we can use the relationship between linear and angular velocity:
v = R * ω
Rearranging the equation, we get:
R = v / ω
We need to find the angular velocity (ω) of the hoop. Using the relationship between linear velocity and angular velocity, we have:
ω = v / R
Substituting the given values, we can calculate the angular velocity:
ω = 0.0830 m/s / R
Next, we can calculate the moment of inertia (I) of the hoop:
I = MR^2
Substituting the mass and radius, we get:
I = 100 kg * R^2
Now, we can calculate the initial kinetic energy (KE_initial) of the hoop:
KE_initial = (1/2) * I * ω^2
Substituting the values, we have:
KE_initial = (1/2) * (100 kg * R^2) * (0.0830 m/s / R)^2
Simplifying the equation, we get:
KE_initial = (1/2) * 100 kg * 0.0830^2 m^2/s^2
Finally, the work done on the hoop to stop it is equal to the initial kinetic energy:
Work = KE_initial
Substituting the values, we have:
Work = (1/2) * 100 kg * 0.0830^2 m^2/s^2
Calculating the value, we find:
Work ≈ 0.344 J
Therefore, the work done on the hoop to stop it is 0.344 Joules.
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Two identical planets orbit a star in concentric circular orbits in the star's equatorial plane. Of the two, the planet that is farther from the star must have a. the smaller period. b the greater period. c. the smaller gravitational mass. d. the larger gravitational mass. e the larger universal gravitational constant.
Two identical planets orbit a star in concentric circular orbits in the star's equatorial plane. The planet that is farther from the star must have a greater period than the planet that is closer to the star. The correct answer is option(b).
The period of the planet is directly proportional to the cube of its distance from the star. As a result, when planets are equidistant from a star, their periods will be equal.As a result, the planet that is farther from the star must have a greater period than the planet that is closer to the star.
A planet's gravitational mass is not influenced by the planet's distance from the star, so alternatives c and d can be ruled out. Similarly, the planet's universal gravitational constant is not affected by the planet's distance from the star, so option e can also be ruled out. The planet's period, on the other hand, is influenced by the distance from the star and the planet's mass. As a result, the option a can be ruled out.
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a 100 mm long line is parallel to and 40 mm above the h.p. its two ends are 25 mm and 50 mm in front of the v.p. respectively. draw its projections and find its inclination with the v.p.
The line, 100 mm in length, is parallel to and 40 mm above the h.p. Its ends, positioned 25 mm and 50 mm in front of the v.p., are connected to form projections. The inclination with the v.p. is 48.59°.
Determine how to find the projections of the line?To draw the projections of the line, we start by drawing the plan view (H₁) and the front view (V₁).
In the plan view (H₁), we draw a horizontal line of 100 mm length. The line is parallel to the horizontal plane (h.p.), so it remains at the same height as the h.p.
In the front view (V₁), we draw a vertical line to represent the height above the h.p. Since the line is 40 mm above the h.p., we draw a line 40 mm long above the ground line. Then, we draw the line segments representing the ends of the line.
The first end is 25 mm in front of the vertical plane (v.p.), and the second end is 50 mm in front of the v.p. We connect these ends to the top of the vertical line to complete the front view.
To find the inclination of the line with the v.p., we use the right triangle formed by the height of the line (40 mm) and the distance from the v.p. to the second end of the line (50 mm). We can calculate the inclination angle using the tangent function:
tan(θ) = opposite/adjacent = 40/50
Solving for θ, we find:
θ = tan^(-1)(40/50) = 48.59°
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What is the height of the image? Round the answer
the nearest whole number.
Characteristic
Value
cm
What type of mirror most likely formed this image?
Focal length
13 cm
Distance of object from mirror
8 cm
Distance of image from mirror
-21 cm
Height of object
4 cm
Answer:
11 cm and concave
Explanation:
edge 2021
Answer:
it is -21, The top part is correct it is only the second part this is the first part.
Explanation:
A thin layer of magnesium fluoride (n=1.38) is used to coat a flint glass lens ( n=1.61). (a) What thickness should the magnesium fluoride film have if the reflection of 565 nm light is to be suppressed? Assume that the light is incident at right angles to the film. (b) If it is desired to suppress the reflection of light with a higher frequency, should the coating of magnesium fluoride be made thinner or thicker? Explain.
(a) The thickness of the magnesium fluoride film should be approximately 120 nm to suppress the reflection of 565 nm light.
(b) To suppress the reflection of light with a higher frequency, the coating of magnesium fluoride should be made thinner.
(a) The condition for suppressing reflection is given by the equation:
2nt = mλ
where n is the refractive index of the film, t is the thickness of the film, m is an integer representing the order of the interference, and λ is the wavelength of light.
For reflection suppression of 565 nm light, we can substitute the given values:
2(1.38)t = λ
2(1.38)t = 565 nm
t = (565 nm) / (2(1.38))
t ≈ 120 nm
Therefore, the thickness of the magnesium fluoride film should be approximately 120 nm to suppress the reflection of 565 nm light.
(b) To suppress the reflection of light with a higher frequency, the coating of magnesium fluoride should be made thinner. This is because higher frequencies correspond to shorter wavelengths. As the wavelength decreases, the required thickness of the film for interference suppression decreases. So, a thinner coating of magnesium fluoride would be needed to achieve reflection suppression for higher-frequency light.
(a) To suppress the reflection of 565 nm light, the magnesium fluoride film should have a thickness of approximately 120 nm.
(b) To suppress the reflection of light with a higher frequency, the coating of magnesium fluoride should be made thinner. This is because higher frequencies correspond to shorter wavelengths, requiring a smaller film thickness for interference suppression.
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how many liters of hydrogen gas are formed from the complete reaction of 1.21 mol of c ? assume that the hydrogen gas is collected at a pressure of 1.0 atm and a temperature of 319 k .
The complete reaction of 1.21 mol of carbon (C) produces 2.42 mol of hydrogen gas (H2), which is equivalent to approximately 54.5 liters.
The balanced chemical equation for the reaction between carbon and hydrogen gas is:
[tex]C + 2H_2 -- > CH_4[/tex]
From the balanced equation, we can see that for every 1 mole of carbon (C), 2 moles of hydrogen gas (H2) are required to form 1 mole of methane (CH4). Since the reaction is complete, all the carbon will be consumed, and therefore the moles of hydrogen gas produced will be twice the moles of carbon.
Given that we have 1.21 mol of carbon, we can calculate the moles of hydrogen gas produced by multiplying the moles of carbon by 2:
2.42 mol H2 = 1.21 mol C × 2 mol H2 / 1 mol C
To convert the moles of hydrogen gas to liters, we can use the ideal gas law, which states that PV = nRT, where P is the pressure, V is the volume, n is the number of moles, R is the ideal gas constant, and T is the temperature. Rearranging the equation to solve for V, we have:
V = (nRT) / P
Substituting the given values into the equation and solving for V, we get:
V = (2.42 mol H2 × 0.0821 L·atm/mol·K × 319 K) / 1.0 atm
V ≈ 54.5 liters
Therefore, approximately 54.5 liters of hydrogen gas are formed from the complete reaction of 1.21 mol of carbon.
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If weight=net force= gravitational force
why does weight= mass* gravitational field strength like mass and gravitational field strength are the same thing or is it not please help (I'll give brainliest)
Weight is the force experienced by an object due to gravity and is equal to the product of its mass and gravitational acceleration.
Weight is not equal to mass multiplied by gravitational field strength. Weight is actually the force experienced by an object due to gravity, and it is given by the equation:
Weight = mass * gravitational acceleration
The gravitational acceleration is denoted by "g" and represents the acceleration due to gravity at a particular location. It is a constant value and does not depend on the mass of the object. On the surface of the Earth, the average value of gravitational acceleration is approximately 9.8 m/s^2.
So, the correct equation for weight is:
Weight = mass * gravitational acceleration
The reason weight is equal to the product of mass and gravitational acceleration is due to Newton's second law of motion. According to this law, the force acting on an object is equal to the product of its mass and acceleration. In the case of weight, the force acting on an object is the gravitational force, which is proportional to its mass (through the equation F = ma) and the gravitational acceleration.
Therefore, It's important to note that mass and gravitational field strength are not the same thing. Mass is a property of matter that measures the amount of material in an object, while gravitational field strength (or gravitational acceleration) is a measure of the intensity of the gravitational field at a specific location.
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Question:
Define Force
Force is push or pull....
thank you
Do convex lens converge or diverge the light rays?
Answer:
converge
plz mark me as brainliest.
Two 5.0 - cm-diameter rings are facing each other 5.0 cm apart. Each is charged to +3.0nC. Part A What is the electric potential at the center of one of the rings? Express your answer with the appropriate units.
To find the electric potential at the center of one of the rings, we can use the formula for the electric potential due to a charged ring: V = k * Q / r
where V is the electric potential, k is the Coulomb's constant (8.99 × 10^9 N m²/C²), Q is the charge of the ring, and r is the distance from the center of the ring. In this case, the charge of each ring is +3.0 nC (nanocoulombs) = 3.0 × 10^-9 C, and the distance from the center of the ring is half of the diameter, which is 5.0 cm = 0.05 m. Plugging in the values, we have: V = (8.99 × 10^9 N m²/C²) * (3.0 × 10^-9 C) / 0.05 m. Calculating this expression will give us the electric potential at the center of one of the rings.
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A contour map has 14 concentric circles, each placed 1/2 centimeters apart. The map's scale indicates 1cm = 10 ft. What is the structure, and what are its dimensions?
Answer:
B. A hill 70ft tall.
Explanation:
Why does grass look black under the moonlight?
Answer:
The moon doesn’t have light of its own, the moon lights up because of the sun. So at night, as the light of the sun doesn't reach the grass directly because of the moon, it doesnt reflect any color off the grass, and so our eyes detect grass as black.
Explanation:
Sun appears white, but it is made up of the colors: red, orange, yellow, green, blue, indigo, and violet. When white light hits an object, it absorbs some colors and reflect the others. Grass appears green because it absorbs all the wavelengths except green. Green is reflected off the grass, so we see grass as green.
The ancient Egyptians build their pyramids using a ramp to move the heavy blocks up. The length of the ramp was 25m and the height was 10m the weight of the block was 250kg and the effort weight is 180kg. What is the efficiency of the inclined plane
Answer:
Efficiency of the inclined plane is 56%
Explanation:
efficiency = (work output / work input) x 100%
efficiency = ([load force x load distance] x [effort force x effort distance]) x 100%
efficiency = (250 kg x 10 m) / (180 kg x 25 m) x 100%
efficiency = (2500kg/m) / (4500kg/m) x 100%
efficiency = 0.555 = 0.56 x 100%
efficiency = 56%
how many nucleons does sulphur have
Answer:
32
Explanation:
Answer:
32
Explanation:
Sulfur has 16 protons and 16 neutrons. The atomic number is roughly 32. Therefore, 16 + 16 = 32 nucleons.
In context of nepal it is better to use energy like solar power .why?
Answer:
Nepal is one of the least developed countries. Solar power is well-founded than electricity. It's better to use solar power because it's a clean resource, the sun provides more energy than we will ever need.
Explanation:
I neeed help im so comfused Points Possible: 1, Points Correct: 0 Which group of numbers is listed from greatest to least? -3, -1, 0, 2, 7 9, 7, 6, -5, -4 8, -6, 5, -4, 1 -3, -4, -7, -8, -9
The groups aren't well formatted ;
The groups are ;
(-3, -1, 0, 2, 7) ; (9, 7, 6, -5, -4) ; (8, -6, 5, -4, 1) ; (-3, -4, -7, -8, -9)
Answer:
(-3, -4, -7, -8, -9)
Explanation:
Given the following group of numbers :
Evaluating each group of values for which is correctly arranged from greatest to least.
(-3, -1, 0, 2, 7) : - 1 is greater than - 3 (the group isn't arranged from greatest to least)
(9, 7, 6, -5, -4) : - 4 is greater than - 5 ; hence, the group isn't arranged from greatest to least
(8, -6, 5, -4, 1) : 5 is greater than - 6 ; hence, the group isn't arranged from greatest to least
(-3, -4, -7, -8, -9) ; the group of numbers here is arranged from greatest to least ;
(-3 > -4 > -7 > -8 > -9) ; hence, the correct group
3 Which organisms survive well on volcanic islands?
1. bacteria
2. birds
3. plants
4. large animals
plants
i hope its right and have a nice day
Answer:
number 1
Explanation:
Determine the separation distance between two balloons with charges of +3.6*10^-8 C and -3.2*10^-8 C. They generate an electrical force of -2.2*10^-2 between them.
Answer:
0.0217 m
Explanation:
Ftom the question,
Applying Coulomb's law
F = kqq'/r²............... Equation 1
Where F = Electric Force, q and q' = First and second charge respectively, r = distance between the charges, k = coulomb's constant.
make r the subeject of the equation
r = √[(kqq')/F]............. Equation 2
Given: q = +3.6×10⁻⁸ C, q' = -3.2×10⁻⁸ C, F = -2.2×10⁻² N
Constant: k = 8.98×10⁹ Nm²/C²
Substitute these values into equation
r = √(+3.6×10⁻⁸×-3.2×10⁻⁸×8.98×10⁹/-2.2×10⁻²)
r = √(-103.4489×10⁻⁷/-2.2×10⁻²)
r = √(47.02×10⁻⁵)
r = 21.68×10⁻³
r ≈ 21.7×10⁻³ m.
r ≈ 0.0217 m
Hence the seperation between the two balloons is 0.0217 m
An entertainer pulls a table cloth off a table leaving behind the plates and sliverware undisturbed is an example of
A.
the law of balanced forces
B.
Newton's second law
C.
Newton's third law
D.
Newton's first law
Answer:
d.) Newton's first law
Explanation:
This is also called the law of inertia, which means that an object in motion will not stop unless a force is acted upon it, and vice versa. Try this out with a piece of paper and a quarter. Pull the paper from under the quarter slightly quick, and the quarter will stay on the table. Hope i helped you.
Conclusion: Suggest an equation relating Felect, q1, q2 and d of the form Felect = k•... where k is a proportionality constant (no need to determine its value). Place the three variables q1, q2 and d on the right side of the equation in a numerator or a denominator; use a power if needed. Your equation should be consistent with your claims made in Challenge #1 and Challenge #2. *I already solved the rest of the worksheet, I only need the conclusion.*
Answer:
[tex]F_{elect} = \frac{kq_1q_2}{d^2}[/tex]
Explanation:
Consider the given variables:
Felect = Electrostatic Force between charged particles
k = Coulomb's Constant
q₁ = magnitude of first charge
q₂ = magnitude of second charge
d = distance between the charges
The relationship among these variables is given by the Coulomb's Law:
[tex]F_{elect} = \frac{kq_1q_2}{d^2}[/tex]
This is the relationship that contains k, q₁, q₂, d on the right-hand side and Felect on the left-hand side.
a source emits monochromatic light of wavelength 549 nm in air. when the light passes through a liquid, its wavelength reduces to 433 nm. What is the liquid's index of refraction?
A source emits monochromatic light of wavelength 549 nm in air. when the light passes through a liquid, its wavelength reduces to 433 nm, the liquid's index of refraction is approximately 1.269.
The index of refraction (n) of a medium can be calculated using the formula
n = λair / λmedium
Where λair is the wavelength of light in air and λmedium is the wavelength of light in the medium.
Given:
λair = 549 nm
λmedium = 433 nm
Substituting these values into the formula, we get
n = 549 nm / 433 nm
Simplifying the calculation
n = 1.269
Therefore, the liquid's index of refraction is approximately 1.269.
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A steel tank is completely filled with 1.60 m3 of ethanol when both the tank and the ethanol are at a temperature of 33.0 ∘C .
Part A
When the tank and its contents have cooled to 20.0 ∘C, what additional volume of ethanol can be put into the tank?
The additional volume of ethanol that can be put into the tank is 0.0136 m³.
The given informations are,
The steel tank is completely filled with 1.60 m³ of ethanol when both the tank and the ethanol are at a temperature of 33.0 °C. And we have to find what additional volume of ethanol can be put into the tank when the tank and its contents have cooled to 20.0 °C.Part A
When the tank and its contents have cooled to 20.0 °C, the volume of ethanol decreases due to the decrease in temperature.
Let's assume the volume of ethanol at 33.0 °C be V1 and at 20.0 °C be V2 and coefficient of cubical expansion of ethanol be α.
From the temperature coefficients of cubical expansion, we can say that the volume of ethanol decreases with decrease in temperature.
So, the additional volume of ethanol which can be put into the tank is,
Additional volume = V1 - V2
The volume of ethanol changes due to the change in temperature,
V2 = V1 / [1 + α (T2 - T1)]
where T1 and T2 are the initial and final temperatures of the ethanol in degree Celsius.
The coefficient of cubical expansion of ethanol, α = 1.12 × 10^-3 / °C.
Now, let's substitute the given values in the above equation:
V2 = 1.60 m³ / [1 + (1.12 × 10^-3 / °C) × (33.0 °C - 20.0 °C)]
V2 = 1.5864 m³
Therefore, the additional volume of ethanol that can be put into the tank when the tank and its contents have cooled to 20.0 °C is,
Additional volume = V1 - V2= 1.60 m³ - 1.5864 m³
= 0.0136 m³
Hence, the additional volume of ethanol that can be put into the tank is 0.0136 m³.
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3. Which of the following is true about astronauts taking out the TRASH?
They let it float off into space
They burn it inside the space station
They place it into a spacecraft and let it fall into the atmosphere
Answer:
C
Explanation:
When trash accumulates, astronauts manually squeeze it into trash bags, temporarily storing almost two metric tons of it for relatively short durations, and then send it away in a departing commercial supply vehicle, which either returns it to Earth or incinerates it during reentry through the atmosphere.
Find a power series representation for the function. f(x) = ln (7 - x) f(x) = ln (7) + sigma^infinity_n = 0 Determine the radius of convergence, R.
The power series representation for the function f(x) = ln(7 - x) is f(x) = ln(7) - ∑(n=0 to ∞) [(x - 7)^n / (n+1)].
To find the power series representation, we can use the Taylor series expansion of the natural logarithm function ln(1 + x):
ln(1 + x) = x - (x^2 / 2) + (x^3 / 3) - (x^4 / 4) + ...
In this case, we have the function f(x) = ln(7 - x), which can be rewritten as f(x) = ln(1 + (x - 7)).
Using the Taylor series expansion, we substitute (x - 7) in place of x:
f(x) = (x - 7) - [(x - 7)^2 / 2] + [(x - 7)^3 / 3] - [(x - 7)^4 / 4] + ...
Simplifying, we can write this as:
f(x) = -∑(n=0 to ∞) [(x - 7)^n / (n+1)]
Next, we add ln(7) to the series to account for the constant term:
f(x) = ln(7) - ∑(n=0 to ∞) [(x - 7)^n / (n+1)]
The radius of convergence, R, can be determined by using the ratio test. The ratio test states that if the limit of the absolute value of the ratio of consecutive terms in the series is L, then the series converges absolutely when L < 1 and diverges when L > 1.
In this case, we take the absolute value of the terms in the series and calculate the limit:
lim(n→∞) |(x - 7)^(n+1) / [(n+2)(x - 7)^n]|
Simplifying and taking the limit, we find:
lim(n→∞) |x - 7| / (n + 2)
Since this limit approaches zero for any value of x, the series converges for all values of x. Therefore, the radius of convergence, R, is infinity.
The power series representation for the function f(x) = ln(7 - x) is f(x) = ln(7) - ∑(n=0 to ∞) [(x - 7)^n / (n+1)]. The series converges for all values of x, indicating that the radius of convergence, R, is infinity.
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An electric motor consumes 8.00kJ of electrical energy in 1.00min. If one-third of this energy goes into heat and other forms of internal energy of the motor, with the rest going to the motor output how much torque will this engine develop if you run it at 2000rpm ?
The electric motor will develop a torque of approximately 1.27 Nm when run at 2000 rpm.
To calculate the torque developed by the electric motor, we need to use the relationship between power, torque, and rotational speed (rpm). Power is given by the formula:
Power = Torque × Angular velocity
where Angular velocity = 2π × (rpm/60) (converted from rpm to rad/s).
Given that the motor consumes 8.00 kJ of electrical energy in 1.00 min, we can convert this energy to joules:
8.00 kJ = 8.00 × 10^3 J
Since one-third of the energy goes into heat and other forms of internal energy, two-thirds of the energy is converted to motor output. Therefore, the energy converted to motor output is:
(2/3) × 8.00 × 10^3 J = 16/3 × 10^3 J
≈ 5,333 J
Now, we can calculate the power:
Power = Energy / Time
Given that the time is 1.00 min = 60 s:
Power = (5,333 J) / (60 s)
≈ 88.9 W
To find the torque, we rearrange the power formula:
Torque = Power / Angular velocity
Angular velocity = 2π × (2000 rpm / 60)
= (2π/60) × 2000 rad/s
Substituting the values into the formula:
Torque = (88.9 W) / [(2π/60) × 2000 rad/s]
Simplifying the equation:
Torque ≈ 1.27 Nm
Therefore, the electric motor will develop a torque of approximately 1.27 Nm when run at 2000 rpm.
When the electric motor is run at 2000 rpm, it will develop a torque of approximately 1.27 Nm.
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What is the energy of the 30 kg skateboarder at 2 m off the ground traveling at 3 m/s?