Answer:
0
Explanation:
the block is being pulled at a constant velocity meaning it has no acceleration. the rule is fnet=mass x acceleration so if theres no acceleration there is no force net!
A block of mass 2 kg is pulled across a surface with a force of 15 N then the net force acting on the block is 0.
What is Force?A force is an effect that can alter an object's motion according to physics. A force might cause an object has mass to accelerate when it changes its velocity, for, us when it moves away from rest. An obvious way to describe force is in terms of push or pull. A force is a vector quantity since it has equal magnitude and direction. It is calculated using the newton SI unit (N). Force is denoted by the letter F.
The net force exerted by an object was equal to the speed at which its velocity varies over time, according to Newton's second law in its original formulation.
The block has no acceleration because it is being pushed at a constant speed. If there is no acceleration, there is no force net because the formula is net force =mass × acceleration.
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What is the Sl unit for momentum?
O kg• m
O kg
O kg• m
O kg
2
m
Explanation:
The S. I. unit of momentum is Kg. m/sechope it helps you
I am giving 18 points. Please try and don’t just do it for the points.
They won’t let me shown the very last picture, it looks like the normal L shape that is in every picture, and just one straight line. L—
Like that.
Which of the following graphs below represents the motion of an object at variable speeds? (3 points)
Distance
(miles)
Time
(hours)
Distance
(miles)
Time
(hours)
Answer:Distance.
Explanation:
Evelyn is making a model of Earth to show how the physical layers correspond to the compositional layers. Which of the following should Evelyn show in her model?
The physical layers exactly match the compositional layers.-A
The crust is the only compositional layer not included in the physical layers. -B
The physical layers of the inner core and outer core form a single compositional layer. -C
The physical layer of the asthenosphere includes the compositional layer of the crust.-D
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Answer:
B
Explanation:
What are the characteristics of a blackbody radiator? Give an example.
Answer:
A blackbody, or Planckian radiator, is a cavity within a heated material from which heat cannot escape. No matter what the material, the walls of the cavity exhibit a characteristic spectral emission, which is a function of its temperature.
Example:
Emission from a blackbody is temperature dependent and at high temperature, a blackbody will emit a spectrum of photon energies that span the visible range, and therefore it will appear white. The Sun is an example of a high-temperature blackbody.
the human body station 2
Answer:
...?
Explanation:
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The box is applying 22 N of force on the table, but the box is not moving 22 N If there is a downward force of 22 N, why is the box not moving downward?
Answer:
A reaction force
Explanation:
The box is not moving downward because the table is applying an equal and opposite amount of force on the box.
This is the premise of Newton's third law of motion which states that "action and reaction are equal and opposite".
The action force impacted by the downward pull on the table is being cancelled out by the upward force of the table.
The net force in the vertical direction will therefore be 0N This way, the box does not move downward.What is used to turn the pointer of a galvanometer?
a.
a crank
b.
an electric current
c.
a bar magnet
d.
a battery
Answer:
b. an electric current is used to turn the pointer of a galvanometer
Explanation:
well , galvanometer is an important device which is used to detect an electric current through a conductor or circuit.
something special about it is that it can detect very minute current too
Answer:
b
Explanation:
how would a position-time function look like for linearly increasing negative velocity regions?
Answer:
Hmmm
Explanation:
Here what I know... If a function gives the position of something as a function of time, the first derivative gives its velocity, and the second derivative gives its acceleration. So, you differentiate position to get velocity, and you differentiate velocity to get acceleration. where t is in seconds and H(t) is in inches.
Does this help?
How can shorter string produce more fundamental frequency in two string of different length?
Answer:
Shorter string produces more frequency in two different strings because the equation for frequency is velocity/wavelength , this means that a shorter string creates a shorter wavelength which essentially increases the total frequency produced
Which term is also known as a "rate of change"? * a motion b distance c reference point d speed
Acceleration is the answer.............
Which list includes the phase changes that require a loss of energy (heat)?
a. sublimation and deposition
b. condensation, freezing and deposition
c. freezing and melting
d. melting, vaporization and sublimation
Answer:
b
Explanation:
because if you freeze somthing you do not gain heat you loss heat.
Sam is moving house and is carrying a 300N box of books up a flight of steps 5m high, it takes her 30 seconds. Gary follows her carrying a bag of clothes doing 1000 J of work; it only takes him 25 seconds. Who provides the biggest power? Show your working.
Answer: Sam provides the biggest power
Explanation: Power is defined, in Physics, as the rate of work done. Work is energy transferred to an object due to the force causing the displacement of the object.
So, to determine Power:
For Sam:
P = [tex]\frac{work}{time}[/tex]
[tex]P=\frac{F.d}{t}[/tex]
[tex]P=\frac{300.5}{30}[/tex]
P = 50 Watts
The unit for Power is [P] = J/s = Watt
For Gary:
P = [tex]\frac{work}{time}[/tex]
[tex]P=\frac{1000}{25}[/tex]
P = 40 Watts
Comparing power of Sam and Gary, we can conclude that Sam provides the biggest power of 50 Watts.
A bungee jumper starts with 1000 J in their GPE store. After they jump they fall and are brought to a stop with the bungee cord. With the cord fully stretched what is the energy in the EPE store?
Answer:
energy is equal to 1000 J
Explanation:
When the jumper is in the tent, he has a given height, this height gives him a gravitational potential energy, which forms his initial mechanical energy of 1000 J. After jumping, this energy is converted into elastic energy of the rope plus a remainder of potential energy gravitational, it does not reach the ground, but as the friction is negligible the total mechanical energy is conserved, therefore its energy is equal to 1000 J
This is a case of energy transformation, but the total value of mechanical energy does not change
When materials absorb heat, the kinetic energy of the particles _________?
a. increases
b. decreases
c. remains the same
Answer:
A
Explanation:
The atoms started to get "overly excited" and started to move faster than they usually do. When this happens, energy is released in the form of heat, light or etc. Because of this, kinetic energy increases and atoms colliding with each other happens more often.
Ozone gas in the atmosphere protects living things on Earth from some of the Sun's harmful
rays. The chemical formula for ozone is 03.
Complete the statement.
Ozone is
an elementary substance
or is it an compound
Answer:
Ozone is a compound.
Explanation:
Elements are simple atoms that can merge or combine to produce a bigger molecule called a compound. They can not be splitted into smaller atoms. Examples are: hydrogen, carbon, etc.
A compound is formed as a result of the combination of two or more elements. They can be splitted into elements. Examples are: ammonium, water, carbon dioxide etc.
Ozone ([tex]O_{3}[/tex]) is a less stable allotrope of oxygen which is made up of three atoms of oxygen. Therefore, it is a compound.
if an object with a mass of 248kg is lifted 76 meters in 18 seconds, how much power is used?
Explanation:
power = 1/2 mass × velocity^2 >>1
velocity = distance / time = 76 /18 = 4.2m
then power = 1/2 × 276 × (4.2)^2 = 138 × 17.64 = 2,434.3 jules.
Which of the following is not a shared similarity between warm-up and cool-
down routines?
A. Stretches performed can be the same.
B. Consist of a modified version of the exercise performed, such as a
slow jog before or after a strenuous run.
C. Restore muscles to their resting length.
D. Help prevent injury.
C. Restore muscles to their resting length
Hope this helps:)
Given the impulse acting on an object and the impact time which equation can be used to calculate the force applied to an object
Answer is D
Ndmdjdndbdjdkskd
The impulse acting on an object and the impact time, the equation F= I / Δt can be used to calculate the force applied to an object, therefore the correct answer is D.
What is impulse?The product of the average applied force and the time for which it is exerted is known as an impulse.
the mathematical relation for impulse is
Impulse = F * Δt
where F represents the force applied and Δt represents the time for which the force is applied
Thus, the correct equation that can be used to calculate the force applied to an object is F = I /Δt and the correct option is D.
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• How can you find the temperature in Fahrenheit when its given in the
Celsius scale?
I
Answer:
there are conversion scales used for doing that
to convert Celsius to Fahrenheit we use the formula,
T(°F) = T(°C) × 9/5 + 32
and to convert Fahrenheit to Celsius we use,
T(°F) = T(°C) × 5/9 + 32
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Explanation:
Name two sub-kingdoms of plant kingdoms
Answer:
⭐. cryptogams ( non-flowering & non-seed bearing)
⭐. phanerogams ( flowering & seed bearing)
TRUE OR FALSE Light can travel through materials that you cannot see through, like wood or aluminum foil.
Answer: TRUE
Explanation:
(Example): If there was lightening outside, the lightening (light) could travel through a tree (that you cannot see through).
The statement Light can travel through materials that you cannot see through, like wood or aluminum foil, is True.
What is light?Electromagnetic radiation that the human eye can detect as light. The wavelengths of electromagnetic radiation cover a very broad spectrum. Information about space and time is transmitted by light. This characteristic serves as the foundation for the study of optics, optical communications, and a wide range of other related, both established and developing technologies.
Lasers, holography, and fiber-optic communication systems are examples of technologies that use light manipulation. The electromagnetic spectrum, which includes all forms of light, propagates in a vacuum at the same speeds, c. only a small portion of which is visible to humans. And it is unquestionably possible for non-visible light to pass through wood, including radio waves, x-rays, and gamma-energy photons.
Therefore, the statement Light can travel through materials that you cannot see through, like wood or aluminum foil, is True.
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The distance that the pointer of a galvanometer moves depends on the amount of magnetism in the loops of the armature.
Please select the best answer from the choices provided
T
F
What is the relationship among
gravitational force, mass, and the distance
between two objects, as described by
Newton's law of gravitation?
7. Which phase changes require a gain of energy (heat)?
a. melting and freezing
b. sublimation and vaporization
c. vaporization and condensation
d. sublimation and deposition
Answer:
c
Explanation:
Answer:
C.
Explanation:
When there is heat the water turns into vapour if not covered but will turn back to water if covered (condensation)
Which of the following formulas is the correct equation for the law of Universal gravitation?
Answer:
F = GMm / r²
from Newton's law of gravitational attraction
4. An 85 kg object has 2.16 x 10 J of kinetic energy. What is the object's velocity?
Answer:
v = 0.713[m/s]
Explanation:
Kinetic energy is defined as the product of mass by the squared velocity of a body. In this way with the following expression we can have the kinetic energy as a function of velocity.
[tex]E_{kin}=0.5*m*v^{2}[/tex]
where:
m = mass = 85 [kg]
v = velocity [m/s]
Ekin = kinetic energy = 2.16*10 [J]
[tex]2.16*10 = 0.5*85*v^{2}\\v =\sqrt{0.508} \\v= 0.713[m/s][/tex]
A sound wave traveling through dry air has a frequency of 16 Hz, a
wavelength of 22 m, and a speed of 350 m/s. When the sound wave passes
through a cloud of methane, its wavelength changes to 28 m, while its
frequency remains the same. What is its new speed? (The equation for the
speed of a wave is v= f x.)
A. 350 m/s
B. 9,800 m/s
C. 450 m/s
D. 13 m/s
Answer:
C. 450
it should be right
The new speed of sound wave is 450 m/s. Hence, option (C) is correct.
What is sound wave?A sound wave is the pattern of disruption brought on by the movement of energy moving through a medium as it propagates away from the source of the sound (such as air, water, or any other liquid or solid matter).
Pressure waves are produced when an object vibrates, such as a ringing phone, and these waves are known as sound waves.
Frequency of sound wave is = 16 Hz.
Wavelength of the sound wave is = 28 m.
Hence, new speed of sound wave is = 16 × 28 meter/second
= 448 meter/second
=450 meter/second. (approx.)
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Which of the following is an example of kinetic energy?
athlete running in a race
battery charging in a garage
apple hanging from a tree
water boiling on a stove
Answer:
A. Athlete running in a race
Explanation:
Kinetic energy haves something to do with movement
Un consumator electric conectat la o tensiune de 220V are rezistenta electrica R=100ohmi Ce putere electrica are consumatorul? 1 point 484W 220W 440W