You are driving a metric car that has a speedometer that displays in meters per second. When you look down at your speedometer, you see that it reads 23 m/s, then 7.4 s later you look down and it reads 13 m/s. What is your average acceleration over those 7.4 s?
Electromagnetic waves differ from other types of waves because they are (2 points)
Group of answer choices
a. a continuous transfer of energy.
b. able to travel through a vacuum.
c. a visible form of energy.
d. able to move particles in a medium.
Answer:
b. able to travel through a vacuum.
Explanation:
The most distinguishing factor of an electromagnetic waves is that they are able to travel through a vacuum.
These waves do not require materials in a medium for propagation.
Electromagnetic waves are formed by the propagation of the electric and magnetic fields. They vibrate at an angle of 90° . They are unlike like mechanical waves that requires that requires materials in medium for their propagation.The car travels 52m in 21 seconds before it comes to a complete stop after the driver applies the brakes. What was the car's initial speed?
Answer:
2.48 m/s
Explanation:
D=vt
52 = V 21
V= 52/21=2.47m/s
An owl has a mass of 4.00 kg. It dives to catch a mouse, losing 800.00 J of its GPE. What was the starting height of the owl, in meters?
Answer:
h=20
Explanation:
gpe=mgh
800=4×10×x
x=20 hope it helps
Learning Task No. 3:
Use the diagram showing the relationship among current,
resistance and voltage. Explain the relationship between
current and voltage;
voltage and resistance;
current and resistance.
Write your answer below
Answer:
There is no diagram in this question, however, the question can be answered based on general understanding.
1. current and voltage; direct relationship
2. current and resistance; inverse relationship
3. voltage and resistance; direct relationship
Explanation:
The relationship between current (I), resistance (R) and voltage (V) has been explained by Ohms in his law. In Ohms law, which states that the current flowing through a circuit is directly proportional to the voltage and inversely proportional to the resistance.
This further means that if the voltage (V) increases, then the current (I) also increases and vice versa while if the resistance (R) is increased, the current (I) decreases and vice versa.
The equation represented by this law is:
V = IR or I = V/R or R = V/I
Likewise, the when the resistance is increased, the voltage increases and vice versa.
Therefore;
- Current (I) is directly proportional to the Voltage (V)
- Current (I) is inversely proportional to the Resistance (R)
- Voltage (V) is directly proportional to the Resistance (R)
Write a paragraph about getting to Mars using the dot points
1- what is a machine?
2- what do we mean my "energy"
3- what are fuels?
4-how do we measure energetic change?
5- what is efficiency?
6- what kind of machines are theres
A rubber ball thrown at a speed of 5 m/s hit a flat wall and
returned to the thrower at a speed of 5 m/s. Which
statement correctly describes the momentum of the rubber
ball?
Answer:
See the explanion below
Explanation:
Linear momentum is defined as the product of mass by velocity and can be calculated by the following equation.
[tex]P =m*v[/tex]
where:
P = momentum [kg*m/s]
m = mass [kg]
v = velocity [m/s]
When the ball hits the wall it receives a force for a very short time, this time and force value is known as momentum and can be calculated by the following expression.
[tex]-(m_{1}*v_{1}) + (F*t)=(m_{1}*v_{2})[/tex]
where:
m₁ = mass of the ball [kg]
v₁ = 5 [m/s]
v₂ = 5 [m/s]
v₁ = v₂
[tex]F*t = Imp[/tex]
[tex]Imp = (m_{1}*v_{1})+ (m_{1}*v_{2})\\Imp = 2*m*v_{1}[/tex]
It can be said that the impulse is equal to 2 times the speed of throwing by the mass.
pls help !!!!!!!!!!!!!!!!!!!!!!!!!!!!
Answer:
B. Identifying the types of data to be gathered
Explanation:
Identifying the types of data to be gathered is one of the part of designing a set of experimental procedure.
An experimental procedure is a methodical process that must be followed in order to attain the goal of the experiment.
As with most experiments, data is collected for further analysis and interpretation. The choice of way of collecting data and the type of data to be collected is very important when designing an experiment.An object has a tangential velocity of 23 m/s as it moves around a circular track with a
radius of 20 meters. What is the object's acceleration
Answer:
26.5m/s²
Explanation:
Given parameters:
Tangential velocity of the object = 23m/s
Radius of track = 20m
Unknown:
Acceleration = ?
Solution:
The acceleration of the body is its centripetal acceleration. It is given by;
a = [tex]\frac{v^{2} }{r}[/tex]
v is the tangential velocity
r is the
a = [tex]\frac{23^{2} }{20}[/tex] = 26.5m/s²
Choose the answer that is not a fossil.
a. dinosaur footprints preserved in mud turned to rock
b. a 400 million year old fish preserved in rock
c. a cow skeleton in the desert
d. a petrified t-rex is found in Montana
Answer:
C. a cow skeleton in the dessert.
Explanation:
i had this question and this is how i thought it through. fossils are usually referred to as extinct animal remains. a cow is not a extinct animal and it doesn't live in the dessert so that would make it a false answer. another reason would be that the rest of the answers make sense. for answer a. it is a trace fossil, b. is a preserved fossil, d. is a petrified fossil. so that leaves c.
hope that helps :)
50 POINTS!!!!!!!!!!
Eating peanut butter on whole wheat toast causes the blood glucose level to increase. When this happens, glucose from the blood is then absorbed by the muscles and liver. Which feedback mechanism is used to regulate blood glucose?
OA) a positive feedback loop because the blood glucose level was returned to the set point, not amplified
OB) a negative feedback loop because the blood glucose level was returned to the set point, not amplified
OC)a negative feedback loop because the blood glucose level was amplified, not returned
OD) to the set point a positive feedback loop because the blood glucose level was amplified, not returned to the set point
Answer: if i was doing this i would have chosen C
Explanation:
A runner completes a 400 meter race in 2.5 minutes. What is the runner's average speed?
Answer: I believe it’s 160 meters per minute. Hope this helps. Good luck :)
Explanation:
a computer simulation is an example of what?
a hypothesis
a scientific law
a scientific theory
a model
A model can be a virtual OR physical representation of an object, movement, etc. A model is used to have a visual view of an item.
Hope this helps and please mark brainliest!
Put them in order to smallest to largest: centimeter, femtometer, kilometer, light year, meter, nanometer
A projectile is launched with an initial velocity of (40 m/s), at an angle of (30°) above
horizontal. What is the maximum height (ymax) reached by the projectile?
(Use g=10 m/s2).
Answer:
330.5 m
Explanation:
In this case, the object is launched horizontally at 30° with an initial velocity of 40 m/s .
The maximum height will be calculated as;
[tex]h=\frac{v^2_isin^2\alpha }{2g}[/tex]
where ∝ is the angle of launch = 30°
vi= initial launch velocity = 40 m/s
g= 10 m/s²
h= 40²*sin²40° / 2*10
h={1600*0.4132 }/ 20
h= 661.1/2 = 330.5 m
Out line two application of reflactive index
Explanation:
In addition, they are used as light emitting diodes, optical waveguides, optical filters, piezoelectric devices, multimeter sensors, electron-beam pumped lasers, spintronics, quantum computing, electrophotography and photo-catalysis.
Does anyone just ever question their gender. But you get scared out of wanting and feeling like the opposite gender.
Yeah it feels weird, it gives me goosebumps. Im a boy actually, but when I think my self as a girl it just cringes me. But I also wonder how would my life would change.
1. In this activity, you will be looking for a relationship between the mass of the cart and the acceleration of the cart.
Which variable do you need to keep constant during this experiment?
Mass of the cart
The fan force on the cart
The acceleration of the cart
Answer:
Mass of cart
Explanation:
A 12 volt battery is connected to two resistors in series. The first resistor has a resitance value of 5 Ohms and the current through the circuit is 1.5 Amps. What is the value of the second resistor?
a
9 Ohms
b
1.5 Ohms
c
5 Ohms
d
3 Ohms
Answer:
D) 3 ohms
Explanation:
According to one law
V = IR
Where V = voltage or potential difference
I =current
R =resistance
Making R the subject
R= V/I
R= 12/1.5
R=8 ohms
Sum of resistance of resistors in series equals the total resistance
R(total) = R1+ R2
8 =5+ R2
8-5=R2
3=R2
"1. Which properties make a metal a good material to use for electrical wires? (1 poi
Answer:
Malleability
Conductivity
Ductility
Hope this is correct and helpful
HAVE A GOOD DAY!
Kara is pushing a shopping cart to the right. The gravitational force is acting ________.
A.) upward
B.) downward
C.) to the left
D.) to the right
Answer: Gravitational force should be downwards as gravity pulls downwards.
Explanation: Dont quote me on that
What do the arrows at point 3 indicate?
Cool air is above water.
Warm air is above land.
Warm air is cooling quickly.
Cool air is warming quickly.
Answer:
Cool air above water
Explanation:
Bc i took the test
Answer:
ANSWER IS A. COOL AIR ABOVE WATER :)
Explanation:
BRAINLIEST PLEASE!
5. A pendulum is 0.25 m long. What is the frequency of its oscillations?
Answer:
I would say your answer is: The frequency of oscillations is 1 HZ { 1 cycle per second}.
The frequency of pendulum oscillations which is 0.25 m long is 1 HZ (1 cycle per second).
What is frequency?The quantity of waves leaving a spot in relation to time is known as its frequency. Hertz units are used to measure frequency. Humans with typical hearing abilities can hear frequencies between 20 Hz and 20 kHz. The frequency is defined mathematically as the time period divided by the factor of one. The number of rotations or vibrations that a body in periodic motion makes in a given amount of time.
A moving disturbance is referred to as a wave. The waves that must pass through a medium like air or water are referred to as mechanical waves. Other forms of waves, such as electromagnetic waves, can pass through both mediums and a vacuum.
Given:
The length of the pendulum, l = 0.25 m,
Calculate the frequency by following the formula:
f = [tex]1/T[/tex] =ω / 2[tex]\pi[/tex]
Therefore, the frequency of pendulum oscillations which is 0.25 m long is 1 HZ (1 cycle per second).
To know more about frequency:
https://brainly.com/question/14316711
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A ball of mass of 0.5kg is dropped from a height of 2m.
Assuming that all of the GPE is transferred to KE, what
will be the velocity of the ball when it hits the ground?
Answer:
6.3m/s
Explanation:
Given parameters:
Mass of the ball = 0.5kg
Height = 2m
Unknown:
Velocity when the ball hits the ground = ?
Solution:
Since the potential energy is transformed into kinetic energy;
P.E = K.E
mgh = [tex]\frac{1}{2}[/tex] m v²
cancelling m;
gh = [tex]\frac{1}{2}[/tex] v²
v² = 2gh
v = √2gh
Insert the parameters and solve;
v = √2gh = √ 2 x 9.8 x 2 = 6.3m/s
A bicyclist, traveling with a constant speed, covers 43.0m in 7.90s. Determine all unknowns.
Answer:
5.4m/s
Explanation:
Given parameters:
Distance = 43m
Time = 7.9s
Unknown:
Speed = ?
Solution:
Speed is mathematically expressed as;
Speed = [tex]\frac{distance}{time }[/tex]
Insert the parameters and solve;
Speed = [tex]\frac{43}{7.9}[/tex] = 5.4m/s
Should Fast Food Companies be held responsible for the obesity problem in the US or any country? Why?
HURRRRRRRYYYYYYYYY
Why can the volume of a sample of plasma change when the substance is moved from one container to another?
A. Plasma is made of charged ions and electrons, so they interact differently in different places.
B. Plasma can have lots of space between its particles, so it naturally expands and compresses.
C. Plasma is made of neutral atoms that can split into separate ions and electrons when placed in a new container.
D. Plasma can change between a rigid shape and a free-moving form, so it will have different volumes in different containers.
The volume of a sample of plasma change when the substance is moved from one container to another because plasma can have lots of space between its particles, so it naturally expands and compresses.
PlasmaPlasma is one of the four states of matter.Plasma refers to a gas that exists as ions or in the ionized state.When sufficient energy has been supplied to the gas, the electrons of the gas have enough energy to escape from their atoms or molecules and the atoms then exist as ions.
Plasma contains ions and electrons that are free to.move around easily.
Matter in the plasma state do not have constant volume or shape, rather it has variable volume and shape. Plasma is the most common form of visible matter in the universe.
Examples of matter that exist in the plasma state include lightning, sparks, the sun, etc
Therefore, the volume of a sample of plasma change when the substance is moved from one container to another because plasma can have lots of space between its particles, so it naturally expands and compresses.
Learn more about plasma and states of matter at: https://brainly.com/question/11175823
Answer: Plasma can have lots of space between its particles, so it naturally expands and compresses.
Explanation:
Right on edge
Define the term sorting
Answer: arrange systematically in groups; separate according to type, class, etc.
Explanation:
i hooked this up btw
Which statement describes how Earth compares to the moon? Earth has more inertia than the moon. The moon has more gravitational pull than Earth. The moon rotates at a constant speed while Earth’s speed varies. Earth and the moon will not change their motion when acted on by a force.
Answer
Earth has more inertia than the moon.
Answer:
A:Earth has more inertia than the moon.
Explanation:
proof:
Thank you for the answer the person on top :)