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4 years ago

What does mean kinematics

Physics

2 answers:

kap26 [50]4 years ago

7 0

Answer:

It is the study of trajectory of paticles.

Explanation:

Travka [436]4 years ago

3 0

Answer:

the branch of mechanics concerned with the motion of objects without reference to the forces which cause the motion.

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If object A has more mass than object B, what will object A need to accelerate at the same rate as object B?

Leni [432]

Answer:

More force

Explanation:

Object A has more mass than object B

For object A to accelerate at the same rate as object B, it will need more force.

According to Newton's second law of motion "the net force on a body is the product of its mass and acceleration".

Net force = mass x acceleration

Now, if a body has more mass and needs to accelerate at the same rate as another one with a lower mass, the force on it must be increased.

3 0

3 years ago

Ken wants to jump and have some fun too! Barbie loans Ken her bungee cord. Is this a good idea? Explain with evidence and reason

skelet666 [1.2K]

Answer:

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4 0

3 years ago

Read 2 more answers

Which is the best predictor of the radioactive nature of an isotope?

azamat

The best predictor of the radioactive nature of an isotope is the neutron-to-proton ratio of the atom. Isotopes are atoms of elements having the same number of protons however they don't have the same number of neutrons. Each isotope of an element will have different values of mass number.

3 0

3 years ago

Read 2 more answers

If you shout into the grand canyon, your voice travels at the speed of sound (340 m/s) to the bottom of the canyon and back, and

Nostrana [21]

Given:
The speed of sound is 340 m/s
Time for the echo is 5.2 s.

Let h = the depth of the canyon.

Because the sound of your voice travels to the bottom of the canyon and back to your ear, the total distance traveled is 2h.

By definition,
distance = velocity * time.
Therefore
2h = (340 m/s)*(5.2 s) = 1768 m
h = 884 m

Answer: The depth is 884 m.

4 0

3 years ago

A person driving her car at 43 km/h approaches an intersection just as the traffic light turns yellow. She knows that the yellow

siniylev [52]

Answer:

If she hits the brakes, she will travel 13m before stopping. If she hits the gas, she will travel 28 before the light turns red. She should try to stop

Explanation:

To know how far she will travel before stopping, we need to use a kinematic formula which initial final velocity (Vf), initial velocity (V0), acceleration (a) and distance traveled(x):

$V_{f}^{2}=V_{0} ^{2} +2ax$

The moment in which she stops is when the final velocity equals zero. In this case, initial velocity is 43km/h=12m/s, and its maximum deceleration is -5.4m/s^2. Plugging in these values and solving for x:

$0^2=(12m/s)^2+2(-5.4m/s)x\\x=13m$

She will travel 13m before stopping

If she hits the gas, we need another kinematic formula, which relates distance traveled, initial speed, time (t) and acceleration.

$x=v_{0}t+0.5a*t^2$

If we know her car can accelerate from 43km/h=12m/s to 70km/h=19m/s in 8.1 s, we can know its acceleration:

$a=\frac{19m/s-12m/s}{8.1s}=0.86m/s^2$

In this case, the time before the light turns red is 2.0s. Plugging in all those values:

$x=12m/s*2s+0.5*0.86m/s^2*(2s)^2=28m$

If she hits the gas, she will travel 28m before the light turns red. She won't even reach the intersection, so she would try to stop.

5 0

3 years ago