Question 1 of 10

What happens in terms of energy when a moving car hits a parked car, causing the parked car to move?

adelina 88 [10]

<span>that for every action there is an equal and opposite reaction. This means that forces happen in pairs for every interaction there is an object that causes the force and an object that is affected by it. So newtons 3rd law I would say.</span>

7 0

4 years ago

What is the acceleration of a car that goes from 40km/hr to 80km/hr in 2s?

tresset_1 [31]

Acceleration = v2 - v1 / t
a = 80 - 40 / 2
a = 40 / 2
a = 20 m/s²

In short, Your Answer would be 20 m/s²

Hope this helps!

5 0

3 years ago

When a ball is thrown in the air, the potential energy gained must come from the kinetic energy given by the person throwing the

vodka [1.7K]

I believe it is C. remain the same. If i am wrong i sincerely apologize.

3 0

3 years ago

Read 2 more answers

A record turntable is rotating at 33 rev/min. A watermelon seed is on the turntable 2.3 cm from the axis of rotation. (a) Calcul

VLD [36.1K]

Answer:

a) $a_{r} = 0.275\,\frac{m}{s^{2}}$ , b) $\mu_{s} = 0.028$ , c) $\mu_{s} = 0.036$

Explanation:

a) The linear acceleration of the watermelon seed is:

$a_{r} = \omega^{2}\cdot r$

$a_{r} = \left[\left(33\,\frac{rev}{min} \right)\cdot \left(2\pi\,\frac{rad}{rev} \right)\cdot \left(\frac{1}{60}\,\frac{min}{s} \right)\right]^{2}\cdot (0.023\,m)$

$a_{r} = 0.275\,\frac{m}{s^{2}}$

b) The watermelon seed is experimenting a centrifugal acceleration. The coefficient of static friction between the seed and the turntable is calculated by the Newton's Laws:

$\Sigma F = \mu_{s}\cdot m\cdot g = m\cdot a$