Check out some similar questions!

shqiperona · Nov 16, 2011, 01:33 PM

1. A 20,000 kg loaded railroad car is traveling alone on a level, frictionless track with a speed of 20 m/sec. An additional weight of 5,000 kg falls down onto the car. What will be the speed of the car now?

shqiperona · Nov 16, 2011, 01:34 PM

2) A 90 kg fullback is traveling 5.0 m/s and is stopped by a tackler in 10 s. Calculate
a) the original momentum of the fullback
b) the impulse imparted to the tackler
c)the average force exerted on the tackler

shqiperona · Nov 16, 2011, 01:35 PM

A baseball is hit off the edge of a cliff horizontally at speed of 30 m/s. It takes the ball 3 seconds to reach the ground, with no air resistance.
A) How far from the cliff wall does the ball land?
B) How high is the cliff wall?

1. A horse exerts 1200N force to pull a 600 kg load 80 m. How much work did the horse do?

2. A 100 kg rocket has 2,000,000 joules of kinetic energy. How fast is it moving?

3. How much work is required to stop a 1000 kg car traveling at 10 m/s?

4. A 10 kg monkey swings from one branch to another 3 m higher, What is it's change in potential energy?

Curlyben · Nov 16, 2011, 02:22 PM

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Unknown008 · Nov 17, 2011, 05:33 AM

1. Use P = Fv

2. (a) p = mv
(b) $I = \Delta p$
(c) $F = \frac{dp}{dt}$

3. (a) s = ut
(b) $s = ut + \frac12 at^2$

4. W = Fd

5. $E_k = \frac12 mv^2$

6. $E_k = \frac12 mv^2$

7. $\Delta E_p = mgh_f - mgh_i$