Physics Answers

2. A car travels form rest and has a constant acceleration of 3 ft/s^2. Find the average velocity during the first 10s of motion.

A machine part is undergoing SHM with a frequency of 5.00 Hz and amplitude 1.80 cm.

How long does it take the part to go from x=0 to x=-1.80 cm

A train with a mass of 500 metric tons travels at constant velocity on a horizontal line and unleashes its last compartment which is with a mass of 20 metric tons. If the engine is turned off after moving another 240 m, what would be the distance between the last compartment and the train when it stops? Note that the force generated by the engine remains unchanged throughout the motion and the resistance force applied to each part is proportional to the mass.

A train with a mass of 500 metric tons travels at constant velocity on a horizontal line and unleashes its last compartment which is with a mass of 20 metric tons. If the engine is turned off after moving another 240 m, what would be the distance between the last compartment and the train when it stops? Note that the force generated by the engine remains unchanged throughout the motion and the resistance force applied to each part is proportional to the mass.

An improvised billiard ball is used in a local play where a 35 gram billiard ball resting in a corner is suddenly

hit by another 45 grams ball moving 0.5 m/s. After the collision, the 45 grams ball remains at rest while the

other ball moves away. Find the velocity of the ball moving away ?

Six and a half seconds later

te sneed

sound n ar

away was the lightning bolt? (Ignore the travel time for the flash

If the gravitational field strength at the top of Mount Everest is 9.772 N/kg, approximately how tall (in

feet) is the mountain?

Two stones are thrown vertically upward from the ground, one with three times the initial speed of the other. (a) If the faster stone takes 10 s to return on the ground, how long will it take the slower stone to return? (b) If the slower stone reaches a maximum height of H, how high (in terms of H) will the faster stone go? Assume the two stones are freely falling objects. 

A 4.0-g bullet leaves the muzzle of a rifle with a speed of 340 m/s. What force (assumed constant) is exerted on the bullet while it is traveling down the 0.75-m-long barrel of the rifle?

A 1450-kg

 car is traveling with an initial speed of 24.0 m/s.

Determine the car's speed after −1.90 ✕ 10⁵ J

 of net work is done on the car.

Question 5.2b:

A 11.8-kg

 box is sliding across a horizontal floor. It has an initial speed of 1.45 m/s

 and the only force acting on it is kinetic friction with magnitude f_k = 2.65 N.

Determine the distance the box will travel before coming to rest.