Physics Answers

The gravitational attraction between a 20 kg cannonball and a marble separated center-to-center by 30 cm is 1.48 x 10 ^ -10 N. Compute the mass of the marble.

Car a is traveling east at 20m/s and car b is traveling east at 30m/s, if car b is 200m behind car a how long will it take for car b to catch car a?

A plane flies east at 400m/s and them accelerates west at 6.0m/s^2 for 5 seconds. Determine the distance traveled during the 5 seconds.

The refractive index of glass is 1.5, if the velocity of light in air is 3×10^8 m/s, then calculate the velocity of light when it travels through glass

To test a bicycle helmet with a mass of 0.20 kg, it is placed at a height of 1.4 m from the ground and dropped onto a force detector placed on the ground. What is the speed of the bicycle helmet just before it hits the force detector on the ground?

To test a 0.80 kg ski helmet, it is placed at a certain height from the ground and dropped onto a force detector placed on the ground. The pulse is 0.39 N • s for an interval of 0.050 s when it hits the force detector. What is the force recorded by the force detector?

A small bomb explodes in 2 pieces. A first piece of 1.20 kg moves at 18.0 m / s to the left. What is the speed in m / s of the second piece with a mass of 1.60 kg?

A loaded wagon, the mass of which is 6000 kg, rolls to the right at

2.0 m / s when it collides with an empty freight car, weighing 3000 kg, rolling to the left on the same track at 3.0 m / s. If the cars remain tied together after the collision, what is the speed and direction of the pair of cars after the collision?

A 2100 kg pickup truck collided with a stopped car, which had a mass of 1200 kg. The two vehicles sink into each other and travel together at a speed of 4.50 m / s. The initial speed of the van is ____ m / s.

A 3.0 kg black ball travels to the right at a speed of 1.7 m / s and collides with a stationary 6.0 kg red ball. After the collision, the black ball bounces and retraces its steps at a speed of 0.50 m / s. What is the speed in m / s of the red ball after the collision?