Physics questions and answers in May 2021

In the railroad freight yard, an empty freight car of mass m rolls along a straight level track at 1.30 m/s and collides with an initially stationary, fully loaded boxcar of mass 5.30 m . The t...

In the railroad freight yard, an empty freight car of mass m rolls along a straight level track at 1.30 m/s and collides with an initially stationary, fully loaded boxcar of mass 5.30 m . The t...

For a system of three particles moving along a line, an observer in a laboratory measures the following masses and velocities. What is the velocity of the CM of the system? Enter a positive value if t...

A baseball player pitches a fastball toward home plate at a speed of 41.0 m/s. The batter swings, connects with the ball of mass 165 g, and hits it so that the ball leaves the bat with a speed of 37.0...

A baseball player pitches a fastball toward home plate at a speed of 41.0 m/s. The batter swings, connects with the ball of mass 165 g, and hits it so that the ball leaves the bat with a speed of 37.0...

An object of mass 4.40 kg is projected into the air at a 55.0° angle. It hits the ground 3.40 s later. Set "up" to be the positive y -direction. What is the y-component of the object's change in mo...