Two identical freight cars roll without friction towards each other on a level track. one car rolls 2 m/s the other 1 m/s. after the cars collide they couple and roll together with a speed of

A 3 kg bowling ball is thrown onto a mattress. If it takes 0.3 seconds to stop the ball using a force of 24 N, what was the initial velocity of the bowling ball when it first touched the mattress?

What overall charge must a compound have

How do you find the average speed of an object?

A 6.7 kg rock is rolling 10.0 m/s. Find its kinetic energy

Light of intensity 2.00 W/m2 passes through the pupil of one of your eyes and eventually falls on your retina. The radius of the pupil is controlled by the iris. In a human eye, the radius of the pupil can vary from about 1.0 mm to about 3.5 mm.

If a car traveling at 60 km/h will skid 20m when its brakes lock, how far will it skid if it's traveling at 120 km/h when it's brakes lock?

The formula for sodium sulfide is na2s what does it mean

On a sunny day does a bird or an aeroplane flying high in the sky casts its shadow on the ground

A cage containing male mosquitoes has a small earphone placed on top, through which the sound of a female mosquito is played. all the males immediately fly to the earphone and go through all of the steps of copulation.

The direction of the force on a current-carrying wire in a magnetic field is