At what speed does a 1400 compact car have the same kinetic energy as a 20000 truck going 25?

Express your answer using two significant figures.

A machine has a mechanical advantage of 4.5. What force is put out by the machine if the force applied to the machine is 800 N?

The most abundant element in the universe is:

Which colors will eject electrons when they strike sodium, which has a frequency threshold of 5.7 * 1014 Hz?

You have two solid steel spheres; sphere 2 has twice the radius of sphere 1. what is the ratio of the moments of inertia, i2 : i1?

Which of the following is true about organizing items and information during scientific investigations?

A book falls of the table and hits the floor. Is work done? Why?

A person of 83 kg is in an elevator. If the elevator is moving at a speed of 5 m/s, what's the person's kinetic energy? Keep 4 significant figures a 1,004 J b 1,038 c 1,280 J d 980 J e 1,435 J

What two equations can be used to determine the speed of a wave

Which force has an infinite range and is always attractive?

A ramp with a mechanical advantage of 8 lifts objects to a height of 1.5 meters how long is the ramp