A train travels 80 kilometers in 2 hours, and then 79 kilometers in 4 hours. What is its average speed?

How does the law of conservation of energy apply to machinesBased on the law of conservation of energy, how can we reasonably improve a machine's ability to do work?

The force on a straight current-carrying wire in a magnetic field is proportional to the current in the wire, the strength of the field, and the of the wire. a) trueb) false

Difference between uniform circular motion and non uniform circular motion

How does the magnetic force vary with distance?

A man pushes a cart with force of 120-N at an angle of 50 degrees with the ground. If he walks a horizontal displacement of 20-m going to cashier who's much work is done!

Why do atoms move at different speeds depending on wether they are liquids or solids

What are the arrangement of resistors in series

A cell provides 6 V to an LDR. The current through this LDR is measured and is found to be 3 A. What is the resistance of the LDR?

A car travels along eastward with a constant velocity. the magnitude of the acceleration of the car is

What is the weight of a 65 kg astronaut on mars?