A train travels 90 kilometers in 1 hours, and then 60 kilometers in 3 hours. What is its average speed

What is the total energy required to change 15 g of ice at - 20°C to water at 100°C?

What means of motion

If a person weighs 90 N on Earth, and the gravitational acceleration due to the Moon's gravity is 1.62 m/s2, how much would the person weigh on the Moon?

Which of the following is a physical property of wood

While examining a coolant leak from a weep hole on the side of a Detroit S60 engine, Technician A says the leak is caused by a leaking liner O-ring. Technician B says the coolant leak is due to cavitation of the cylinder block. Who is correct?

Describe a beach that was near stormy seas and powerful waves

We all depend on electricity. Most electricity is created by electromagnetic generators at large power plants and distributed through an electric grid.

A rock with mass m = 4.00 kg falls from rest in a viscous medium. The rock is acted on by a net constant downward force of F = 17.

On arrival at a vehicle collision, you observe a small fire in the engine compartment. A bystander is attempting to smother the fire with a jacket as you approach with an A-B-C extinguisher from your ambulance.

Gertrude writes a short story in which the main character must enter a nuclear-powered spaceship's engine room that has lost its shielding in order to prevent the engine from flooding the rest of the ship with radiation.