What is the efficiency of a machine that has work input of 40 joules and work output of 35 joules

The pressure inside a bottle of champagne is 5.99 atm higher than the air pressure outside. The neck of the bottle has an inner radius of 1.46 cm. What is the frictional force on the cork due to the neck of the bottle

A rocket accelerates by burning its onboard fuel, so its mass decreases with time. Suppose the initial mass of the rocket at liftoff (including its fuel) is m, the fuel is consumed at rate r, and the exhaust gases are ejected with constant velocity

Which of the following statements about polarized materials is NOT true? Two polarized filters that have polarizing axes parallel to each other will block all the light passing through them.

The femur has cross-sectional area of 0.0006 m^2. At what load would it break (given to you the compressive strength of femur is 180000000 N/m^2

Alex needs to determine the power dissipated in a resistor. She measures the current through the resistor to be I=10.0±0.6 A, and its resistance to be R=45.0±2.0 Ω.

What are two ways that convention currents in the ocean distribute the suns energy?

An astronaut on a strange planet has a mass of 80 kg and a weight of 240 n. what is the value of the acceleration due to gravity on this planet?

A 165g arrow is shot straight up into the air with a speed of 16m/s reaches a maximum height of 12.0612m. a. Find the initial kinetic energy. The acceleration of gravity is 9.8m/s^2. b. Find the potential energy at its highest position. c.

The amount of force needed to keep a 0.1kg basketball moving at a constant speed of 6 m/s on frictionless ice is ___ N

What three forms of kinetic energy can a polyatomic molecule have?