List the forces that are act on a hot-air balloon to ist keep it on the ground.

An airliner lands with a speed of 47.0 m/s. Each wheel of the plane has a radius of1.25 m and a moment of inertia of 110kgm2. Attouchdown the wheels begin to spin under the action of friction. Each wheel supports a weight of 1.

A CO molecule has an intrinsic dipole moment whose magnitude is 4 X 10^-31 C*m. If the separation between the atoms is 0.11 nm, what is the charge?

Between which of the following surfaces with the force of friction be smallest

A train travels due south at 20 m/s. It reverses its direction and travels due north at 20 m/s. What is the change in velocity of the train? 50 m/s, due south e50 m/s, due north 120 m/s, due south zero ms 40 m/s, due north

Is the answer D? A skydiver is accelerating downwards as he falls. Earth is pulling him down with a gravitational force of 600 N downward, while he pulls the Earth upward with a force of 600 N.

A 1,120 kg car is travelling with a speed of 40 m/s. Find its energy.

3. Calculate the amount of current through a 45-watt light bulb that is connected to a 120-volt circuit in your home.

Are oranges called oranges because oranges are orange, or is orange called orange because oranges are orange?

An object at rest has no net force acting on it. a. True b. False

A baseball has mass 0.145 kg. (a) If the velocity of a pitched ball has a magnitude of and the batted ball's velocity is in the opposite direction, find the magnitude of the change in momentum of the ball and of the impulse applied to it by the bat.