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Questions in physics

[Open]A horizontal force of 90.0 N is required to push a 75 kg object along a horizontal surface at a constant speed. What is the magnitude of the force of friction? Please show your work.

[Open]What happens to the mass of a metal ball if it's heated?

[Open]Why do gases have low densities?

[Open]Find the mass of a 100 N dog.

[Open]One object has a mass of 2 kg and was lifted at a speed of 2 m/s over a distance of 10 m. The other object has a mass of 4 kg and was lifted at a speed of 3 m/s over a distance of 10 m. Which object has more potential energy, given that gravity is [tex]9.8 \, \text{m/s}^2[/tex]?

[Open]A 3-kilogram ball is accelerated from rest to a speed of 10 m/s. What is the ball's change in momentum?

[Open]An archer shoots an arrow into a target 53 meters north of his position. What do you call the magnitude of the arrow's displacement? How large is that magnitude?

[Open]What is the formula for calculating the force and acceleration of an object?

[Open]A car with a mass of 1330 kg is traveling at 28 m/s. The driver applies the brakes to bring the car to rest over a distance of 79 m. Calculate the force acting on the car.

[Open]Why would a flat sheet of paper and a wad of paper with the same mass not fall through the air at the same rate?