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Questions in physics

[Done] What are some examples of helpful and unhelpful frictions?

[Done] If you push a chair across the floor at a constant velocity, how does the force of friction compare with the force you exert?

[Done] A car rounds a curve while maintaining a constant speed. Is there a net force on the car as it rounds the curve? A. It depends on the sharpness of the curve and speed of the car. B. No - its speed is constant C. Yes

[Done] The model of the universe that suggests that the sun is the center of the universe was first introduced by: A. Copernicus B. Brahe C. Ptolemy D. Kepler

[Done] How does the distance between Earth and the Sun compare to the distances between Earth and nearby stars and galaxies?

[Done] Two trunks sit side by side on the floor. The large trunk (52 kg) is to the left of the smaller trunk (34 kg). A person pushes on the larger trunk horizontally toward the right. The coefficient of static friction between the trunks and the floor is 0.35. a) Determine the magnitude of the maximum force the person can exert without moving either trunk. b) Calculate the force the larger trunk exerts on the smaller trunk. c) Would either answer change if the person pushed in the opposite direction on the smaller trunk? Explain your reasoning.

[Done] A car \((m = 1700 \, \text{kg})\) is parked on a road that rises 15 degrees above the horizontal. What are the magnitudes of: a. The normal force b. The static frictional force that the ground exerts on the tires?

[Done] What weight of water is displaced by a 100-ton floating ship? (Note: The answer must be in SI units.)

[Done] What metric unit would you use to estimate the actual distance between Boston and New York?

[Done] A ball is pushed with a force of 13.5 N and accelerates at 6.5 m/s² to the right. What is the mass of the ball?