Q: A passenger in a moving bus with no windows notices that a
A passenger in a moving bus with no windows notices that a ball that has been at rest in the aisle suddenly starts to move toward the rear of the bus. Think of two possible explanations, and devise a...
See AnswerQ: A woman in an elevator lets go of her briefcase, but
A woman in an elevator lets go of her briefcase, but it does not fall to the floor. How is the elevator moving?
See AnswerQ: Some people say that the “force of inertia” (or
Some people say that the “force of inertia” (or “force of momentum”) throws the passengers forward when a car brakes sharply. What is wrong with this explanation?
See AnswerQ: A ball thrown straight up has zero velocity at its highest point
A ball thrown straight up has zero velocity at its highest point. Is the ball in equilibrium at this point? Why or why not?
See AnswerQ: Does a car’s kinetic energy change more when the car speeds up
Does a car’s kinetic energy change more when the car speeds up from 10 to 15 m/s or from 15 to 20 m/s? Explain.
See AnswerQ: Suppose you chose the fundamental physical quantities to be force, length
Suppose you chose the fundamental physical quantities to be force, length, and time instead of mass, length, and time. What would be the units of mass in terms of those fundamental quantities?
See AnswerQ: When you stand with bare feet in a wet bathtub, the
When you stand with bare feet in a wet bathtub, the grip feels fairly secure, and yet a catastrophic slip is quite possible. Explain this in terms of the two coefficients of friction.
See AnswerQ: A net force acts on an object and accelerates it from rest
A net force acts on an object and accelerates it from rest to a speed v1. In doing so, the force does an amount of work W1. By what factor must the work done on the object be increased to produce thre...
See AnswerQ: A truck speeding down the highway has a lot of kinetic energy
A truck speeding down the highway has a lot of kinetic energy relative to a stopped state trooper but no kinetic energy relative to the truck driver. In these two frames of reference, is the same amou...
See AnswerQ: If there is a net force on a particle in uniform circular
If there is a net force on a particle in uniform circular motion, why doesn’t the particle’s speed change?
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