What is the requirement that a GPS device needs information from at least three GPS satellites and why one "very good" satellite cannot do the task?

Pretend you fall into a hole bored completely through the Earth. Discounting friction and rotational effects, rank from greatest to least positions A, B, C, and D for your a. speed. b. acceleration toward Earth's center.

In the hydraulic machine shown, you observe that when the small piston is pushed down $10 \mathrm{~cm}$, the large piston is raised $1 \mathrm{~cm}$. If the small piston is pushed down with a force of $100 \mathrm{~N}$, what is the most weight that the large piston can support?

Why is centrifugal force in a rotating frame called a "fictitious force"?

Rank the microtidal forces on your own body, from greatest to least, produced by the a. Moon. b. Earth. c. Sun.

What force acts on a satellite that is above Earth’s atmosphere?

Why doesn't the force of gravity change the speed of a bowling ball as it rolls along a bowling lane?

Suppose you are standing on a bathroom scale next to a sink. How does the reading on the scale change if you push down on the sink?

Suppose you jounce up and down while weighing yourself on your bathroom scale. The weight reading likewise "jounces up and down." Does this mean that the force of gravity, mg, varies when you jounce?

A satellite can orbit at 5 km above the moon, but not at 5 km above Earth. Why?

Explain why Hawaii is the most efficient launching site in the United States for nonpolar satellites. In your discussion include a look at the spinning Earth from above either pole and compare it to a rotating turntable.

Satellites are normally sent into orbit by firing them in an easterly direction, the direction in which Earth spins. What is the advantage of this?

Consider three axes of rotation for a pencil: along the lead, at right angles to the lead at the middle, and at right angles to the lead at one end. Rate the rotational inertias about each axis from smallest to largest.

In the hydraulic machine shown, it is observed that, when the small piston is pushed down $10 \mathrm{~cm}$, the large piston is raised $1 \mathrm{~cm}$. If the small piston is pushed down with a force of $100 \mathrm{~N}$, show that the large piston is capable of exerting $1000 \mathrm{~N}$ of force.