What did Galileo learn about the Sun from his observations of sunspots ?

What term is used to describe the collection that includes gamma rays, x-rays, ultraviolet light, visible light, infrared radiation, microwaves, and radio waves ?

A car and a truck are heading directly toward one another on a straight and narrow street, but they avoid a head-on collision by simultaneously applying their brakes at $t=0$. The resulting velocity-versus-time . What is the separation between the car and the truck when they have come to rest, given that at $t=0$ the car is at $x=15 \mathrm{~m}$ and the truck is at $x=-35 \mathrm{~m}$ ? (Note that this information determines which line in the graph corresponds to which vehicle.)

You are driving through town at 16 m/s when suddenly a car backs out of a driveway in front of you. You apply the brakes and begin decelerating at 3.2 m/s$^{2}$. (a) How much time does it take you to stop? (b) After braking for half the time found in part (a), is your speed 8.0 m/s, greater than 8.0 m/s, or less than 8.0 m/s? (c) Support your answer with a calculation.

Rocket blasts off and moves straight upward from the launch pad with constant acceleration. After $3.0 \mathrm{~s}$ the rocket is at a height of $77 \mathrm{~m}$. What are the magnitude and direction of the rocket's acceleration?

You are driving through town at $16 \mathrm{~m} / \mathrm{s}$ when suddenly a car backs out of a driveway in front of you. You apply the brakes and begin decelerating at $3.2 \mathrm{~m} / \mathrm{s}^2$. How much time does it take to stop?

Landing with a speed of $71.4 \mathrm{~m} / \mathrm{s}$, and traveling due south, a jet comes to rest in $949 \mathrm{~m}$. Assuming the jet slows with constant acceleration, find the magnitude and direction of its acceleration.

What mineral does Sample D contain that gives it a pinkish color?

Sample H is a microcrystalline rock composed of calcite, and Sample O is a microcrystalline rock composed of quartz. What test(s) could you use to figure out which is which?

What are the names of the two places on Earth that are farthest from the equator to the north and to the south?

Describe the relationship between a particular latitude and the angle of Polaris above the horizon at that latitude .

Are adjacent meridians farthest apart at the equator or at the poles?

Find the area of the surface generated when the given curve is revolved about the x-axis.

$$y = \frac { 1 } { 4 } \left( e ^ { 2 x } + e ^ { - 2 x } \right)$$

on [-2, 2]

The solid lies between planes perpendicular to the y-axis at y=0 and y=2. The cross-sections perpendicular to the $y$-axis are circular disks with diameters running from the $y$-axis to the parabola $x=\sqrt{5} y^2$