Light from the Sun takes approximately $8.3 \mathrm{~min}$ to reach the Earth. During this time interval the Earth has continued to rotate on its axis. How far is the actual direction of the Sun from its image in the sky?

Apply The average speed of the coronal solar wind is $450 \mathrm{~km} / \mathrm{s}$. How long does it take a particle in such a wind to reach Earth? (Assume that the distance from Earth to the sun is $150,000,000 \mathrm{~km}$.)

What do we call the gravitational force between the Earth and your body.

Compare the fuel required for a trip from Earth to Moon with that required for the return trip.

(a) Measure the radius (in mm) of the circle representing the Earth on the previous page: _____________________________________________________________________________

(b) Measure the radius of the inner shape you mapped (in mm): _____________________________________________________________________________

(c) Given that the radius of the Earth is 6371 km, at what depth (in km) does the structure appear to be?_____________________________________________________________________________

An electromagnet consists of 200 loops and has a length of $10.0 \mathrm{~cm}$ and a cross-sectional area of $5.00 \mathrm{~cm}^2$. Find the resonant frequency of this electromagnet when it is attached to the Earth (treat the Earth as a spherical capacitor).

An electromagnet consists of 200 loops and has a length of $10.0 \mathrm{~cm}$ and a cross-sectional area of $5.00 \mathrm{~cm}^2$. Find the resonant frequency of this electromagnet when it is attached to the Earth (treat the Earth as a spherical capacitor).

In this exercise, there are about 4.8 $\times$ 10$^{19}$ ft$^3$ of water on Earth. One cubic foot of water contains about 9.47 $\times$ 10$^{26}$ water molecules. About how many water molecules are there on Earth?

A solar eclipse occurs when the Moon passes between the Earth and the Sun. Use a diagram to show why some areas of the Earth see a total eclipse, other areas see a partial eclipse, and most areas see no eclipse

Use the following values, where needed: radius of the Earth = 4000 mi = 6440 km, 1 year (Earth year) = 365 days (Earth days), 1 AU =

$$92.9 \times 10 ^ { 6 }$$

mi=

$$150 \times 10 ^ { 6 } \mathrm { km }$$

. The dwarf planet Pluto has eccentricity e = 0.249 and semimajor axis a = 39.5 AU. Find the perihelion and aphelion distances.

A $2150 \mathrm{~kg}$ satellite used in a cellular telephone network is in a circular orbit at a height of $780 \mathrm{~km}$ above the surface of the earth What is the gravitational force on the satellite? What fraction of this force of the satellite's weight is at the surface of the earth?

The same hemisphere of the moon always faces Earth. Thus, the motion of the moon about Earth for a given time interval can be modeled by a rotation. The center of the rotation is the center of Earth. The angle of rotation is determined by the time interval, given that one journey of the moon around Earth takes about $27 \frac{1}{3}$ days.

What rotation is modeled by the motion of the moon?

A. a circle rotating about its center

B. a circle rotating about a point

C. 2 circles rotating around each other

D. a circle rotating around a circle

Light from the Sun takes approximately 8 minutes to reach Earth. If light travels at a speed of $3 \times 10^{8}$ m/s, calculate to three significant figures (s.f.) the distance from the Sun to the Earth.

John's mass is $65.0 \mathrm{~kg}$ on the earth. Express his U.S. (a) mass and (b) weight $40 \overline{0} 0\ \mathrm{mi}$ above the surface of the earth, where $g=7.85 \mathrm{ft} / \mathrm{s}^2$ ?