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# Planets

### Gravitation: Force, motion of satellite, Kepler's law

1. A 8754-kg satellite is orbiting planet Y at an altitude of 1.69x10^6 meters above its surface and with an orbital period of 15.2 hours. If the planet has a mass of 8.19x10^24 kg, then determine the radius of planet Y. 2. Suppose the earth had another moon which was 1.69 times as far from the center of the earth as our own

### Physics: Conversion and Distance Calculations

1. Suppose my car engine has a displacement of 350 cubic inches. I wish to compare this with a European car which has a displacement of 1.7 liters. Convert 350 cubic inches to liters. 2. Suppose an astronaut on an alien planet drops a hammer and finds that it falls a total distance of 6.0 yards in 2.0 seconds. a. How far w

### Determine the change in the fraction of aluminum cube submerged in mercury with change in temperature.

An aluminum cube floats in a bowl of liquid mercury at 0 degree C. If the temperature is raised to 27.5 degree C, by what percent will the fraction of volume submerged change?

### EFFUSIVE VOLCANISM ON MARS

Can you please explain/describe effusive volcanism on Mars?

### Thermal expansion and fluid statics

An aluminum cube floats in a bowl of liquid mercury at 0oC. If the temperature is raised to 27.5oC, by what percent will the fraction of volume submerged change?

### Convert 350 cubic inches to liters. a. How far will the hammer fall in a total of 4.0 seconds. b. How much time does it take the hammer to drop the first 1.5 yards. Determine how far the bike travels after the rider quits pedaling.

1. Suppose my car engine has a displacement of 350 cubic inches. I wish to compare this with a European car which has a displacement of 1.7 liters. Convert 350 cubic inches to liters. 2. Suppose an astronaut on an alien planet drops a hammer and finds that it falls a total distance of 6.0 yards in 2.0 seconds. a. How far wil

### Gravity Discussion

You are working for a telecommunication company that has several satellites in orbit. Your job is to work with NASA to monitor the satellites to see that they are functioning satisfactorily. One day, to your horror, an expensive 300-kg satellite orbiting at a height of 2000 km above the Earth surface has a freak accident with an

### Mechanics and Gravitation: 17 Multiple choice questions

(See attached file for full problem description) --- Mark the following statements true or false. 1. (b) A conservative force can do no work on an object. 2. (a) Potential energy is necessarily a positive quantity. (b) Kinetic energy is necessarily a positive quantity. (c) The change in potential energy of an o

### Design of a cylindrical, pressurized water tank

You are assigned the design of a cylindrical, pressurized water tank for a future colony on Mars, where the acceleration due to gravity is 3.71 meters per second per second. The pressure at the surface of the water will be 105 kPa, and the depth of the water will be 13.9 m. The pressure of the air in the building outside the tan

### Speed of Traveling Planets using Kepler's Law

If D = 3.08 x 1011 meters and d = 1.08 x 1011 meters, and the green planet sweeps an area of 1 x 1014 m2 in a given short unit of time while traveling at 3.74 x 104 m/s, what is its speed at d to the nearest m/s? (See attached file for full problem description).

### Planet period versus distance from sun

In the figure the blue planet has a period of 1 year and an average distance from the sun of 1.6 x 1011 meters. If the average distance from the sun for the red planet is 0.65 x 1011 meters, what is its period to the nearest hundredth of a year? See attached file for full problem description.

### Gravity on a Different Planet

A planet/moon has a mass of 81.27 x 1023 kg and a radius of 12.95 x 106 meters. What is g on the surface to the nearest hundredth of a m/s2?

### How can planet retrograde motion be explained by the Earth-center hypothesis? By the Sun-center hypothesis?

How can planet retrograde motion be explained by the Earth-center hypothesis? By the Sun-center hypothesis?

### How can planet retrograde motion be explained by the Earth center hypothesis? By the Sun-center hypothesis?

How can planet retrograde motion be explained by the Earth center hypothesis? By the Sun-center hypothesis?

### Height of the Column of Mercury for a Mercury Barometer

What is the height in cm of the column of mercury for a mercury barometer when the atmospheric pressure at a certain locations is 1.00 atm? The density of mercury is 13.55 g/cm^3

### Center of mass of bomb fragments

A plane, flying horizontally, releases a bomb, which explodes before it hits the ground. Neglecting air resistance, what is the center of mass of the bomb fragments just after exploding? I think they move along a parabolic path?

### Force Problems5/6/7

Every few hundred years most of the plants line up on the same side of the Sun. Calculate the total forces on the Earth due to Venus, Jupiter, and Saturn, assuming all four plants are in line. The masses are Mv = 0.815Me, M3=318Me, Ms=95.1Me and their mean distance from the sun are 108,150, 778 and 1430 million km respectively.

### Physics Questions

1. (a) Calculate the mass of the earth given the acceleration of gravity at the north pole is 9.830 m/s^2 and the radius of the earth is 6371 km from pole to pole. (b) Compare this with the accepted value of 5.979 x 10^24 kg. 2. (a) Calculate the ratio r^3/T^2 for the moon's orbit about the earth, where r is the average radi

### 2 Physics Problems

1. Suppose we roll a ball off a table, at a speed of 2.0 m/s. This means that the initial velocity is completely horizontal; there is no initial component of velocity in the vertical direction. The table is 1.3 meters high. (A) How much time does it take the ball to hit the ground after leaving the table? (B) How far does the ba

### How the age of rocks can be determined by radioactivity internal structure of the Earth

A. Explain how the age of rocks can be determined by radioactivity. Give an example. b. How can scientists determine the internal structure of the Earth, if the depth of the deepest well is only a tiny fraction of the earth's diameter?

### Planetary evolution and the early solar system

F. Which is hotter, Mercury or Venus? Why? h. Explain why there are two general families of planets, rocky terrestrial and gaseous jovian. j. What knowledge do comets and asteroids provide to studies of the origin of the solar system?

### Discussion questions - eclipses, lunar phase changes, Newton

1. Explain what causes a lunar eclipse. Explain what causes a solar eclipse. Include a diagram. Why don't eclipses occur every month? 2. Describe the phase changes of the Earth that one would see if viewed from the Moon. 3. It is said that Newton unified Earth and the Universe. Explain.

### Earth Shape and Constellations

How do we know the earth is spherical? Where is the ecliptic and what constellations are along there?

### 2 problems on Kinematics: Cheetah hunting and astronaut on distant planet...

3) A cheetah is hunting. Its prey run for 2.5 s at a constant velocity of +6.9 m/s. Starting from rest, what constant acceleration must the + cheetah maintain in order to run the same distance as its prey runs in the same time? 4) An astronaut on a distant planet wants to determine its acceleration due to gravity. The astro

### Physics: Described frictional force, tension force, centripetal force, weightlessness

For each topic describe in a brief paragraph 1) Its key characteristics and 2) A personal observation, or an experience with, or an example of a real world application of the topic. A) frictional force b) tension force c) centripetal force d) weightlessness

### Three classical mechanics problems

(See attached file for full problem description) --- 1. A rock is thrown straight up from the earth's surface. Which one of the following statements concerning the net force acting on the rock at the top of its path is true? A It is equal to the weight of the rock. B It is instantaneously equal to zero newtons.

### Planet Mechanics Problems

7. A bicycle chain is wrapped around a rear sprocket (r = 0.039 m) and a front sprocket (r = 0.10 m). The chain moves with a speed of 1.4 m/s around the sprockets, while the bike moves at a constant velocity. Find the magnitute of the acceleration of a chain link that is in contact with (a) the rear sprocket, (b) neither spro

### Forces and Newton's Laws of Motion

1. An airplane has a mass of 3.1 X 104 kg and takes off under the influence of a constant net force of 3.7 X 104 N. What is the net force that acts on the plane's 78-kg pilot? 3. In the amusement park ride known as Magic Mountain Superman, powerful magnets accelerate a car and its riders from rest to 45 m/s (about 100 mi/h)

### Forces: Newtons laws of motion. Find the magnitude of a gravitational force; difference in mass of robot on two planets

On earth, two parts of a space probe weigh 16900 N and 3880 N. These parts are separated by a center-to-center distance of 17.3 m and may be treated as uniform spherical objects. Find the magnitude of the gravitational force that each part exerts on the other out in space, far from any other objects. The mass of a robot is 44

### sun rotated around the earth instead of the earth rotating around the sun

Would it be valid, in lieu of relativity, to claim that the sun rotated around the earth instead of the earth rotating around the sun?