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.
How do we know the earth is spherical? Where is the ecliptic and what constellations are along there?
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
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
(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.
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
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)
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
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?
How would the seasons be affected if the Earth's axis were not inclined 23 1/2 degrees from the plane of the ecliptic, but were instead perpendicular to that orbital plane?
An astronaut on a strange new planet finds that she can jump up to a maximum height of 27. meters when her initial upward speed is 6.0 m/s. What is the magnitude of the acceleration of gravity on the planet? a. 0.50 m/s^2 b. 0.67 m/s^2 c. 1.0 m/s^2 1. .5 m/s^2 A phy
My problem is understanding this because I have to calculate the mass and radius of 3 planets along with the graviational acceleration and then find the period of a 2 meter long pendulum on each planet for the assignment. The instructor posted a formula that he used in Excel but there was no explanation. The formula: =6
Is it possible to calculate the masses of the stars in an x-ray binary system when all i know of the system is that; one of the stars is a main sequences star of spectral type K5 measured from optical spectroscopy. The companion star is believed to be a neutron star with no distinct pulsations, however the x-ray emission has exh
Why do you think ancient people took so much time to describe the stars as people and animals? (See attachment for full questions)
Question: A planet is rotating around a star. If the angular velocity of the planet at the near end is 3 rad/s, find the angular velocity at the far end: R2=3R1.
How can the temperature, composition and motion of an object be determined from its light spectrum? Please include any reference.
1. Why does pressure in the atmosphere of a planet or satellite fall with increasing height? Please see attached for full question.
How can planet retrograde motion be explained by the Earth-center hypothesis and by the Sun-center hypothesis.
During the planning stages for the Pioneer 11 mission, when relatively little was known about Saturn's rings, it was proposed to have the spacecraft fly through the Cassini division. Why would this have been a bad idea?
If Saturn's rings are not solid, why do they look solid when viewed through a telescope?
New York City is traveling around at a tangential speed of about 353 m/s (i.e., 790 mi/h) as the Earth spins. Assuming the planet is a sphere of radius 6371 km, how long is the perpendicular from the city to the spin axis? Compute the city's latitude (i.e., the angle measured above or below the equator).
After landing on an unfamiliar planet, a space explorer constructs a simple pendulum of length 47.0 cm. The explorer finds that the pendulum makes 104 complete swings in a time of 133 s. What is the value of the acceleration of gravity on this planet? Express your answer in meters per second per second (ie, meters per second^2).
1. Two airplanes are flying side by side at the same altitude. Plane A is slowly overtaking plane B at 4 km/h. A stewardess in plane A is walking toward the rear of the plane at a speed of 2 km/h, and a passenger is walking toward the front at 2 km/h. What are their speeds relative to a passenger watching them from place B? 2
The motivation for Isaac Newton to discover his laws of motion was to explain the properties of planetary orbits that were observed by Tycho Brahe and analyzed by Johannes Kepler. A good starting point for understanding this (as well as the speed of the space shuttle and the height of geostationary satellites) is the simplest or
(A) A satellite revolves around a planet at an altitude equal to the radius of the planet. The force of gravitational interaction between the satellite and the planet is F_0. Then the satellite moves to a different orbit, so that its altitude is tripled. Find the new force of gravitational interaction F_2. Express your answer in
**Please see attachment for complete questions Required: a) Consider a uniform gravitational field (a fair approximation near the surface of a planet). Find ... {see attachment} b) Consider the force exerted by a spring that obeys Hooke's law. Find {see attachment} c) Finally, consider the gravitational force generat
Compute the gravitational force between the sun (M=1.99 x 10^30 kg) and the planet Uranus (m=14.5 ME , orbital radius r=19.2 AU).
A hypothetical planet has a radius 2.5 times that of Earth, but has the same mass. What is the acceleration due to gravity near its surface?
It's your lucky day! You have been chosen by NASA to be the astronaut for its first intergalactic expedition. In your excitement for the mission, however, you forgot to read the road map and you have no idea where your spacecraft landed. Your intimate knowledge of physics will save the day since you have a detailed database of
4. The diagram (see diagram attached) represents a model of the sun, Mars and one of Mars' moons, Deimos. Please look at the model and determine which object looks most like Deimos to the person in the model who is observing from the pole of Mars. (a) Answer A (b) Answer B (c) Answer C (d) Answer D (e) Answer E Wh