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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.

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)

Earth axis

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?

Radius, Mass of Planets and Period of a Pendulum

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

Masses of x-ray binary stars

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

Physics: Solving for Angular Velocity

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.

Physics Astronomy

1. Why does pressure in the atmosphere of a planet or satellite fall with increasing height? Please see attached for full question.

Cassini Division

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?

Rotational Motion of New York City

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).

Theory of Relativity

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

Properties of Circular Orbits

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

Potential Energy Calculations

**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

Gravitation problem

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?

Finding Acceleration Due to Gravity

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

Model of the sun, Mars and one of Mars' moons, Deimos

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

The Lorentz-Fitzgerald Contraction

The USS Enterprise approaches the planet Seti Alpha 5 at a speed of 0.800c. Captain Kirk observes an airplane runway on the planet to be 2.00 km long. The air controller on the planet says that the runway on the planet is how long?

Chemical differentiation

How does chemical differentiation explain the distribution of material within terrestrial planets?

Superior planet

Superior planet can have only one X with the Sun during its synodic period, while an inferior planet can have two. What is X


What does it mean when scientist said reality is rational?

Spacecraft orbiting -- need to find the period

A spacecraft is in orbit around Jupiter. The radius of the orbit is 3.0 times the radius of Jupiter (RJupiter = 71,500 km). The gravitational acceleration at the surface of Jupiter (the surface is defined as the above radius) is 23 m/s2. Without using any other information about Jupiter, what is the period of the spacecraft's