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30 Answered Questions for the topic Gravitation

Gravitation

12/06/18

A GPS satellite orbits at an altitude of 2.14×104 km above the surface of Earth. (Recall that RE = 6.37 × 106 m.)

What is the speed of the satellite?
Gravitation

08/27/18

A stone is dropped from the edge of the roof. It passes a window 2m high in 0.1s. How far is the roof above the top of the window.

This question is related to topic gravitation class 9 .please give me quick reply.
Gravitation Physics Kinetic Energy

05/06/18

Energies in orbit

A meteor with a mass of 58000 kg falls from an radius of 7.1x10^6 m above the surface of the earth.    a) What is the speed of the meteor just before impact with the surface of the earth?   b)... more

How do you find the net gravitational force and direction if there are four objects?

Four spheres of equal 8 kg are located at the corners of a square of length 0.64 m per side.   How am I supposed to find the net gravitational force AND direction of one of the objects? Do I use... more

04/11/18

Gravitational Potential Energy

How much work would be done launching a 400 kg weather balloon to an altitude of 50 km?   I'm supposed to use the equation PE = Gm1m2(1/di - 1/df) but have no idea how this equation works
Gravitation Physics Gravity

04/10/18

Concept questions for gravity

Using the force of gravity, centripetal force, and normal force; why does an astronaut on a space station appear to be weightless?
Gravitation

04/02/18

The change in the value of acceleration of earth towards sun,when the moon comes from the position on the other side of earth in line with sun is:

(mass of moon=7.36*10 power 22 kg radius of moon's orbit=3.8*10 power 8) options are a.6.73*10 power -3 m/s square b.6.73*10 power -5 m/s square
Gravitation

01/24/18

A man weighs 440N on the earths surface what will be his weight one earths radius above.

A man weighs 440N on the earths surface what will be his weight one earths radius above.  
Gravitation Physics

12/30/17

Doubt in the concept of a question on gravitation and satellites

Two satellites of same mass m are revolving around earth(M) in same orbit of radius r. Rotational directions of the 2 satellites are opposite, therefore they can collide. Total mechanical energy of... more
Gravitation

12/24/17

The gravitational potential difference between the surface of a planet and a point 20m above the surface is 2 joule/kg.if the gravitational field is uniform the

The gravitational potential difference between the surface of a planet and a point 20m above the surface is 2 joule/kg.if the gravitational field is uniform then the work done in carrying 5kg body... more
Gravitation Physics

12/20/17

What is the period of Pluto if it is 40 times further away form the sun than the earth?

 Learning about universal gravitation and need help answering this question
Gravitation

10/04/17

Acceleration due to gravity

One method of creating artificial gravity in space is to make a circular space station that spins and creates a centripetal force that points towards the center of the space station to simulate the... more
Gravitation

10/01/17

Calculate the velocity of the satellite

A satellite orbits in circular motion at an altitude of 5000 kilometers above the surface of the Earth. Calculate the orbital (tangential) velocity of the satellite.mEarth = 5.972 x 1024 kg rEarth... more
Gravitation

10/01/17

Calculate the radius

A black hole is an extremely dense material that can be created when an object with a large mass is condensed into a sphere with a Schwarzschild radius determined by the equation below. Calculate... more
Gravitation

10/01/17

The acceleration due to gravity

One method of creating artificial gravity in space is to make a circular space station that spins and creates a centripetal force that points towards the center of the space station to simulate the... more
Gravitation

10/01/17

Acceleration due to gravity

Calculate the acceleration due to gravity on the surface of the objects described below: a. The Moon: mmoon = 7.348 x 1022 kg , rmoon = 1.736 x 106 mb. The Sun: msun = 1.989 x 1030 kg , rsun =... more
Gravitation Physics Velocity

09/01/17

Laws of Motion related doubt

A uniform chain of length 'l' is placed on a smooth horizontal table, such that half of its length hangs over one edge. It is released from rest, the velocity with which it leaves the tables is... more

01/01/17

Gravitational Potential energy doubt

Why gravitational potential gradient is negative when a body is taken away from earth? Please resolve my doubt.
Gravitation Physics

10/24/16

Gravitation topic doubt

The Gravitation potential difference between the surface of planet and a point 20m above is 16 J/kg. Calculae the work done in moving a 4 kg mass by 8m on a slope of 60degree from the horizontal.
Gravitation Physics Acceleration

05/18/16

Force of gravity? Acceleration?

Mars has a mass of 6.4 × 1023 kg. It has a moon named Phobos with a mass of 1.07 × 1016 kg. a. If their centers are 9400 km apart, what is the force of gravity acting on Phobos?b. If the radius of... more
Gravitation Physics Momentum

05/18/16

Period and speed of pendulum?

The period of motion for a pendulum is the amount of time it takes to swing from right to left and back to right again. The period is given by the equation , where T is the period and L is the... more
Gravitation Physics Momentum

05/18/16

Speed of launcher?

Dwight uses a spring (k = 40 N/m) on a horizontal surface to make a launcher for model cars. The spring is attached to a holder that has a mass of 0.5 kg. If he compresses the spring and releases... more
Gravitation Physics Velocity

05/18/16

Spring Constant? Velocity?

Lincoln goes bungee jumping. He has a mass of 102 kg.a. After his jump, Lincoln hangs from the cord motionless, with the cord stretched by 15 m. What is the spring constant of the bungee cord?b. At... more
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