Universal Gravitation

At what distance from the Earth will a spacecraft on the way to the moon experience zero net force due to these two bodies because the Earth and moon pull with equal and opposite forces? Thanks

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?

Newton's Laws

If the coefficient of kinetic friction between a 12.0 kg crate and the floor is .30, what horizontal force is required to move the crate at a steady speed across the floor? What horizontal force is required if µk is zero?

help

A skier is pulled by a tow rope up a frictionless ski slope that makes an angel of 12 degree with the horizontal. The rope moves parallel to the slope with a constant speed of 1.0m/s. The force of the rope does 900J of work on the skier as the skier moves a distance of 8.0m up the incline. (a) If the rope moved with a constant s ...continues

physics

A 250g block is dropped onto a relaxed vertical spring that has a spring constant of k =2.5 N/m. The block becomes attached to the spring and compresses the spring 12 cm before momentarily stopping. While the spring is being compressed, what work is being done on the block by (a) the gravitational force and (b) the spring force? ...continues

Basic Physics (Tension; Displacement; Force etc.)

A 230kg crate hangs from the end of a rope of length L-12.0m. You push horizontally on the crate with a varying force F to move it distance d=4.00m to the side (see attached picture). (a) what is the magnitude of F when the crate is in this final position? During the crate's displacement, what are (b) the total work done on i ...continues

Universal Gravitational Constant G

Please Show all work with answer!!! An apple (m=0.20 kg) falls to the earth. Determine (a) the apple's acceleration towards the earth; (b) the earth's acceleration towards the apple. (c) Discuss the appropriate reference frames in which to determine the accelerations in (a) ansd (b).

Universal Gravitational Constant G

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).

Univer. Gravit. Constant G

Please Show all work with answer please!! Calculate the mass of the sun from the radius of the earth's orbit (1.5 x 10^11 m)., the earth's period in its orbit, and the gravitational constant G. (b) What is the density of the sun and how does it compare with the density of the earth? (The sun's radius is 6.96 x 10^ 8 m).

Universal Grav. Constant G

(a) Show that the speed of a satellite in orbit just above the surface of a planet of density ρ is proportional to the radius of the planet. (b) Imagine a small planet with the same density as the earth. What would be its radius if a sprinter capable of running 100 m in 10 s could launch herself into orbit just by running?