Mechanics | Relativity Answers

(a) How much does a 70.0 kg person weigh on the Earth?
(b) How much would she weigh on the Moon (gmoon = 0.166g)?
(c) How much would she weigh on a neutron star where gstar = 1.43×10[sup]11[/sup]g?

An airplane of mass 2867 kg flies at a constant horizontal velocity. The force of air resistance on it is 2225 N. What is the net force on the plane (magnitude and direction)?

What is the weight on Earth of 250 kg of bricks?

Calculate the potential energy of a 5kg mass when it is (i)3m,(ii)6 above the ground.( g=10N\kg)

A 224 kg crate is pushed horizontally with a force of 710 N. If the coefficient of friction is 0.25, calculate the acceleration of the crate.

A 1250 kg car is pulling a 325 kg trailer. Together, the car and trailer have an acceleration of 2.15 m/sec^2. Determine the net force on the car-trailer combination. What is the net force on the trailer?

A 3kg box slides down a 30.0 degree ramp with an acceleration of 1.4 m/sec^2. Determine the coefficient of kinetic friction between the box and the ramp.

A 100 kg astronaut in space is at the midpoint between two stars of equal mass. If all other objects are infinitely far away, what is the mass of the astronaut and the force of gravity on the astronaut?

A moving rope (parallel to the slope) is used to pull skiers up the mountain. If the slope of the hill is 37 degrees and friction is negligible, what force must the rope provide to pull a 500 N person up the hill at a constant rate?

A 60 kg boy and a 40 kg girl decide to play "tug of war" on a frictionless surface. In the process, the girl accelerated toward the boy at 3.0 m/sec^2. What is the acceleration of the boy toward the girl?