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In one day, a 75 kg mountain climber ascends from the 1400 m level on a vertical cliff to the top at 2380 m . The next day, she descends from the top to the base of the cliff, which is at an elevation of 1350 m .
A- What is her change in gravitational potential energy on the first day?
B- What is her change in gravitational potential energy on the second day?
A factory worker pushes horizontally to the right on a 250 N crate with a force of P = 75.0 N on a horizontal rough floor. A 135 N crate rests on top of the one being pushed and moves along with it. Call the bottom crate {rm A} and the top crate {..
You are arguing over a cell phone while trailing an unmarked police car by 25.0 m; both your car and the police car are traveling at 120 km/h. What is the separation between the two cars when your attention finally returns
A cosmic-ray proton is moving at such a speed that it can travel from the Moon to Earth in 1.5s. At what fraction of the speed of light is the proton moving
Suppose an object is set sliding, with a speed less than escape velocity, on an infinite frictionless plane in contact with the surface of the Earth. Describe its motion.
if the radius of curvature of the concave mirror is 15 cm, what is the position,nature and magnification of the image
A radio receiver can detect signals with electric field amplitudes as small as 250?V/m. What is the intensity of the smallest detectable signal
A parallel plate capacitor consists of 2 square plates 19 cm per side spaced .55 mm apart with only air between them. What is the maximum energy that can stored by the capacitor
A long string of tension T and mass density η is attached to a small sphere of mass m. What is the displacement of the string on the right side of the mass
Hurricane winds of 95 m/h are blowing over the flat roof of a well sealed house. What is the difference in air pressure between the inside and outside of the house
Initially at a temperature of 87.0?C, 0.300m3 of air expands at a constant gauge pressure of 1.39×105Pa to a volume of 1.47m3, Compute the total work done by the air
Amber (n = 1.546) is a transparent brown-yellow fossil resin. An insect, trapped and preserved within the amber, How far below the surface is the insect actually located
A moving particle encounters an external electric field that decreases its kinetic energy from 8650 eV to 7540 eV as the particle, Determine the charge of the particle. Include the algebraic sign (+ or ?)
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