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A 10 kg crate (begins 3m off the ground) slides along a smooth horizontal frictionless surface at a constant speed of 4 m/s. The crate then slides down a frictionless incline (that is 5m long) and across a second rough horizontal surface.
What is the kinetic energy as it slides on the upper surface?
What is the gravitational potential energy of the crate as it slides on the upper surface with respect to the lower surface?
What is the total energy of the crate just before starting to slide down?
What is the speed of the crate when it arrives at the lower surface?
An astronaut weighs 185 lb on earth. What is her weight on the moon, where the acceleration due to gravity is 5.28 ft/s2
The brakes of a truck cause it to slow down by applying a retarding force of 7710 N to the truck over a distance of 1050 m. What is the work done by this force on the truck
a cylinder piston initially contains 5x10^-3 m^3 of helium gas, at a pressure of 1atm and witih a temperature of 50 degrees celcius. how many moles of helium is contained by the cylinder piston
A mole of air in a closed container is initially at 300k. Suppose that you now add 10 J of heat to the air, without doing any work on it, what is the total thermal energy of the air
If a constant force of 416 N acts in the direction opposite to the body's motion, how long must the force act to bring the body to rest
A particle of charge 12uC and mass 3.8x10^-5kg is released from rest inside a parallel plate capacitor from the positive plate. How long does it take the particle to reach the negative plate
what is the electric force between the proton and electron inside of a hydrogen atom? What must the speed of the electron be? Radius=0.47 x 10^-9.
What is the magnitude of the total linear acceleration of a piece of metal on the very outer edge of the flywheel 4.1 seconds after it started to rotate
The equation of a transverse wave on a string is y = (2.0 mm) sin[ (20 m-1)x - (600 s-1)t)]. Find the linear density of this string in grams per meter
To make a simple microscope a student places two converging lenses of +20 D at opposite ends of a 34 cm long tube. What is the tube length of the microscope
if an inductor has a change of current 0.418 A to 0.948 and has an inductance of 1.324, what is the change in energy that the inductor is storing
The position of a particle moving along an x axis is given by x = 14.0t2 - 3.00t3, where x is in meters and t is in seconds. find the maximum positive velocity reached by the particle
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