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a) A 9.00 kg box slides across a level floor such that its speed changes from 4.50 m/s to 1.20 m/s over a distance of 4.00m. How much work was done by friction?
b) What was the work done by gravity?
A freezer is used to freeze 2.0 L of water completely into ice. The water andthe freezer remain at a constant temperature of T =0°C. Determine the change in the entropy of the freezer
An 81.0 N box is pulled 22.0 m up a 30° incline by an applied force of 102 N that points upward, parallel to the incline. calculate the change in the kinetic energy of the box
A laser with wavelength d/8 is shining light on a double slit with slit separation 0.450 mm. What is the wavelength of the second laser
q1. illustrate how the device equipped with an ultrasonic speaker a microphone and a precision timer might be used to
a assume the equation xat3bt describes the motion of a particular object with x having the dimension of length and t
Sewage at a certain pumping station is raised vertically by 5.30 m at the rate of 1 920 000 liters each day. The sewage, of density 1 050 kg/m3, Find the output mechanical power of the lift station
The rechargeable batteries for a laptop computer need a much smaller voltage than what a wall socket provides. What is the current coming from the wall socket
Seals may cool themselves by using thermal windows, patches on their bodies with much higher than average surface temperature. Suppose a seal has a 0.030m^2 thermal window.
A mass of 5.0 kg is attached to one end of a spring with a spring constant 80 N/m. The other end is attached to a rigid wall. The spring is initially at rest in its equilibrium position, then a force of 100 N pulls the mass away from the wall, str..
A marble slide towards a 2nd marble at rest along the surface of frictionless table-top. What is the velocity of the 2 bodies after collision
A 80 bike racer climbs a 1500 -long section of road that has a slope of 4.3 degrees. By how much does his gravitational potential energy change during this climb
A sample of an unknown material appears to weigh 285 N in air and 180 N when immersed in alcohol of specific gravity 0.700. What is the density of the material
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