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A 77-kg man standing on a scale in an elevator notes that as the elevator rises, the scale reads 841 N. What is the acceleration of the elevator?
A thin spherical shell of mass 4.00 kg and diameter 0.200 m is filled with helium (density ? = 0.180 kg/m3). How long will it take for the top of the shell to reach the water surface
A 91 g arrow is fired from a bow whose string exerts an average force of 115 N on the arrow over a distance of 78 cm. Illustrate what is the speed of the arrow as it leaves the bow?
Assume a spherical membrane vesicle of diameter 50nm( about the size of a synaptic vesicle), What is the capacitance of the vessicle
A rope applies a horizontal force of 180N to pull a crate a distance of 2m across the floor A frictional force of 60N opposes this motion.
how much money does it cost to leave a 100 watt light bulb on for 1 hour if electricity sells for 10cents per kW-h. a) 1cent b) 8 cent c) 22 cent d) 44cent e)100 cent
A diver pushes off horizontally from the top of a vertical cliff that is 40.0 m high from water surface below. How long is the diver in the air
An ice skater is traveling in a straight, horizontal line on the ice with a velocity of v=5.5m/s in the positive x direction. Write an expression for the normal force, F_n, that the ice pushes against both skates together
A magnesium surface has a work function of 3.68 eV. Calculate the maximum kinetic energy of the ejected electrons
You are spin coating a thin layer of polymer onto a reflective silicon wafer to create an organic solar cell device. What thickness would you determine the film to be
a gymnast is performing a floor routine. In a tumbling run she spins through the air, How much time does this maneuver take
A beam of light is incident in air with an incident angle 56 degrees. calculate the index of refraction of this unknown liquid
q1. points a and b have electric potentials of 320 and 160 respectively. when an electron released from rest at point a
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