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a 50 kg sprinter, starting from rest, runs 50 m in 7.0 s at a constant acceleration. what is the magnitude of the horizontal force acting on the sprinter? what is the sprinter's average power output during the first 2.0 s of his run? what is the sprinter's power output during the final 2.0 s?
A magnetic fi eld is oriented at an angle = 60 degrees to the normal of a rectangular area. If the magnetic fi eld has a strength of B = 4*10^-3T, what is the area of a rectangle
A drop of water on a countertop reflects light from a flower held 2.2 cm directly above it. What is the focal length of the water drop
A ball is tossed from an upper story window of a building. Compute the height from which the ball is thrown.
What was the displacement of the spring. An elevator and its load have a combined mass of 1400 kg. Find out the tension in the supporting cable when the elevator, originally moving downward at 12 m/s, is brought to rest with constant acceleration i..
A small rubber wheel is used to drive a large pottery wheel, and they are mounted so that their circular edges touch. Calculate the angular acceleration of the pottery wheel
Suppose the act of throwing the tool takes the austronaut 0.7 seconds, that is she applied a force to the tool before it leaves her hand. What velocity toward the space shuttle will that have given her? And if she was 12m away from the shuttle to sta..
Four identical metallic objects carry the following charges: +1.79, +6.21, -4.16, and -9.41C. What is the final charge on each object
A stick of dynamite explodes into two pieces of masses of 3.0 kg and 2.0 kg. how far does the other piece slide
What is the stress and strain in a 2 meter high, .025 m diameter brick column that supports a mass of 100000 kg? What is the factor of safety in the brick column
Fish are hung on a spring scale to determine their mass (most fishermen feel no obligation to report the mass truthfully). How far apart are the half-kilogram marks on the scale
An electron of mass 9.11x10^-31 kg has an initial speed of 3.00x10^5 m/s. Determine the magnitude of the force exerted on the electron
q1. illustrate how the device equipped with an ultrasonic speaker a microphone and a precision timer might be used to
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