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BAED-PHYC2121 General Physics 1
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6.5 Conservative Versus Nonconservative Forces and Conservation of Energy
A 50-N crate is pulled up a 5.0-m inclined plane by a worker at constant velocity. If the plane is inclined at an angle of 37° to the horizontal and there exists a constant frictional force of 20 N between the crate and the surface, what is the force applied by the worker?100%
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Suppose the gravitational potential energy for a mass at an altitude of one Earth radius is PE1 and at two Earth radii is PE2. How do the absolute values of these potential energies compare?
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A 1,500-kg automobile moving at 23 m/s has the brakes applied with a deceleration of 8.0 m/s2. How far does the car travel before it stops?
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5.1 Uniform Circular Motion
A point on the rim of a 0.30-m radius rotating wheel has a tangential speed of 4.0 m/s. What is the tangential speed of a point 0.10 m from the center of the same wheel?0%
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A ventilation fan has blades 0.25 m in radius rotating at 20 rpm. What is the tangential speed of each blade tip?
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A Hooke's law spring is mounted horizontally over a frictionless surface. The spring is then compressed a distance d and is used to launch a mass m along the frictionless surface. What compression of the spring would result in the mass attaining double the kinetic energy received in the above situation?
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Popeye, of mass 70 kg, has just downed a can of spinach. He accelerates quickly and stops Bluto, of mass 700 kg (Bluto is very dense), who is charging in at 5.0 m/s. What was Popeye's remarkable speed?100%
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When we subtract a velocity vector from another velocity vector, the result is
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Which is smallest, an atom, a nucleus, a proton, or an electron?
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3.2 Normal Forces and Weight
Three identical 6.0-kg cubes are placed on a horizontal frictionless surface in contact with one another. The cubes are lined up from left to right and a force is applied to the left side of the left cube causing all three cubes to accelerate to the right at 3.0 m/s2. What is the magnitude of the force exerted on the middle cube by the left cube in this case?0%
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