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A 45.0 kg girl is standing on a 162 kg plank. The plank, originally at rest, is free to slide on a frozen lake, which is a flat, frictionless surface. The girl begins to walk along the plank at a constant velocity of 1.42 m/s relative to the plank.
(a) What is her velocity relative to the surface of ice in m/s.
(b) What is the velocity of the plank relative to the surface of ice in m/s
Illustrate what is the magnitude of the net gravitational force on the mass at the origin due to the other two masses?
A skier of mass 70kg is pulled up a slope by a motor driven cable. the work required to pul him 60m up a 30 degrees slope, What horsepower must a motor have to perform this task
Runner A is at first 5.4 km west of a flagpole and is running with a constant velocity of 2.6 km/h due east. Runner B is initially 3.0 km east of the flagpole and is running with the constant velocity of 8.8 km/h due west. What would be the distance ..
A 0.14 kg ball is placed in a shallow wedge with an opening angle of 126°. For each contact point between the wedge and the ball, determine the force exerted on the ball. Assume the system is frictionless.
You accidentally drop a pen from 1.1 m above the floor. How long does it take for the pen to reach the floor
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The damage caused by electric shock depends on the current flowing through the body; 1 mA can be felt and 5 mA is painful. What is the minimum voltage placed across the arms that would produce a current that could be felt by a person with dry skin
Calculate the mass flow rate (in grams per second) of blood (? = 1.0 g/cm3) in an aorta with a cross-sectional area of 2.0 cm2 if the flow speed is 30 cm/s
A rifle with a weight of 30 N fires a 5.0-g bullet with a speed of 300 m/s. If a 700-N man holds the rifle firmly against his shoulder, find the recoil speed of the man and rifle
A long straight wire carries a current that is increasing at the rate of one ampere per microsecond. find In which direction will current flow in each loop
A 50,000 kg locomotive is traveling at 50.0m/s when its engine and brakes both fail. How far will the locomotive roll before it comes to a stop
At a particular instant of time a light beam traveling in the positive x direction, find the direction of the electric field and explain
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