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A bed rests on two scales which are 2.0 meters apart. A person lies down on the bed with their feet over one scale which reads 320. N while the other scale reads 380. N. How far from the persons feet is the center of mass?
A thin spherical shell of mass 0.300 kg and diameter 0.190 m is filled with alcohol. It is then released from rest on the bottom of a pool of water. Find the acceleration of the alcohol filled shell as it rises toward the surface of the water.
An engineer is designing the runway for an airport. Of the planes that will use the airport, the lowest acceleration rate is likely to be 3 m/s2. The takeoff speed for this plane will be 65 m/s. Assuming this minimum acceleration, what is the minimum..
A battery produces 41.4 V when 7.40 A is drawn from it and 46.2 V when 2.20 A is drawn, What is the internal resistance of the battery
A 10.4 m long steel beam is accidentally dropped by a construction crane from a height of 8.67 m. What is the induced EMF in the beam just before impact with the Earth
A horizontal force of 750 N is needed to overcome the force of static friction between a level floor and a 250-kg crate. what is the coefficient of static friction
A race car starts from rest on a circular track of radius 375 m. The car's speed increases at the constant rate of 0.727 m/s^2 , Find the elapsed time at the same moment
What is the magnitude of the force (in N) the second child must exert to keep the door from moving? Assume friction is negligible.
The balance wheel of a watch oscillates with an angular amplitude of ? rad and a period of 0.830 s. Find the maximum angular speed of the wheel
A wave pulse travels down a slinky. The mass of the slinky is m = 0.86 kg and is initially stretched to a length L = 7.8 m. What is the average speed of a piece of the slinky
Most of the motion generated by joints in the human body are examples of levers. An example of a third class lever is the forearm; what force is exerted by the biceps muscle
What is the launch speed of a projectile that rises vertically above the Earth to an altitude equal to four times the Earth's radius before coming to rest momentarily
A 65 kg high jumper starts his push-off phase with his center of mass .45 m above groung and velocity of 0 m/s. How much work did the mat do on the high jumper
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