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A child is playing by jumping on a bathroom scale. The mass of the child is 31 kg and when he stands on a bathroom scale, the spring inside the scale compresses 0.46 mm. Spring constant is 6.6e5. If the scale will be damaged if the force exceeds 38000 N, what is the maximum height the child can jump on the scale so the scale will not be damaged?
A person pulls a 26kg suitcase using a rope attached to the suitcase at an angle of 28 degrees to the horizontal. The coefficient of static friction of the suitcase with the floor is 0.3 and the coefficient of kinetic friction is 0.20.
A 87 gram piece of metal is heated to 98°C and placed into 200mL of water insulated at 20°C. If the equilibrium temperature is 26.64, find the heat gained by the water
A spaceship needs to change its course by angle ?. The ship's engines can exert a force F in any direction. For how long do the engines need to remain on
A Carnot engine has an efficiency of 18.2%. It operates between constant-temperature reservoirs differing in temperature by 138 C °. determine the temperature of the cold reservoir
A ball moving at 5ms collides head on elastically with a ball at rest. what are the velocities of the two balls after the collision
The sound level 23 m from a loudspeaker is 65 dB. What is the rate at which sound energy is produced by the loudspeaker
A small block with a mass of 0.120kg is attached to a cord passing through a hole in a frictionless, horizontal surface. The block is originally revolving at a distance of 0.50 m from the hole with a speed of 0.70m/s. The cord is then pulled from ..
A 2.0 kg ball swings in a vertical circle on the end of an 80cm long string. Calculate the speed, magnitude and direction of acceleration
It's possible to estimate the percentage of fat in the body by measuring the resistance of the upper leg rather than the upper arm, What are the fractions of muscle and fat in the leg
As a protest against the umpire's calls, a baseball pitcher throws a ball straight up into the air at a speed of 17.0 m/s. find the force he exerts on the ball to give it this upward speed
What is the image distance and What is the lateral magnification
A 839-N man stands in the middle of a frozen pond of radius 6.0 m. He is unable to get to the other side because of a lack of friction between his shoes and the ice. How long does it take him to reach the south shore
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