Which best summarizes a concept related to the work-energy theorem? When work is positive, the environment does work on an object.
When work is negative, the environment does work on an object.
When work is positive, the kinetic energy in a system remains constant.
When work is negative, the kinetic energy in a system remains constant.
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Rank the torques on the five doors shown in the figure above from least to greatest. note that the magnitude of all the forces is the same

Aferris wheel is a vertical, circular amusement ride with radius 9 m. riders sit on seats that swivel to remain horizontal. the ferris wheel rotates at a constant rate, going around once in 9 s. consider a rider whose mass is 56 kg. at the bottom of the ride, what is the perpendicular component of the rate of change of the rider's momentum? at the bottom of the ride, what is the vector force exerted by the seat on the rider?

Will give brainliest! jay rides his 2.0-kg skateboard. he is moving at speed 5.8 m/s when he pushes off the board and continues to move forward in the air at 5.4 m/s. the board now goes forward at 13 m/s.a. determine jay’s mass.b. determine the change in the internal energy of the system during this process.(express your answer to two significant figures and include the appropriate units.)