Physics, 29.03.2021 17:10, deontehiggins42
I don't really understand the answer, could someone help me, please :,) A motor drives a shaft of radius R/8 that is attached to the center of a wheel of radius R. The motor is turned off, and the force that the motor exerts on the shaft, Fmotor, varies with time as shown. There is also a constant frictional force of 0.4 N applied to the rim of the wheel in the opposite direction of the motion. During which time interval does the rotational kinetic energy increase and then decrease? (ans: from 3 sec to 5 sec)
Answers: 1
Physics, 22.06.2019 11:00, sudotoxic
Engineers find a new metal that is stronger than steel but much lighter. this material is also significantly cheaper than what is currently used for most aircraft, available in large quantities, and easy to manufacture. the engineers are excited because this new material will lower the costs of buying and operating airplanes for companies. what is probably the best step for the engineers to make next?
Answers: 2
Physics, 22.06.2019 12:00, P4thing
Under the action of a constant force an object accelerates at 7.8 m/s2. what will the acceleration be if (a) the force is halved? (b) the object's mass is halved? (c) the force and the object's mass are both halved? (d) the force is halved and the object's mass is doubled?
Answers: 3
Physics, 22.06.2019 16:00, lazavionadams81
At what time will the interfering waves have an amplitudeof zero?
Answers: 1
I don't really understand the answer, could someone help me, please :,)
A motor drives a shaft of r...
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