An 80.0 kg athlete stands on scale in an elevator which is at rest. The elevator then begins accelerating upward at + 2.03 m/s? What does the scale read as his apparent weight while the elevator is accelerating? 849 N 946 N O 1,090 N 784 N O 715 N
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- A student attaches a rope to a 32 kg box, and drags it to the left with constant velocity of 1.97 m/s. The tension in the rope is 207 N at an angle of 35.7° to the ground. How much does the box weigh? Find the x and y components of the applied (tension) force: Fx = N. %3D Fy = N. How much friction must be present? How much Normal force must be present? N.A descending elevator is subject to a constant rate of acceleration, dropping 50.0 m as it goes from an initial velocity of 15.0 m/ downward, to rest. As a percentage of the occupants' masses, what is their apparent weight? 66% 77% 100% 123% 134%A crate is moving as shown is slowed down by a pushing force P. The force P has a horizontal component of 200 newtons to the left and a vertical component 300 newtons down. The mass of the crate is 90 kgs and the coefficient of kinetic friction is 0.2 and static friction is 0.4. V P What is the magnitude of the acceleration of the crate? Answer in m/s². Use g = 10 m/s². Don't guess! Use the free body diagram method.
- A wooden box of mass 30 kg slides on a concrete floor. What is the coefficient of friction if the frictional force acting between the box and the surface is 180 N? 0.061 0.312 0.031 O 0.612A horizontal force of 5.0 N pushes a 0.50-kg block against a vertical wall. The block is initially at rest. If µ. – 0.60 and 0.50, the acceleration of the block is: Ⓒ4.8 m/s² Ⓒ3.8 m/s² Ⓒ 9.8 m/s² 0.0 m/s² 08.0 m/s2Joe, a carpenter with a weight of 600 N, is working on a scaffold. His young son Jack is helping him. Jack has a weight of 450 N. The scaffold is held up by two ropes. One rope has an upward tension of 750 N. The weight of the scaffold is 400 N. What is the upward tension in the other rope? Which below is correct? 700 N 850 N 1000 N 750 N
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