Back(II) An exceptional standing jump would raise a person 0.80 m off the ground. To do this, what force must a 68-kg person exert against the ground? Assume the person crouches a distance of 0.20 m prior to jumping, and thus the upward force has this distance to act over before he leaves the ground.
A wet bar of soap (m = 150g) slides freely down a ramp 3.0 m long inclined at 8.5°. How long does it take to reach the bottom? How would this change if the soap's mass were 250 g?
A 265-kg load is lifted 18.0 m vertically with an acceleration a = 0.140 g by a single cable. Determine the tension in the cable.
(II) A rocket with a mass of 2.45 x 106 kg is launched by exerting a vertical force of 3.55 x 107 N on the gases it expels. Determine the acceleration of the rocket, Assume g remains constant, and ignore the mass of gas expelled (not realistic).
An inclined plane, fixed to the inside of an elevator, makes a 38° angle with the floor. A mass m slides on the plane without friction. What is its acceleration relative to the plane if the elevator moves upward at constant speed?
What will a spring scale read for the weight of a 58.0‑kg woman in an elevator that moves upward with constant speed 4.4 m/s?
A fisherman yanks a fish vertically out of the water with an acceleration of 2.5 m/s2 using very light fishing line that has a breaking strength of 18 N (≈ 4lb). The fisherman unfortunately loses the fish as the line snaps. What can you say about the mass of the fish?
(II) An 18.0-kg monkey hangs from a cord suspended from the ceiling of an elevator. The cord can withstand a tension of 215 N and breaks as the elevator accelerates. What was the elevator's minimum acceleration (magnitude and direction)?
A -kg wrecking ball hangs from a uniform, heavy-duty chain of mass kg. What is the tension at a point three-fourths of the way up from the bottom of the chain?
You walk into an elevator, step onto a scale, and push the 'up' button. You recall that your normal weight is N. Draw a free-body diagram. If you hold a -kg package by a light vertical string, what will be the tension in this string when the elevator accelerates as in part (a)? Note: Part (a) asked what does the scale read when the elevator has an upward acceleration of magnitude m/s2.
Three sleds are being pulled horizontally on frictionless horizontal ice using horizontal ropes (Fig. E). The pull is of magnitude N. Find the tension in ropes and .
(II) What will a spring scale read for the weight of a 58.0‑kg woman in an elevator that moves downward with constant speed 4.4 m/s?
At the surface of Jupiter's moon Io, the acceleration due to gravity is m/s2. A watermelon weighs N at the surface of the earth. What would be its mass and weight on the surface of Io?
An inclined plane, fixed to the inside of an elevator, makes a 38° angle with the floor. A mass m slides on the plane without friction. What is its acceleration relative to the plane if the elevator accelerates downward at 0.50 g?