Q: After an annual checkup, you leave your physician’s office, where
After an annual checkup, you leave your physician’s office, where you weighed 683 N. You then get into an elevator that, conveniently, has a scale. Find the magnitude and direction of the elevator’s a...
See AnswerQ: A nail in a pine board stops a 4.9-
A nail in a pine board stops a 4.9-N hammer head from an initial downward velocity of 3.2 m/s in a distance of 0.45 cm. In addition, the person using the hammer exerts a 15-N downward force on it. Ass...
See AnswerQ: A 75.0-kg man steps off a platform 3
A 75.0-kg man steps off a platform 3.10 m above the ground. He keeps his legs straight as he falls, but his knees begin to bend at the moment his feet touch the ground; treated as a particle, he moves...
See AnswerQ: The two blocks in Fig. P4.48 are connected by
The two blocks in Fig. P4.48 are connected by a heavy uniform rope with a mass of 4.00 kg. An upward force of 200 N is applied as shown. (a) Draw three free-body diagrams: one for the 6.00-kg block, o...
See AnswerQ: Boxes A and B are connected to each end of a light
Boxes A and B are connected to each end of a light vertical rope (Fig. P4.49). A constant upward force F = 80.0 N is applied to box A. Starting from rest, box B descends 12.0 m in 4.00 s. The tension...
See AnswerQ: You have landed on an unknown planet, Newtonia, and want
You have landed on an unknown planet, Newtonia, and want to know what objects weigh there. When you push a certain tool, starting from rest, on a frictionless horizontal surface with a 12.0-N force, t...
See AnswerQ: A mysterious rocket-propelled object of mass 45.0 kg
A mysterious rocket-propelled object of mass 45.0 kg is initially at rest in the middle of the horizontal, frictionless surface of an ice-covered lake. Then a force directed east and with magnitude F(...
See AnswerQ: The position of a training helicopter (weight 2.75 ×
The position of a training helicopter (weight 2.75 × 105 N) in a test is given by
See AnswerQ: The table* gives automobile performance data for a few types of
The table* gives automobile performance data for a few types of cars: (a) During an acceleration of 0 to 60 mph, which car has the largest average net force acting on it? The smallest? (b) During th...
See AnswerQ: An 8.00-kg box sits on a level floor
An 8.00-kg box sits on a level floor. You give the box a sharp push and find that it travels 8.22 m in 2.8 s before coming to rest again. (a) You measure that with a different push the box traveled 4....
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