1.A 64.0-kg person stands on a bathroom scale that is on the floor of an elevator. The scalereads 790 N. Which of the following situations could possibly cause this reading?(1) The elevator is moving upward while its speed is increasing.(2) The elevator is moving upward while its speed is decreasing.(3) The elevator is moving downward while its speed is increasing.(4) The elevator is moving downward while its speed is decreasing.2 and 3b)1 onlyc)2 onlyd) 2 and 4e)1 and 42.A baseball player throws a ball horizontally at 17.5 m/s from a height of 2.50 m above theground. What will the magnitude of its velocity be when it strikes the ground?a) 49.0 m/sb) 24.5 m/sc)10.5 m/sd) 28.0 m/se) 18.8 m/s3. A child of mass 44.0 kg takes a ride on an irregularly shaped slide of height 2.50 m. Thechild starts from rest at the top. What is the speed of the child at the bottom assumingthat there is no friction?a) 24.5 m/s3.50 m/sc)49.0 m/sd) 4.95 m/se) 7.00 m/s4.A ball of mass m = 380 g on the end of a string is cleverly revolved in a vertical circle ofradius 54.0 cm at a speed of 8.00 m/s. What is the tension in the string when the ball is atthe bottom and the top of its path respectively?a) 45.0 N; 41.3 Nb) 48.8 N; 45.0 Nc) 41.3 N; 48.8 Nd) 41.3 N; 3.72 N¢)488N;41GN2

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1. A 64.0-kg person stands on a bathroom scale that is on the floor of an elevator. The scale reads 790 N. Which of the following situations could possibly cause this reading? (1) The elevator is moving upward while its speed is increasing. (2) The elevator is moving upward while its speed is decreasing. (3) The elevator is moving downward while its speed is increasing. (4) The elevator is moving downward while its speed is decreasing. a) 2 and 3 b) 1 only c) 2 only d) 2 and 4 e) 1 and 4 above.

1. A 64.0-kg person stands on a bathroom scale that is on the floor of an elevator. The scale reads 790 N. Which of the following situations could possibly cause this reading? (1) The elevator is moving upward while its speed is increasing. (2) The elevator is moving upward while its speed is decreasing. (3) The elevator is moving downward while its speed is increasing. (4) The elevator is moving downward while its speed is decreasing. a) 2 and 3 b) 1 only c) 2 only d) 2 and 4 e) 1 and 4 above.

College Physics

11th Edition

ISBN:9781305952300

Author:Raymond A. Serway, Chris Vuille

Publisher:Raymond A. Serway, Chris Vuille

Chapter1: Units, Trigonometry. And Vectors

Section: Chapter Questions

Problem 1CQ: Estimate the order of magnitude of the length, in meters, of each of the following; (a) a mouse, (b)...

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Concept explainers

Newton’s Third Law of Motion

The horse pulls the cart and the cart pulls the horse in response as per Newton third law. So the big question is, “Don’t the two forces cancel each other? How does the cart accelerate?”

Question

1.
A 64.0-kg person stands on a bathroom scale that is on the floor of an elevator. The scale
reads 790 N. Which of the following situations could possibly cause this reading?
(1) The elevator is moving upward while its speed is increasing.
(2) The elevator is moving upward while its speed is decreasing.
(3) The elevator is moving downward while its speed is increasing.
(4) The elevator is moving downward while its speed is decreasing.
2 and 3
b)
1 only
c)
2 only
d) 2 and 4
e)
1 and 4
2.
A baseball player throws a ball horizontally at 17.5 m/s from a height of 2.50 m above the
ground. What will the magnitude of its velocity be when it strikes the ground?
a) 49.0 m/s
b) 24.5 m/s
c)
10.5 m/s
d) 28.0 m/s
e) 18.8 m/s
3. A child of mass 44.0 kg takes a ride on an irregularly shaped slide of height 2.50 m. The
child starts from rest at the top. What is the speed of the child at the bottom assuming
that there is no friction?
a) 24.5 m/s
3.50 m/s
c)
49.0 m/s
d) 4.95 m/s
e) 7.00 m/s
4.
A ball of mass m = 380 g on the end of a string is cleverly revolved in a vertical circle of
radius 54.0 cm at a speed of 8.00 m/s. What is the tension in the string when the ball is at
the bottom and the top of its path respectively?
a) 45.0 N; 41.3 N
b) 48.8 N; 45.0 N
c) 41.3 N; 48.8 N
d) 41.3 N; 3.72 N
¢)
488N;41GN
2

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