Schaum's Outline of College Physics, Twelfth Edition (Schaum's Outlines)
12th Edition
ISBN: 9781259587399
Author: Eugene Hecht
Publisher: McGraw-Hill Education
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Textbook Question
Chapter 3, Problem 49SP
An unknown force acting on a 50.0-g body floating in space produces a constant
acceleration of
also in space, producing a constant acceleration of
that body?
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As a rocket ascends, its acceleration increases even though the net force on it stays constant. Why? (Assume a traveling distance small enough that the thrust, acceleration due to gravity and atmosphere do not change.)
As the rocket ascends, fuel is burned at a faster rate resulting in a larger acceleration.The rocket's mass decreases as its fuel is consumed. The same net force acting on a smaller mass results in a larger acceleration. The faster a rocket moves the more acceleration is imparted to it from a given force.As a rocket ascends its momentum increases with its speed. The greater the momentum of the rocket, the greater the acceleration imparted to it from a given force.
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A farmer is using a rope and pulley to lift a bucket of water from the bottom of a well that is h, = 9.5 m deep. The farmer
uses a force F,= 51 N to pull the bucket of water directly upwards. The total mass of the bucket of water is m; + m, = 3.7 kg.
Part (a) Select the correct free body diagram.
mg
m„gf F
mg'm,g
m„g
m,g
F
m„gTm,g
F
m,g
F,
m„gY m,g
m,g
Submit
Hint
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-Draw your own free body diagram and compare it to the ones listed.
|-What forces are acting up, what forces are acting vertically down?
Part (b) Calculate how much work Wrin J the farmer does on the bucket of water (via the rope) to raise it to ground level.
W,= 484.5
/ Correct!
Part (c) Calculate how much work W, in J gravity does on the bucket filled with water as the farmer lifts it up the well.
W,=- 206.1
W. = -206.1
Part (d) Calculate the net work Wnet in J done on the bucket of water by the two forces F1 and Fg.
Wner = 278.37
Wner = 278.4
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Chapter 3 Solutions
Schaum's Outline of College Physics, Twelfth Edition (Schaum's Outlines)
Ch. 3 - 3.42 [I] Two forces act on a point object as...Ch. 3 - 3.43 [I] Compute algebraically the resultant of...Ch. 3 - 3.44 [I] Two forces, 80 N and 100 N, acting at...Ch. 3 - 3.45 [I] Find algebraically the (a) resultant...Ch. 3 - 3.46 [I] Having hauled it to the top of a...Ch. 3 - 3.47 [II] Repeat Problem 3.46 if the handle is...Ch. 3 - 3.48 [I] A force of 100 lb acting on a body...Ch. 3 - 3.49 [I] An unknown force acting on a 50.0-g...Ch. 3 - 3.50 [I] Once ignited, a small rocket motor on a...Ch. 3 - 3.51 [II] Typically, a bullet leaves a standard...
Ch. 3 - 3.52 [I] A force acts on a 2-kg mass and gives...Ch. 3 - 3.53 [I] An object has a mass of 300 g. (a)...Ch. 3 - 3.54 [I] A horizontal cable pulls a 200-kg cart...Ch. 3 - 3.55 [II] A 900-kg car is going 20 m/s along a...Ch. 3 - 3.56 [II] A 12.0-g bullet is accelerated from rest...Ch. 3 - 3.57 [II] A 20-kg crate hangs at the end of a long...Ch. 3 - 3.58 [II] A 5.0-kg mass hangs at the end of a...Ch. 3 - 3.59 [II] A 700-N man stands on a scale on the...Ch. 3 - 3.60 [II] Using the scale described in Problem...Ch. 3 - 3.61 [II] A cord passing over a frictionless,...Ch. 3 - 3.62 [II] An elevator starts from rest with a...Ch. 3 - 3.63 [II] Just as her parachute opens, a 60-kg...Ch. 3 - 3.64 [II] A 300-g mass hangs at the end of a...Ch. 3 - 3.65 [II] A 20-kg wagon is pulled along the level...Ch. 3 - 3.66 [II] A 12-kg box is released from the top of...Ch. 3 - 3.67 [I] A wooden crate weighing 1000 N is at...Ch. 3 - 3.68 [I] Someone wearing rubber-soled shoes is...Ch. 3 - 3.69 [I] A standing 580-N woman wearing climbing...Ch. 3 - 3.70 [II] For the situation outlined in Problem...Ch. 3 - 3.71 [II] An inclined plane makes an angle of ...Ch. 3 - 3.72 [II] A horizontal force F is exerted on a...Ch. 3 - 3.73 [II] An inclined plane making an angle of ...Ch. 3 - 3.74 [III] Repeat Problem 3.73 if the coefficient...Ch. 3 - 3.75 [III] A horizontal force of 200 N is required...Ch. 3 - 3.76 [II] Find the acceleration of the blocks in...Ch. 3 - 3.77 [III] Repeat Problem 3.76 if the coefficient...Ch. 3 - 3.78 [III] How large a force F is needed in Fig....Ch. 3 - 3.79 [III] In Fig. 3-28, how large a force F is...Ch. 3 - 3.80 [III] (a) What is the smallest force parallel...Ch. 3 - 3.81 [III] A 5.0-kg block rests on a incline. The...Ch. 3 - 3.82 [III] Three blocks with masses 6.0 kg, 9.0...Ch. 3 - 3.83 [I] Floating in space far from anything...Ch. 3 - 3.84 [I] Two cannonballs that each weigh 4.00...Ch. 3 - 3.85 [I] Imagine a planet and its moon...Ch. 3 - 3.86 [I] Two NASA vehicles separated by a...Ch. 3 - 3.87 [I] Suppose you are designing a small,...Ch. 3 - Prob. 88SPCh. 3 - Prob. 89SPCh. 3 - 3.90 [II] A space station that weighs 10.0 MN on...Ch. 3 - 3.91 [II] An object that weighs 2700 N on the...Ch. 3 - 3.92 [II] Imagine a planet having a mass twice...Ch. 3 - 3.93 [II] The Earth’s radius is about 6370 km. An...Ch. 3 - 3.94 [II] A man who weighs 1000 N on Earth stands...Ch. 3 - 3.95 [II] The radius of the Earth is about 6370...Ch. 3 - 3.96 [II] The fabled planet Dune has a diameter...Ch. 3 - 3.97 [III] An astronaut weighs 480 N on Earth. She...
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