Physics of Everyday Phenomena
9th Edition
ISBN: 9781259894008
Author: W. Thomas Griffith, Juliet Brosing Professor
Publisher: McGraw-Hill Education
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Chapter 4, Problem 25CQ
When a magician performs the tablecloth trick (see everyday phenomenon box 4.1), the objects on the table do not move very far. Is there a horizontal force acting on these objects while the tablecloth is being pulled off the table? Why do the objects not move very far? Explain.
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The car manufacturer wants to see how the mass of the car affects the force required to accelerate the car by the same amount. A second set of trials are run in order to see how much force is needed to accelerate cars of different masses.
Table 2: Force and Acceleration Trials
Trial
Force (_____)
Mass (______)
Acceleration (____________)
1
6,000
500
2
6,000
1,000
6
3
6,000
2,000
3
4
6,000
3,000
2
5
6,000
4,000
Questions:
1a. Label Table 2 with the proper units for each quantity and identify the variables of this experiment:
Control: Independent Dependent:
b. Analyze the data for Trial 2 and Trial 3; how big is the acceleration in Trial 3 (compared to 2)? and How many times greater is the mass in Trial 3?
c. Analyze the data for Trial 2 and Trial 4. How much greater is the acceleration in Trial 2 (compared to 4)? and How big is the mass in Trial 2 (compared to 4)?
d. Big Idea! For the same amount of force,…
Please select TWO options as your correct answers. TWO correct answers will give you correct answer.WRONG answers If you choose ONE answer only or only ONE answer is correct.
1) A group of students is standing on the floor of an elevator. Compare the reading on the scale to their true weight if. (i) the elevator accelerating downward, (ii) the elevator is at rest.
a) Zero
b) Equal to the normal force
c) Equal to their true weight
d) Less than their true weight
e) Greater than their true weight
2)A helicopter with a mass of 810 kg, starting from rest, accelerates straight up from the roof of a hospital. A lifting force does work in raising the helicopter. (i) What two types of energy are changing? (ii) The helicopter rises from rest to a speed of 7.0 ms^1 in a time of 3.5 s. During this time it climbs to s height of 8.2 m. What is the average power generates by the lifting force?
a) 5.6 x 10^3 W
b) 1.9 x 10^4 W
c) 2.4 x 10^4 W
d) Kinetic energy and gravitational potential energy
e)…
A 26.84 kg dog jumps on a 86.86 kg bed. As the dog walks around on the bed, what is the average force that the bed applies to the dog?
Chapter 4 Solutions
Physics of Everyday Phenomena
Ch. 4 - Did Galileos work on motion precede in time that...Ch. 4 - Why did Aristotle believe that heavier objects...Ch. 4 - Aristotle believed that a force was necessary to...Ch. 4 - How did Aristotle explain the continued motion of...Ch. 4 - Did Galileo develop a more complete theory of...Ch. 4 - Two equal forces act on two different objects, one...Ch. 4 - A 3-kg block is observed to accelerate at a rate...Ch. 4 - Two equal-magnitude horizontal forces act on a box...Ch. 4 - Is it possible for the final temperature of the...Ch. 4 - Suppose that a bullet is fired from a rifle in...
Ch. 4 - Two equal forces act on an object in the...Ch. 4 - An object moving horizontally across a table is...Ch. 4 - A car goes around a curve traveling at constant...Ch. 4 - Is Newtons first law of motion explained by the...Ch. 4 - Is the mass of an object the same thing as its...Ch. 4 - The gravitational force acting on a lead ball is...Ch. 4 - The acceleration due to gravity on the moon is...Ch. 4 - Is mass a force? Explain.Ch. 4 - Two identical cans, one filled with lead shot and...Ch. 4 - A boy sits at rest on the floor. What two vertical...Ch. 4 - The engine of a car is part of the car and cannot...Ch. 4 - It is difficult to stop a car on an icy road...Ch. 4 - A ball hangs from a string attached to the...Ch. 4 - Would the tablecloth trick (see everyday...Ch. 4 - When a magician performs the tablecloth trick (see...Ch. 4 - A sprinter accelerates at the beginning of a...Ch. 4 - A mule is attempting to move a cart loaded with...Ch. 4 - The upward normal force exerted by the floor on a...Ch. 4 - A toy battery-powered tractor pushes a book across...Ch. 4 - If you get into an elevator on the top floor of a...Ch. 4 - If the elevator cable breaks and you find yourself...Ch. 4 - Two masses, m1 and m2, connected by a string, are...Ch. 4 - Two blocks with the same mass are connected by a...Ch. 4 - Suppose that a skydiver wears a specially...Ch. 4 - Prob. 35CQCh. 4 - Prob. 36CQCh. 4 - A single force of 42 N acts upon a 6-kg block....Ch. 4 - A heavy ball with a mass of 4.5 kg is observed to...Ch. 4 - A net force of 32 N acting on a wooden block...Ch. 4 - A 4.0-kg block being pulled across a table by a...Ch. 4 - A pulled tablecloth exerts a frictional force of...Ch. 4 - A 5-kg block being pushed across a table by a...Ch. 4 - Two forces, one of 70 N and the other of 30 N, act...Ch. 4 - A 5-kg block is acted upon by three horizontal...Ch. 4 - A 9-kg sled sliding freely on an icy surface...Ch. 4 - What is the weight of a 45-kg mass?Ch. 4 - What is the mass of a 735-N weight?Ch. 4 - Patricia has a weight of 125 lb. a. What is her...Ch. 4 - One of the authors of this text has a weight of...Ch. 4 - Who has the larger mass, a woman weighing 160 lb...Ch. 4 - At a given instant in time, a 6-kg rock that has...Ch. 4 - At a given instant in time, a 12-kg rock is...Ch. 4 - A 0.8-kg book rests on a table. A downward force...Ch. 4 - An upward force of 32.6 N is applied via a string...Ch. 4 - A 75-kg woman in an elevator is accelerating...Ch. 4 - A constant horizontal force of 28 N is exerted by...Ch. 4 - A rope exerts a constant horizontal force of 350 N...Ch. 4 - A dish with a mass of 0.3 kg has a force of...Ch. 4 - A 60-kg crate is lowered from a loading dock to...Ch. 4 - Two blocks tied together by a horizontal string...Ch. 4 - A 85-kg man is in an elevator that is accelerating...Ch. 4 - A skydiver has a weight of 850 N. Suppose that the...
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