# Shared Flashcard Set

## Details

Ch 7 Work and Energy Physics for Scientists and Engineers
Ch 7 Work and Energy Physics for Scientists and Engineers 3 ed Giancoli
26
Physics
11/04/2013

Term
 Two men, Joel and Jerry, push against a wall. Jerry stops after 10 min, while Joel is able to push for 5 min longer. Compare the work against the wall they each do.
Definition
 Neither of them do any work.
Term
 What does the graphs that illustrates Hooke's Law (the spring force) look like
Definition
 [image]
Term
 A simple pendulum, consisting of a mass m and a string, swings upward, making an angle θ with the vertical. The work done by the tension force is [image]
Definition
 zero.
Term
 [image] What is the mass of the pendulum 'bob' in the figure?
Definition
 1 kg   W = mgd 9.8/(9.8*1m) = 1kg
Term
 What is the total mechanical energy, ME, of the pendulum? [image]
Definition
 9.8 J   ME = PE+KE ME = 9.8 + 0
Term
 What is the maximum kinetic energy of the pendulum? [image]
Definition
 9.8J
Term
 What is the potential energy, PE, at Point B and D?[image]
Definition
 4.9J W=mad W = 1kg * 9.8 * .5m
Term
 At Point B and D what is the relationship between the kinetic energy, KE and[image] the potential energy, PE?
Definition
 KE = PE
Term
 What is the speed of the pendulum at Point B and D?[image]
Definition
Term
 What is the speed of the pendulum at Point C? [image]
Definition
 4.4 m/s   ((mv^2)/2) = mad note= distance traveled is 1m
Term
 A simple pendulum, consisting of a mass m, is attached to the end of a 1.5 m length of string. If the mass is held out horizontally, and then released from rest, its speed at the bottom i[image]s
Definition
 5.4 m/s KE = mv^2/2 sqrt(2ad) = v
Term
 A 4-kg mass moving with speed 2 m/s, and a 2-kg mass moving with a speed of 4 m/s, are gliding over a horizontal frictionless surface. Both objects encounter the same horizontal force, which directly opposes their motion, and are brought to rest by it. Which statement best describes their respective stopping distances?
Definition
 The 2-kg mass travels twice as far as the 4-kg mass before stopping.
Term
 A 4-kg mass moving with speed 2 m/s and, an otherwise identical, 2-kg mass moving with a speed of 4 m/s, are gliding over a horizontal surface with friction and are brought to rest by it. Which statement best describes their respective stopping distances?
Definition
 he 2-kg mass travels greater than twice as far. retarding force
Term
 A force that Object A exerts on Object B is observed over a 10-second interval, as shown on the graph. How much work did Object A do during that 10 s? [image]
Definition
 25J
Term
 A force that Object A exerts on Object B is observed over a 10-second interval, as shown on the graph. What is the average power output of A into B? [image]
Definition
 2.5W   Watt = Work/time
Term
 The resultant force you exert on a shopping cart, for a 10 s period, is plotted on the graph shown. How much work did you do during this 10 s interval?[image]
Definition
 Zero
Term
 The resultant force you exert on a shopping cart, for a 10 s period, is plotted on the graph, shown. What is the average power? [image]
Definition
 The average power is zero.
Term
 How much work was required to bring the 1000-kg roller coaster from Point P to rest at Point Q at the top of the 50 m peak? [image]
Definition
 490,000 J W = mad 1000*9.8*50
Term
 If the roller coaster leaves Point Q from rest, how fast is it traveling at Point R? [image]
Definition
Term
 If the roller coaster leaves Point Q from rest, what is its speed at Point S (at the top of the 25-m peak) compared to its speed at Point R? [image]
Definition
 [image]
Term
 What was the total work done on you by all the forces in the universe between the time just before you awoke this morning and right now?
Definition
 Zero.
Term
 Two cars, starting from rest at the same place, travel by different routes to the same destination. One of the cars passes the other as they drive through it. Which of the following statements will be true?
Definition
 The work done by gravity is the same on both.
Term
 The work done by friction, f, is equal to
Definition
 equals -fd, where d is the total distance moved. The angle is always 180 degrees.
Term
 A 102 kg man climbs a 5.0 meter high stair case at constant speed. How much work does he do?
Definition
 5000 J
Term
 A ball is released, from rest, at the left side of the loop-the-loop, at the height shown (h = 2R). If the radius of the loop is R and there is no friction, what vertical height does the ball rise to on the other side? [image]
Definition
 2R
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