All I need is the letter of the correct answer. 27) When a constant unbalanced force acts on an object in the direction of its motion, the object’s speed A) decreases; B) increases; C) increases then decreases; D) decreases then increases. 29. A cart of mass m traveling at speed v has a kinetic energy KE. If the mass of the cart is halved and its speed is doubled, the kinetic energy of the cart will be A) half as great; B) twice as great; C) one-fourth as great; D) four times as great. 30. Four identical resistors of resistance 5R each are connected in parallel. What is the total resistance of all resistors? A) 0.8R B) 1.25R C) 5R D) 20R
All I need is the letter of the correct answer. 27) When a constant unbalanced force acts on an object in the direction of its motion, the object’s speed A) decreases; B) increases; C) increases then decreases; D) decreases then increases. 29. A cart of mass m traveling at speed v has a kinetic energy KE. If the mass of the cart is halved and its speed is doubled, the kinetic energy of the cart will be A) half as great; B) twice as great; C) one-fourth as great; D) four times as great. 30. Four identical resistors of resistance 5R each are connected in parallel. What is the total resistance of all resistors? A) 0.8R B) 1.25R C) 5R D) 20R
Physics for Scientists and Engineers with Modern Physics
10th Edition
ISBN:9781337553292
Author:Raymond A. Serway, John W. Jewett
Publisher:Raymond A. Serway, John W. Jewett
Chapter7: Energy Of A System
Section: Chapter Questions
Problem 25P: Review. You can think of the workkinetic energy theorem as a second theory of motion, parallel to...
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All I need is the letter of the correct answer.
27) When a constant unbalanced force acts on an object in the direction of its motion, the object’s speed
A) decreases;
B) increases;
C) increases then decreases;
D) decreases then increases.
29. A cart of mass m traveling at speed v has a kinetic energy KE. If the mass of the cart is halved and its speed is doubled, the kinetic energy of the cart will be
A) half as great;
B) twice as great;
C) one-fourth as great;
D) four times as great.
30. Four identical resistors of resistance 5R each are connected in parallel. What is the total resistance of all resistors?
A) 0.8R
B) 1.25R
C) 5R
D) 20R
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