34 -The electric potential due to isolated conducting sphere of radius R and total charge Q, when r ˃ R is equal to? O A) ker /R?B) ke Q /rOc) or/RO D) ke or/ROE) ke Q /R

Answered: The electric potential due to isolated…

University Physics Volume 1

18th Edition

ISBN:9781938168277

Author:William Moebs, Samuel J. Ling, Jeff Sanny

Publisher:William Moebs, Samuel J. Ling, Jeff Sanny

Chapter7: Work And Kinetic Energy

Section: Chapter Questions

Problem 31P: A constant 20-N force pushes a small ball in the direction of the force over a distance of 5.0 m....

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Which of the following is a unit of work? (4.1) (a) W (b) J s (c) N/s (d) N m
A constant 20-N force pushes a small ball in the direction of the force over a distance of 5.0 m. What is the work done by the force?
Find the simplest unit of the Q = va/w , in which v is velocity, a is acceleration and w is work. a. 1/m.s b. 1/kg.s C. m.s d. 1/kg.m
One Watt = ? A) 1 Joule/sec B) 1 erg/sec C) 1 Pascal/sec D) 1 m/s
If the speed of a particle is doubled, what happens to its kinetic energy? a. It will be half. b. It will be square root of twice as large. c. It will be four times bigger. d. It does not change e. It will be twice as big.
The work required to accelerate an object on a frictionless surface from speed v to 2v is a. You cannot know without knowledge of acceleration. b. Four times the work required to accelerate the object from 2v to 3v. c. Three times the work required to accelerate the object from v=0 to v. d. Equal to the work required to accelerate the object from v=0 to v. e. Twice the work required to accelerate the object from v=0 to v.
2. Put a check ( before the item if work is done to an object or person. a. A boy running across a playground b. A mother dancing with her baby in her arms c. A basket being lifted d. A person in an ascending elevator e. A stone whirled around a horizontal circle f. A big box dragged across the floor g. A man climbing up a tree h. A girl walking up the stairs
Determine the a.) Dot Product and b.) Cross product of the following given vectors. Given: A = 5i - 2k + 2j B = 2i + 1k + 2j Required: a.) A • B b.) A x B Solutions and Answers:
1. Carlo pushes a 35-kg box on a flor level and displaces it 5 m from its initial position. a. If the force applied to the box is 500 N, what must be the magnitude and the direction of the frictional force on the surface? b. How much work is done by Carlo and by friction on the box? c. How much work is done on the box by the normai force and by gravity? d. What is the net work done on the box by all of the forces applied to it?
Question 1 Determine the scalar product of A = 6.0î + 4.0 ĵ- 2.0 and B= 5.0 i-6.0j-3.0. A) 30 î+ 24 j+ 6 B) 30 i - 24 j+ 6 C) 12 D) 60 E) undefined OE O A OD Next
Multiple Choice: Encircle the letter that corresponds to the correct answer. 1. Work done = Force x a. displacement c. velocity d. speed b. acceleration 2. 1 Joule = 1 a. Nm? b. kg m/s? c. Nm d. N'm? 3. Which of the following is a unit of work? a. Pascal c. Newton D. Watt b. Joule 4. A boy carries a load of 500 N to a distance of 100 m. The work done by him is? а. 5 N с. О d. 1/5 N b. 50,000 Nm 5. He defined work as the product of the force and displacement in the direction of the force. a. James Watt c. Galileo Galilei d. Gaspard Coriolis b. Albert Einstein 6. You push against a rock with a force of 100 N for 20 s. If the rock does not move, then how much work in Joules have you done? а. О С. 100 b. 20 d. 2 000 7. A car engine exerts a driving force of 12 000 N. The work done by the car in traveling a distance of 500 m is a. OJ c. 6 x 10° J b. 24 J d. 6000 J 8. How much work is done in lifting a 60 kg sack of rice to a vertical distance of 10.0 m? a. 600 J c. 2310 J b. 980 J d. 5880 J
Which of the following statements are FALSE? A. Energy is a vector physical quantity. B. Energy is always required to do work. C. Total mechanical energy can never be zero. D. When law of conservation of mechanical energy is invoked, there can never be a waste energy in an ideal system. E. When law of conservation of mechanical energy is invoked, there can never be a waste energy in a real-world system. F. Kinetic energy can be negative. G. Potential energy can be negative. H. Work is equivalent to the negative change in kinetic energy. I. Work is equivalent to the negative change in potential energy. J. In a conservative system where only gravitational force acts, the total mechanical energy is constant at every point of the motion. K. In a non-conservative system where certain external forces may act, the total mechanical energy is not constant at every point of the motion. L. The entire universe may be considered as a closed system where the total energy is constant. choices O…

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