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Title: A 50-N crate is pulled up a 5.0-m inclined plane by a worker at constant velocity. If the plane is ... Post by: cdsuavet on Feb 23, 2018 A 50-N crate is pulled up a 5.0-m inclined plane by a worker at constant velocity. If the plane is inclined at an angle of 37 to the horizontal and there exists a constant frictional force of 20 N between the crate and the surface, what is the force applied by the worker?
a. zero c. 30 N b. 50 N d. 40 N [Ques. 2] If one could observe the individual atoms making up a piece of matter and note that during a process of change their motion somehow became more orderly, then one may assume which of the following in regard to the system? a. increases in entropy c. gains in thermal energy b. decreases in entropy d. positive work done on [Ques. 3] A worker pushes a sled with a force of 40 N over a level distance of 6.0 m. If a frictional force of 16 N acts on the wheelbarrow in a direction opposite to that of the worker, what total work is done on the wheelbarrow? a. 240 J c. 144 J b. 216 J d. 96 J [Ques. 4] Which of the following choices is an appropriate unit for measuring entropy changes? a. J K c. J/s b. N K d. J/K [Ques. 5] Which of the following is that form of energy associated with an object's location in a conservative force field? a. potential c. bio-chemical b. thermal d. kinetic [Ques. 6] Which of the following choices best corresponds to what is required by the second law of thermodynamics for any process taking place in an isolated system? a. entropy decreases c. entropy increases b. entropy remains constant d. entropy equals work done on the system [Ques. 7] Which of the following is that form of energy associated with an object's motion? a. potential c. bio-chemical b. thermal d. kinetic [Ques. 8] The P-V diagram of a cyclic process shows a curve that encloses an area. The work done by the heat engine, represented by the enclosed area, is positive when the path around the area proceeds in which of the following fashions? a. clockwise c. It is always positive. b. counterclockwise d. It is always negative. [Ques. 9] Which of the following is an example of a nonconservative force? a. gravity c. friction b. the force from a Hooke's law spring d. Both choices A and B are valid. [Ques. 10] On a P-V diagram, if a process involves a closed curve, the area inside the curve represents: a. internal energy. c. work. b. heat. d. zero. Title: A 50-N crate is pulled up a 5.0-m inclined plane by a worker at constant velocity. If the plane is ... Post by: Za_bby97 on Feb 23, 2018 Content hidden
Title: A 50-N crate is pulled up a 5.0-m inclined plane by a worker at constant velocity. If the plane is ... Post by: cdsuavet on Feb 23, 2018 TY
Title: A 50-N crate is pulled up a 5.0-m inclined plane by a worker at constant velocity. If the plane is ... Post by: Za_bby97 on Feb 23, 2018 My pleasure
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