Engineering Physics Exam 2 Guide: Key Concepts & Questions

9/28/2019 Exam 2: Engineering Physics-PHYS201-20786-2019FA https://cerritos.instructure.com/courses/36754/quizzes/72494 1/19 Exam 2 Due Oct 1 at 5:30pm Points 100 Questions 34 Available Sep 23 at 8am - Oct 1 at 5:30pm 8 days Time Limit None Instructions Attempt History Attempt Time Score LATEST Attempt 1 2,486 minutes 97 out of 100 Score for this quiz: 97 out of 100 Submitted Sep 28 at 3:29pm This attempt took 2,486 minutes. The exam is due Tuesday October 1st at 5:30 PM. No late exams will be accepted. 3 / 3 pts Question 1 You swing a bat and hit a heavy box with a force of 1500 N. The force the box exerts on the bat is less than 1500 N if the box moves. exactly 1500 N only if the box does not move. greater than 1500 N if the bat bounces back. exactly 1500 N whether or not the box moves. Correct! Correct! greater than 1500 N if the box moves. 3 / 3 pts Question 2

9/28/2019 Exam 2: Engineering Physics-PHYS201-20786-2019FA https://cerritos.instructure.com/courses/36754/quizzes/72494 2/19 A 20-ton truck collides with a 1500-lb car and causes a lot of damage to the car. During the collision the force on the car due to the collision is much greater than the force on the truck. the force on the truck due to the collision is slightly greater than the force on the car. the car and the truck have the same magnitude acceleration. the force of on the truck due to the collision is exactly equal to the force on the car. Correct! Correct! 3 / 3 pts Question 3 An object is moving to the right, and experiencing a net force that is directed to the right. The magnitude of the force is decreasing with time. The speed of the object is constant in time. decreasing. increasing. Correct! Correct! 3 / 3 pts Question 4 A stalled car is being pushed up a hill at constant velocity by three people. The net force on the car is

9/28/2019 Exam 2: Engineering Physics-PHYS201-20786-2019FA https://cerritos.instructure.com/courses/36754/quizzes/72494 3/19 down the hill and equal to the weight of the car. up the hill and equal to the weight of the car. down the hill and greater than the weight of the car. up the hill and greater than the weight of the car. zero. Correct! Correct! 3 / 3 pts Question 5 On its own, a certain tow-truck has a maximum acceleration of . What would be the maximum acceleration when this truck was towing a bus of twice its own mass? 2.0 m/s 2 1.0 m/s Correct! Correct! 2 1.5 m/s 2 2.5 m/s 2 3 / 3 pts Question 6 Two forces act on a object. One force has magnitude 65 N directed 59° clockwise from the positive x -axis, and the other has a magnitude 35 N at 32° clockwise from the positive y -axis. What is the magnitude of this object's acceleration? 1.5 m/s 2

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9/28/2019 Exam 2: Engineering Physics-PHYS201-20786-2019FA https://cerritos.instructure.com/courses/36754/quizzes/72494 4/19 1.1 m/s Correct! Correct! 2 1.3 m/s 2 1.7 m/s 2 3 / 3 pts Question 7 A block is on a frictionless horizontal table, on earth. This block accelerates at when a horizontal force is applied to it. The block and table are then set up on the moon where the acceleration due to gravity is . What is the weight of the block on the moon? 39 N 58 N 67 N 77 N Correct! Correct! 48 N 3 / 3 pts Question 8 Two objects having masses m and m are connected to each other as shown in the figure and are released from rest. There is no friction on the table surface or in the pulley. The masses of the pulley and the string connecting the objects are completely negligible. What must be true about the tension T in the string just after the objects are released? 1 2

9/28/2019 Exam 2: Engineering Physics-PHYS201-20786-2019FA https://cerritos.instructure.com/courses/36754/quizzes/72494 5/19 T > m g 2 T < m g Correct! Correct! 2 T = m g 2 T = m g 1 T > m g 1 3 / 3 pts Question 9 A 60.0-kg person rides in an elevator while standing on a scale. The scale reads . The acceleration of the elevator is closest to 3.13 m/s downward. Correct! Correct! 2 9.80 m/s downward. 2 zero. 6.67 m/s upward. 2 6.67 m/s downward. 2

9/28/2019 Exam 2: Engineering Physics-PHYS201-20786-2019FA https://cerritos.instructure.com/courses/36754/quizzes/72494 6/19 3 / 3 pts Question 10 A driver in a car traveling at slams on the brakes and skids to a stop. If the coefficient of friction between the tires and the horizontal road is 0.80, how long will the skid marks be? 24 m 26 m Correct! Correct! 33 m 21 m 3 / 3 pts Question 11 A 60.0-kg person rides in elevator while standing on a scale. The elevator is traveling downward but slowing down at a rate of 2.00 m/s . The reading on the scale is closest to 2 708 N. Correct! Correct! 589 N. 120 N. 349 N. 469 N. 3 / 3 pts Question 12

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9/28/2019 Exam 2: Engineering Physics-PHYS201-20786-2019FA https://cerritos.instructure.com/courses/36754/quizzes/72494 7/19 Three objects are connected as shown in the figure. The strings and frictionless pulleys have negligible masses, and the coefficient of kinetic friction between the 2.0-kg block and the table is 0.25. What is the acceleration of the 2.0-kg block? 3.2 m/s 2 4.0 m/s 2 2.5 m/s Correct! Correct! 2 1.7 m/s 2 3 / 3 pts Question 13 A 6.0 kg box slides down an inclined plane that makes an angle of 39° with the horizontal. If the coefficient of kinetic friction is 0.19, at what rate does the box accelerate down the slope? 6.2 m/s 2 4.7 m/s Correct! Correct! 2 5.5 m/s 2 5.2 m/s 2 3 / 3 pts Question 14

9/28/2019 Exam 2: Engineering Physics-PHYS201-20786-2019FA https://cerritos.instructure.com/courses/36754/quizzes/72494 8/19 A 200 g hockey puck is launched up a metal ramp that is inclined at a 30° angle. The coefficients of static and kinetic friction between the hockey puck and the metal ramp are and , respectively. The puck's initial speed is . What vertical height does the puck reach above its starting point? 130 m Correct! Correct! 200 m 270 m 66 m 3 / 3 pts Question 15 A 4.00-kg block rests on a 30.0° incline as shown in the figure. If the coefficient of static friction between the block and the incline is 0.700, what magnitude horizontal force F must act on the block to start it moving up the incline? 76.4 N 34.0 N 84.0 N Correct! Correct! 54.7 N

9/28/2019 Exam 2: Engineering Physics-PHYS201-20786-2019FA https://cerritos.instructure.com/courses/36754/quizzes/72494 9/19 51.1 N 3 / 3 pts Question 16 Two blocks are connected by a string that goes over an ideal pulley as shown in the figure. Block A has a mass of 3.00 kg and can slide over a rough plane inclined 30.0° to the horizontal. The coefficient of kinetic friction between block A and the plane is 0.400. Block B has a mass of 2.77 kg. What is the acceleration of the blocks? 0.392 m/s Correct! Correct! 2 5.35 m/s 2 1.96 m/s 2 0.00 m/s 2 3.12 m/s 2 0 / 3 pts Question 17 A 250-kg crate is on a rough ramp, inclined at 30° above the horizontal. The coefficient of kinetic friction between the crate and ramp is 0.22. A horizontal

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9/28/2019 Exam 2: Engineering Physics-PHYS201-20786-2019FA https://cerritos.instructure.com/courses/36754/quizzes/72494 10/19 force of 5000 N is applied to the crate, pushing it up the ramp. What is the acceleration of the crate? 13 m/s You Answered You Answered 2 10 m/s 2 12 m/s 2 8.4 m/s orrect Answer orrect Answer 2 3.4 m/s 2 3 / 3 pts Question 18 A traffic light weighing 100 N is supported by two ropes as shown in the figure. The tensions in the ropes are closest to 56 N. 83 N. Correct! Correct! 66 N. 50 N. 63 N.

9/28/2019 Exam 2: Engineering Physics-PHYS201-20786-2019FA https://cerritos.instructure.com/courses/36754/quizzes/72494 11/19 3 / 3 pts Question 19 The figure shows a 100-kg block being released from rest from a height of 1.0 m. It then takes it 0.90 s to reach the floor. What is the mass m of the other block? The pulley has no appreciable mass or friction. 60 kg Correct! Correct! 54 kg 42 kg 48 kg 3 / 3 pts Question 20 In the figure, a block of mass M hangs at rest. The rope that is fastened to the wall is horizontal and has a tension off 52 N. The rope that is fastened to the ceiling has a tension of and makes an angle θ with the ceiling. What is the angle θ ?

9/28/2019 Exam 2: Engineering Physics-PHYS201-20786-2019FA https://cerritos.instructure.com/courses/36754/quizzes/72494 12/19 55° Correct! Correct! 45° 35° 63° 30° 3 / 3 pts Question 21 A car enters a 300-m radius horizontal curve on a rainy day when the coefficient of static friction between its tires and the road is 0.600. What is the maximum speed at which the car can travel around this curve without sliding? 42.0 m/s Correct! Correct! 37.9 m/s 29.6 m/s 24.8 m/s

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9/28/2019 Exam 2: Engineering Physics-PHYS201-20786-2019FA https://cerritos.instructure.com/courses/36754/quizzes/72494 13/19 33.1 m/s 3 / 3 pts Question 22 A 600-kg car is going around a banked curve with a radius of 110 m at a speed of . What is the appropriate banking angle so that the car stays on its path without the assistance of friction? 56.2° 60.9° 29.1° Correct! Correct! 13.5° 33.8° 1 / 1 pts Question 23 The figure shows two forces acting on an object, with magnitudes and What third force will cause the object to be in equilibrium (acceleration equals zero)? 52 N pointing down Correct! Correct! 82 N pointing down

9/28/2019 Exam 2: Engineering Physics-PHYS201-20786-2019FA https://cerritos.instructure.com/courses/36754/quizzes/72494 14/19 82 N pointing up 52 N pointing up 3 / 3 pts Question 24 Two men, Joel and Jerry, push against a wall. Jerry stops after 10 min, while Joel is able to push for 5.0 min longer. Compare the work they do. Both men do positive work, but Jerry does 50% more work than Joel. Both men do positive work, but Joel does 75% more work than Jerry. Both men do positive work, but Joel does 50% more work than Jerry. Both men do positive work, but Joel does 25% more work than Jerry. Neither of them does any work. Correct! Correct! 3 / 3 pts Question 25 Two objects, one of mass m and the other of mass 2 m , are dropped from the top of a building. When they hit the ground. (ignore air resistance) the heavier one will have four times the kinetic energy of the lighter one. both of them will have the same kinetic energy. the heavier one will have twice the kinetic energy of the lighter one. Correct! Correct! the heavier one will have times the kinetic energy of the lighter one.

9/28/2019 Exam 2: Engineering Physics-PHYS201-20786-2019FA https://cerritos.instructure.com/courses/36754/quizzes/72494 15/19 3 / 3 pts Question 26 A force = 12 N - 10 N acts on an object. How much work does this force do as the object moves from the origin to the point 37 J 46 J Correct! Correct! 266 J 62 J 3 / 3 pts Question 27 A force on a particle depends on position such that F( x ) = (3.00 N/m ) x + (6.00 N/m) x for a particle constrained to move along the x-axis. What work is done by this force on a particle that moves from to ? 2 2 10.0 J 20.0 J Correct! Correct! 48.0 J 24.0 J -48.0 J 3 / 3 pts Question 28

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9/28/2019 Exam 2: Engineering Physics-PHYS201-20786-2019FA https://cerritos.instructure.com/courses/36754/quizzes/72494 16/19 You carry a 7.0 kg bag of groceries above the level floor at a constant velocity of 75 cm/s across a room that is room. How much work do you do on the bag in the process? 134 J 0.0 J Correct! Correct! 82 J 158 J 3 / 3 pts Question 29 It requires 49 J of work to stretch an ideal very light spring from a length of 1.4 m to a length of 2.9 m. What is the value of the spring constant of this spring? 29 N/m 15 N/m Correct! Correct! 44 N/m 22 N/m 3 / 3 pts Question 30 A student slides her 80.0-kg desk across the level floor of her dormitory room a distance 4.00 m at constant speed. If the coefficient of kinetic friction between the desk and the floor is 0.400, how much work did she do?

9/28/2019 Exam 2: Engineering Physics-PHYS201-20786-2019FA https://cerritos.instructure.com/courses/36754/quizzes/72494 17/19 3.14 kJ 26.7 J 1.26 kJ Correct! Correct! 24.0 J 128 J 3 / 3 pts Question 31 In the figure, a 900-kg crate is on a rough surface inclined at 30°. A constant external force is applied horizontally to the crate. While this force pushes the crate a distance of 3.0 m up the incline, its velocity changes from 1.2 m/s to 2.3 m/s. How much work does friction do during this process? -7200 J +7200 J -3700 J Correct! Correct! +3700 J zero

9/28/2019 Exam 2: Engineering Physics-PHYS201-20786-2019FA https://cerritos.instructure.com/courses/36754/quizzes/72494 18/19 3 / 3 pts Question 32 The work performed as a function of time for a process is given by where What is the instantaneous power output at 69 W 99 W Correct! Correct! 208 W 139 W 3 / 3 pts Question 33 A traveler pulls on a suitcase strap at an angle 36° above the horizontal. If of work are done by the strap while moving the suitcase a horizontal distance of 15 m, what is the tension in the strap? 92 N 75 N Correct! Correct! 85 N 61 N 3 / 3 pts Question 34 In the figure, a constant external force P = 160 N is applied to a 20.0-kg box, which is on a rough horizontal surface. While the force pushes the box a distance of 8.00 m, the speed changes from 0.500 m/s to 2.60 m/s. The work

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9/28/2019 Exam 2: Engineering Physics-PHYS201-20786-2019FA https://cerritos.instructure.com/courses/36754/quizzes/72494 19/19 done by friction during this process is closest to +1110 J. +1170 J. -1170 J. -1040 J. Correct! Correct! +1040 J. Quiz Score: 97 out of 100

Exam 2_ Engineering Physics-PHYS201-20786-2019FA

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