# Exam 2 - Exam 2 Physics Points Awarded 48.00 Points Missed...

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Unformatted text preview: Exam 2 Physics Points Awarded 48.00 Points Missed 2.00 Percentage 96.0% 1. A certain crane can provide a maximum lifting force of 25 000 N. I t hoists a 2000-kg load starting at ground level by applying the maximum force for a 2-second interval; then, it applies just sufficient force to keep the load moving upward at constant speed. Approximately how long does it take to raise the load from ground level to a height of 30 m? a. 2 s b. 5 s c. 7 s d. 9 s e. 10 s http://www.siue.edu/~tfoster/PhysCont/Mech2007.pdf 27. A certain crane can provide a maximum lifting force of 25 000 N. It hoists a 2000-kg load starting at ground level by applying the maximum force for a 2-second interval; then, it applies just sufficient force to keep the load moving upward at constant speed. Approximately how long does it take to raise the load from ground level to a height of 30 m? (a) 2 s (c) 7 s (e) 10 s (b) 5 s (d) 9 s 2. A 44-kg child steps onto a scale and the scale reads 430 N. What is the magnitude of the normal force acting on the child? a. 44 N b. 215 N c. 430 N d. 645 N e. 860 N http://east.maine207.org/assets/3/news/Phys_Accel_Review_Packet.pdf 69. A 44-kg child steps onto a scale and the scale reads 430 N. What is the magnitude of the normal force acting on the child? (a) 44 N (c) 430 N (e) 860 N (b) 215 N (d) 645 N 3. Complete the following statement: The term net force most accurately describes: a. the mass of an object b. the inertia of an object-inertia is the natural tendency of an object to remain at rest or in motion at a constant velocity. The mass of an object is a quantitative measure of inertia. c. the quantity that causes a displacement d. the quantity that keeps an object moving e. the quantity that changes the velocity of an object-???? Check online TEXT page 88: The net force is the vector sum of all forces acting simultaneously on a body. The purpose served when a net force acts on an object is NOT to sustain the objects velocity, but rather to change it. http://www.ahsd.org/science/stroyan/pl2/ch4/ch4wq/p2ch4wq1.htm 2. Complete the following statement: The term net force most accurately describes A. B. the inertia of an object. C. the quantity that causes displacement. D. the quantity that keeps an object moving E. the quantity that changes the velocity of 4. The worlds largest ferris wheel with a radius of 50.0 m is located in Yokohama City, Japan....
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## This note was uploaded on 07/24/2010 for the course PHYSICS ph205 taught by Professor Brumm during the Spring '10 term at Grantham.

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Exam 2 - Exam 2 Physics Points Awarded 48.00 Points Missed...

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