numericwork7-18

# numericwork7-18 - TYPICAL NUMERIC QUESTIONS FOR PHYSICS I...

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TYPICAL NUMERIC QUESTIONS FOR PHYSICS I REGULAR QUESTIONS TAKEN FROM CUTNELL AND JOHNSON WORK AND ENERGY CONTENT STANDARD IV A 1. A concrete block is pulled 7.0 m across a frictionless surface by means of a rope. The tension in the rope is 40 N; and the net work done on the block is 247 J. What angle does the rope make with the horizontal? A) 28° B) 41° C) 47° D) 62° E) 88° 2. Mike is cutting the grass using a human-powered lawn mower. He pushes the mower with a force of 45 N directed at an angle of 41° below the horizontal direction. Calculate the work that Mike does on the mower in pushing it 9.1 m across the yard. A) 510 J B) 460 J C) 410 J D) 360 J E) 310 J 3. A 5.00-kg block of ice is sliding across a frozen pond at 2.00 m/s. A 7.60-N force is applied in the direction of motion. After the ice block slides 15.0 m, the force is removed. The work done by the applied force is A) 114 J B) +114 J C) 735 J D) +735 J E) +19.7 J 4. A force of magnitude 25 N directed at an angle of 37° above the horizontal moves a 10- kg crate along a horizontal surface at constant velocity. How much work is done by this force in moving the crate a distance of 15 m? A) zero joules B) 1.7 J C) 40 J D) 98 J E) 300 J 5. A 1.0-kg ball on the end of a string is whirled at a constant speed of 2.0 m/s in a horizontal circle of radius 1.5 m. What is the work done by the centripetal force during one revolution? A) zero joules B) 2.7 J C) 6.0 J D) 25 J E) 33 J Page 1

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6. Brenda carries an 8.0-kg suitcase as she walks 25 m along a horizontal walkway to her room at a constant speed of 1.5 m/s. How much work does Brenda do in carrying her suitcase?
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## This note was uploaded on 03/14/2011 for the course PHYSICS 105 taught by Professor Kruse,m during the Spring '08 term at Duke.

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numericwork7-18 - TYPICAL NUMERIC QUESTIONS FOR PHYSICS I...

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