# prob02 - S ET 2 G ENERAL S CIENCE 121 S UMMER 2011 5. What...

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Instructions Complete the following exercises in class on Tuesday, May 17. Feel free to work together in groups or to consult with your instructor. These exercises are for your bene±t and need not be turned in. Make sure you understand all of the material! 1. A) The diagram below shows the position at intervals of 0.1 seconds of a ball moving left to right (as in a photograph taken with a stroboscope that ²ashes every tenth second). Is the ball accelerated? Explain. B) The diagram below shows the positions at intervals of 0.05 seconds of two balls moving left to right. Are either of these balls accelerated? Explain. 2. What is the acceleration of a car that moves from rest to 15 m/s in 10 s? 3. How long would be required for a car to go from a speed of 20 m/s to a speed of 25 m/s if the acceleration is 3 m/s 2 ? 4. What is the resulting acceleration when a force of 100 N is applied to a 5 kg object? Summer 2011 1 Problem Set 02 P ROBLEM

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Unformatted text preview: S ET 2 G ENERAL S CIENCE 121 S UMMER 2011 5. What is the weight of a 70 kg person? 6. Two astronauts in space push off against each other. One astronaut is twice the mass of the other. Describe their relative speeds after they separate. 7. A car is resting on a level surface. The car experiences a gravitational force downward equal to its weight. Explain why the car is not moving. 8. Two identical pieces of paper, one crumpled into a ball and another left Fat, are released simultaneously from the same height above the Foor. Which one if either reach the Foor rst? Explain this in the context of Newtons laws. 9. An expert marksman looks through his scope at a target and aims exactly for the bullseye. Is he likely to hit it and if not in what direction would he likely miss it? 10. Hanging a mass of 1 kg on a certain spring causes its length to increase 0.2 m. What is the spring constant of the spring? Summer 2011 2 Problem Set 02...
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## This note was uploaded on 05/23/2011 for the course GSCI 121 taught by Professor Niculescu,m during the Summer '08 term at James Madison University.

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prob02 - S ET 2 G ENERAL S CIENCE 121 S UMMER 2011 5. What...

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