practice01 - Sean T Scully - GSCI121_3_4_SP10 3 Problems...

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Unformatted text preview: Sean T Scully - GSCI121_3_4_SP10 3 Problems from the Whole Course Sean T Scully - GSCI121_3_4_SP10 3 Problems from the Whole Course Suppose that a radio signal travels through space at a speed of 3 × 108 m/s. How far does the signal travel after 29 minutes? Suppose that a radio signal travels through space at a speed of 3 × 108 m/s. How far does the signal travel after 29 minutes? Tries 0/10 The Physics of Light & Sound PRACTICE PROBLEMS Consider the velocity vs. time plot below: Click on the portion of the plot that shows constant velocity Consider the velocity vs. time plot below: Click on the portion of the plot that shows constant velocity GENERAL SCIENCE 121 SUMMER Answer Part: 1. forConvert 0 Answer 2. for Part: Convert 0 Tries 0/10 • 522000000000 [495900000000 3.6 meters into cm. ANSWER: 360 cm 548100000000] • 522000000000 Sig 0 into [495900000000 67.1 meters - 15 kilometers. ANSWER: 0.0671 km 548100000000] 3. car travels atof speed of 68x 123 written in scientific anotation is: ANSWER: 4.25 x 10-1 A The result a 0.003456 15 Sig 0 - km/h for 2 hours and then speed of 80 km/h for 1 hour.xWhat was its average speed for 4. The result of 243678 2005 written in scientific notation is: ANSWER 4.89 x 108 A trip? thecar travels at a speed of 68 km/h for 2 hours and then a speed of 80 5. What is thefor 1 hour. What was its average speed forfor a car that travels 19 km in 41 minutes? Tries 0/10 km/h average speed, in units of km/h, theANSWER: 27.8 km/h trip? Answer Tries 0/10 • 72 Part: 6. forSuppose that a[68.4 signal travels through space at a speed of 3 × 108 m/s. How far does the radio Answer 0 75.6] signal travel • 72 29 minutes? ANSWER: 5.22 x 1011 m after for Part: [68.4 Sig 0 - 15 Tries 0/10 7. 0 A car travels at 75.6] of 68 km/h for 2 hours and then a speed of 80 km/h for 1 hour. What was a speed its average speed for - 15 Consider the positionSig 0 theplot below: Click on the porvs. time trip? ANSWER: 72 km/h Tries 0/10 tion of the plot that shows constant positive 8. Considerposition vs. timevs. time plot velocitythe por- the portion of the plot that shows constant below: Consider the the position plot below: Click on Circle p of the plot that shows constant positive velocity tion ositive velocity Tries 0/10 Tries 0/10 9. Consider the velocity vs. time plot below: Circle the portion of the plot that shows constant Consider the velocity vs. time plot below: Click on the poreceleration tiondof the plot that shows constant deceleration Consider the velocity vs. time plot below: Click on the portion of the plot that shows constant deceleration 1_3_4_SP10 Course 3 10. Consider the velocity vs. time plot below: Circle the portion of the plot that shows constant velocity travels through space at a speed of Consider the velocity vs. time plot below: Click on the porTries 0/10 the plot that shows constant velocity the signal travel after 29 minutes? tion of Tries 0/10 000000 00000000 0000000] - 15 f 68 km/h for 2 hours and then a r. What was its average speed for - 15 Tries 0/10 time plot below: Click on the porconstant positive velocity Summer 1 Practice Problems 11. How long (in seconds) would be required for a car to go from a speed of 15 m/s to a speed of 30 m/s if the acceleration is 5 m/s2? ANSWER: 3 seconds 12. What is the resulting force (in N) when an object of mass 9 kg experiences a constant acceleration of 83 (in m/s2) ? ANSWER: 747 N 13. What is the weight of a 92 kg person (in N)? ANSWER: 901.6 N 14. Hanging a mass of 3 kg on a certain spring causes its length to increase 0.4 m. What is the spring constant (in N/m) of the spring? ANSWER: 73.5 N/m 15. Astronauts can jump so high on the Moon because: A) they weigh less B) there is no air resistance C) FOX tells me that was fake D) they have less mass 16. A car rounds a corner maintaining a constant speed. Which of the following is true? A) there is a normal force due to the curve B) there is no force because the speed is constant C) there are lots of forces acting on the car that make it appear to move a constant speed D) there is a force because the velocity changes since the direction changes 17. Two equal forces act on two different objects. The first force acts on an object that has 10 times the mass of the other. We can then say that its resultant acceleration is A) 1/10 times that of the less massive object B) exactly the same as the less massive object C) there is not enough information to draw conclusions about the objects’ accelerations D) 10 times that of the less massive object 18. Using a block and tackle, I lift a 20 kg crate until it is suspended 8 m above the floor. How much potential energy will it contain? ANSWER: 1568 J 19. I toss a 0.05 kg ball straight up into the air. When I release it, it has a speed of 9.2 m/s. What height above the release point in meters will the ball achieve? ANSWER: 4.3 m 9 20. A Sean T Scully - GSCI121_3_4_SP10at 44 m/s. What is its kinetic energy in Joules? ANSWER: 1.36 x 1400 kg car is traveling Homework #3 6J 10 Consider the situation illustrated below. If the block of A pendulum on the Earth’s m = 5 kg of length 0.2 21. Consider the situation illustrated below. If the block of mass surface has a bobslides down the incline mass m = 5 kg slides down incline from a height his= 10 m,the the bottom (in height at the What is the (in m/s)? what is from speed its a m/s)? m. bottom natural frequency in Hz of this system? h = 10 m, what its speed at Tries 0/10 Answer for Part: 0 • 1.11408554267107 [1.05838126553752 1.16978981980462] Sig 0 - 15 Most grandfather clocks have a pendulum that ticks each second. The clock ticks with each swing meaning that each tick is 1/2 of its total period. What length of pendulum is required to produce this periodic motion? Tries 0/10 Answer for Part: 0 •1 [0.95 ANSWER: 14 m/s 1.05] Tries 0/10 Sig Answer 22. A spring of spring constant k = 44 N/m is compressed 0.1 0m. 15 How much potential energy is it • 14 for Part: [13.3 NSWER: 0.22 J storing in Joules? A 0 14.7] Sig 0 - 15 A spring of spring constant k = 44 N/m is compressed 0.1 m. How much potential energy is it storing in Joules? Summer 0/10 Tries Answer for Part: 0 2 • 0.22 [0.209 0.231] Sig 0 - 15 Practice Problems 23. A mass-spring system has a frequency of 0.8 Hz. What is the period of the system in seconds? ANSWER: 1.25 s 24. A mass-spring system consists of a spring of spring constant k = 90 N/m and a mass attached to the spring of mass m = 1.9 kg. What is the natural frequency in Hz of this system? ANSWER: 1.1 Hz. Summer 3 Practice Problems ...
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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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