6. 7. A 10,000.0-kg object and a 15,000.0-kg object are positioned such that the
ID: 807699 • Letter: 6
Question
6.
7.
A 10,000.0-kg object and a 15,000.0-kg object are positioned such that
their centers are 2,500.0 m apart. What is the gravitational force between
the objects? (G = 6.674 ? 10?11 N(m/kg)2)
9
he distance between the molecules in flask B is two times greater than the distance between the molecules in flask A. How does the gravitational force between the molecules in the flasks compare?
11.
A 240-kilogram quarterback catches a football while he is stationary. An
80-kilogram opponent runs toward him at 2 m/s and tackles him. After the collision, the quarterback travels backward at 1 m/s. What is the final velocity of the opponent?
12.
Kathy is driving her 1,000-kilogram car at 20 m/s and does not notice that a dump truck has stopped in front of her. She rear-ends the 3,000-kilogram truck. After the collision, Kathy bounces back at ?10 m/s. What is the final velocity of the dump truck?
18.
Pablo and Hugo live on the same street. Pablo stands in front of his house and sounds an air horn and raises his arm at the same time. Hugo stands in front of his house and starts a stopwatch when he sees Pablo's arm go up. He stops it when he hears the air horn. The stopwatch shows a time of 1.2 seconds. The speed of sound is about 340 m/s. About how far apart are their houses?
20.
A cue ball moves forward with a momentum of 2 kg?m/s toward a billiard ball whose momentum is 0 kg?m/s. After the collision, the cue ball stops and the billiard ball travels forward.
What is the billiard ball's momentum after the collision?
21.
Georg wants to figure out how long it will take to walk to a nearby town that is thirteen kilometers away. He takes three short walks around his neighborhood and records the results in the table shown below.
About how long will it take Georg to walk to the nearby town?
21.
Adam and Krystal are pulling their little brother in a sled up a snow-covered hill. If Adam is pulling north with a force of 120 N and the net force is 200 N north, with how much force and in which direction is Krystal pulling?
Explanation / Answer
Answer
F = G*(m1m2)/r2 G= 6.673x10-11
6. r = (G(1250)2/1x10-5)1/2 = 3.229 m
7. F = G(10000*15000)/(2500)2 = 1.602x10-9 N
9. Choice D. F in flask A is four times greater than in flask B.
11. momentum of quarterback = momentum of opponent, so the answer is -1 m/s
12. 1000*(20-(-10)) = 3000*(0-vf), Vf = 10 m/s
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