13. A bicycle with a rider weighi needed to change the speed of the bicycle? ng

Question

13. A bicycle with a rider weighi needed to change the speed of the bicycle? ng 5o kg accelerates from 3 m/s to 5 m/s in 10 seconds. What is the average force a. 0.5 N b. 1.0 N c. 1.5 N d. 4.9 N e. 9.8N astronaut is a short distance away from her space station without a tether rope. She has a large wrench. What should she do with the wrench to move toward the space station. a. Throw it directly away from the space station b. Throw it directly toward the space station c. Throw it toward the space station without letting go of it. d. Throw it parallel to the direction of the station's orbit. e. Throw it opposite to the direction of the station's orbit 15. A freight car with a mass of 10,000 kg is coupled with a tanker car of 7,500 kg. If the freight car is moving at 10 m/s before the cars are coupled, what is the velocity of the cars after they are coupled together? a. 10 m/s b. 6.14 m/s .5.93 m/s d. 5.71 m/s e. 5 m/s and Coupling 16. Large container ships stop their engines as much as 25 km from port. Why? a. To allow the engine crew time to shower before disembarking on shore To allow the friction of the water decrease the momentum of the ship. To reverse the engines prior to docking. To save money To allow time for the pilots from shore to board the ship as it enters the harbor. b. c. d. e.

Explanation / Answer

13) using v= u+at

5 -3 = a*10

a=0.2 m/s2

force, f= ma= 50*0.2 = 10 N

option e is correct

14) option e is correct

because throwing it away from the orbit of the space station, she herself will move towards the orbit of the space station due to the conservation of momentum.

15) using conservation of momentum

10000*10 + 7500 = (10000+7500)*v

v=5.71 4 m/s

option d is correct

16) option b is correct

the friction due to water will slow the ship down

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