Short Answer. 11. Two identical masses are connected to identical strings.The en

Question

Short Answer.

11. Two identical masses are connected to identical strings.The end of one string is wrapped around a bicycle wheel, andthe other is wrapped around a solid disk, as shown in the figureto the right. The wheel and the disk have the same mass andsame radius. The two masses are released from rest at the sametime. Which mass reaches the ground first? Why?

12. A spacecraft traveling from Earth to Mars, which has a mass that is only 11% of Earth’s. Atsome distance in between the two planets, the gravitational pull on the spacecraft from the Earthwill be equal to the gravitational pull due to Mars. Will this distance be closer to Earth, exactlyhalfway between the two planets, or closer to Mars?

closer to Earth exactly halfway closer to Mars

Explain.

Explanation / Answer

1. Since hoop has larger moment of inertia it would take more time for mass to reach to earth. so disk would reach earlier.

2. Gravitation pull = Gm1m2/r^2 since mass of earth > mass of mars so gravitational pull to be same it should be closer to mars.

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