1.The acceleration of gravity on the moon is g=1.63 m/sec^2. What would be the weight of a 5 kg mass on the earth and on the moon? What would be the weight of a 160 lb man on the moon?
2.What net external force is required to accelerate a 1500kg automobile from rest to a speed of 100km/hr in 10 seconds?
Homework help please!!!?
2014-02-10 10:03 pm
回答 (2)
2014-02-10 10:09 pm
✔ 最佳答案
1) on the moon5kg on earth: 5kg * 9.8m/s^2 = 49 newtons.
5kg on moon: 5kg * 1.63 m/sec^2 = 8.15 newtons.
160lbs on earth is 160lbs.
160lbs mass on moon is (160 * 1.63/9.8) = 26.612 lbs
2) F = m x a
F = 1500kg x (100km/hr*1000m/km * 1hr/3600seconds / 10 seconds)
F = 4167 newtons.
2014-02-11 6:28 am
I do not agree with the answer to the second part of (1). Here the mass of the man is 160 lb. Since 'g' is given in m/sec^2 so one has to convert lb into Kg and then multiply by "g'. Since 1 lb = 0.453 kg so 160 lb will be = 160 x 0.453 = 72.57 kg. So the weight of the man on moon will be 72.57 x 1.63 = 118.296 N.
Correct me if I am wrong.
Correct me if I am wrong.
收錄日期: 2021-04-11 20:30:06
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