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Author Question: What is the minimum energy needed to lift a 1.0-kg rocket to a height of 200 km and to give it a ... (Read 163 times)

ARLKQ

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on: Jul 29, 2018
What is the minimum energy needed to lift a 1.0-kg rocket to a height of 200 km and to give it a speed of 8.0 km/s at that height? (Neglect air resistance and the small decrease in g over that distance.)
 
  A) 34 kJ B) 34 MJ C) 34 J D) 34 TJ E) 34 GJ

Question 2

A slanted roof rises at 35 above the horizontal, and the straight-line distance from the top of the roof to the bottom edge is 4.5 m. The roof is covered with ice, so it offers no friction to objects sliding on it.
 
  A piece of ice at the top suddenly breaks loose and begins to slide down from rest. (a) How long will it take for the ice to reach the bottom edge of the roof? (b) How fast will the ice be traveling just as it reaches the bottom edge?


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daiying98

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Reply #1 on: Jul 29, 2018
Answer to Question 1

B

Answer to Question 2

(a) 1.3 s (b) 7.1 m/s


ARLKQ

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Reply 2 on: Jul 29, 2018
Wow, this really help

yeungji

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Reply 3 on: Yesterday
Great answer, keep it coming :)

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