A lever is being used to move a heavy stone from a garden. The stone weighs 250 newtons. The board used as a lever is 6 meters l
ong. If two of the board's meters will be used as he resistance arm how much force will be needed to move the rock?
1 answer:
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Answer:
(a) 10 s
(b) 236.5 m
(c) Kathy's speed = 47.3 m/s
Stan's speed = 42.9 m/s
Explanation:
<u>Given:</u>
= initial speed of Kathy = 0 m/s
= initial speed of Stan = 0 m/s
= acceleration of Kathy =
= acceleration of Stan =
<u>Assumptions:</u>
= final speed of Kathy when see catches Stan
= final speed of Stan when Kathy catches him
= distance traveled by Kathy to catch Stan
= distance traveled by Stan when Kathy catches him
= time taken by Kathy to catch Stan =
= time interval in which Kathy catches Stan =
Part (a):
Kathy will catch Stan only if the distances traveled by each of them are equal at the same instant.
Hence, Kathy catches Stan after 11 s from the Stan's starting times.
Part (b):
Distance traveled by Kathy to catch Stan will be distance the distance traveled by her in 10 s.
Hence, Kathy traveled a distance of 236.5 m to overtake Stan.
Part (c):
The speed of Kathy at the instant she catches Stan is 47.3 m/s.
The speed of Stan at the instant Kathy catches him is 42.9 m/s.