Answer:2t
Explanation:
Given
Jason throwing watermelon at speed v and it spend t time in air
time to reach max height
0=v-gt'
and time to reach bottom is also t'
t=2t'
For guy throws his watermelon at speed 2v
So total time in air will be
t''=2t
It would be a cold wave.
Ice ages occur when the temperatures are extremely cold.(long-term)
Answer:
(a) 391 N
(b) 39.89 kg
(c) 5 m/s^2
Explanation:
Reading of scale when escalator is moving up = 591 N
Reading of scale when escalator is at rest = 391 N
Le a be the acceleration of the escalator.
(a) when the escalator is at rest, it gives the weight of person.
So, mg = 391 N
Thus, the weight of person is 391 N.
(b) Weight = m g
m = Weight / g = 391 / 9.8 = 39.89 kg
Thus, the mass of the person is 39.89 kg.
(c) As it is moving up, by using the Newton's second law
R - mg = m a
591 - 391 = 39.89 a
a = 5 m/s^2
Thus, the acceleration of the elevator is 5 m/s^2.
Power = work / time --> time = work / power = 3600 J / 275 watts = 13.1 seconds.
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