A car speeds up as it rolls down a hill. which is this an example of? positive acceleration negative acceleration relative veloc
2 answers:
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Answer:
Explanation:
60000 kJ / h = 60000 x 1000 / (60 x 60 )
= 16667 J /s
a)
where and
are heat supplied and heat given from outside source .
Here = 16667 J/s
= 15.684
16667 / W = 15.684
W= minimum power supplied = 1062.7 W.
b )
If
=19.87
= 838.8 W .
The ball's vertical velocity at the time it just passes over the goal is 0 m/s. Its initial vertical velocity is unknown and we denote it by , where
here is the ball's initial speed. Vertically, the only force acting on the ball is gravity, which attributes a downward acceleration of 9.8 m/s^2. We expect the maximum height achieved by the ball to be 2.4 m, so we can find the initial speed by solving