A police officer is chasing a purse-snatcher down a street. The thief
1 answer:
Answer:
3 seconds
Explanation:
We can give an expression for the position of both the thief and of the police officer at time t.
The position of the thief at time t is given by
where 9 is its initial position in m and 5 is its speed in m/s.
Instead, the position of the police officer at time t is given by
where 0 is its initial position in m and 8 is its speed in m/s.
The police officer will catch the thief when their position will be equal, so
By solving,
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Answer:
P = 1097 Watt
Explanation:
given,
length of stairs, L = 130 m
inclination with horizontal,θ = 30°
mass of the football player = 105 Kg
time = 61 s
we know,
Work = change in Potential energy
h = L sin 30°
h = 130 x 0.5
h = 65 m
W = m g h
W = 105 x 9.8 x 65
W = 66885 J
now,
P = 1097 Watt
hence, the power output on the way is 1097 W
Answer:
The free body diagram is attached.
Explanation:
A force of 31[N] to the east, the second force goes to the south and it is equal to 28[N], the third force goes to the west and it is equal to 39 [N].
We can consider the crate as a particle. And all the forces are acting over the particle.
