What happens to particles in a substance changes state
2 answers:
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Answer:
(a) Average power required to accelerate is 2.87 x 10⁴ W
(b) Average power is required to accelerate is 6.25 x 10⁴ W
Explanation:
Given :
Initial speed of car, u = 0 m/s
Final speed of the car, v = 16.4 m/s
Time, t = 4.35
Initial kinetic energy of car, K₁ = 0
Final kinetic energy of car, K₂ = (mv²)/2
Here m is the mass of the car.
Applying Work-Energy theorem,
Work done = Change in kinetic energy
W = ΔK ....(1)
Power is defined as work done per unit time. So,
P = W/t
From equation (1), the above equation becomes:
P = ΔK/t
P = (K₂ - K₁)/t
P = (mv²)/(2t) .....(2)
(a) Weight of the car, W = 9.11 x 10³ N
But, W = m x g
Here g is acceleration due to gravity.
So, m = W/g
Thus, the equation (2) becomes:
....(3)
Substitute the suitable values in the above equation.
P = 2.87 x 10⁴ W
(b) Weight of the car, W = 1.98 x 10⁴ N
Substitute this value of W in equation (3) with other suitable values.
P = 6.25 x 10⁴ W