Given that,
Electrical energy of the motor = 2280 J
Kinetic energy = 1606 J
Wasted energy in thermal and sound energy = 550 J
To find,
The efficiency of the motor in percent.
Solution,
Efficiency is defined as the ratio of useful output energy to the total energy.
Total energy = 2280 J
Useful energy = 1606 J
So, the efficiency of the motor is 70.43%.
Answer:
Explanation: By using Gas Law, the new pressure can be calculated as follows:
Gas law states:
Using (1), and Identifying the knowns and unknowns, and plugging in (1) we get the following results:
Finally, the New pressure is calculated as follows:
Her weight doesn't change but thats only simply because there is no gravity in space.
a) Change in Kinetic energy = Work Done
We require Normal Force N,
N + 188 X sin(28.6 ) - m x g = 0
so N = m x g - 188 x sin(28.6)
= 19.7 Kg x 9.8m/s^2 - 188 x sin(28.6)
= 19.7 Kg x 9.8m/s^2 - 188 x 0.478
= 193.06 Kg.m/s^2 - 89.864 N
= 103.196 N
Wvertical = F*x = μ X 103.196 x 48.7 = 0.103 X 103.196 x 48.7
= 517.641 N
Whorizontal = F*x = F x cos(28.6 ) x 48.7
= 188 x cos(28.6 ) x 48.7
= 188 x 0.877 x 48.7
= 8029.46 J
b) V^2 = U^2 + 2 x a x s
V = (2 x a x s)^0.5
= 13.486 m/s
i just took the test, the answer is d. 320 kilowatt-hours