Answer:
The efficiency of the system is 63.7 %
Explanation:
Given;
input power of the motor, = 1.5 kW = 1,500 W
mass of the car lifted, m = 1300 kg
height through which the car was lifted, h = 1.8 m
time, t = 24 s
The output power of the motor is calculated as;
Output Power = F x v
= (mg) x (d/t)
= (1300 x 9.8) x (1.8 / 24)
= 12,740 x 0.075
= 955.5 W
The efficiency of the system is calculated as;
![E = \frac{0utput \ power}{1nput \ power} \times \ 100\%\\\\E = \frac{955.5}{1500} \times \ 100\% \\\\E = 63.7 \ \%](https://tex.z-dn.net/?f=E%20%3D%20%5Cfrac%7B0utput%20%5C%20power%7D%7B1nput%20%5C%20power%7D%20%5Ctimes%20%5C%20100%5C%25%5C%5C%5C%5CE%20%3D%20%5Cfrac%7B955.5%7D%7B1500%7D%20%5Ctimes%20%5C%20100%5C%25%20%5C%5C%5C%5CE%20%3D%2063.7%20%5C%20%5C%25)
The correct answer is 63.7%
Free fall means rapid fall or a downward motion due to gravity. Sentence example: When Joe was accidentally bumped by Sarah, he was sent towards a free fall down the escalator, leading to a serious injury on his arm and two legs.
≈ 746 watts is a 1 Horsepower, because that's in the SI base unit.
You can observe this law in practice if <span>a ray of light reflects off of a flat mirror.
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Law of reflection states that both direction of both incoming and outgoing rays of light make the same angle with respect to surface normal.
Answer:
410 nanometers
Violet light is electromagnetic radiation with wavelengths of 410 nanometers and red light has a wavelength of 680 nanometers. The nanometer is a unit of distance in the metric scale and is abbreviated as nm. One nanometer (nm) equals one thousand millionths of a meter (m) or 1 nm = 10-9 m.
Explanation:
Hope it helps! Correct me if I am wrong :>