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Andreyy89
3 years ago
5

An astronaut spends 3 months in space and then returns to Earth. When she returns to Earth, her muscles have weakened. This is b

ecause of the stronger gravitational force that was exerted on her muscles in space.
true or false
Physics
2 answers:
Pepsi [2]3 years ago
6 0
False. there's less gravitational force in space than on earth
SIZIF [17.4K]3 years ago
3 0
False. Her muscles weakened because of the WEAKER force of gravity in space. Muscles are one of those things that if you don't yoozum, you loozum. Your brain is another one.
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un motor electric efectueaza un lucru mecanic de 864 j in 0.5 min.tensiunea la bornele sale este de 12v si este parcurs de un cu
GrogVix [38]

Answer:

96%

Explanation:

To find the values of the motor efficiency you use the following formula:

E=\frac{P_o}{P_i}100

P_o: output power = 864J/0.5min=864J/30s=28.8W

P_i: input power = I*V = (3A)(12V) = 36W

By replacing this values you obtain:

E=\frac{28.8W}{30W}*100=96\%

hence, the motor efficiency is about 96%

traslation:

Pentru a găsi valorile eficienței motorului, utilizați următoarea formulă:

P_o: putere de ieșire = 864J / 0.5min = 864J / 30s = 28.8W

P_i: putere de intrare = I * V = (3A) (12V) = 36W

Înlocuind aceste valori obțineți:

prin urmare, eficiența motorului este de aproximativ 96%

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