3 years ago

Which of the following is the best explanation of work?

Physics

1 answer:

Zepler [3.9K]3 years ago

5 0

Answer:

Explanation:

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A typical male sprinter can maintain his maximum acceleration for 2.0 s, and his maximum speed is 10 m/s. After he reaches this

baherus [9]

20 characters longer later and woah

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Which of the following is the best example of kinetic energy? A book sitting on a bookshelf A golfer preparing to putt the ball

Phantasy [73]

sorry if im wrong but

D. A satellite orbiting the Earth.

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3 years ago

Read 2 more answers

a) What is the average useful power output of a person who does6.00×10^6Jof useful work in 8.00 h? (b) Working at this rate, how

NARA [144]

Answer:

208.33 W

141.26626 seconds

Explanation:

E = Energy = $6\times 10^6\ J$

t = Time taken = 8 h

m = Mass = 2000 kg

g = Acceleration due to gravity = 9.81 m/s²

h = Height of platform = 1.5 m

Power is obtained when we divide energy by time

$P=\frac{E}{t}\\\Rightarrow P=\frac{6\times 10^6}{8\times 60\times 60}\\\Rightarrow P=208.33\ W$

The average useful power output of the person is 208.33 W

The energy in the next part would be the potential energy

The time taken would be

$t=\frac{E}{P}\\\Rightarrow t=\frac{mgh}{208.33}\\\Rightarrow t=\frac{2000\times 9.81\times 1.5}{208.33}\\\Rightarrow t=141.26626\ s$

The time taken to lift the load is 141.26626 seconds

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Why do we need body membrane

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So we have a structured form, but can still move. If we had a cell wall we would be stiff objects since it’s just a cell membrane we can still have movement

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A satellite at a particular point along an elliptical orbit has a gravitational potential energy of 4700 MJ with respect to Eart

erastovalidia [21]

during satellite motion we know that total energy is always conserved

so here we will have

$KE_i + PE_i = KE_f + PE_f$

here we know that

$KE_i = 4800 MJ$

$PE_i = 4700 MJ$

now at other position

$PE_f = 6000 MJ$

now from above equation we have

$4800 +4700 = 6000 + KE$

now we have

$9500 = 6000 + KE$

$KE = 9500 - 6000 = 3500 MJ$

so its kinetic energy will be 3500 MJ

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3 years ago