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Oksana_A [137]
3 years ago
11

A person consumes a snack containing 14 food calories (14kcal). what is the power this food produces if it is to be "burned off"

due to exercise in 6 hours? (1 cal=4.186 J).
A. 9763 W
B. 2.7 W
C. 0.6 W
D. .0027 W
Physics
2 answers:
Inessa05 [86]3 years ago
8 0

Answer:

B) 2.7W

Explanation:

Converting Cal to Joule

        1 cal = 4.186J

        14 kcal = 14 x 1000 x 4.186

                     = 58604 J

Converting hour to seconds

             6 hours = 6 x 60 x 60 seconds

                           = 21600 seconds

Power is the time rate of doing work.

Power = Work/Time

P = (58604) / (21600)

P = 2.7W

max2010maxim [7]3 years ago
7 0

Answer:

D) 0.0027

Explanation:

Power is the rate of work that is power = work/time

we are given the following:

Work = 14kcal this is equal to 58.576 J

time = 6hours this is equal to 21600 seconds

therefore:

Power = 58.576/21600 = 0.0027W

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a person with a mass of 75kg jumps on the trampoline the trampoline creates a fprce of 375n on them what is the acceleration of
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Newton's second law allows calculating the response for the person's acceleration while leaving the trampoline is:

            -4.8 m / s²

Newton's second law says that the net force is proportional to the product of the mass and the acceleration of the body

            F = m a

Where the bold letters indicate vectors, F is the force, m the masses and the acceleration

The free body diagram is a diagram of the forces without the details of the body, in the attached we can see the free body diagram for this system

 

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Body weight is

                W = mg

We substitute

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              a =\frac{F_t - m g}{m}

Let's calculate

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The negative sign indicates that the acceleration is directed downward.

In conclusion using Newton's second law we can calculate the acceleration of the person while leaving the trampoline is

            -4.8 m / s²

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