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Paha777 [63]
3 years ago
7

Barbara pushes her friend Sharon on a skateboard. Barbara applies a force of 225 N and Sharon's acceleration is 2.3 m/s2. What i

s the combined mass of Sharon and her skateboard?
Physics
2 answers:
saw5 [17]3 years ago
5 0

Answer:

98 kg

Explanation:

A P E X

Gnesinka [82]3 years ago
3 0
F = m*a
(Force) = (mass x acceleration)

1)     Plug the numbers into the corresponding variables using parentheses:

(225) = m*(2.3)

2)     Divide 2.3 on each side so that  the variable and the numbers are not separate sides 

225/2.3 = m* 2.3/2.3
97.83 = m

3)     Rewrite your answer.

The combined mass of Sharon and her skateboard is 97.83 kg. 
(Remember that kg or kilograms is the proper SI Unit for mass)\

Hope this helps!! 



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A 75-kg sprinter accelerates from rest to a speed of 11.0 m/s in 5.0 s. (a) calculate the mechanical work done by the sprinter d
mezya [45]

The mechanical work done by the sprinter during this time will be 4537.5 J , the average power the sprinter must generate will be 907.5 W and if the sprinter converts food energy to mechanical energy with an efficiency of 25% then he will be burning calories at 54.20 calories per second.

Work in physics is the energy that is transferred to or from an item when a force is applied along a displacement. It is frequently described in its most basic form as the result of force and displacement.

The quantity of energy moved or transformed per unit of time is known as power in physics. The watt, or one joule per second, is the unit of power in the International System of Units.. A scalar quantity is power.

Given 75-kg sprinter accelerates from rest to a speed of 11.0 m/s in 5.0 s.

So let,

m = 75 kg

v = 11.0 m/s

t = 5.0 s

So the mechanical work done by the sprinter during this time will be as follow:

W = 0.5 mv²

W = 0.5 (75)(11)²

W = 4537.5 J

The average power the sprinter must generate will be as follow:

Power(P) = W / t

P =  4537.5/5

P = 907.5 W

Only 25% is absorbed. So, the sprinter only absorbed 226.875 J per second which is equal to 54.20 calories per second.

Hence   mechanical work done by the sprinter during this time will be 4537.5 J , the average power the sprinter must generate will be 907.5 W and if the sprinter converts food energy to mechanical energy with an efficiency of 25% then he will be burning calories at 54.20 calories per second.

Learn more about mechanical power here:

brainly.com/question/25573309

#SPJ10

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In the diagram of the earth’s interior, which part causes the diffraction of P waves made by earthquakes?
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D

Explanation:

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The displacement of a car is a function of time as follows: x(t)=25+3.0t², with x is in meters. Find the average velocity betwee
aniked [119]

Answer: 15m/s

Explanation: <u>Average</u> <u>Velocity</u> is vector describing the total displacement of an object and the time taken to change its position. It is represented as:

v=\frac{\Delta x}{\Delta t}

At t₁ = 1.0s, displacement x₁ is:

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Then, average speed is

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The average velocity of a car between t₁ = 1s and t₂ = 4s is 15m/s

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