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drek231 [11]
3 years ago
10

4. A weightlifter raises a mass mat a constant speed to a height h in time t. Which of the following

Physics
1 answer:
marishachu [46]3 years ago
3 0

Answer:

<h3>a. mgh</h3>

Explanation

The work done by the lifter is equal to its potential energy since he is covering a height and under the influence of gravity.

potential energy = mass * acceleration due to gravity * height

m is the mass

g is the acceleration due to gravity

h is the height

Hence the required workdone = PE = mgh

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During a workout, the football players at State U ran up the stadium stairs in 61 s. The stairs are 130 m long and inclined at a
NeTakaya

Answer:

  P = 1097 Watt

Explanation:

given,

length of stairs, L = 130 m

inclination with horizontal,θ = 30°

mass of the football player = 105 Kg

time = 61 s

we know,

Power = \dfrac{work}{time}

Work = change in Potential energy

 h = L sin 30°

 h = 130 x 0.5

 h = 65 m

W = m g h

W = 105 x 9.8 x 65

W = 66885 J

now,

P = \dfrac{66885}{61}

  P = 1097 Watt

hence, the power output on the way is 1097 W

5 0
3 years ago
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Fiesta28 [93]

Answer:

Law of multiple proportions

8 0
3 years ago
6300 divided by 32.8
Ilya [14]
<h2>6300÷32.8</h2><h3>=192.07317073</h3>

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please mark this answer as brainlist

7 0
3 years ago
Read 2 more answers
At what height does a 1000-kg mass have a potential energy of 1J relative to the ground? Be sure to show all work to support you
nikdorinn [45]
Potential energy = (mass) x (gravity) x (height)

       1 joule  =  (1,000 kg) x (9.8 m/s²) x (height)

       Height =  1 joule / (9,800 newtons)

                   =  1/9800 meter

                   =  0.000102 meter

                   =   0.102 millimeter    (rounded) 
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The correct response is B .

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