Daniah2206
15.04.2021 •
Physics
Use the earthquake magnitude scale to predict the amount and type of damage residents should expect from future earthquakes of similar magnitude.
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Ответ:
A. 1254.4 J
B. 1254.4 J
C. 43904 calories
Explanation:
Parameters given:
Mass of barbell, m = 160 kg
Length of arm, d = 0.8
A. Work done by weight lifter in lifting the barbell is:
W = F * d
Where F is force
F = m * g
=> W = m * g * d
W = 160 * 9.8 *0.8
W = 1254.4 J
B. Potential energy is given as:
PE = m * g * h
Where h is height (in this case, D)
=> PE = m * g * d
PE = 160 * 9.8 * 0.8
PE = 1254.4 J
C. The number of calories the weight lifter uses after lifting the barbell 35 times is equal to 35 times the potential energy, since a calorie is the measure of the amount of potential energy a piece of food contains:
35 * 1254.4 = 43904 calories.