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Each pulley reduces the extra effort compulsory to lift the
elephant (light and 100% efficiency). If the elephant "weighs" 27,800
N and the person can apply 700 N,
27,800 / 700 = 39.7 which is about 40 N.
The answer that offers a combined # of 40 pulleys is computed by:
40 / 2 = 20
Therefore the answer is 20 fixed and 20 moveable.
Answer:
a). 1.28333 seconds
b). 186.66 seconds
Explanation:
a). Given :
Distance between the earth and the moon, d = m
Speed of the radio waves, c = m/s
Therefore the time required for the voice of Neil Armstrong to reach the earth via radio waves is given by :
= 1.28333 seconds
b). Distance between Mars and the earth, d = m
Speed of the radio waves, c = m/s
So, the time required for his voice to reach earth is :
= 186.66 seconds
Solid and liquids are much more denser than gas because their molecules are close to each other and with that the molecules of them can't move that freely unlike the gas molecules. Also, because of being near to each other the molecules of solid and liquids became heavy making them dense.
Answer:
Explanation:
The total force exerted by the man on the chair is equal to his weight:
where m=95.0 kg is the man's mass and g=9.8 m/s^2. Substituting,
Since there are 4 legs, we can assume that the force is equally distributed over the 4 legs; so the force supported by each leg is
The radius of each leg is , so the area of each leg is
And the pressure exerted on each leg is equal to the ratio between the force supported by each leg and the area: