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machine whose officiency is 75%
is used to lift a load of 100N calculate the effort put into the machine ifit has a velocity ratio of 4​

How many neutrons does element x if it’s atomic number is 28 and its mass number is 87

Astone is thrown with a speed v0 and returns to earth, as the drawing shows. ignore friction and air resistance, and consider the initial and final locations of the stone. which one of the following correctly describes the change δpe in the gravitational potential energy and the change δke in the kinetic energy of the stone as it moves from its initial to its final location? options a.δpe = 0 j and δke = 0 j b.δpe is positive and δke is negative c.δpe = 0 j and δke is positive d.δpe is negative and δke is positive e.δpe = 0 j and δke is negative

During the past 150 years in the united states, how did energy consumption compare to population growth