Astronauts appear weightless while working in the International Space Station because A)they are in a state of free fall.
B)there isn't any gravity in outer space.
C)they have very little mass when in outer space.
Eliminate
D)they have gravitational attractions to the sun and moon

Many machines- including inclined planes such as ramps- increase the strength of the force put into the machine but decrease the distance over which the force is applied.

The image shows a pendulum in simple harmonic motion the pendulum starts at a and swing to e

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