Adoorknob makes it easier to twist a door latch in or out. how does a doorknob do this?
a.
by reducing the distance over which the input force is applied

b.
by decreasing the amount of input force needed to move the latch

c.
by increasing the amount of input force needed to move the latch

d.
by changing the direction of the input force

Abatter hits the baseball a with an initial velocity of v0 = 110 ft/sec directly toward fielder b at an angle of 23° to the horizontal; the initial position of the ball is 2.2 ft above ground level. fielder b requires 0.44 sec to judge where the ball should be caught and begins moving to that position with constant speed. because of great experience, fielder b chooses his running speed so that he arrives at the “catch position” simultaneously with the baseball. the catch position is the field location at which the ball altitude is 8.4 ft. determine the velocity of the ball relative to the fielder at the instant the catch is made.

What is hidden during a lunar eclipse? isn't the moon hidden?

Aforce of 34n stretches a very light ideal spring 0.73 m from equilibrium, what is the force constant (spring constant) of the spring? (a) 47n/m (b) 38n/m (c) 53n/m (d) 25n/m