Which is a result of using a machine? O The amount of work that is done is increased.
O The work input is less than the work output.
O Both the force and the distance through which it acts increase.
O The distance through which a force acts increases, and the force decreases.

Acricket ball of 70g moving with a velocity of 0.5 m/s is stopped by a player in 0.5s what is the force applied to stop the ball

Two resistors r1 and r2 may be connected either in series or parallel across an ideal battery with emf ε. we desire the rate of energy dissipation of the parallel combination to be 8.75 times that of the series combination. if r1 = 105 ω, what are the (a) smaller and (b) larger of the two values of r2 that result in that dissipation rate?

What happens to an isotope during radioactive decay?