How can one find the mechanical advantage of a pulley?

If you measure the amount of work accomplished in a particular time interval, u have measured-

Explain Hardy-Weinberg equilibrium and why it is so important, especially since all of its assumptions seem so unrealistic and difficult to meet.

What forces are acting on matter through contact or no contact

Why does middle c on an oboe sound different then a middle c played on a piano

before colliding, the momentum of block A is + 15.0 kg m/s. after, block A has a momentum - 12.0 kg*m/s. what is the momentum of block B afterwards

April swims 50 m north and then turns and swims 20 m back to the south. What is her velocity if it takes her 60 seconds?

All the colors of visible light can combine to form white light. a. True b. False

If the results of a study do not support a hypothesis, it means that the experiment failed.

How does a rubber band obey the law of conservation of energy?

Shane observes that an upward force pushes him up when he sits on a chair. Based on his observation which statement is correct Friction can act at a distance. Normal force can act at a distance. The chair applies a non-contact force called friction.