Find the force needed to lift a 3,000 - N weight using a machine with a mechanical advantage of 15

Two billion people jump up in the air at the same time with an average velocity of 7.0 m/sec. If the mass of an average person is 60 kilograms and the mass of Earth is 5.98 * 1024 kilograms: a. What is the total momentum of the two billion people? b.

Your friend is on rollerblades holding a pendulum. You gently push her forward and let go. You observe that the pendulum first swings in the opposite direction (backward) and then returns to the vertical orientation as she coasts forward.

9. A car travels at a constant velocity of 70 mph for one hour. At the second hour, the car's velocity was 60 mph. At the third hour, the car's velocity was 80 mph.

True or false Scientific endeavor is driven by both simple curiosity as well as societal demands

The manufacturer of a bulletproof vest wants the vest to be able to stop a bullet with a mass of 0.4 kg and a velocity of 1800 m/s. what is the momentum of this bullet? a. 720 kg*m/s b. 740 kg*m/s c. 820 kg*m/s d. 4500 kg*m/s

When are magnets attracted and when are they repelled.

Dura mater location?

El Nino begins with which of the following? -upwelling of cold ocean water -the westward movement of winds and currents in the pacific -heavy mudslides in california and tornadoes in florida -the eastward movement of winds and currents in the

How does Rutherford's model of the atom compare with Thomson's model? A.) They both describe atoms as small, indivisible spheres. B.) They both describe electrons as moving around the nucleus. C.

Find the force needed to lift a 3,000 - N weight using a machine with a mechanical advantage of 15