As you throw a 2.00 x 10 g baseball, your hand moves a distance of 90.0 cm before you release the ball. If you exert an average force of 50.0 N on the ball while it is in your hand, determine: (a) the kinetic energy of the ball as it leaves your hand. (b) the speed with which the ball leaves your hand.

What is the frequency of a light wave with a wavelength of 620nm

Consider an ordinary, helium-filled party balloon with a volume of 2.2 ft3. the lifting force on the balloon due to the outside air is the net resultant of the pressure distribution exerted on the exterior surface of the balloon. using this fact, we can derive archimedes’ principle, namely that the upward force on the balloon is equal to the weight of the air displaced by the balloon. assuming that the balloon is at sea level, where the air density is 0.002377 slug/ft3, calculate the maximum weight that can be lifted by the balloon. note: the molecular weight of air is 28.8 and that of helium is 4.

The two required components for a generator