A skater with moment of inertia 4kgm^2 is spinning with 2rev/sec with her hands and one foot extended when she pulls her hands and foot inwards she can spin with 4rev/sec. what is the moment of inertia of the skater with her hands and foot pulled inwards?

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 long handle on a rake is a(n) a. lever b. screw c. wedge d. inclined plane

Which of the following is the phase that results when the moon is on the opposite side of the earth from the sun? a. quarter moon b. crescent moon c. new moon d. full moon