- 8. Two objects were lifted by a machine One object had a mass of 2 kilograms,and was lifted at a speed of 2m/sec The other had a mass of 4 kilograms and was lifted at a rate of 3m/sec a. Which object had more kinetic energy while it was being lifted? b. Which object had more potential energy when it was lifted to a distance of 10 meters?Show your calculation.
- 10. A 150 N boy rides a60 N bicycle a total of 200 m at a constant speed. The frictional force against the forward motion of the bicycle equals 35 N. How much work does the boy do? Explain your answer. (Hint: Remember that work is only done when the motion is in the same direction that the force is applied.)
- The celestial object in the picture orbits the Sun. It is made of ice, dust, and small rocks. The tail glows when it is near the Sun. Which celestial object is in the picture? A. asteroid C. Theteor B. comet D. star
- 3. If you rub cotton on human hair, by pulling on a t-shirt for example, what charge would your hair end up with? 4. If you charged a balloon by touching it with a charged ebonite rod (recall, ebonite gets a
- 18. Quels sont les avantages d'une réduction de la consommation d'électricité à la maison, au travail et pour l'environnement.
