A 65 kg shopper in riding an up-going escalator, which has an incline of 31 degrees with respect to the horizontal. It is moving at 6 m/s. The top of the escalator is 24 m above the ground. Required:
a. Calculate how much work is done by the friction force between the shoes of the shopper and the step of the escalator as the shopper moves from the bottom to the top of the escalator.
b. Calculate how much work is done by gravity for the ride from the bottom to the top of the escalator.
c. Calculate the potential Energy the woman has at the top of the escalator.

Solar cell a produces 100 joules of energy, when a light source is shown on it for 3 minutes. solar cell b produces 200 joules of energy when the same light source is shown on it for 5 minutes. which solar cell works better? a) solar cell b, because it produces more energy. b) solar cell b, because it generates more power. c) solar cell a, because it produces energy quicker. d) solar cell a, because it generates a greater wattage. eliminate

Researchers determine that the biodiversity in a woodland region is declining. they identify two major threats to the region's biodiversity, a method to address each threat, and the expected outcome of each method. this information is shown in the table. a) reforestation would not benefit many species because most forest species live on the ground. b) reforestation would take the longest time to be effective because trees take several years to grow. c) biological augmentation would benefit only a few species because is is typically not very effective. d) biological augmentation would take less time to ve effective because it targets the majority of prey species.

How are the crust and the inner core alike? a) they are both solid. b) they both have the same temperature. c) they are both under the same pressure. d) they are both very close to the center of the earth.