8. What unit of power is equal to 746 watts? The unit power is equal to 764 watts is one horsepower (1, Hp).

9. Using your answer to the previous question and slide 28, identify how many joules of energy can be produced by a horse every second?

Answer questions 10-12 based on the following:
It requires a vertical force of 2450 N to raise a crane 120 m in 3 minutes.
10. How much work is done?

11. How much power is produced?

12. What is the mass of the crane?

Amale bird-of-paradise uses a dance to attract mates in which it flaps its tail feathers on the ground and jumps around a potential female mate. a different male bird-of-paradise does a similar dance but it jumps around the female in the opposite direction. the female bird is only attracted to one style of dance, in one direction. this is an example of speciation.

Recent research by marine biologists suggests that bottlenose dolphins have names for themselves. scientists played sounds they had identified as the names of particular dolphins, putting them through a synthesizer so that they did not sound like the voices of particular dolphins. the researchers found that dolphins would respond to the names of other dolphins that they were related to or associated with, but they ignored the names of strangers. this discovery suggests a much greater degree of self-awareness in aquatic mammals than was previously suspected. if this research holds up, what does it suggest about dolphins?

All but one describes an effect of aging on the digestive system. a) decreased acid secretion b) decreased elasticity of stomach c) capacity to resist damage decreases d) food remains in stomach for less time