Achampion athlete can produce one horsepower (746 w) for a short period of time. if a 70-kg athlete were to bicycle to the summit of a 500-m high mountain while expending power at this rate, she would have used at least j of energy.

The energy the athlete has the use to ride to the summit of the hill is equal to the increase in gravitational potential energy of the athlete:

where m is the mass of the athlete, g is the gravitational acceleration and is the height of the top of the hill with respect to the ground.

In this problem, , and , therefore the minimum energy the athlete must use is

the answer is neither ball has a charge.

because if they were both positively charged, they will repel each other.

if they were positively and negatively charged, they will seek.

305.7

explanation:

density =m/v

density =917/3.00

density = 305.

approximately = 305.7

in four significant figures