If 10% of a 85-kg rock climber's total energy expenditure goes into the gravitational energy change when climbing a 120-m vertical slope, what is the climber's average metabolic rate (in watts) during the climb if it takes her 10 min to complete the climb?

Metabolic rate is 1600 W.

Explanation:

Gravitational energy = mgh

= 80 × 10 × 120

=96000

This gravitational energy accounts for 10% of her total energy.

× E(total energy) = 96000

E = 96000 × 10

= 960000 N

Time required = 10 minutes = 10× 60 seconds

=600 seconds

Metabolic rate =

=  

= 1600 W

the total distance traveled by the car is

30km + 49km = 79 km .

find the surface area of the sphere to the nearest square unit. use a calculator.

a. 254 in.2

b. 64 in.2

c. 127 in.2

d. 1,018 in.2