An 85 kg object is moving at a constant speed of 15 m/s in a circular path, which has a radius of 20 meters. what centripetal force is exerted on the body? a. 42.50 n b. 63.75 n c. 956.25 n d. 765.00 n

Centripetal force needed to move mass 'm' in a circle with radius 'r' at speed 'v' is

F = m · v² / r

F = (85 kg) ·(15 m/s)² / (20 m)

F = (85kg · 225m²) / (20 m·s²)

F = (85 · 225 / 20)  (kg·m² / m·s²)

F = 956.25  kg·m/s²

F = 956.25 Newtons

answer: 802.3 kilo joules of energy represents 191.75 kilo calorie of energy.

explanation:

energy released during combustion of one mole methane = 802.3 kilo joules

if 1 kilo joule = 0.239006   kilo calorie

then ,802.3 kilo joule will be = 802.30.239006 kilo calorie

802.3 kilo joule = 191.75 kilo calorie

hence, the energy in kilo calorie is 191.75 kilo calorie.

im srry but ur wrong the answer is d a smooth rock, some red dirt, and an empty bird's nest.