As shown in the figure below, a skateboarder starts at point A on the ramp and r

Question

As shown in the figure below, a skateboarder starts at point A on the ramp and rises to point B, a maximum height of h = 2.91 m above the top of the ramp. If the amount of work done against friction is insignificant, determine his initial speed at point A. m/s Samantha wishes to maintain her weight and goes to the gym to work off the calories she consumed at breakfast that morning. She lifts a 30.0-kg barbell from shoulder level to above her head, through a vertical height of 0.550 m. How many times must she lift the barbell to make up for the 3.05 times 10^2 Calories of energy she consumed at breakfast? Note that Calories refers to food calories. reps Sara, who weighs 71 kg, is on a guilt trip after eating a 763-Calorie (763 kcal) breakfast of pancakes loaded with fruits, cream, and syrup. She decides to work out before going to her weekly weight-watchers' meeting. If the height of a single stair is 12 cm, and her body is only 33% efficient in converting chemical energy to mechanical energy, determine the number of stairs Sara must climb to cancel out the Calories consumed. stairs

Explanation / Answer

2)Calculate work done
W=F x d

W= 30 * 9.8 *. 55

W= 161.7 joule or 38.6 calorie

Therefore, no of rounds = 305 / 38.6

N = ~8 cycle.

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