If the human body could convert a candy bar directly into work, how high could a 76 kg man climb a ladder if he were fueled by one bar (=1100 kJ)?
If the man then jumped off the ladder, what will be his speed when he reaches the bottom?
A 63 kg skier starts from rest at the top of a ski jump, point A in the figure, and travels down the ramp. If friction and air resistance can be neglected, determine
(a) her speed vB when she reaches the horizontal end of the ramp at B
(b) the distance s to where she strikes the ground at C
A projectile is fired at an upward angle of 48.0° from the top of a 130-m-high cliff with a speed of 180 m/s. What will be its speed when it strikes the ground below? (Use conservation of energy. Neglect air resistance.)
A bicyclist coasts down a 6.5 degree hill at a steady speed of 4.5 m/s. Assuming a total mass of 75 kg (bicycle plus rider), what must be the cyclists power output to climb the same hill at the same speed?
The position of a 260 g object is given (in meters) by x = 5.0t3 - 8.0t2 - 45t, where t is in seconds.
(a) Determine the net rate of work done on this object at t =2.1 s.
(b) Determine the net rate of work done on this object at t = 4.1 s.
(c) What is the average net power input during the interval from t = 0 to t = 2.1 s?
(d) What is the average net power input during the interval from t =2.1 s to t=4.1 s?