The rope and pulley have negligible mass, and the pulley is frictionless. The coefficient of kinetic friction between the 8.00kg block and the table is lk = 0.250. The blocks are released from rest. Use the energy methods to calculate the speed of the 6.00- kg block after it has descended 1.50m. 8.00 kg 6.00 kg

3. A 26.00-kg child initially at rest slides down a playground slide from a height of 3.20 m above the bottom of the slide. If her speed at the bottom is 2.80 m/s, how much energy is lost due to friction? J cci16 f16 cci16 ceil6 cci

speed will be v=3.76ms A water skier is being pulled by a tow rope attached to a boat. As the driver pushes the throttle forward, the skier accelerates. A 72kg water skier has an initial speed of 6.0m/s. 5.0 seconds later, the speed increases to 11.2m/s. What is the net work done on the water skier? If we assume the efficiency in converting kinetic energy from the boat to the water skier is only 20%, what is the power of the boat? What is the amount of work done by the resistive force during the 5-second period? Answer: W =m(v -v)- 3219.84J × 3.2×10°J net 3219.84J The power of the boat will be P=- = 3.2x10 W 0.2x5s =-3.2×10'W×0.8×5s =-1.3×10ʻJ resistive W. 3

A daredevil on a motorcycle leaves the end of a ramp with a speed of 32.4 m/s as in the figure below. If his speed is 30.5 m/s when he reaches the peak of the path, what is the maximum height that he reaches? Ignore friction and air resistance.m