A woman swimming upstream is not moving with respect to the shore. Is she doing any UT work? If she stops swimming and merely floats, is work done on her? A TM
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- Ts Fl F FN Ft FN FN 2) If Mr. Miranda releases the ladders, he will fall a few meters before the cables attached to him stop his motion before he reaches the floor (which is zero height). With gravity being in your system and the cables representing an outside force, draw an energy bar chart with the picture above as the initial state, and him dangling from the cables as the final state. Assume air drag is small enough to ignore.An airplane pilot fell to the ground after jumping from an aircraft without his parachute opening. He lands in a snowbank, creating a crater 2.1 m deep, but survived with only minor injuries. Assuming the pilot’s mass was 68 kg and his terminal velocity was 35 m/s (the velocity at the point he stopped accelerating on his way down), what is: a) the average force exerted on him by the snow in bringing him to rest? b) the work done by the snow?A kayaker paddles with a power output of35.0 W to maintain a steady speed of 2.24 m>s. (a) Calculate theresistive force exerted by the water on the kayak. (b) If the kayaker doubles her power output, and the resistive force due to thewater remains the same, by what factor does the kayaker’s speedchange?
- If you have an object moving along a rough surface (one in which kinetic friction is a significant contributor) then kinetic energy will be conserved. True O False• In order to keep a leaking ship from sinking, it is necessary topump 12.0 lb of water each second from below deck up a heightof 2.00 m and over the side. What is the minimum horsepowermotor that can be used to save the ship?Air bags are used in cars to decelerate the occupants slowly when a car is suddenly decelerated in a crash. (a) Compute the work done by the decelerating force acting on a 55.0 kg driver if the car is brought to rest from an initial speed of 20.0 m/s. (b) Find the minimum thickness of the air bag if the average decelerating force is not to exceed 8900 N (2000 lb), and the center of the car moves forward 0.800 m during impact
- Water is lifted out of a well 20.0 mm deep by a motor rated at 1.10 hp. Assuming efficiency 85 % , how many kilograms of water can be lifted in 1 min?(a) How many seconds will it take a 10.0 hp motor to lift a 2,000 lb elevator a distance of 16.7 feet? (b) What was the average velocity of the elevator? (a)r = (b) v %3D ft/s(a) Calculate the force needed to bring a 850 kg car to rest from a speed of 90.0 km/h in a distance of 105 m (a fairly typical distance for a nonpanic stop).N(b) Suppose instead the car hits a concrete abutment at full speed and is brought to a stop in 2.00 m. Calculate the force exerted on the car and compare it with the force found in part (a), i.e. find the ratio of the force in part(b) to the force in part(a).(force in part (b) / force in part (a))