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A helicopter lifts a stretcher with a 74 kg accident victim in it out of a canyon by applying a vertical force on the stretcher. The stretcher is attached to a guide rope which is 50m in long and makes an angle of 37 degrees with respect to the horizontal.
A. what is the minimum amount of work that the helicopter needs to do to lift the injured person and stretcher to its cockpit.
B. If the operation takes 10 seconds, what power is deliever by the helicopter in J/sec? In horsepower?
A potter's wheel having a radius 0.49 m and a moment of inertia 10.9 kg·m2 is rotating freely at 52 rev/min. Find the effective coefficient of kinetic friction between the wheel and the wet rag
A 20.0kg rock slides on a rough horizontal surface at 5.50 m/s and eventually stops due to friction. What average thermal power (Watts) is produced as the rock stops
q1.an automobile driver puts on brakes and decelerates from 68 mph to zero in 16 s. what distance does the car travel?a
A second baseman tosses the ball to the first baseman, who catches it at the same level from which it was thrown. How long is the ball in the air
An L-R-C series circuit, R=150 ohms, L= 0.750H, and C= 1.70x10^-2uF. The source has a voltage amplitude of 140V, What is the average power delivered by the source
A 690-kg elevator starts from rest and moves upward for 3.50 s with constant acceleration until it reaches its cruising speed, 1.85 m/s. What is the average power of the elevator motor during this period
A stationary spherical conductor with a radius of 2.00 cm has a potential of -257 V on the surface. What is the impact speed of the proton
What is the acceleration of a 747 jumbo jet, mass 31,000 kg, in takeoff when the thrust for each of its four engines is 28,000 N?
A patient is having a magnetic resonance imaging scan (an MRI) and has neglected to remove a 5.7 cm diameter metallic bracelet. find the magnitude of the average induced current in the bracelet
Components dropping 10, 20, 30, and 50 volts what is the V applied. What is the algebraic sum of the voltages around a closed loop
Two bumper cars moving on a frictionless surface collide elastically. What is the speed of the first bumper car after the collision
A monochromatic point source of light emits 5.5 W of electromagnetic power uniformly in all directions. Find the (magnitude of the) Poynting vector at a point situated at each of the following locations:
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