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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 rectangular loop of wire with sides 0.23 and 0.39 m lies in a plane perpendicular to a constant magnetic field, compute magnitude of the average emf induced in the loop.
A grasshopper jumps a horizontal distance of 1.50 m from rest, with an initial velocity at a 41.0° angle with respect to the horizontal. Find the initial speed of the grasshopper
What is the magnitude of the current in the wire as a function of time?
Sodium light of wavelength 589nm falls on a diffraction grating and its first-order peak on a screen 60.0cm away falls 3.32cm from the central peak. How many lines per cm does the grating have
a recipe for bread states that the dough must bake for 40 minutes at a temperature of 190degc. the oven you are using
a mass of 200 g vibrates horizontally in Simple Harmonic Motion with a frequency of 30 Hz and amplitude 20 cm. calculate the total energy of the motion
A series ac circuit contains a 330ohm resistor, a 13.0mH inductor, a 2.50microF capacitor, Find the average power delivered to the entire circuit
A cardinal (Richmondena cardinalis) of mass 3.60×10-2 kg and a baseball of mass 0.140 kg have the same kinetic energy. What is the ratio of cardinal's magnitude p_c of momentum to the magnitude p_b of the baseball's momentum.
a farsighted person has a near pont that is 67cm from her eyes. she wears eyeglasses that are designed to enable her to read a newspaper held at a distance of 25cm from her eyes. find the focal length of the eyeglasses
The earth's atmosphere pushes down on the surface of the earth with a force of 14.7 lb for each square inch of the earth's surface. What is the total weight of the earth's atmosphere
A roller coaster car of mass 250 kg has a speed of vo = 12 m/s at point A, located at a height of h = 15 m. find the speed of the car when it reaches point B. use energy ideas
question1assume two boxes on a frictionless table are linked by a heavy cord of mass 1.0 kg. compute acceleration
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