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A helicopter lifts a 61 kg astronaut 13 m vertically from the ocean by means of a cable. The acceleration of the astronaut is g/13. How much work is done on the astronaut by (a) the force from the helicopter and (b) the gravitational force on her? Just before she reaches the helicopter, what are her (c) kinetic energy and (d) speed?
question a 3.4 kg object moving at 5.4 ms in the positive direction of an x axis has a one-dimensional elastic
a building is being knocked down with a wrecking ball which is a big metal sphere that swings on a 13-m-long cable. you
An ultrasound unit sends a 2.4 MHz sound wave into a 35cm long tube filled with an unkown liquid. What is the speed of the sound in the liquid
A tungsten filament incandescent light bulb emits spherical electromagnetic waves of 50 Watts isotropically. What is the radiation pressure
If a four engine jet accelerates down the runway at 2m/s2 & one of the jet engines fails, how much acceleration will the other three produce?
A 42 kg child is riding on a carousel (merry-go-round) at a constant speed of 6 m/s. What is the magnitude of the change in the child's momentum |Δp with arrow| in going all the way around (360°)?
A car of mass 1430 kg drives in a direction 80o north of east at a latitude 73o in the northern hemisphere with a speed 85.0 km/hr
The vertical displacement due to a travelling wave moving horizontally is given by y(x,t) = 5.4cos(.4(rad/s) t (sec)) where x and y are in centimeters. The horizontal distance between the points whose phase differs by pi/3 is A. 1.05 cm B. 2.62 cm C...
A lens produces a magnification of -1.8 when an object is placed 2.5 cm from the lens. compute the focal length of the lens?
A 190 rad dose of radiation is administered to a patient in an effort to combat a cancerous growth. Calculate the amount of energy delivered per unit mass
a shopper pushes a grocery cart by exerting a force on the handle. if the force equal 76 N at an angle of 40.0 degrees below the horizontal, how much force is pushing the cart in the forward direction
A light beam of wavelength 500 nm in air hits transparent material. When the angle of refraction is 40.0 degrees, Find the polarizing angle
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