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A helicopter lifts a 72kg astronaut 15m vertically from the ocean (from rest) by means of a cable. The acceleration of the astronaut is g/8.
a) How much work is done on the astronaut by the force from the helicopter. (cable)
b) How much work is done on the astronaut by the gravitational force?
c) What is the kinetic energy and d) speed of the astronaut just before he reaches the helicopter?
You are to design a tungsten filament light bulb that has a power of 60W when it is connected to 120V at which condition its temperature is expected to be 1020C. Calculate the length of filament that you need
To determine the specific heat capacity of lead, you get 500g of lead shot to 100 degrees C and place it in an aluminum calorimeter of mass 250g, what is the specific heat of lead
A spherical capacitor contains a solid spherical conductor of radius 0.5mm with a charge of 7.4 micro coulombs, surrounded by a dielectric material with er = 1.8 out to a radius of 1.2mm, then an outer spherical non-conducting shell, with variable ch..
a wedge-shaped sliver of glass viewed from above is illuminated with 436-nm light. the sharp edge is dark. what is the
A solid spherical conductor of radius 15 cm has a charge Q = 6.5 nC on it. How much charge is there on the second sphere after the two spheres have been separated
a 325kg object, initially moving at 7.50 m/s, to a final velocity of 28.5 m/s in 16.5 seconds. What was the change in kinetic energy of the object
Light of 550nm is incident on two slits. A maximum is seen at an angle of 4.10 degrees and a minimum at 4.78 degrees. What is the distance between the slits
a 7.0-m-diameter garden pond holds 6.4 times 103 kg of water. solar energy is incident on the pond at an average rate
suppose a star the size of our sun but of mass 8.0 times as great were rotating at a speed of 1.0 revolution every 11
An 39-turn circular coil of radius 22.1 cm carries a current of 3.37 A. What is the strength of the magnetic field
A home (volume = 1000 m3) built in 1946 has urea formaldehyde insulation, which outgases into the home at a rate of 5 ng/hr, What is the steady state concentration (C) of formaldehyde in the home
In a typical game of squash, two people hit a soft rubber ball at a wall until they are about to drop due to dehydration and exhaustion.
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