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A transformer is made by winding a primary coil of 270 turns around an iron core. A secondary winding of 54 turns is made around the same core. If the primary voltage is 120 Volts, what is the output voltage on the secondary?
A solid concrete wall 4.0 m by 2.4 m and 30 cm thick, with a thermal conductivity of 1.3 W/(m?K), How much heat flows through the wall in one hour
The Burj Khalifa in Dubai is the world\'s tallest building. The structure is 828 m (2,716.5 feet) and has more than 160 stories. how high is the hotel room from the ground
A 73kW radio station broadcasts its signal uniformly in all directions. What is the average intensity of its signal at a distance of 300m from the antenna? I_avg=_______mW/m^2
An ac generator has a frequency of 4.80 kHz and produces a current of 0.0400 A in a series circuit that contains only a 231 resistor, Obtain the voltage of the generator
a small freshman is released from rest and falls screaming 30.5 m near the surface of the earth. neglect air
A 275 ball is tied to a string. It is pulled to an angle of 4 and released to swing as a pendulum. A student with a stopwatch finds that 17 oscillations take 20.
Apollo 14 astronaut Alan B. Shepard Jr. used an improvised six-iron to strike two golf balls while on the Fra Mauro region of the moon's surface, What is the numeric value of the ratio
A force of 45 N acts on a ball for 0.2 sec If the ball is initially at rest, What is the final momentum of the ball
an aiplane accelerates from rest down a runway at 3.20 ms2 for 32.8 s until it finally lifts off the ground. determine
A possible spacecraft design uses a solar sail made of aluminized plastic. what is its acceleration at the radius of the Earth's orbit
A worker stands still on a roof sloped at an angle of 23° above the horizontal. He is prevented from slipping by a static frictional force of 540 N. Find out the mass of the worker.
If one shines a laser with wavelength = 650 nm through a single slit of width a = 0.04 mm, How far apart are the minima
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