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In a television set the power needed to operate the picture tube comes from the secondary of a transformer. The primary of the transformer is connected to a 120-V receptacle on a wall. The picture tube of the television set uses 105 W, and there is 5.5 mA of current in the secondary coil of the transformer to which the tube is connected. Find the turns ratio Ns/Np of the transformer.
Two conductors are made of the same material and have the same length. Conductor A is a solid wire of diameter 1.2 mm, What is the resistance ratio RA/RB , measured between their ends
a swimming pool measures 10 meters wide by 50 meters long by 4 meters deep. what is the water pressure at this point
A 70.0 kg football player leaps straight up into the air (with no horizontal velocity) to catch a pass. If the ball was moving horizontally when it was caught, how fast was the ball travelling
A uniform electric field of magnitude 4.10 × 105 N/C points in the positive x direction, Find the change in electric potential energy
A spacecraft is traveling with a velocity of v0x = 4330 m/s along the +x direction. Two engines are turned on for a time of 728 s. One engine gives the spacecraft an acceleration in the +x direction of ax = 1.74 m/s2.
Two polarizers are oriented at 48° to each other and polarized light incident on them. what was the initial polarization direction of the incident light
What are changes in the object's momentum and velocity. How much work is done if the similar tension is directed parallel to the snow.
Light has a wavelength of 600nm in a vacuum. It passes into glass, which has an index of refraction of 1.50. What is the WAVELENGTH of the light in the glass
A 700 N window washer is standing on a uniform scaffold supported by a vertical rope at each end. The scaffold weighs 200 N and is 3 m long. what is the force in each rope when washer stands 1 m from one end.
A hoop and a disk, both of 0.72- m radius and 4.0- kg mass, are released from the top of an inclined plane 2.5 m high and 8.9 m long. What is the speed of the hoop
plan a picutre showing Mary's displacment due to rowing, her displacemnet due to the river's motion, and her net displacement.
A bird, starting from its nest (we'll call that the origin), flies 24.0 km due southeast. It then changes directions and flies 26.0 km in a direction 60° north of east. Find the magnitude and direction of its resultant displacement.
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