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A transformer with 410 turns in its primary coil and 34 turns in its secondary coil is designed to deliver an average power of 1300 W with a maximum voltage of 60 V. What is the maximum current in the primary coil?
The overhead projector used in our lectures form (approximately) 2m-tall images of transparencies that are 30 cm tall. The screen is approximately 3m from the projector.Using these numbers, what must the focal length of the projector lens , in cm?
An electron traveling horizontally with velocity 1.55 x10^{5} m/s enters a region where a uniform magnetic field is directed into the plane of the paper, find the magnitude of the magnetic force exerted on the particle
In a 1.31 T magnetic field directed vertically upward, a particle having a charge of magnitude 8.60 uC and initially moving northward at 4.72 km/s is deflected toward the east. Find the magnetic force on the particle
It was once recorded that a Jaguar left skid marks that were 290 m in length. determine the speed of the Jaguar before it began to skid
A Carnot engine whose high-temperature reservoir is at 680{\rm K} takes in 530{\rm J} of heat at this temperature in each cycle, What is the temperature of the low-temperature reservoir
How many 95W light bulbs can you use in a 120V circuit without tripping a 17A circuit breaker? (The bulbs are connected in parallel, which means that the potential difference across each light bulb is V.)
A microphone is moving in air towards a stationary source of sound. The detected frequency is 106 Hz greater than the emitted frequency. What is the speed of sound in the unkown liquid
A 5 kg ball is thrown upward with an initial speed of 30 meters per second. Suppose there is a constant air resistance of 25N opposing the motion during its entire up and down path Draw a picture showing all the forces on the ball while it is on t..
Double slits of 0.115 mm separation are placed at the front of a lecture room that is 17.1 m long. what is the separation between the first two bright fringes
An ice skater is traveling in a straight, horizontal line on the ice with a velocity of v=5.5m/s in the positive x direction. Write an expression for the normal force, F_n, that the ice pushes against both skates together
A puck on a frictionless air hockey table has a mass of 0.500 kg and is attached to a cord passing through a hole in the surface, What is the new angular velocity of the puck
q1. a 77 person stands on the uniform ladder 4.0 long that weighs 100. the floor is rough hence it exerts both a normal
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