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The total current delivered to a number of devices connected in parallel is the total of the individual currents in each device. Circuit breakers and resettable automatic switches that protect against a dangerously large total current by "opening" to stop the current at a specified safe value. A 1620-W toaster, a 1140-W iron, and a 1230-W microwave oven are turned on in a kitchen. As the drawing shows, they are all connected during a 20-A circuit breaker to an ac voltage of 120 V. (a) what is the equivalent resistance of the three devices? (b)What is the total current delivered by the source? (Will the breaker "open" in this case?) (c) Will the breaker open? 1 for yes or 2 for no.
q1. a proton travels with the speed of 8.34times105 ms at an angle of 32.3deg with the direction of a magnetic field.
You are designing a delivery ramp for crates containing exercise equipment. Calculate the maximum force constant of the spring that can be used in order to meet the design criteria
There is a uniform electric field for regions near the surface of the earth equal to -150 N/C K. (It is directed toward the center of the earth or simply downward).
A 15 kg child sits on the edge of at 2 m radius, 200 kg merry go round. A father as been getting a little carried away, What is the final angular velocity of the merry go round
question1two dogs pull horizontally on ropes attached to a post angle problem 1 between the ropes is 60.0 degrees. if
the value of w is about 4.24 ev for zinc. what is the maximum wavelength that light falling on the zinc can have if it
What is the power output in horsepower of an electric motor turning at 4550rev/min and developing a torque of 4.75N, Calculate the angular momentum of a solid uniform sphere
A stick is resting on a concrete step with 1/4 of its length hanging over the edge. what is the magnitude of the angular acceleration of the stick at the instant shown
A horizontal force of 2.8 N is applied to a 1.2- kg radio, initially at rest on a table with a level surface. What is the coefficient of friction if it just begins to move
A divers lungs hold 0.0050 m^3 of air at sea level, where the pressure is 101.3 kPa. what is the volume of the air in his lungs at a depth of 3 m
a frictionless pulley which can be modeled as a 0.80 solid cylinder with a 0.30 m radius has a rope going over it. The tension in the rope is 10 N on the right side and 12 N on the left side. What is the angular acceleration of the pulley.
An x-ray photon with wavelength 5.0 pm collides with a free electron initially at rest. find the maximum possible kinetic energy acquired by the electron
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