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A transformer on a pole near a factory steps the voltage down from 3600 V (rms) to 120 V (rms). The transformer is to deliver 2000 kW to the factory at 95% efficiency. Find values for the following.
(a) the power delivered to the primary
kW
(b) the current in the primary
A
(c) the current in the secondary
At t=0 a grinding wheel has an angular velocity of 30.0 rad/s. It has a constant angular acceleration of 31.0 rad/s^2 until a circuit breaker trips at time t = 2.00 s. From then on, it turns through an angle 428 rad as it coasts to a stop at constant..
Each surface exerts a force on the bottle that is perpendicular to the surface. What is the magnitude of each of these forces.
In one dimension, it is obvious that the force obeying Hook's law is conservative. Consider instead a spring that obeys Hook's law and has one end fixed at origin.
An elevator is able to raise 9,800 N to a height of 37 m in 12 s, What is the elevator's power output and How much work does the elevator do
How fast should a car move toward. A cardinal (Richmondena cardinalis) of mass 3.90×10-2 and a baseball of mass 0.144 have the same kinetic energy. What is the ratio of the cardinal's magnitude of momentum to the magnitude of the baseball's moment..
When a potential difference of 166 V is applied to the plates of a parallel-plate capacitor, the plates carry a surface charge density of 32.0 nC/cm2. What is the spacing between plates.
Assume that the net horizontal force is due to rolling friction only and take free-fall acceleration to be = 9.80 .What is the coefficient of rolling friction for the tire under low pressure.
You are driving 110 miles to Columbus from Cincinnati. The first 100 miles you drive a good speed of 75mi/h . Unfortunately, you hit a traffic jam the last 10 miles where at least you move a constant 8.00mi/h .
Suppose the mica is 1.5 thick (and therefore fills the space between the plates).The charges on the plates are equal and opposite and of magnitude 380.
The temperature inside the refrigerator is 2.0 °C. It stands in a kitchen whose temperature is 22 °C, what is the entropy change of the kitchen
The nonconservative wind and lift forces take the balloon up, doing +9.70 104 J of work on the balloon in the process. Illustrate at what height above the surface of the earth does the balloon have a speed of 8.90 m/s?
Direction of the surface winds What is the expected composition
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