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The turns ratio of a transformer used in half wave rectifier is 20:1. The primary is connected to the power mains: 220 V, 50 Hz. If the diode resistance in forward bias is 20 and the load resistance, RL is 500 , determine i) the peak value, the dc value and the rms value of current; ii) the ripple factor; and iii) the rectification efficiency.
Directions: Compute the charge of the following ions. Show your solutions.
a. Anion with a charge of -3
b. Cation with a charge of +2
c. Anion with a charge of +5
In the middle of the night, you are standing a horizontal distance of 14.0 m from the high fence that surrounds the estate of your rich uncle. The top of the fence is 5.00 m above the ground. You have taped an important message to a rock that you want to throw over the fence. The ground is level, and the width of the fence is small enough to be ignored. You throw the rock from a height of 1.60 m above the ground and at an angle of 56.0o above the horizontal. (a) What minimum initial speed must the rock have as it leaves your hand to clear the top of the fence? (b) For the initial velocity calculated in part (a), what horizontal distance beyond the fence will the rock land on the ground?
If a car drives for 60 km in a Westerly direction, then turns around and drives for 128 km to the East. What is the resultant displacement of the car?
A man pushed a 1,000 kg car to the +x direction. If the applied force is 5000N, what is the acceleration of the the coefficient of the friction force is 0.57
consider a copper of mass 50kg at a temp 10 degree celcius and a copper calorimeter of mass 15kg with water to weigh 4okg. when heat energy is supplied to the calorimeter until the temp reaches 50 degree celcius. find the specific heat capacity of the copper.(given that the s.h.c of water = 4200 and copper = 400) initial temp of calorimeter is 54 degree celcius
1. Several environmental scientists are monitoring the movement of a cheetah on an Ethiopian plain. They find that at t = 5 min, the cheetah is traveling at 5 m/s due west. At t = 15 min, it is moving at 12 m/s toward the west, while at t = 30 min it is moving at 2 m/s toward the east. If we call western movement positive, when is the cheetah’s speed negative? A) During the entire interval from t = 15 to t = 30 min B) Only during part of the interval from t = 15 to t = 30 min C) During at least part of the interval from t = 15 to t = 30 min, and possibly at other times D) Never, since speed is not a vector quantity
A man rides up in an elevator 12 m.He gains 6500 J of potential energy.What is the man's mass?
The principle violated by the following electronic configuration.
1s(2)2s(6)3s(2)
(10%) Problem 10: A jet dives vertically at a speed v = 170 m/s, before pulling out of the dive along a circular arc. The pilot can survive an acceleration of a = 8.9 g. His mass is m = 81 kg.
What would be the magnitude of the normal force, in newtons, be at the top of an arc of this radius going the same velocity?
