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Q1. Microwave signals are beamed between two mountaintops 51 apart. How long does it take a signal to travel from one mountaintop to other?
Q2. Solar cells convert the energy of incoming light to electric energy; a good quality cell operates at an efficiency of 15 percent. Each person in the United States uses energy (for lighting, heating, transportation, etc.) at an average rate of 11. Though sunlight varies with season and time of day, solar energy falls on United States at an average intensity of 200. Assuming you live in an average location, what total solar-cell area would you need to provide all of your energy needs with energy from the sun?
The distance to the Andromeda Galaxy is estimated at about 2 ´ 106 light years. A light year is distance travelled by light in one year; if the speed of light is 3 ´ 108 m/s, about how far is it from our galaxy to Andromeda? (1 year = 3.15 ´ 107 s..
A 106 m long train begins uniform acceleration from rest. The front of the train has a speed of 23 m/s when it passes a railway worker who is standing 230 m from where the front of train started. What will be the speed of last car as it passes the..
Find out vertical and horizontal components of the pendulum
A 1.86- sound wave travels through the pregnant woman's abdomen and is reflected from the fetal heart wall of her unborn baby. The heart wall is moving toward the sound receiver as heart beats. The reflected sound is after that mixed with the transmi..
How much heat does it take to enhance the temperature of 8.00 of an ideal monatomic gas from 22.0 to 61.0 if the gas is held at constant volume.
What is the maximum height, y2, if the object is thrown with a speed of v2 = 1.99v1 from the surface of Jupiter's moon Io? The acceleration due to gravity on Io is g2 = 1.79 m/s2. Give the reply as a multiple of y1.
A generator uses a coil that has 210 turns and a 0.20-T magnetic field. The frequency of this generator is 60.0 Hz, and its emf has an rms value of 120 V. assume that each turn of the coil is a square (an approximation), conclude the length of wire f..
The speedometer of a truck shows the linear velocity of the truck but actually measures the angular velocity of the wheels and converts that to the linear velocity. If the tires are changed out and larger diameter tires replace the stock tires, does ..
A 65kg trampoline artist jumps vertically upward from the top of a platform that is 2 m above the trampoline with a speed of 4.80m/s.
A 18.0 kg block is dragged over a rough, horizontal surface by a constant force of 77.6 N acting at an angle of 35? above the horizontal. The block is displaced 10.8 m, and the coefficient of kinetic friction is 0.149.
Create a formula to get the time constant of the liquid level system shown in the below figure. When the avg. operating level is h0. The resistance R is linear.
What is the acceleration of two falling sky divers (mass 112.0 kg including parachute) while the upward force of air resistance is equal to one-fourth of their weight.
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