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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?
Estimate the force P to accelerate the 80 - Ib block at 6ft/sec2 to the right.
A block with mass m = 15kg rests on a frictionless table and is accelerated by a spring with spring constant k = 4234N/m after being compressed the distance x1 = 0.536m from the spring's unstretched length. The floor is frictionless except for a roug..
A penny sits on a rotating disk that rotates once every 0.9 s. The coefficients of static and kinetic friction between the penny and disk are 0.58 and 0.48, respectively. For the penny to not slide, what is its largest distance from the center of the..
Find the value of Q that would make the thickness of the equivalent body 0.1 times its length (i.e the value of y at the dividing streamline at x=0 is 1/10 of the x coordinate at the aft stagnation point.).
A person of mass 89.70 kg escapes from the burning building by jumping from a window situated 27.50 m above a catching net.
Where is center of mass of the system
A jogger runs 100m due east, then changes direction for the second leg of the run. At the end of the run, she is 350m away from the starting point at an angle of 25.0° north of east. What were the direction and length of her second displacement? Util..
A rifle with a barrel length of 56 cm fires a 14 g bullet with a horizontal speed of 350 m/s/s. The bullet strikes a block of wood and penetrates to a depth of 13 cm.
An astronaut on a small planet wishes to measure the local value of g by timing pulses travelling down a wire which has a large object suspended from it. Imagine the wire of mass 3.80 g is 1.60 m long and has a 3.00-kg object suspended from it. A pul..
A baseball is bunted down the third-base line leaving the bat from a height of 0.850m with an initial velocity of 4.00m/s at an angle of 37.87° above horizontal.
What is speed of the wind what is coefficient of static friction
Two lightweight rods 24 {rm cm} in length are mounted perpendicular to an axle and at 180 ^circ to each other. At the end of each rod is a 480 {rm g} mass. The rods are spaced 42 {rm cm} apart along an axle. The axle rotates at 4.90 rad/s.
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