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A simple magnifying glass can focus sunlight enough to heat up paper or dry grass and start a fire. A magnifying glass with a diameter of 4.2 cm has a focal length of 5.9 cm. The mean distance of the Sun from the Earth is 1.50 1011 m. The mean radius of the Sun is 6.96 108 m.
If the intensity of the Sun falling on the magnifying glass is 0.85 kW/m2, what is the intensity of the image of the Sun?
The wheel of the car has a radius of 0.340 m. The engine of the car applies a torque of 282 N•m to this wheel, that does not slip against the road surface. Since the wheel does not slip, the road must be applying the force of static friction to the w..
One side of the roof of a building slopes up at 37.0°. A roofer kicks a round, flat rock that has been thrown onto the roof by a neighborhood child.
questionin everyday life we know that something described as white hot is hotter than something described as red hot.
After a tornado, a 0.55-g straw was found embedded 2.8 cm into the trunk of a tree. If the average force exerted on the straw by the tree was 70 N, what was speed of the straw when it hit the tree .
Dr Jeeves has invented a new kind of heat engine that operates using a pool of molten copper at 1083 degrees celcius and a block of solid lead at 327 degrees celcius. How much power is produced by the engine
q1. a small metal bead labelled a has a charge of 29 nc. it is touched to metal bead b initially neutral so that the
In this problem you will consider the balance of thermal energy radiated and absorbed by a person. Find the net power radiated by the person when in a room with temperature . Express the net radiated power numerically, to the nearest 10 W
In the Millikan oil-drop experiment, an atomizer (a sprayer with a fine nozzle) is used to introduce many tiny droplets of oil between two oppositely charged parallel metal plates.
Two asteroids of equal mass collide with a glancing blow. Asteroid A, which was originally traveling at 40.0 m/s, is deflected 30.0? from its original direction, Find the speed of each asteroid after the collision
the speed of hockey pick decreases from 45.00 to 44.67 m/s in coasting 16 m across the ice. find the coefficient of kinetic friction between the puck and the ice
A certain part of an aircraft engine has a volume of 2.6 ft3. Determine how much weight is saved by using aluminum instead of nickel
If you needed to eliminate some noise from some seismic data and you want to use a bandpass filter to do so, how would you go about designing and applying the filter
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