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To the unaided eye, the planet Jupiter has an angular diameter of 50 arc seconds. What will its angular size be when viewed during a 0.75 m focal length refracting telescope by an eyepiece whose focal length is 30 mm?
the average thermal conductivity of the walls including the windows and roof of the house depicted in the figure below
A glass camera lens, with an index of 1.55 is to be coatedwith a cryolite file (n~1.30) to decrease the reflection ofnormally incident green light (λo=500nm). What thickness should be deposited on the lens
A parachutist of 60 kg descends at a constant speed of 4.4 m/s. What is the rate of increase of entropy of the parachute
Just as the surface area-to-volume ratio depends on size, so can other properties. To see how, suppose that your size suddenly doubled; By what factor has your weight increased
What angular resolution would you need to see the Sun and Jupiter as distinct points of light if you were looking at it from 15 light years away
When two identical ions are separated by a distance of 8.6×10?10 m, How many electrons are missing from each ion
A ship is expecting to travel to its home port 410 km due East. Before the ship starts to travel, a severe storm comes up and blows the ship 290 km due South. How far is the ship from its home port
Two ice skaters are gliding together along the ice, both moving at a constant velocity (sliding without exerting a force). The first skater (the one in the back), with mass M1 = 59 kg, pushes the second skater (the one in front), with mass M2 = 70..
A 20 g bullet moving at 1000 m/s is fired through a one-kg block of wood emerging at a speed of 200 m/s. What is the change in the kinetic energy of the bullet-block system as a result of the collision assuming the block is free to move?
At t = 0 the current to a dc electric motor is reversed, resulting in an angular displacement of the motor shaft given by ?(t) = (240 rad/s)t ? (21.0 rad/s2)t2 ? (1.60 rad/s3)t3. At what time is the angular velocity of the motor shaft zero
A child's toy consists of a piece of plastic attached to a spring in the figure below. The spring is compressed against the floor a distance of 2.00 cm, estimate the force constant of the spring
Some bacteria are propelled by motors that spin hair-like flagella. A typical bacterial motor turning at a constant angular velocityhas a radius of 1.9x10-8m, and a tangential speed at therim of 2.9x10-5 m/s.
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