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The coefficient of linear expansion of copper is 17 × 10-6 K-1. A sheet of copper has a round hole of radius 1.5 m cut out of it. If the sheet is heated and undergoes a change in temperature of 80 K, what is the change in the area of the hole?
A metal wire 1.3mm in diameter and 1.8m long hangs vertically with a 5.4-kg object suspended from it. what is the value of the Young's modulus for the metal
How thick should the air layer be between two flat glass surfaces if the glass is to appear bright when 530 light is incident normally.
A horizontal magnetic field of 1.0 x 10^-4 T is at an angle of 30 degrees to the direction of the current in a straight wire 75 cm long. what is the magnitude of the force on the wire
A woman is reported to have fallen 139 ft from a building, landing on a metal ventilator box, which she crushed to a depth of 30 in. She suffered only minor injuries.
What is the surface temperature of Betelgeuse, a red giant star in the constellation of Orion, which radiates with a peak wavelength of about 970 nm
A petite young woman distributes her 550{\rm N} weight equally over the heels of her high-heeled shoes. Each heel has an area of 0.650{\rm cm^2}. What pressure is exerted on the floor by each heel
What is the induced current in the loop?
An astronaut at rest on Earth has a heartbeat rate of 73 beats/min. When the astronaut is traveling in a spaceship at 0.87c, what will this rate be as measured by the following: (a) an observer also in the ship beats/min (b) an observer at rest on Ea..
An interferometer is used to measure the length of a bacterium. The wavelength of the light used is 650 nm. How long is the bacterium
What is the magnitude of the apparent weight of a 68kg astronaut 2600km from the center of the Earth's Moon in a space vehicle accelerating toward the Moon at 2.1m/s2
A bullet is shot out of a gun with a 61 cm barrel at a speed of 410 m/s into a block of wood. The bullet enters the wood 13 cm. Illustrate what force does the block exert on the bullet? What is the time it takes?
A worker drags a crate across a factory floor by pulling on a rope tied to the crate. Calculate the magnitude of the acceleration of the crate
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