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(a) How much power is radiated by a tungsten sphere (emissivity e = 0.35) of radius 21 cm at a temperature of 28°C?
______W
(b) If the sphere is enclosed in a room whose walls are kept at -5°C, what is the net flow rate of energy out of the sphere?
a ferry boat transports tourists among three islands. it sails from the first island to the second island 4.76 km away
A "cart" on an air track has a mass of 2 kilogram and a speed of 6 meter per second. Obtain the speed of the carts after the collision
A ball has a diameter of 3.77 cm and average density of 0.0842 g/cm3. What force is required to hold it completely submerged under water
Two heat reservoirs at temperatures 165°C and 60°C, respectively, are brought into thermal contact, find the change in the entropy of the two-reservoir system
Liquid water extinguishes a flame two ways one by absorbing much of the heat that the fire needs to sustain itself and two by wetting, which block oxygen from reaching the burning material.
A positive charge of +2.00 nC exerts an upward 0.200 N force on an unknown charge located 30.0 cm directly below it. Calculate the magnitude of the charge and enter the answer with proper sign for the charge in units C.
A merry-go-round with a moment of inertia equal to 1250 kg•m2 and a radius of 2.5 meter rotates with negligible friction at 1.70 rad/s. Compute what is her mass
a plane is flying in the horizontal plane. at time t1 0 s with the components of its velocity are vx 100 ms and vy
A 0.10-kg object with a velocity of 0.20 m/s in the +x direction makes a head-on elastic collision with a 0.15 kg object initially at rest
A cannonball (20kg) is shot from a cannon(200kg) with a velocity of 20m/s. what is the backwards velocity of the cannon
a worker drags a crate across a factory floor by pulling on a rope tied to the crate. the worker exerts a force of
A ray of red light, for which n=1.54 and a ray of violet light, for which n=1.59, travel during a piece of glass. They meet right at the boundary among the glass and the air, and emerge into the air as one ray with an angle of refraction of 22.5?. Wh..
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