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The Kelvin temperature of an object is T1, and the object radiates a certain amount of energy per second. The Kelvin temperature of the object is then increased to T2, and the object radiates twice the energy per second that it radiated at the lower temperature. What is the ratio T2/T1?
A uniform cylinder whose mass is 50 kg and radius is 0.20 m is mounted so that it turns without friction on its axis, which is fixed. What is the magnitude of the torque acting on the cylinder
Estimate how many molecules of air are in each 1.8 L breath you take that were also in the last breath Einstein took (assumed to be the same volume). (Hint: Assume the atmosphere is about 12 km high and of constant density. Take the temperature of th..
In Lab 2 you pushed a cart up an incline plane with friction. If the acceleration of the cart on the way up after you release it is 5.5 m/s2 and the acceleration of the cart on the way back down is 3.2 m/s2
To lift a wire ring of radius 1.95 cm from the surface of a container of blood plasma, a vertical force of 1.79 10-2 N greater than the weight of the ring is required. Find the gauge pressure at the pipe input
if electrical energy costs 12 cents or 0.12 per kilowatt-hour then what would the following events cost?a burning a 40w
A baggage handler throws a 20kg suitcase along the floor of an airplane luggage compartment with a speed of 1.2 m/s. What is the suitcase's coefficient of kinetic friction on the floor
A 3.25G bullet picks up an electric charge of 1.75uC as it travels down the barrel of a rifle. Calculate the magnitude of the bullet's acceleration due to the magnetic force at the instant it leaves the rifle barrel
a projectile is fired with an initial velocity of 35 m/s at an angle of 30 degrees above horizontal of a 30 feet tall building. find (a) the max height of the projectile
he wavelength of an electromagnetic wave inside water (nwater = 1.33) is ? = 660 nm. find the wavelength of the same electromagnetic wave
Captain Kirk and crew land on a planet that is made ofintergalactic bird feathers. What is the apparent weight of someone at the equator
a pipe of length 0.80m is opened at both ends. if the fundamental frequency of this pipe is 340 hz. what would be its
Photons of wavelength 430 nm are incident on a metal. What is the work function of the metal
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