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A rod of constant cross-sectional area has conductivity k1 and conducts heat at a constant rate between two reservoirs held at T1 and T2 respectively. It takes t1= 11.0-s to conduct Q= 32.5-J of heat across the rod. How much time would it take to conduct the same amount of heat if half the length of the rod were replaced with a material with conductivity k2=n·k1, where n= 3.7?
An outside loudspeaker (considered a small source) emits sound waves with a power output of 90 W. Find the intensity level in decibels at that distance
A space station shaped like a giant wheel has a radius of 114m and, when empty, a moment of inertia of 5.84E+8kgm^2. A crew of 163 are living on the rim, and the station's rotation causes the crew to experience an acceleration of 1.00g. 0 When 134..
A two-slit pattern is viewed on a screen 1.04 m from the slits. what is the total width of the central bright fringe?
A 90 kg (900 N) mountaineer uses a nylon rope that is 55 m long and 1.0 cm in diameter. 1. If the full weight of the mountaineer is held by the rope, what is the stress of the rope? 2. Is nylon strong enough to not rupture under that stress? 3. If th..
The tungsten filament in the 36 ohm bulb is 8 mm long and has a cross-sectional area of 2e-10 m^2. What is the magnitude of the electric field inside this metal filament?
A car travelling at an average speed of 55ph takes 5 h to reach B town from town A.What is the distance between A and B.
An astronomical telescope is designed with an overall magnification of 80x. The objective has a focal length of 98.0 cm. How far should the eyepiece be from the objective
A foam ball of mass 0.150 g carries a charge of -2.00 nC. The ball is placed inside a uniform electric field, What are the magnitude and direction of the electric field
The gondola ski lift at a Colorado ski resort is 2676 m long. On average, the ski lift rises 12.7° above the horizontal. How high is the top of the ski lift relative to the base
A steel cylinder with a radius of 5cm and a length of 4cm is placed in end to end thermal contact with a copper cylinder of the same dimensions. If the free ends of the two cylinders are maintained at constant temperatures of 95C(steel) and 15C (cop..
A child goes down a playground slide with an acceleration of 1.30. Find out the coefficient of kinetic friction between the child and the slide if the slide is inclined at an angle of 34.0 below the horizontal.
A 10 kg block of ice has a temperature of -8°C. The pressure is one atmosphere. The block absorbs 4.20 106 J of heat. What is the final temperature of the liquid water?
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