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A 9 kg rock is suspended by a massless string from one end of a 3 m measuring stick. What is the weight of the measuring stick if it is balanced by a support force at the 1 m mark? The acceleration of gravity is 9.81 m/s^2. Answer in units of N
A nichrome toaster wire, initially at room temperature, carries 2.72A immediately after it's turned on. After the wire heats, the current drops to 2.44A
Find the first and second derivative with respect to x of f(x) = (exp(x/a)-exp(-x/a))/2, where exp(x)=e^x is the exponential function.
Two wheels have the same mass and radius of 4.8 kg and 0.54 m, respectively. One has (a) the shape of a hoop and the other (b) the shape of a solid disk. The wheels start from rest and have a constant angular acceleration with respect to a rotational..
An iron wire with a diameter of 1.2 mm has a uniform electric field of 0.35 V/m imposed along its entire length. What is the current density in the wire
A tungsten wire has a radius of 0.070 mm and is heated from 20.0 to 1416 oC. The temperature coefficient of resistivity is ? = 4.5 x 10-3 (Co)-1, How long is the wire
The displacement of a wave traveling in the positive x-direction is D(x,t)=(3.5cm)sin(2.7x?122t), where xis in m and t is in s. What is the frequency of this wave
An archer wishes to shoot an arrow at a target at eye level a distance of 49.0 m away. what angle should the arrow make with the horizontal as it is being shot
The acceleration of a system of two masses of 15kg and 20kg, both connected by a rope and moving on a horizontal plane, is 5m/s^2.Determine the force that acts on the system.
Old naval ships fired 10kg cannon balls from a 250 kg cannon. It was very important to stop the recoil of the cannon, as otherwise the heavy cannon would go careening across the deck of the ship.
Calculate the thermal de Broglie wavelengths for helium-4 (boson) and helium-3 (fermion) gases at T = 5K
A dissecting microscope is designed to have a large distance between the object and the objective lens. What is the angular magnification
You place one end of the pole on a fence post and hold the other end of the pole 35 from its tip. Explain how much force must you exert to keep the pole motionless in a horizontal position?
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