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Steel rails 25.0m long are laid end to end with gaps between them to account for thermal expansion. Part A If the track is laid when it's 18 degrees C, how large should the gaps be to allow temperatures up to 39 degrees C? Part B If the track is laid using the gaps you found in part (a), how large will the gaps be on a -18 degrees C winter morning? Express your answers to two significant figures and include the appropriate units.
q1. a rocket moves with a velocity of 0.818c to the right with respect to a stationary observer a. an observer b moving
The length of a simple pendulum is 0.77 m and the mass of the particle (the "bob") at the end of the cable is 0.25 kg. What is the angular frequency of the motion
A cylinder is 0.10 m in radius and 0.20 in length. Its rotational inertia, about the cylinder axis on which it is mounted, is 0.020 kg . m2. A string is wound around the cylinder and pulled with a force of 1.0 N. The angular acceleration of the cylin..
An airplane is sent on a rescue mission to help a stranded explorer near the South Pole. The plane cannot land, but instead drops a supply package of mass m = 58 kg while it is flying horizontally with a speed of vp = 116 m/s. What is the mass of ..
Use conservation of energy to calculate the speed of the alpha particle at infinity. m/s (e) If the two protons are released from rest and the alpha particle remains fixed, calculate the speed of the protons at infinity. m/s
If the x position of a particle is measured with an uncertainty of 1.00×10-10 m, then what is the uncertainty of the momentum in this direction
In an EM wave traveling west, the B field oscillates vertically and has a frequency of 80.0 kHz, What are the frequency and rms strength of the electric field
Two identical conducting spherical shells S1 and S2 carry charges Q1 and Q2, respectively, Determine the total charge on S1 and S2 after they are separated
A bar with cross-sectional area A = 0.5cm2 is used to conduct heat between two regions at different temperature. The bar is made of silver, k = 417 W/(m·K). Find the length of the silver bar
Bicyclists in the Tour de France reach speeds of 34.0 miles per hour (mi/h) on flat sections of the road. What is this speed in meters per second
Discuss the possible changes of whales' songs as a result of temperature, wave speeds, and etc. How could you distinguish the whales' songs from other songs
Cosnider Children playing on a merry go around that is 6m in diamter, turning at 10 revelutions per minute. What will the Coriolis Force observed on a 600 gram basketball thrown with a horizontal speed of 5m/s? It is thrown between two children on o..
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