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A 1.70mcylindrical rod of diameter 0.550cmis connected to a power supply that maintains a constant potential difference of 13.0Vacross its ends, while an ammeter measures the current through it. You observe that at room temperature (20.0C) the ammeter reads 18.8A, while at 92.0Cit reads 17.3A. You can ignore any thermal expansion of the rod.A) Find the resistivity and for the material of the rod at 20 C. (Answer in Omega*m)B) Find the temperature coefficient of resistivity at 20 Cfor the material of the rod. (Answer in Degrees Celcius^-1)
A sample containing beryllium (atomic mass 9 u), aluminum (27 u), and an unknown element is placed in a mass spectrometer. What is the mass of the unknown element
A 5.0 kg object is moving to the right at 4 m/s and collides with another object of mass 10 kg moving to the left at 5 m/s. Find the momentum of the combined object
Assuming that a light bulb acts as a point source emitting the light isotropically at 100W. What is the root-mean-square value of the electric field at distance d=20m from the bulb
A communications satellite with a mass of 400kg is in a circular orbit about the Earth. Calculate the wieght of the satellite on the surface of the earth
A composite bar oflength L = L1 + L2 is made from a bar of material 1 and length L1 attached to a bar of material 2, Show that the coefficient of linear expansion
Unpolarized light is incident on a linearly polarizing filter oriented 30 degrees with respect to the horizontal. find the final intensity that emerges from the last polarizing filter
Assume that Young's Modulus for bone is 1.50 1010 N/m2 and that the bone will fracture if more than 1.50 108 N/m2 is exerted. What is the maximum force that can be exerted on the femur bone
imagine that you recently found out you live close to a superfund site. identify the most important information you
If she is served 200 of coffee at 85 in a well-insulated container, how much ice at 0 must she add to obtain a final temperature of 33.
The ball strikes the floor at a speed of 7.8 m/s. Illustrate what was the initial speed of the ball? Assume that air resistance is negligible.
A siren has a frequency of 875 Hz when it and an observer are both at rest. The observer then starts to move and finds that the frequency he hears is 1251 Hz. What is the speed of the observer
A point charge +6.7 uC is placed at the origin, and a second charge -3.6 uC is placed in the X - Y plane at (0.40 m , 0.55 m ). Where should a third charge be placed in the plane
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