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An aluminum rod has a resistance of 3.30 ? at 20.0°C. Calculate the resistance of the rod at 120°C by accounting for the changes in both the resistivity and the dimensions of the rod. The coefficient of linear expansion for aluminum is 2.40 10-5 (°C)?1. ?
Aparallel-plate capacitor has square plates of edgelength 1.2 cm and a platespacing of 0.11 mm. If the gap between the plates is filled with mica, what is the capacitance?
You are part of a search-and-rescue mission that has been called out to look for a lost explorer. You've found the missing explorer, What minimum speed must the rocket have just before impact in order to save the explorer's life
The tension in the string when the ball is at the very bottom of the circle is 4.3 N. At the very bottom of the circle, a very sharp knife is suddenly inserted, to cut the string directly below point of support. How far to the right of where the s..
The place you get your hair cut has two nearly parallel mirrors 7.0 m apart. As you sit in the chair, your head is 1.0 m from the nearer mirror. Looking toward this mirror, you first see your face and then, farther away, the back of your head.
Astrophysicists in the 1960s tried to explain the existence and the structure of pulsars - extremely regular astronomical sources of radio pulses whose periods ranged from seconds to milliseconds. Estimate the rotation rate of the Sun
A puck on a frictionless, horizontal air table is attached to a string that passes down through a hole in the table. what is the new speed of the puck
The velocity v of waves on a vibrating string depends on the tension T in the string and the mass per unit length λ of the string. Derive an expression for v by using the dimensional analysis method
How long will it take until the sun has used up all the hydrogen atoms in the core (the central 10%)? That is, what is the main-sequence lifetime of the sun and compare the lifetime of the sun to the current age.
A wheel and axle has its matter distributed like a solid disk. (I=1/mR^2) It has a radius of 0.60m and a mass of 0.50kg, how many turns does the wheel make in 2.0sec
Calculate the earth’s radiative temperature (TE) for an albedo value of 0.27, 0.30 and 0.33. Then estimate the surface temperature using a reasonable estimate of the temperature increase due to the greenhouse effect. Summarize the scientifically vali..
You are in a kayak which can move at a velocity of 2.6 m/s when in still water. You are attempting to cross a river which is 110 across, How long does it take you to get to the other side
A test tone used on a radio has a frequency of 974 Hz. What is the wavelength of this sound in air at normal room temperature
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