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A wire of unknown material has a cross-sectional area 7 mm2 and length 15 cm. The wire carries current density J = 4 ?C/s/m2 and has a voltage difference of 25 V held constant across its ends.
What is total current in the wire?
What is the resistivity of the unknown material?
At what rate is electromechanical energy being converted into thermal energy in this wire?
If the unknown material has a free electron density of 8 x 1028 electrons/m3, how long does it take for an electron to travel the length of the wire?
A wooden block with mass 0.33kg rests on a horizontal table, connected to a string that hangs vertically over a friction-less pulley on the table's edge, Find the block's acceleration if k =0.18.
A cube of ice is taken from the freezer at -8.7^circ C and placed in a 114 g aluminium calorimeter filled with 329 g of water at room temperature of 20.0 ^circ {rm C}. The final situation is observed to be all water at 15.0^circ C.
The vapor pressure of benzene is 100 mm Hg at 26.1 C and 400 mm Hg at 60.6 C. Estimate the heat of vaporazitaion of benzene in this temperature range
Find the work done by 2.54 moles of an ideal gas if its volume doubles at a constant temperature of 23.6°C. Find the heat absorbed by the gas
An Atwood system which has two masses, m1 = 2 kg and m2 = 2.1 kg. What is the net force on this system
A jeweler working with a heated 43 gram gold ring must lower the ring's temperature t make it safe to handle. If the ring is initially at 94 degrees Celsius, what mass of water at 22 degrees Celsius is necessary to lower the ring's temperature to 38 ..
An ideal gas expands at constant pressure of 5.0 atm. from 240 milliliters to 630 milliliters, Calculate the total work (in joules) done by the gas in the process
The resultant displacement has a magnitude of 6.6m directed at the angle of 137 degrees from the positive x axis.
The bar is held by a cord that makes a 90? angle with respect to bar and 50 ? with respect to wall. Illustrate what is the magnitude of the horizontal force Hx on the pivot? The acceleration of gravity is 9.8 m/s2.
Light of wavelength 450 nm falls on the 0.48 mm wide slit and forms a diffraction pattern on a screen 1.1 m away.
A 45 dB sound wave strikes an eardrum whose area is 4.1 × 10-5 m2. How much energy is received by the eardrum per second
A proton is propelled at 2 x 10^6 m/s perpendicular to a uniform magnetic field. If it experiences a magnetic force of 5.8 x 10^-11 N, find the strength of the megnetic field
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