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A wire of radius 1.5 mm carries a current of 2.8 A. The potential difference between points on the wire 20 m apart is 4.7V. What are
a) the electric field in the wire and
b) the resistivity p of the material of which the wire is made?
The coefficient of volume expansion of coffee is the same as that of water. How much coffee (in cubic meters) has spilled out of the beaker.
How many moles of gas are in a balloon with a volume of 5.07 liters at a temperature of 298 K and a pressure of 1.11 atm
The force stretching the D string on a certain guitar is 170 N. The string's linear mass density is 0.006 kg/m, What is the speed of the waves on the string
A staging that weighs 440 N supports two painters, one 110 N and the other 460 N. The reading in the left scale is Ft = 800 N. What is the reading Fr, in the right hand scale.
A 270 m wide river flows due east at a uniform speed of 2.30 m/s. A boat with the speed of 8.4 m/s relative to water leaves the south bank pointed in a direction 38o west of north. What is (a) magnitude and (b) direction of the boat's velocity rel..
Suppose a tank contains 505 m3 of neon (Ne) at an absolute pressure of 1.01Ã-105 Pa. The temperature is changed from 293.2 to 295.8 K
A small glass bead charged to 7.4nC is in the plane that bisects a thin, uniformly charged, 10-cm-long glass rod, What is the total charge on the rod
A rifle bullet with mass 8.00g strikes and embeds itself in a block with a mass of 0.992 kg that rests on a frictionless, Find the magnitude of the block's velocity just after impact
An empty capacitor is capable of storing 1.0 × 10-4 J of energy when connected to a certain battery. If the distance between the plates is halved and then filled with a dielectric, how much energy could this modified capacitor store when connected..
A proton with an initial velocity of (1.0x + 2.0y + 3.0z) x 10^5 m/s enters a megnetic field of 0.50z T. Find the magnitude of the force on the proton. The mass of the proton is 1.67 x 10^-27 kg.
A heat engine has an efficiency of 25%, and its heat input is 600 J per cycle from the high-temperature reservoir
On a clear day at a certain location, a 100 V/m vertical electric field exists near the Earth's surface. Compute the energy density of the electric field
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