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A 12.0 V battery has an internal resistance of 0.080 ohm. If the battery supplies 100 A when connected to a starter motor, what is the resistance of the motor?
A 6.0 ohm resistor and a 3.0 ohm resistor are connected in parallel to a 1.5 V battery of negligible internal resistance. What is the current in the 3.0 ohm resistor?
Find the force exerted by these charges on a fourth charge q = +3 nC at the remaining (upper right) corner. (Assume the +x axis is directed to the right and the +y axis is directed upward.)
A pair of eyeglass frames are made of an epoxy plastic (coefficient of linear expansion = 1.30 10-4°C-1). At room temperature (20.0°C), the frames have circular lens holes 2.20 cm in radius.
A 1.5-kg mass attached to spring with a force constant of 20.0 N/m oscillates on a horizontal, frictionless track. At t = 0, the mass is released from rest at x = 10.0 cm. ( That is, the spring is
The resistance of a wire increases 3.9% when the temperature of the wire is raised 100°C. What is the temperature coefficient of resistivity of the wire material?
A 2.50 A current is carried by a copper wire of radius 1.0 mm. If the density of conduction electrons is 8.0E28/m3, what is the drift velocity of the conduction electrons?
A mass less vertical spring is displaced 0.15 m when a 3.25 kg mass is attached. When used horizontally, what is the total energy ff the spring has an amplitude of 0.25 m?
An attack helicopter is equipped with a 20mm cannon tat fires 112 g shells in the foward derection with a muzzle speed of 743 m/s. The fully loaded helicopter has a mass of 1630 kg. A burst of 238 s
Markings to indicate length are placed on a steel tape in a room that is at a temperature of 22°C. Measurements are then made with the same tape on a day when the temperature is 27°C. Are t
A physics student throws a bowling ball straight up into the air. THe ball was in the air for a total of 8.44 seconeds before it was caught at its orignial position. What was the intial velocity of
Solar cells can produce 39.8 W of electricity per square meter of surface area if directly facing the Sun. How large an area is needed to supply the needs of a house that requires 23.3 kWh/day? (As
A hockey player makes a slap shot exerting a force of 30 N on a 0.115 kg hockey puck for 0.16 seconds. How fast is it moving after he hit the puck assuming it started from rest?
Set up the equation of motion in the xy plane and solve for the radius of the curvature and the trajectory when the magnetic field is small. (Hint: the velocity component in the x-direction is virtu
The radius of gyration of the wheel is 0.3 m. A 1.2 kg mass hangs at the end of a cord that is wound around th rim of the wheel. This mass falls and causes the wheel to rotate. What is the accelerat
During an expansion process, the pressure of a gas changes from 100 to 700 kPa according to the relation "P=aV+B", where a=1220 kPa/m^3 and b is a constant. If the initial volume of the gas is 0.2 m
A sample of blood is placed in a centrifuge of radius 13.0 cm. The mass of a red blood cell is 3.0 multiplied by 10-16 kg, and the magnitude of the force acting on it as it settles out of the plasma i
A boat has a mass of 6800 kg. Its engines generate a drive force of 4100 N, due west, while the wind exerts a force of 740 N, due east, and the water exerts a resistive force of 1200 N due east. Wha
What is the formula that describes how the acceleration of an object on an inclined plane depends on the angle the incline is elevated (with respect to the horizontal)?
Particle A of charge 7.00 10-4 C is at the origin, particle B of charge -8.00 10-4 C is at (6.00 m, 0) and particle C of charge 2.00 10-4 C is at (0, 4.00 m). (a) What is the x-component of the elec
A parallel plate capacitor has plates each of area 100 cm2 and with separation 0.25 mm. If this capacitor is charged with 25 pC, what is the average charge density on the positive plate?
A parallel plate capacitor is charged to 12 V and the voltage source is then disconnected. When the air space between the plates is then filled with a dielectric of constant 6.0, what is the resulti
When an insulator with dielectric constant 5.0 is inserted between the plates, what happens to the electric field strength if the surface charge density does not change?
A magnetic field Hz is now superimposed. Set up the equation of motion in the xy plane and solve for the radius of the curvature and the trajectory when the magnetic field is small. (Hint: the veloc
a. Doubling both charges changes the potential energy for a pair of a pint charges by a factor of? b. Tripling the separation between charges changes the potential energy of a pair of a point charges