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A 150 ohm combination of resistors draws 2 mA of current when connected across a battery. If you now add a 1 ohm resistor in series with this combination, there will be hardly any change in the curr
A wire has a current density of 17 A/mm2. If the drift velocity is 4.8×10-8 m/s, how many free electrons does the wire have in a 1.0 m length? The radius of the wire is 1.0 mm.
A wire 2.0mm in diameter and 4cmlong is connected to a 12V battery. If the resistivity of the wire is 3.5 x 10^-5 ohm-m; calculate the resistance of wire and its current?
An electron moving with a velocity of 2.7 x10^6 m/s in the positive x direction enters a region where there is a uniform 4.3 T magnetic eld at angle of 45 with the x-axis.
Suppose you have two positive point charges and want to move them closer together. To do the least amount of work, you should move them directly toward each other; any other path will require more w
What is the angular seperation between adjacent maxima? At what distance from the midline does the first minima fall on the screen?
Find the resulting change in length of this composite wire if an object with a mass of 5.00 kg is hung vertically from one of its ends.
Suppose a rocket ship in deep space moves with constant acceleration equal to 9.80 m/s2, which gives the illusion of normal gravity during the flight.
A uniform meter stick is in static rotational equilibrium when a mass of 220g is suspended from the 5.0-cm mark, a mass of 120g is suspended from the 90-cm mark, and the support stand is placed at t
Eight 5 µC charges are located at the vertices of a unit cube centered about the origin with 1.0 mm edges. How much work does it take to bring a 2 µC charge from infinity to the origin?
A 6.5-µF capacitor is connected in series with 4.2 MO resistor, and this combination is connected across an ideal 20-V DC battery. What is the current in the circuit when the capacitor has reac
A 68.5 kg astronaut is doing a repair on the space station. She throws a 2.25 kg tool away from her at 3.20 m/s. With what speed and direction will she begin to move?
A spaceship moving away from Earth at 0.67 c fires a particle beam toward Earth, with speed 0.74 c relative to the ship. At what speed does Earth receive the particles? At what speed does Earth rece
A boy and a girl are balanced on a massless seesaw. The boy has a mass of 75 kg and the girls mass is 50 kg. If the boy sits 2.0 meters from the pivot point on one side of the seesaw, where must the
Find the magnitude of the torque on the coil when the magnetic field makes an angle of 26° with the normal to the plane of the coil.
Light with a frequency of 2 X 10^15 Hz shines on a copper surface (=4.70 eV). What is the maximum kinetic energy of the photoelectrons?
If the total length of wire is 18 m, how much power is dissipated in the wiring?
A 78.3 kg weight-watcher wishes to climb a mountain to work off the equivalent of a large piece of chocolate cake rated at 522 (food) Calories. How high must the person climb? (1 (food) Calorie = 10
Calculate the y-component of the magnetic force acting on a piece of wire of length L = 18.0cm.
A bridge is made with segments of concrete 94 m long (at the original temperature). If the linear expansion coefficient is 1.2 × 10-5 (C)-1, how much spacing is needed to allow for expansion fo
Without moving, you will suddenly see the penny magically appear. If you look into the cup at an angle of 70.0 Degrees to the normal, at what angle to the normal must the penny be located in order f
Explain why the light emitted when an electron makes this move in a sodium atom is a different color than the light emitted by an electron moving from fourth to the second level of a hydrogen ato
The ramp for Disk A has friction and it rolls up the ramp 12 cm before rolling back down the ramp. The ramp for Disk B is frictionless. Which disk rolls up the farthest?
When you draw a current of 0.281 A from it, the potential difference between its terminals is 5.43 V. What is the potential difference when you draw 0.511 A?
0.14 kg of water at 88.0 deg C is poured into an insulated cup containing 0.234 kg of ice initally at 0 deg. Calculate the mass of liquid when the system reaches thermal equilibrium.