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Two spherical balls have volumes in the ratio of 27:1. What is the ratio of their surface areas
A student decides to move a box of books into her dormitory room by pulling on a rope attached to the box. If the coefficient of friction is unchanged, what is the new acceleration of the box
The current in a coil drops from 3.1 A to 2.6 A in 0.53 s. If the average emf induced in the coil is 12 mV, what is the self-inductance of the coil
A technician wraps wire around a tube of length 37 cm having a diameter of 8.3 cm. If the current in this solenoid increases at the rate of 2 A/s, what is the self-induced emf in the solenoid
A metal sphere is filled with ammonia as part of a refrigeration device. what is the mass of the ammonia if it fills up half of the sphere
A stream of protons and electrons are shot horizontally (from the left edge of the page to the right) with a speed of 1.2 x 10^6 m/s, What is the radius of the curvature and the direction for the cur
We can approximate an electron moving in a nanowire as a one-dimensional in?nite square-well potential. What are the three lowest energy levels of the electrons
A closely wound rectangular coil of 100 turns has dimensions of 20.0{\rm cm} by 50.0{\rm cm}. What is the average emf induced in the coil
A common flashlight bulb is rated at 0.300 A and 2.60 V, what is the temperature of the filament when the bulb is on? Calculate in deg Celsius
A horizontal spring with a spring constant of 0.6 N/m sits on a frictionless table, What is the magnitude of the elastic force on the mass just after it is released
Two events in reference frame S occur 10?s apart at the same point in space. The distance between the two events is 2400 m in reference frame S?, What is the time interval between the events in refe
One of the wavelengths of light emitted by hydrogen atoms under normal laboratory conditions is at ?0 = 656.3nm in the red portion of the electromagnetic spectrum, How fast are the emitting atoms mo
A toroidal solenoid has a mean radius of 18.00 cm and a cross-sectional area of 3.00 cm^2, What is the mutual inductance of these coils
Two shuffleboard disks of equal mass, one orange and the other yellow, are involved in an elastic, glancing collision. Determine the final speed of each disk
a circular wire coil with resistance 1.4 and an area 5.0x10^-3m^2 lies perpendicular to a magnetic field that's increasing at 2.0T/s, how many turns are in the coil?
A 10.0-g wad of sticky clay is hurled horizontally at a 110-g wooden block initially at rest on a horizontal surface. what was the speed of the clay immediately before impact
A tennis player receives a shot with the ball (0.060 0 kg) traveling horizontally at 52.5 m/s and returns the shot with the ball traveling horizontally at 38.5 m/s in the opposite direction
Determine the current density, resistance and electric for the copper wire, if the wire is 10 m long
A 300g ball on a 70-cm-long string is swung in a vertical circle about a point 200 cm above the floor. What was the tension in the string an instant before it broke
A 500g ball swings in a vertical circle at the end of a 1.5-m-long string. When the ball is at the bottom of the circle, the tension in the string is 12N
Two large, parallel, conducting plates are 17 cm apart and have charges of equal magnitude and opposite sign on their facing surfaces, Find the electric field at the position of the electron
Light of wavelength 500nm is incident normally on a diffracation grating. Determine the total number of primary maxima that can be observed in this situation
A string of length L vibrates at its fundamental frequency. What is the amplitude of each of the traveling waves that form this standing wave
In a laboratory experiment, one end of a horizontal string is tied to a support while the other end passes over a frictionless pulley and is tied to a 1.9kg sphere, What is the diameter of the spher
A 0.57-mH inductor and a 131-? resistor are placed in series with a 24-V battery. What is the maximum energy stored in the inductor