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Question: A portable CD player operates with a current of 27mA at a potential difference of 4.2 V. What is the power usage of the player?
An electron with 184eV of kinetic energy in free space passes over a finite potential well 72eV deep that stretches from x=0 to \(x = 0.5\) nm. What is the electron's wavelength in free space
Imagine that we define the rear end of a train 120 m long to long to define the origin X'=0 in the train frame and we define a certain track signal light to define the origin X=0 in the track frame. Where does this event occur in the train frame
Assume the equation x = At3 + Bt describes the motion of a particular object, Determine the dimensions of the derivative: dx/dt
A simple pendulum makes 140 complete oscillations in 2.50 min at a location where g = 9.80 m/s2. Find the period of the pendulum
A casette player is said to have a signal-to-noise ratio of 58 dB, whereas for a CD player it is 95 dB. What is the ratio of intensities of the signal and the background noise for each device?
A "swing" ride at a carnival consists of chairs that are swung in a circle by 12.0 m cables attached to a vertical rotating pole, as the drawing shows. Determine the tension in the cable attached to the chair
A lamp which is 11.5 cm tall is in front of a concave mirror which has a focal length of 66.0 cm. How tall is the lamp's image if the lamp is a distance of 39.6 cm from the mirror
What is the direction of the first ball after the collision? obtain the direction as an angle south of east.
A compound microscope has a barrel length of 163.0 mm and an objective with a 4.110-mm focal length. Find the angular magnification of the eyepiece
In a certain experiment, a radio transmitter emits sinusoidal electromagnetic waves of frequency 105.0 in opposite directions inside a narrow cavity with reflectors at both ends, How far apart are the nodal planes of the magnetic field
A uniform 1200N beam that is 3.50 m long is suspended horizontally by two vertical wires at its ends. what will be the initial angular acceleration of the system
how far did the last car travel before momentarily coming to a rest. A 3 kg block accelerates at a rate twice that of a 6 kg block. Is the net force acting on the 3kg block twice as large as that acting on 6kg block.
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