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four charges q=4nC form a square, 20 cm on a side. what is the potential of electric field at the center of the square?
A spherical balloon of volume 4.03 x10^3 cm3 contains helium at the pressure of 1.15 x10^5 Pa. How various moles of helium are in the balloon if the average kinetic energy of the helium atoms is 3.60 x10-22 J.
Consider laser eye surgery, in which laser light with a wavelength of 426 nm at a power output of 1.6 W is used to reattach a detached retina. how many photons are emitted by the laser
The four strings pass over the bridge of a violin, as shown below. The strings make and angle of 72.0° with the normal to the plane of the instrument on either side of the bridge. Determine the tension in the strings
If the police car accelerates uniformly at 3.00m/s^2 and overtakes the speeder after accelerating for 9.00 s, illustrate what was the speeder's speed?
A uniform disk of mass m=0.400 kg and radius R=20.0 cm is pinned to the wall near its rim. Find the angular frequency of oscillation if the disk is set swing back and forth
Prove that Wien's displacement law for? max requires that E=hv in the Planck radiation law. (Please do not give me links or a one line solution). Thanks.
starting from rest a car travels 1350 m in 1 minute. it accelerated at 1 m/s^2 untill it reached its cruising speed. what was its cruising speed
A person with a mass of 71.6 kg and a volume of 0.089 m3 floats quietly in water. find the volume of the person that is above the water
The transformer on a utility pole steps the voltage down from 10000 V to 220 V for use in a college science building. At what rate is heat lost in the nonideal transformer
A 77.0-? resistor is connected in series with a 32.0-µF capacitor and a source whose maximum voltage is 123 V, operating at 60.0 Hz. Find the capacitive reactance of the circuit
A radio-frequency EM plane wave propagates in the x direction. Your radio gets the best reception when its antenna is parallel to the y-z plane, at a 30° angle to the y axis. Sketch this situation, and indicate the direction of the E and B vectors..
q1. a 1590 kg car starts from rest on a horizontal road and gains a speed of 61 kmh in 30 s a what is its kinetic
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