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Find what minimum amount of electromagnetic energy is needed to produce an electron and a positron together? A positron is a particle with the equal mass as an electron, but has the opposite charge.
A lighthouse sweeps its ray of light around in a circle once every 7.4 s. To an observer in a spaceship moving away from Earth, the ray of light completes one full circle every 11 s. What is the speed of the spaceship relative to Earth?
An object is 13 cm in front of a convex mirror whose focallength magnitude is 9cm and the magnitude of the distance is 5.3 cmfrom the image to the mirror. Is the image formed real orvirtual, and is it on the same side of the mirror as the object orth..
a rectangular loop of wire that is 55 cm wide and 20 cm long is placed in a region where the magnetic field is b 0.4
A 33-kg girl is bouncing on a trampoline. During a certaininterval after leaving the surface of the trampoline, her kineticenergy decreases to 190 J from 450 J. How high does she rise during this interval?
A soccer player kicks a rock horizontally off a 40.0 m high cliffinto a pool of water. what was the initial speed given to the rock
In a parallel circuit I=10.0A. There are 4 resistors. R1=13ohms R2=7ohms R3=15ohms R4=21ohms. What is the voltage drop across each resistance
One section of a steel railroad track is 27 m long. If its temperature increases by 22 K during the day, how much does the track expand
Calculate the cutoff frequency of the dominant mode and determine how many modes are passed at three times cutoff frequency of dominant mode and calculate the cutoff frequency of the dominant mode
An 8 lb weight stretches a spring 4ft, the system resides in amedium offering a resistance to the motion equal to 1.5 times theinstantaneous velocity, if the weight is released at a position 2ftabove its equilibrium position with downward velocity of..
A small object is located 31.1 centimeter in front of a concave mirror with a radius of curvature of 38.5 centimeter. Estimate where will the image be formed
a crowbar 2m long is used to lift a rock 800n. if the fulcrum is 0.25m from where the crowbar touches the rock, how much effort must be applied to move the rock
A velocity selector has a magnetic field of magnitude 0.28 G perpendicular to an electric field of magnitude 0.43 kV/m. What energy must electrons have to pass through undeflected
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