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Two astronauts are 1.60 m apart in their spaceship. One speaks to the other. The conversation is transmitted to earth via electromagnetic waves. The time it takes for sound waves to travel at 328 m/s through the air between the astronauts equals the time it takes for the electromagnetic waves to travel to the earth. How far away from the earth is the spaceship?
Billy throws a ball straight up and it rises 22 meters into the sky. With what initial velocity must he have thrown the ball
A square wire loop with 1.5 m sides is perpendicular to a uniform magnetic field, with half the area of the loop in the field. The loop contains an ideal battery with emf = 19 V. find the direction of the net emf in the circuit
A spaceship containing an astronaut travels at a speed of 0.50 c relative to a second inertial observer. What is the total energy of the astronaut according to the astronaut if her mass is 70kg
A wire whose resistance si R120ohm is cut in 7 equally longpecies, which are then connected in parallel way. What is the resistance of the parallel contribution
A transformer is to be utilized to provide power for a computer disk drive that needs 6.0V (rms) instead of the 120 V (rms) from the wall outlet. The number of turns in the primary is 400. Discover the number of turns in the secondary?
A small welding machine uses a voltage source of 120 V at 60 Hz. When the source is operating, it requires 1200 W of power, and the power factor is .75. FInd the rms current in the machine while operating
For the motion from the initial free until the piece of wood comes to rest, what is the total amount of work completed by friction.
Two loudspeakers in a 20°C room emit 629 Hz sound waves along the x-axis, If the speakers are out of phase, what is the smallest distance between the speakers for which the interference of the sound waves is constructive
The tangential speed of a particle on a rotating wheel is 3.5m/s. how long will the particle take to make one revolution
Two mirrors form a vertex with an angle of 128°. If a ray of light strikes mirror 1 with an angle of incidence of 48°, find the angle of reflection of the ray when it leaves mirror 2
Consider two closely spaced and oppositely charged parallel metal plates. The plates are square with sides of length L and carry charges Q and -Q on their facing surfaces. What is the magnitude of the electric field in the region between the plate..
A small metal ball is given a negative charge, then brought near (i.e., within a few millimetres) to end A of the rod. What happens to end A of the rod when the ball approaches it closely this first time.
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