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A spacecraft moving away from Earth emits a 4496 Hz signal. Ascientist on Earth measures the signal to be 4494 Hz. What is thespeed of the spacecraft relative to Earth?
An object of interest is 3 mm from an objective for a compound microscope with a lens power of +250 D. what is the magnifying power of the eyepiece
A rope, under a tension of 90N and fixed at both ends, oscillates in a second-harmonic standing wave pattern. What is the mass of the rope
while the tilt angle theta equals 75 degrees is held constant, the load is slowly lifted vertically by a winch until the length of the vertical cable is negligible, and the load mass effectively sits at the upper end of the beam.
If the frequency that is supplied is set at the circuit's resonance frequency, what is the rms voltage across each of the circuit elements
Two point charges q1 = 3.0 x 10-8 C and q2 = 2.0 x 10-8 C are located on the x axis at x1 = 0.2 m and x2 = -0.3 m
a carnot engine operates with an efficiency of 23.0 when the temperature of its cold reservoir is 274 k. assuming that
A pitcher throws a 0.140-kg baseball, and it approaches the bat at a speed of 50m/s. The bat does Wnc = 70J of work on the ball in hitting it. Ignoring air resistance, determine the speed of the ball after the ball leaves the bat and is 25.0 m abo..
Each plate of a parallel-plate air-filled capacitor has an area of 0.0020 m2, What is the surface charge density on the plates
An ac generator emf is E= Em sin wd t, with Em = 30.0 V andwd = 309 rad/s. It is connected to a 17.1 H inductor. What is the maximum value of the current
The three displacement vectors in the drawing have magnitudes of A = 5.47 m, B = 5.43 m, and C = 3.91 m. Find the resultant ((a) magnitude and (b) directional angle) of the three vectors by means of the component method. Express the directional an..
a. find the boiling temperature of a juice that is boiling at an absolute pressure of 31.19 kpa. assume that the
A 30nC charged particle and a 50nC charged particle are near each other. what is the magnitude of the electric field at its original position
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