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Q. Sources A and B emit long-range radio waves of wavelength 530 m, with the phase of the emission from A ahead of that from source B by 90°. The distance rA from A to a detector is greater than the corresponding distance rB from B by 110 m. What is the magnitude of the phase difference at the detector?
Q. A 20kg child is on a swing that hangs from 3m long chains, what is her speed initially at the bottom of the arc if she swings out at a 45 degree angle before reversing action?
A force F = 200i - 400j + FZ k N, is acting through point A(0,0,0) m.
Two 2.0cm x 2.0cm plates that form a parallel-plate capacitor are charged to (+/-) 0.708 nC.what are the electric field strength inside and the potential difference across the capacitor if the spacing between plates.
An orienter runs the following course: 100 m at 35 degrees, 150 m at 220 degrees, and 50 meters at 170 degrees. find the resultant displacement.
Calculate the speed of block at the instant the dielectric leaves the capacitor assuming it starts at rest and that the voltage across capacitor after the dielectric is removed is measured to be 200 V.
A toy train is pushed forward and released at x_0 = 2m with a speed of 2m/s. It rolls at a steady speed for 2s, and then one wheel begins to stick. The train comes to a stop 6m from the point at which it was released. What is the magnitude of trai..
A ceiling fan with 89 diameter blades is turning at 65. Presume the fan coasts to a stop 30 after being turned off. Throughout how many revolutions does the fan turn while stopping.
A hollow aluminium cylinder is to be fitted over a steel piston. At 22°C the inside diameter of the cylinder is 99.2 percent of the outside diameter of the piston. To what common temperature must the two pieces be heated in order that the cylinder ju..
Two force vectors point in opposite directions and have the same magnitude. If their magnitudes are 36.5 Newton’s, then what is the magnitude of their sum?
At what angle have to the laser beam in the diagram be aimed at mirrored ceiling in order to hit the midpoint of the far wall? The length of the room is a=4.9 m and its height is b=3.00 m.
Estimate the speed of the water just before striking the turbine blades (overlook air resistance).
What are the d irections of electric field
An autographed baseball rolls off a 0.64m high desk and strikes the floor 0.61 m away from the desk. How fast was it rolling on the desk before it fell off? The acceleration of gravity is 9.80 m/s^2.
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