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A student is reading a lecture written on a blackboard. The lenses in her eyes have a refractive power of 54.66 diopters, and the lens-to-retina distance is 1.882 cm. (a) How far is the blackboard from her eyes? (b) If the writing on the blackboard is 6.93 cm high, what is the height of the image on her retina?
A supersonic jet passes directly overhead at an altitude of 13,265 m, traveling at 680 m/s, or mach 2. How much time elapses before you hear the sonic boom
a solenoid with a certain number of turns n and carrying a current of 2.000 a has a length of 34.00 cm. if the
A dipole is formed by point charges +3.8 micro Coulomb and -3.8 micro Coulomb placed on the axis at (0.45 m, 0) and (-0.45m, 0), respectively. At what positions on the axis does the potential have the value 7.7×105 V? There should be an x1 and an ..
A solid conducting sphere with a radius of 35.4 cm contains atotal charge of 5.46 mC, evenly distributed over its surface.(a) What is the direction of the electric field at its surface? (b)What is the strength of the electric field at its surface?
A parallel-plate capacitor with circular plates of radius 65 mm is being discharged by a current of 7.5 A. What is that maximum value
The fan blades on a jet engine make one thousand revolutions in a time of 50.7 ms. What is the angular frequency of the blades
The height of a helicopter above the ground is given by h = 2.95t^3, where h is in meters and t is in seconds. At t = 2.50 s, the helicopter releases a small mailbag.
Two small non conducting spheres have a total charge of 85.2. When placed 1.09 apart, the force each exerts on the other is 10.4 and is repulsive. What is the charge on each.
At what driving frequency fd do two phasors have the same length? At that driving frequency, what are (c) the phase angle in degrees, (d) the angular speed at which the phasors rotate, and (e) the current amplitude?
An RLC circuit has a sinusoidal voltage supplied to it at 158 kHz with a peak voltage of 172 V; a 45 k? resistance; What is the peak current for this circuit
An outside loudspeaker (considered a small source) emits sound waves with a power output of 120 W. Find the intensity level in decibels at that distance
Light rays in a material with index of refrection 1.25 can undergo total internal reflection, Find this material's index of refraction when the required critical angle is 67.9°
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