What is a major problem with refracting telescopes?
Answer: Chromatic abborarion
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In a series circuit of three identical lamps powered by a 1.5-volt dry cell, the voltage across each lamp is
1) 1/2 V. 2) 1 V. 3) 1-1/2 V. If any one of the lamps is disconnected, the other lamps will 4) go out. 5) continue to glow.
A plane has an eastward heading with an airspeed of 156 m/s. A 20.0 m/s wind is blowing southward at the same time as the plane is flying. The velocity of the plane relative to the ground is
A) 155 m/s at an angle 7.36° south of east. B) 155 m/s at an angle 7.36° east of south. C) 157 m/s at an angle 7.31° south of east. D) 157 m/s at an angle 7.31° east of south. E) 157 m/s at an angle 7.36° south of east.
A particle with charge -40.0 nC is on the x axis at the point with coordinate x = 0. A second particle, with charge -20.0 nC, is on the x axis at x = 0.500 m. There is a point between x = 0 and x = 500 mm where the electric field is zero. Is the electric potential zero at this point?
1.No; it is positive. 2.Yes. 3.No; it is negative.
Answer the following statement(s) true (T) or false (F)
1. At time t = 0 a person is sliding due east on a flat, frictionless plane of ice. The net force on this person is due to a battery-powered fan the person holds that exerts a southward thrust force on the person. Assuming that drag is negligible, the eastward component of the person’s velocity is unaffected by this force.