The critical angle is that angle of incidence for which the angle of refraction equals ______
Fill in the blank(s) with correct word
90 degrees
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Based on the frequency with which we see comets from Earth, astronomers estimate the total number of comets in the solar system to be
A) 100 million. B) 1 billion. C) 10 billion. D) 100 billion. E) 1 trillion.
A horizontal force of 40 N pushes an object of mass 5.0 kg up an inclined plane through a distance of 1.6 m measured along the plane. The plane is inclined at an angle of 30° to the horizontal. Neglect friction and use g = 10 m/s2
(a) What is the work done by the horizontal force on the object? (b) What is the work done by the net force on the object? (c) What is the work done by the normal force on the object?
What is the kinetic energy of an electron in the n = 2 Bohr orbit of the hydrogen atom?
A) 2.71 × 10-19 J B) 3.20 × 10-19 J C) 5.45 × 10-19 J D) 6.10 × 10-19 J E) 2.16 × 10-18 J
The average power input to a series alternating current circuit is minimum when
a. there are only a resistor and capacitor in the circuit. b. there are only a resistor and inductor in the circuit. c. there is only a resistor in the circuit. d. XL = XC and the circuit contains a resistor, an inductor and a capacitor. e. there is only a capacitor in the circuit.