In a hydrogen atom, a given electron has n = 7. How many possible values can ? have?
A) 6
B) 7
C) 15
D) 98
B
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According to general relativity, a black hole is
A) an object that cannot be seen. B) a hole in the observable universe. C) a place where light travels slower than the normal speed of light. D) a place where light travels faster than the normal speed of light. E) a place where there is no gravity.
In a smoke detector americium (A = 95) transmutes to neptunium (A = 93) by
A) beta emission. B) alpha emission. C) gamma emission. D) none of the above
An electric heater draws an average power of 1100 watts when plugged into a 110 V rms outlet. Calculate the resistance of the heater and the rms current
a. 11 ?, 10 A (rms) b. 110 ?, 10 A (rms) c. 10 ?, 11 A (rms) d. 10 ?, 110 A (rms) e. 0.09 ?, 11 A (rms)
A wheel rotates about a fixed axis with a constant angular acceleration of 4.0 rad/s2 . The diameter of the wheel is 40 cm. What is the linear speed of a point on the rim of this wheel at an instant when that point has a total linear acceleration with a magnitude of 1.2 m/s2?
a. 39 cm/s b. 42 cm/s c. 45 cm/s d. 35 cm/s e. 53 cm/s