When an external resistor of resistance R1 = 14 ? is connected across the terminals of a battery, there is a current of 6.0 A through the resistor
When a different external resistor of resistance R2 = 64.4 ? is connected instead, the current is 2.0 A. Calculate (a) the emf of the battery and (b) the internal resistance of the battery.
(a) 150 V (b) 11 Ω
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Consider a long thin straight wire with a current I. Which of the following statements about the magnetic field lines is true?
A. Field lines are parallel to the wire.
B. Field lines are perpendicular to the wire.
C. Field lines are directed radially away from the wire.
D. Field lines are circles centered on any point on the wire.
An object starts with an initial velocity of 4.0 m/s and accelerates with an acceleration of +4.0 
for 6.0 seconds. It then decelerates at -2.0 
until its velocity is 4.0 m/s. The total distance covered is
A. 67 m. B. 94 m. C. 105 m. D. 192 m. E. 215 m.
If a proton and an electron have the same momentum, the longer wavelength belongs to the
A) proton. B) electron. C) both the same
Which of the following statements best describes the two principle advantages of telescopes over eyes?
A) Telescopes can collect far more light with far greater magnification. B) Telescopes have much more magnification and better angular resolution. C) Telescopes collect more light and are unaffected by twinkling. D) Telescopes can collect far more light with far better angular resolution.