At what rate is power supplied by the 10-V emf shown below?
a.
?10 W
b.
+10 W
c.
zero
d.
+20 W
e.
?20 W
b
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Terminal Voltage and Internal Resistance: When an external resistor of resistance R1 = 14 ? is connected across the terminals of a battery, a current of 6.0 A flows 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.
Fill in the blank(s) with the appropriate word(s).
In the double-slit experiment, fringes are more widely spaced when illumination is with monochromatic
A) low-frequency light. B) high-frequency light. C) polarized light. D) none of the above
An automobile manufacturer claims that its product will, starting from rest, travel 0.40 km in 9.0 s. What is the magnitude of the constant acceleration required to do this?
A. 9.9 m/s2 B. 8.9 m/s2 C. 6.6 m/s2 D. 5.6 m/s2 E. 4.6 m/s2
Originally 2.00 mol of gas are at STP. If the temperature changes to 47.0°C and the pressure decreases to half of what it was, how many liters do the two moles now occupy? (1 atm = 101 kPa, R = 8.31 J/mol ? K)
What will be an ideal response?