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

Physics & Space Science

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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).

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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

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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

Physics & Space Science

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?

Physics & Space Science