An ideal Carnot engine operating between a warm reservoir of unknown temperature and a cold reservoir at has an efficiency of What is the temperature of the warm reservoir?

A) 1.98 K
B) 0.180 K
C) 157 K
D) 0.160 K


A

Physics & Space Science

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Based on our current understanding of physics, we can understand the conditions that prevailed in the early universe as far back in time as about

A) 380,000 years after the Big Bang. B) one ten-billionth of a second after the Big Bang. C) 10-45 seconds after the Big Bang. D) 10 billion years ago.

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Two identical spheres each carry a charge of ?82.0 µC. The spheres are separated by a distance of 2.00 m. What is the electric force between the spheres? (ke = 8.99 × 10^9 N·m2/C2)

a. 0.184 N (repulsive) b. 15.1 N (repulsive) c. 30.2 N (attractive) d. 1.47 N (attractive) e. 37.8 N (attractive)

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A conducting bar of length L rotates with a constant angular speed of +2.0 rad/s about a pivot P at one end, as shown. A uniform magnetic field (magnitude = 0.20 T) is directed into the paper. If L = 0.40 m, what is the potential difference, VA ? VP?



a.
?12 mV

b.
+8.0 mV

c.
?8.0 mV

d.
+12 mV

e.
?16 mV

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What is the connection between an ENSO and the Peruvian anchovy catch? Explain

What will be an ideal response?

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