A typical ruby-throated hummingbird is 8 cm long. Express its length in millimeters and micrometers (µm)
A) 80 mm; 800 µm
B) 80 mm; 80,000 µm
C) 800 mm; 0.008 µm
D) 800 mm; 0.8 µm
E) 0.8 mm; 8000 µm
B
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The planetary model of the hydrogen atom consists of an electron in a circular orbit about a proton. The motion of the electron of charge 1.60 × 10?19 C creates an electric current. The radius of the electron orbit is 5.30 × 10?11 m and the electron's velocity is 2.20 × 106 m/s. What is the magnetic field strength at the location of the proton?
What will be an ideal response?
When we look at an object that is 1,000 light-years away, we see it ________
A) as it was 1,000 light-years ago B) looking just the same as our ancestors would have seen it 1,000 years ago C) as it is right now, but it appears 1,000 times dimmer D) as it was 1,000 years ago
Consider a situation where you carry a 20-N box up a flight of stairs, raising its elevation by 5 m.The increase of potential energy of the box is
a. 0 b. 4 J. c. 100 J. d. none of the above.
What is the expression for efficiency () in terms of the work W done by the system and the heat Q added to it?
a. = WQ b. = Q/W c. = Q + W d. = Q + 273K e. = W/Q