Two instruments produce a beat frequency of 5 Hz. If one has a frequency of 264 Hz, what could be the frequency of the other instrument?
a. 269 Hz
b. 254 Hz
c. 264 Hz
d. 5 Hz
e. 274 Hz
a
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Shown following are six different types of light that travel to Earth from sources in space. Rank these types of light from left to right based on the altitude in the atmosphere where they are completely absorbed, from highest to lowest (Earth’s surface). If two (or more) of the choices reach the same altitude or the surface, rank them as equal by dragging one on top of the other(s).
Compared to Ida, Eros, and Gaspra, what was odd about Mathilde?
A) It had a small moon, so we could more accurately find its mass. B) It was much denser, probably made of iron and nickel, a class M asteroid. C) It was less dense than water, indicating it was a comet nucleus, rather than an asteroid. D) It was less dense than rock, but more than ice, suggesting a porous structure. E) It was the same density as the Earth's Moon, indicating it had been knocked off our Moon.
The oldest intact rocks found on Earth date back to approximately
A) 4.57 billion years ago B) 3.85 billion years ago C) 4.38 billion years ago D) 4.02 billion years ago
When a capacitor has a charge of magnitude 80 mC on each plate the potential difference across the plates is 16 V. How much energy is stored in this capacitor when the potential difference across its plates is 42 V?
a. 1.0 mJ b. 4.4 mJ c. 3.2 mJ d. 1.4 mJ e. 1.7 mJ