You are removing a pie from a 350°F oven, and while you need to protect your hands from the pie pan, the backs of your hands and your wrists and forearms are unprotected, yet they don't get burned. Why?
What will be an ideal response?
Your body is largely water, which has a much higher heat capacity than air, thus the contact with the hot air causes only a small temperature change in your body.
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An organ pipe open at both ends is 1.5 m long. A second organ pipe that is closed at one end and open at the other is 0.75 m long. The speed of sound in the room is 330 m/s. Which of the following sets of frequencies consists of frequencies which can be produced by both pipes?
a. 110 Hz, 220 Hz, 330 Hz b. 220 Hz, 440 Hz, 660 Hz c. 110 Hz, 330 Hz, 550 Hz d. 330 Hz, 440 Hz, 550 Hz e. 220 Hz, 660 Hz, 1 100 Hz
As you go higher and higher above the surface of the earth, the acceleration of a freely falling body __________
Fill in the blank(s) with correct word
What makes direct imaging of exoplanets possible?
A. Exoplanets are very dim compared to their host star. B. Exoplanets emit their own light in visible wavelengths, where the host star is dimmer. C. Exoplanets reflect light directly toward their host star. D. Exoplanets emit their own light in the infrared, where the host star is dimmer. E. None of these choices are correct.
If an electron is accelerated from rest through a potential difference of 9.9 kV, what is its resulting speed? (e = 1.60 × 10-19 C, k = 1/4??0 = 8.99 × 109 N ? m2/C2, mel = 9.11 x 10-31 kg)
A) 5.9 × 107 m/s B) 4.9 × 107 m/s C) 3.9 × 107 m/s D) 2.9 × 107 m/s