Which element would not have been found in Earth's early atmosphere? What is the most abundant gas found in Earth's atmosphere today?
a. nitrogen (N2)
b. carbon dioxide (CO2)
c. helium (He)
d. hydrogen (H)
e. oxygen (O2)
a
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Consider a pipe of length L that is open at both ends. What are the wavelengths of the three lowest-pitch tones produced by this pipe?
A) 4L, 2L, L B) 2L, L, L/2 C) 2L, L, 2L/3 D) 4L, 4L/3, 4L/5 E) 4L, 2L, L/2
Two slits are illuminated with red light (l = 650 nm). The slits are 0.25 mm apart and the distance to the screen is 1.25 m. What fraction of the maximum intensity on the screen is the intensity measured at a distance 3.0 mm from the central maximum?
a. 0.94 b. 0.92 c. 0.96 d. 0.98 e. 0.99
At what speed are lengths contracted to half and times dilated by a factor of 2?
What will be an ideal response?
A 1.7 kg model airplane is flying north at 12.5 m/s initially - and 25 seconds later is observed heading 30 degrees west of north at 25 m/s. What is the magnitude of the average net force on the airplane during this time interval?
A. 0.85 N B. 0.63 N C. 1.1 N D. 1.5 N