A helium balloon rises because of
a. Archimedes' principle
b. Pascal's principle
c. Bernoulli's principle
d. Torricelli's principle
e. none of these principles
A
You might also like to view...
A 2.0-g string that is 0.67 m long is under tension. The string vibrates at 700 Hz tone in its third harmonic, and this vibration causes a sound wave. What is the wavelength of the sound? The speed of sound in air is 344 m/s
A) 0.49 B) 0.55 C) 0.61 D) 0.67 E) 0.45
A brass wire (d 5 2.0 mm, E 5 110 GPa) is pretensioned to T 5 85 N. The coefficient of thermal expan- sion for the wire is 19.5 3 1026/°C. The temperature change at which the wire goes slack is approximately:
(A) 15.7 °C
(B) 212.6 °C
(C) 112.6 °C
(D) 218.2 °C
The sunspot cycle affects ____________. I. the latitude at which most sunspots occur II. the number of sunspots that are visible. III. the rotation rate of the sun's equator IV. the magnetic polarity of the sunspot pair members in a hemisphere
a. I & II b. I & IV c. II & III d. I, II & III e. I, II, & IV
The most abundant element in the universe is
a. hydrogen. b. iron. c. oxygen. d. carbon.