A 30 cm long organ pipe is filled with air and is open at one end and closed at the other. The velocity of sound in air at 0
is 331 m/s. What is the wavelength of the second mode?
A. 10 cm
B. 20 cm
C. 30 cm
D. 40 cm
E. 60 cm
D. 40 cm
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Earth's axis is tilted ______________ degrees from the normal to the ecliptic plane
a. zero b. 90 c. 45 d. 23.5
Conduction: A heat-conducting rod that is wrapped in insulation is constructed with a 0.15-m length of alloy A and a 0.40-m length of alloy B, joined end-to-end. Both pieces have cross-sectional areas of 0.0020 m2. The thermal conductivity of alloy B is known to be 1.8 times as great as that for alloy A. The end of the rod in alloy A is maintained at a temperature of 10°C, and the other end of the rod is maintained at an unknown temperature. When steady state flow has been established, the temperature at the junction of the alloys is measured to be 40°C, and the rate of heat flow in the rod is measured at 56 W. What is the thermal conductivity of alloy A?
A. 120 W/m ? K B. 125 W/m ? K C. 130 W/m ? K D. 135 W/m ? K E. 140 W/m ? K
If you had something the size of a sugar cube that was made of white dwarf matter, it would weigh ________
A) as much as a truck B) as much as an average person C) about 5 pounds D) as much as the entire Earth
In addition to the asteroid belt, some meteorites come from the Moon and even Mars
Indicate whether the statement is true or false