Why is it easier to find an iron meteorite on the ground that it is to witness one fall?
What will be an ideal response?
Iron meteorites make up 66 percent of finds but only 6 percent of falls. One of the best places to look for meteorites is in parts of Antarctica because Earth rocks are buried deep beneath the ice cap. Antarctic ice sheets flow outward and meteorites concentrate in areas where the ice runs into mountain barriers and evaporates. Teams of scientists have found a thousand meteorites in a single two-month expedition, and over 40,000 after 25 years of work.
Why iron meteorites? Because an iron meteorite doesn't look like an ordinary rock, they are recognizably different. Stony meteorites deteriorate rapidly when exposed to weather; irons are made of stronger material and generally survive longer, therefore easier to spot on the ground. The fact that only 6 percent of falls are irons shows that iron meteoroids, although easier to find on Earth, are relatively rare in space.
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A board of mass m lies on the ground. What is the magnitude of the force you would have to exert to lift one end of the board barely off the ground (assuming that the other end still touches the ground)?
A. 
B. 
C. 
D. The answer depends on the board’s length.
E. Other (explain)
Two Mercury years are the same length as three Mercury sidereal days
Indicate whether the statement is true or false
Samantha pushes a 60-N crate up a ramp 30 m in length and inclined at 10° with the horizontal. What potential energy change does the crate experience?
a. 1.8E+3 J b. 1.8E+3 J c. 1.2E+1 J d. 3.1E+2 J e. 1.0E+4 J
An enclosed chamber with sound absorbing walls has a 2.0 m × 1.0 m opening for an outside window. A loudspeaker is located outdoors,, 78 m away and facing the window
The intensity level of the sound entering the window space from the loudspeaker is 79 dB. Assume the acoustic output of the loudspeaker is uniform in all directions and that the acoustic energy incident upon the ground is completely absorbed and therefore is not reflected into the window. The threshold of hearing is 1.0 × 10-12 W/m2. The acoustic power entering through the window space is closest to A) 160 µW. B) 79 µW. C) 320 µW. D) 790 µW. E) 1600 µW.