A typical "shooting star" during a meteor shower is caused by a ________ entering Earth's atmosphere.
A) boulder-size particle from an asteroid
B) boulder-size particle from a comet
C) pebble-size particle from an asteroid
D) pebble-size particle from a comet
E) microscopic particle of interstellar dust
D) pebble-size particle from a comet
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Two spheres are made of conducting material. Sphere #2 has twice the radius of Sphere #1 . What is the ratio of the capacitance of Sphere #2 to the capacitance of sphere #1?
a. 1, since all conducting spheres have the same capacitance. b. 2 c. 4 d. 8 e. A single sphere has no capacitance since a second concentric spherical shell is necessary to make a spherical capacitor. Thus, none of the answers above is correct.
A skater is using very low-friction rollerblades. A friend throws a Frisbee at her, on the straight line along which she is coasting. Describe the following event as an elastic, an inelastic, or a perfectly inelastic collision between the skater and the Frisbee. She catches the Frisbee and holds it
1.elastic 2.inelastic 3.perfectly inelastic
The thermoplastic polymer with the highest melting point is _________.
Fill in the blank(s) with the appropriate word(s).
In an x-ray diffraction experiment, using x-rays of wavelength ? = 0.434 × 10^?10 m, a first-order maximum occurred at 8° off the crystal plane. Find the distance d between crystal planes
a. 1.56E–10 m b. 2.19E–11 m c. 4.88E–10 m d. 1.70E–9 m e. 3.12E–10 m