One currently-used practical application of antimatter is in
A) positron emission tomography (PET) scans of the brain.
B) a popular breakfast cereal made of antimatter.
C) the discovery of small cracks in metallic machinery such as airplane wings.
D) nuclear magnetic resonance (NMR) medical diagnosis.
E) propulsion of space vehicles.
A
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Two speakers in a stereo emit identical pure tones. As you move around in front of the speakers, you hear the sound alternating between loud and zero. This occurs because of __________
Fill in the blank(s) with correct word
The Moon does not crash into Earth because
A) Earth's gravitational field is relatively weak at the Moon. B) gravitational pull of other planets keeps the Moon up. C) Moon has a sufficient tangential speed. D) Moon has less mass than Earth. E) none of the above
A 60-?C charge is held fixed at the origin and a ?20-?C charge is held fixed on the x axis at a point x = 1.0 m. If a 10-?C charge is released from rest at a point x = 40 cm, what is its kinetic energy the instant it passes the point x = 70 cm?
a. 9.8 J b. 7.8 J c. 8.8 J d. 6.9 J e. 2.8 J
Three 2.50-?C charges are placed on tiny conducting spheres at the ends of 1.00 m-long strings that are connected at 120° angles as shown below. The magnitude, in N, of the force on the knot at the center is
?
?
A. 0. B. 3.75 × 10?2. C. 5.63 × 10?2. D. 6.50 × 10?2. E. 7.50 × 10?2.