Conservation of ____________ is observed in strong and electromagnetic interactions but not in weak interactions
a. baryon number
b. lepton number
c. strangeness
d. charm
e. beauty
C
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The accurate determination of star distances by the method of standard candles requires accurate knowledge of the ________ of the standard candle.
A. temperature B. luminosity C. size D. speed
A uniform ball with diameter of 10 cm rolls without slipping on a horizontal tabletop. The moment of inertia of the ball about an axis through its center is 2.2 × 10-3 kg ? m2,
and the translational speed of its center is 0.45 m/s. (a) What is its angular speed of the ball about its center of mass? (b) What is the rotational kinetic energy of the ball? (c) What is the ball's angular momentum about its center of mass?
If we observe one edge of a planet to be redshifted and the opposite edge to be blueshifted, what can we conclude about the planet?
A) The planet is actually two bodies, one moving toward us, the other away from us. B) The planet is in the process of formation. C) The planet is in the process of falling apart. D) The planet is rotating.
How much work must be done to accelerate a particle of mass 2.1 × 10-14 kg from a speed of 1.5 × 108 m/s to a speed of 2.5 × 108 m/s? (c = 3.00 × 108 m/s)
What will be an ideal response?