Three identical 50-kg balls are held at the corners of an equilateral triangle, 30 cm on each side. If one of the balls is released,
what is the magnitude of its initial acceleration if the only forces acting on it are the gravitational forces due to the other two masses? (G = 6.67 × 10-11 N ? m2/kg2)
A) 3.7 × 10-8 m/s2
B) 2.5 × 10-8 m/s2
C) 1.9 × 10-8 m/s2
D) 4.2 × 10-8 m/s2
E) 6.4 × 10-8 m/s2
E
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"Annual motion" refers to changes in the positions of stars in the sky as the result of ________.
A. the Sun's orbit around the center of the galaxy B. the motion of the Sun around Earth C. Earth's rotation on its axis D. Earth's motion as it orbits the Sun E. the rotation of the celestial sphere around Earth
A 0.25 kg ideal harmonic oscillator has a total mechanical energy of 4.0 J. If the oscillation amplitude is 20.0 cm, what is the oscillation frequency?
A) 4.5 Hz B) 1.4 Hz C) 2.3 Hz D) 3.2 Hz
A race car circles 10 times around an 8-km track in 20 min. What is its average velocity per lap?
What will be an ideal response?
A methane molecule is
a. flat and polar. b. flat and nonpolar. c. tetrahedral and nonpolar. d. pyramidal and polar.