Significant Figures: In the sum A + B + C, A is accurate to 5 decimal places, B is accurate to 2 decimal places, and C is accurate to 3 decimal places. What is the correct number of decimal places in the sum?
A. 2
B. 3
C. 4
D. 5
E. 10
Answer: A
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Gravitational Force: Two identical tiny balls of highly compressed matter are 1.50 m apart. When released in an orbiting space station, they accelerate toward each other at 2.00 cm/s2. What is the mass of each of them? (G = 6.67 × 10-11 N ? m2/kg2)
Fill in the blank(s) with the appropriate word(s).
The force needed to make an object move in a circle is
a. centripetal force. b. weight. c. kinetic friction. d. static friction. e. none of the above.
Standing Waves on a String: A guitar string 0.65 m long has a tension of 61 N and a mass per unit length of 3.0 g/m.(a) What is the speed of waves on the string when it is plucked?(b) What is the string's fundamental frequency of vibration when plucked?(c) At what other frequencies will this string vibrate?
What will be an ideal response?
The point along a planet's orbit where it is closest to the Sun is called the orbit's
A) period. B) perihelion. C) eccentricity. D) semi-major axis. E) aphelion.