When an apple that weighs 1 N is held at rest above your head, the net force on the apple is
A) 0 N.
B) 0.1 N.
C) 1 N.
D) 10 N.
E) none of the above
Answer: A
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When the equation Sb2S3 + HCl ? SbCl3 + H2S is balanced, the total of all the coefficients (both written and "understood") is
a. 10. b. 14. c. 9. d. 12.
Conversion of Units: A jogger has a mass of 50 kg. Express her mass in grams and micrograms (µg).
A. 50,000 g; 5 × 106 µg B. 500,000 g; 500 × 106 µg C. 500,000 g; 5000 µg D. 50,000 g; 5 × 1010 µg E. 50,000 g; 50,000 µg
A very light ideal spring having a spring constant (force constant) of 8.2 N/cm is used to lift a 2.2-kg tool with an upward acceleration of 3.25 m/s2
If the spring has negligible length when it us not stretched, how long is it while it is pulling the tool upward?
A meson is a subatomic “particle” consisting of a quark–antiquark pair. Suppose we have a meson consisting of an up quark and a much more massive bottom antiquark. The interaction between these point-like quarks is purely attractive, like that between oppositely charged particles. Which of the idealized models in this chapter might best describe this system’s possible energy values?
A. The quanton in a box model B. The Bohr model C. The simple harmonic oscillator model