The figure shows the velocity of a particle as it travels along the x-axis. What is the direction of the acceleration at t = 0.5 s?
A) in the +x direction
B) in the -x direction
C) The acceleration is zero.
Answer: B
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Which of the following could not be determined by an observation that uses only spectroscopy?
A) the chemical composition of a distant star B) the speed at which a distant galaxy is moving away from us C) the surface temperature of a distant star D) the rotation rate of a distant star E) the size of a distant galaxy
Specific heat capacity of ice = 2,000 J/kg-°C latent heat of fusion of water = 334,000 J/kg specific heat capacity of water = 4,000 J/kg-°C After the 1 kg block of ice melts, the amount of heat required to raise its temperature to 10°C is 3,340,000 J
a. True b. False Indicate whether the statement is true or false
A beam of light with a frequency range from 3.01 × 1014 Hz to 6.10 × 1014 Hz is incident on a metal surface
If the work function of the metal surface is 2.20 eV, what is the maximum kinetic energy of photoelectrons ejected from this surface? (h = 6.626 × 10-34 J ? s, 1 eV = 1.60 × 10-19 J) A) 0.42 eV B) 0.21 eV C) 0.33 eV D) 0.48 eV E) 0.16 eV
For the following acid-base reaction, identify what is formed in the space marked
HF + KOH ? ???? + H2O A) KF B) H3OF C) KOH2 D) KOH2F E) none of the above