A thermometer is made such that the freezing point of water is defined to be 60.0°H and the boiling point of water at sea level is defined to be 520°H. What is the Celsius temperature at 240°H?
A)
-13.8°C
B)
34.6°C
C)
31.0°C
D)
-7.8°C
E)
39.1°C
E
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In the Bohr model of the hydrogen atom
a. energy is quantized b. the electron's angular momentum is quantized c. the emission spectrum is quantized d. the absorption spectrum is quantized. e. all of the above
Our best measurements from Earth indicate that the star system Alpha Centauri is 4.2 light-years away. Suppose some of our astronauts traveled there at a speed v = 0.90c. What would the astronauts measure as the distance to Alpha Centauri?
a. 1.3 lightyears c. 1.8 lightyears b. 4.0 lightyears d. 2.7 lightyears
An electron is moving at 
m/s at an angle of 40 
to a 0.80 T magnetic field. What is the magnitude of the force on the electron?
A. 
B. 
C. 
D. 
E. 
A horizontal uniform meter stick supported at the 50-cm mark has a mass of 0.50 kg hanging from it at the 20-cm mark and a 0.30-kg mass hanging from it at the 60-cm mark. Determine the position on the meter stick at which one would hang a third mass of 0.60 kg to keep the meter stick balanced
a. 74 cm b. 70 cm c. 65 cm d. 86 cm e. 62 cm