How are right ascension in the sky and longitude on Earth different?
What will be an ideal response?
Right ascension is measured in units of time eastward from the vernal equinox, while longitude is measured in degrees east or west of the Greenwich meridian.
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Silver has a Fermi level of 5.5 eV. At 0 K, what is the speed of the electrons with the Fermi speed?
A) 1.4 × 106 m/s B) 1100 m/s C) 2200 m/s D) 0 E) 1.1 × 106 m/s
Which exoplanet detection method requires us to be in the same plane as the exoplanetary system?
A. Direct imaging B. Transit method C. Radial-velocity method D. Gravitational lensing E. None of these choices are correct.
A circular cylinder of height 1.20 m having faces of diameter 0.620 m is immersed in water of density 1.00 × 10^3 kg/m3 with its axis vertical so that its faces are parallel to the surface of the water. The upper face is 2.50 m below the surface of the water. The net force on this cylinder is observed to be 1120 N downward. Atmospheric pressure is 1.01 × 10^5 Pa. What is the weight of the cylinder?
A) 7.40 × 10^3 N B) 1.09 × 10^4 N C) 3.79 × 10^4 N D) 4.14 × 10^4 N E) 1.37 × 10^5 N
Two 0.95-kg masses, one aluminum and one tin, both at 80.0°C, are placed in 1.00 kg of water at 20.0°C. What is the equilibrium temperature of the system? The specific heats of aluminum and tin are 900 J/kg/°C and 227 J/kg/°C, respectively
a. 32.2 °C b. 27.1 °C c. 13.2 °C d. 40.3 °C