The density of material at the center of a neutron star is approximately 1.00 × 1018 kg/m3. What is the mass of a cube of this material that is on each side. (One micron is equal to 1.00 × 10-6 m.)
A) 5.45 kg
B) 4.74 kg
C) 6.16 kg
D) 6.70 kg
A
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A skater spins with a roatation of 3 cycles per second. If she draws in her arms so that rotational inertia is reduced to 80% of her former amount, what will be her spin rate?
An electron inside a hydrogen atom is confined to within a space of about 0.110 nm. If the electron mass is 9.11 x 10-31 kg, what is the uncertainty in the electron's velocity?
A) 1.05 × 106 m/s B) 1.50 × 106 m/s C) 1.05 × 108 m/s D) 1.50 × 108 m/s E) 1.05 × 1010 m/s
One gram of water is heated from 0°C to 100°C at a constant pressure of 1 atm. Determine the approximate change in internal energy (in cal) of the water.
A. 160 B. 130 C. 100 D. 180 E. 50
The colors of objects we see by reflected light are due to
a. interference. b. selective absorption. c. specular reflection. d. diffuse reflection.