In a mass spectrometer, a single-charged particle has a speed of 1.00 × 106 m/s and enters a uniform magnetic field of 0.200 T at a right angle to the field. The radius of the resulting circular orbit is 20.75 cm
What is the mass of the particle? (e = 1.60 × 10-19 C)
A) 6.64 × 10-27 kg B) 3.20 × 10-27 kg C) 1.67 × 10-27 kg D) 9.11 × 10-31 kg
A
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The quark epoch is when ________ was/were created
A) all known matter B) everything in normal atoms C) only dark energy D) protons and neutrons that still survive E) the rapid inflation of the cosmos
The moderate temperatures of islands throughout the world has mainly to do with water's
A) poor conductivity. B) vast supply of thermal energy. C) high specific heat capacity. D) high evaporation rate. E) absorption of solar energy.
On a photograph of the Moon, the Moon measures 30 cm in diameter and a small crater measures 0.2 cm. The Moon's physical diameter is 1738 km. What is the physical diameter of the small crater?
a. about 1738 km b. about 12 km c. about 520 km d. about 350 km e. about 3.5 km
An asteroid, of radius 2.1 km, is observed to have an escape speed equal to a typical person’s speed attained by jumping off, 3.0 m/s. What is its mass?
a. 
b. 
c. 
d. 
e. 