Circular Motion of Charges: A proton, moving in a uniform magnetic field, moves in a circle perpendicular to the field lines and takes time T for each circle. If the proton's speed tripled, what would now be its time to go around each circle?
A. 9T
B. 3T
C. T
D. T/3
E. T/9
Answer: C
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The first-quarter moon is at its highest point at about 6 P.M.
Answer the following statement true (T) or false (F)
X-ray bursters occur in binary star systems. The two types of stars that must be present to make up such an object are:
A) a white dwarf and a neutron star. B) a contact binary system of two red giants. C) a white dwarf and a main sequence star. D) a main sequence or giant star and a neutron star in a mass transfer binary. E) two neutron stars in a mass transfer binary.
Estimate the depth in moist soil at which the annual temperature variation will be 10% of that at the surface.
GIVEN
Moist soil
FIND
The depth in moist soil at which the annual temperature variation will be 10 per cent of that at the surface
ASSUMPTIONS
Conduction is one dimensional
The soil has uniform and constant properties
Annual temperature variation can be treated as a step change in surface temperature with a 6 month
response time
SKETCH
What is the average translational kinetic energy per molecule of an ideal gas at a temperature of ? The Boltzmann constant is 1.38 × 10-23 J/K
A) 1.7 × 10-21 J B) 8.3 × 10-21 J C) 6.2 × 10-21 J D) 2.1 × 10-21 J E) 4.1 × 10-21 J