Sirius A and Sirius B constitute a binary star pair in which the stars orbit their common center of mass with a period of 49.9 years. The stars are 2.40 × 1012 m apart
Assume that the two stars have equal masses and that they move in a circle about their common center of mass. What is the mass of each star? G = 6.67 x 10-11 N•m2/kg2. A) 5.41 × 1030 kg
B) 2.70 × 1030 kg
C) 7.55 × 1030 kg
D) 3.30 × 1030 kg
E) 1.65 × 1030 kg
E
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A boy on a bicycle approaches a brick wall as he sounds his horn at a frequency 400.00 Hz
The sound he hears reflected back from the wall is at a frequency 408.00 Hz. At what is the speed is the boy riding his bicycle toward the wall? Assume the speed of sound in air is 340 m/s. A) 3.68 m/s B) 333 m/s C) 6.67 m/s D) 6.80 m/s E) 3.37 m/s
What happens to its moment of inertia when a steel disk is heated?
a. It increases. b. It decreases. c. It stays the same. d. It increases for half the temperature increase and then decreases for the rest of the temperature increase.
There is no current in the circuit shown in the figure below until the switch is closed. The current through the 20-? resistor the instant after the switch is closed is either [1] 15 A or [2] 5.0 A, and the current through the 20-? resistor after the switch has been closed a long time is either [3] 5.0 A or [4] 15 A. Which combination of the above choices is correct?
a.
[1] and [3]
b.
[1] and [4]
c.
[2] and [3]
d.
[2] and [4]
e.
None of these
A small dense object is suspended from the rear view mirror in a car by a lightweight fiber. As the car is accelerating at 1.90 m/s2, what angle does the string make with the vertical?