Two forces act on a 55-kg object. One force has magnitude 65 N directed 59° clockwise from the positive x-axis, and the other has a magnitude 35 N at 32° clockwise from the positive y-axis. What is the magnitude of this object's acceleration?
A) 1.1 m/s2
B) 1.3 m/s2
C) 1.5 m/s2
D) 1.7 m/s2
A
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Which of the following results shows the validity of the relativistic effect of time dilation?
A) the detection of gravity waves B) bending of light near the Sun C) the decay of muons D) red shift in distant galaxies E) blue shift in distant galaxies
If it takes 50 photons per 0.1 s entering the eye so that the brain senses the light, which of the following colors of light would be delivering the most power to the eye at this minimum perception level?
a. red c. blue b. violet d. All would be delivering the same power.
The radioactivity due to carbon-14 measured in a piece of a wooden casket from an ancient burial site is found to produce 20 counts per minute from a given sample,
whereas the same amount of carbon from a piece of living wood produces 160 counts per minute. The half-life of carbon-14, a beta-minus emitter, is 5730 years. What would we calculate for the age of the artifact, assuming that the activity for living wood has remained constant over time? A) 5,700 years B) 11,500 years C) 14,800 years D) 17,200 years E) 23,000 years
The halo stars in our Galaxy are bright, upper-main-sequence stars
Indicate whether the statement is true or false