What is true about Antares?
A: name means "Rival of Mars"
B: ˜700 times the size of the Sun
C: possibly egg-shaped
D: cooler than the Sun
E: all of the above
Answer: E: all of the above
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Our Sun will end its life in a planetary nebula and become a white dwarf
Indicate whether the statement is true or false
A 3.0-kg brick rests on a perfectly smooth ramp inclined at 34° above the horizontal. The brick is kept from sliding down the plane by an ideal spring that is aligned with the surface and attached to a wall above the brick
The spring has a spring constant (force constant) of 120 N/m. By how much does the spring stretch with the brick attached? A) 36 cm B) 360 cm C) 24 cm D) 14 cm E) 240 cm
A 1.15-kg grinding wheel 22.0 cm in diameter is spinning counterclockwise at a rate of 20.0 revolutions per second
When the power to the grinder is turned off, the grinding wheel slows with constant angular acceleration and takes 80.0 s to come to a rest. (a) What was the angular acceleration (in rad/s2 ) of the grinding wheel as it came to rest if we take a counterclockwise rotation as positive? (b) How many revolutions did the wheel make during the time it was coming to rest?
X-rays with an energy of 400 keV undergo Compton scattering from a target. The scattered rays are deflected at an angle of 38° relative to the direction of the incident rays.What is the energy of the scattered x-rays?
a. 343 keV b. 300 keV c. 400 keV d. 2410 keV