A charged particle of mass
kg enters a region of magnetic field at a speed of 
at an angle of 37 degrees relative to the magnetic field direction. If the magnetic field strength is 1.2 T what will be the radius of the helical path it takes?
A. Insufficient information given.
B. 15 cm
C. 8.9 cm.
D. 11 cm
A. Insufficient information given.
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The temperature inside a Carnot refrigerator placed in a kitchen at 22°C is 2.0°C. The heat extracted from refrigerator is 89 MJ/h. What power is needed to operate this refrigerator?
A) 1.7 kW B) 1.8 kW C) 1.5 kW D) 1.9 kW E) 1.6 kW
Why are Cepheid variables important?
A) Cepheid variables are stars that vary in brightness extremely rapidly as they rotate on their axes. B) Cepheid variables are stars that brighten and dim with a period that is directly related to the star's luminosity. C) Cepheids are a type of young galaxy that helps us understand how galaxies form. D) Cepheids are supermassive stars that we observe because they will soon undergo supernovae.
Choose the correct statement explaining what was the Kepler mission?
What will be an ideal response?
Which of the following is true of Population I stars?
A) They are usually found in the halo of our Galaxy. B) They are usually found in globular clusters. C) They are usually found in the central bulge. D) They are usually found in the disk component of the galaxy.