A supernova that occurs 10,000 years from now in a galaxy 50,000 light years away:
A) will be observed on Earth 10,000 years from now.
B) was observed on Earth 40,000 years ago.
C) will be observed on Earth 40,000 years from now.
D) was observed on Earth 50,000 years ago.
E) will be observed on Earth 50,0000 years from now.
C
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The ____________________ period of the moon is the time required for one revolution of the moon around Earth with respect to the stars
Fill in the blank(s) with correct word
A 50-g cube of ice, initially at 0.0°C, is dropped into 200 g of water in an 80-g aluminum container, both initially at 40°C. What is the final equilibrium temperature? (Specific heat for aluminum is 900 J/kg•°C, the specific heat of water is 4186 J/kg•°C, and Lf = 3.33 × 10^5 J/kg.)
a. 17.6°C c. 12.1°C b. 9.5°C d. 20.6°C
Every equation in physics reminds us of a lesson: we can never change only one thing. When we change the composition of the atmosphere we likely also change
A) its transparency. B) its reflectivity. C) its average temperature. D) Earth's climate. E) all of the above
A proton moving at 3.0 × 10^4 m/s is projected at an angle of 30° above a horizontal plane. If an electric field of 400 N/C is acting down, how long does it take the proton to return to the horizontal plane? (Hint: Ignore gravity. mproton = 1.67 × 10^?27 kg, qproton = 1.6 × 10^?19 C)
a. 7.8 × 10^?7 s b. 1.7 × 10^?6 s c. 3.9 × 10^?6 s d. 7.8 × 10^?6 s