A proton moving at 3 × 10^4 m/s is projected at an angle of 30° above a horizontal plane. If an electric field of 400 N/C is directed downwards, 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.]
7.8 × 10^?7 s
Physics & Space Science
You might also like to view...
Which of the following black holes has the largest event horizon? (Ignore any effects of rotation.)
A) a 5 solar mass black hole B) a 10 solar mass black hole C) All black holes have the same size event horizon.
Physics & Space Science
What is the hour angle of a star crossing your meridian?
A) -6 hours B) 0 hours C) 6 hours D) It depends on your latitude. E) It depends on the right ascension of the star.
Physics & Space Science
At greater distances from the sun, planetary surface temperatures increase
Indicate whether the statement is true or false
Physics & Space Science
At the time of a full moon, an astronaut on the Moon looking at Earth would see a
a. full Earth moon. b. first-quarter Earth moon. c. last-quarter Earth moon. d. new Earth moon.
Physics & Space Science