A car moving at a constant speed goes around a curve of 400 ft radius and then goes around a second curve of 200 ft radius. The centripetal force acting on the car as it goes around the 200 ft radius curve is ___________ the value of the centripetal force acting on the car as it goes around the 400 ft radius curve
a. one quarter
b. one half
c. the same as
d. twice
e. four times
D
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An electron with a charge value of 1.6 × 10^-19 C is moving in the presence of an electric field of 300 N/C. What force does the electron experience?
a. 2.3 × 10^-22 N c. 6.4 × 10^-17 N b. 4.8 × 10^-17 N d. 1.9 × 10^-21 N
If you are measuring the thickness of a strand of human hair, the most appropriate SI unit is the
A) kilometer. B) meter. C) centimeter. D) millimeter. E) micrometer.
The ____________________ of a black hole in a binary system can emit X-rays and allow us to detect the presence of the black hole
Fill in the blank(s) with correct word
The vibrations of the Sun reveal information about:
A) the temperature of the core of the Sun. B) the structure of the atmosphere of the Sun. C) the interior structure of the Sun. D) the production of energy in the Sun. E) the magnetic field of the Sun.