Coulomb's Law: Three point charges are placed on the x-axis, as follows. A charge of +2.0 ?C is at the origin, a charge of -2.0 ?C is at x = 50 cm, and a charge of +4.0 ?C is at x = 100 cm. What are the magnitude and direction of the electrostatic force on the charge at the origin due to the other two charges? (k = 1/4??0 = 9.0 × 109 N ? m2/C2)
What will be an ideal response?
0.072 N, toward the right
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During the period each year when we see Mars undergoing apparent retrograde motion in our sky, what is really going on in space?
A) Mars is moving around the Sun in the opposite direction from which Earth is moving around the Sun. B) Earth and Mars are getting closer together. C) Earth is catching up with and passing by Mars in their respective orbits. D) Earth and Mars are on opposite sides of the Sun.
When your eye forms an image, the ________ plays a role analogous to the detector in a camera.
A) retina B) lens C) pupil D) optic nerve
All the following statements about Mars are true. Which one might be the cause of a significant loss of atmospheric gas to space?
A) The rock on Mars is probably red because of chemical reactions with oxygen that had been released into the atmosphere through the outgassing of water molecules. B) Mars lost its global magnetic field, leaving the atmosphere vulnerable to the solar wind. C) The axis tilt of Mars is thought to change significantly with time. D) Mars probably once had a much higher density of greenhouse gases in its atmosphere than it does today.
A 16-kg mass is placed on a 25° incline and friction keeps it from sliding. The coefficient of static friction in this case is 0.574 and the coefficient of sliding friction is 0.519 . The mass is given a shove causing it to slide down the incline. Taking down the incline as positive, what is the acceleration of the mass while it is sliding?
a. 0.47 m/s2 b. –0.47 m/s2 c. –0.96 m/s2 d. 0.96 m/s2 e. 14.50 m/s2