Charge of uniform density 4.0 nC/m is distributed along the x axis from x = ?2.0 m to x = +3.0 m. What is the magnitude of the electric field at the point x = +5.0 m on the x axis?
a. 16 N/C
b. 13 N/C
c. 19 N/C
d. 26 N/C
e. 5.0 N/C
b
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A solid, uniform sphere of mass 2.0 kg and radius 1.7 m rolls from rest without slipping down an inclined plane of height 7.0 m. What is the angular velocity of the sphere at the bottom of the inclined plane?
A) 5.8 rad/s B) 9.9 rad/s C) 11 rad/s D) 7.0 rad/s
If the distance between us and a star is doubled, with everything else remaining the same, the luminosity
A) is decreased by a factor of four, and the apparent brightness is decreased by a factor of four. B) is decreased by a factor of two, and the apparent brightness is decreased by a factor of two. C) remains the same, but the apparent brightness is decreased by a factor of two. D) remains the same, but the apparent brightness is decreased by a factor of four. E) is decreased by a factor of four, but the apparent brightness remains the same.
A proton (m = 1.7 × 10^-27 kg, q = +1.6 × 10^-19 C) starts from rest at point A and has a speed of 40 km/s at point B. Only electric forces act on it during this motion. Determine the electric potential difference VB - VA
a. +8.5 V b. -8.5 V c. -4.8 V d. +4.8 V e. -17 V
Simple pendulum A swings back and forth at twice the frequency of simple pendulum B. Which statement is correct?
A) Pendulum B is twice as long as A. B) Pendulum B is twice as massive as A. C) The length of B is times the length of A. D) The mass of B is times the mass of A. E) The length of A is times the length of B.