What does escape velocity measure?
A. how fast an object needs to go to escape hostile space aliens
B. how fast an object needs to go to escape a planet's gravity
C. how far away an object needs to be to escape a planet's gravity
D. the gravitational attraction at a planet's surface
Answer: B
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An electron a distance d from a proton feels an electrostatic force of magnitude 
. Imagine that we move the electron so that it is a distance 2d from a helium nucleus (which has two protons and two neutrons). The magnitude of the force on the electron now is b , where b is
A. 4 B. 2 C. 1 D. 1/2 E. 1/4
A small glass bead has been charged to 1.9 nC. What is the strength of the electric field 2.0 cm from the center of the bead? (k = 1/4??0 = 8.99 × 109 N ? m2/C2 )
A) 4.3 × 104 N/C B) 8.5 × 102 N/C C) 8.1 × 10-5 N/C D) 8.5 × 10-7 N/C
Two extremely flat glass plates, 10.0 cm wide, touch at one end but are separated by a thin wire at the other end, forming a wedge
Light with a wavelength of 450 nm shines almost perpendicularly on the glass and forms fringes which are 1.80 mm apart. What is the diameter of the wire? A) 25.0 µm B) 10.0 µm C) 20.0 µm D) 12.5 µm E) 17.5 µm
A capacitor in a single-loop RC circuit is charged to 85% of its final potential difference in 2.4 s. What is the time constant for this circuit?
a. 1.5 s b. 1.3 s c. 1.7 s d. 1.9 s e. 2.9 s