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

Physics & Space Science

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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

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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

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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

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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

Physics & Space Science