The radius of the n = 3 Bohr orbit in the hydrogen atom is

A)

0.36 nm.
B)

0.60 nm.
C)

0.48 nm.
D)

0.12 nm.
E)

0.24 nm.


C

Physics & Space Science

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If Q = 20 ?C and L = 60 cm, what is the magnitude of the electrostatic force on any one of the charges shown?



a.
25 N

b.
19 N

c.
15 N

d.
9.1 N

e.
14 N

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Define an inelastic collision in terms of conservation of momentum and energy

What will be an ideal response?

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Consider a situation where you carry a 20-N box up a flight of stairs, raising its elevation by 5 m.You drop the box. As it falls to its original level, its kinetic energy is

a. 0 b. 4 J. c. 100 J. d. none of the above.

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The mass of an object is fixed, but its weight varies from location to location

Indicate whether the statement is true or false

Physics & Space Science