A rope with a total mass of 25.0 kg is tied to a tree on one side of a 125-m wide ravine. You are pulling on the other end of the rope with a force of 415 N
If you pluck the rope at your end, how long will it take the pulse to travel across the ravine to the tree?
2.74 s
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How many atoms are in one gram of 27 13 Al?
a. 
b. 
c. 
d. 
e. 
If Q = 400 ?C and the potential difference VA ? VB = ?10 V in the circuit segment shown below, what is the current in the resistor?
a.
1.0 mA right to left
b.
1.0 mA left to right
c.
3.5 mA right to left
d.
3.5 mA left to right
e.
None of the above
Which of the following is true about the rotation of the Moon?
What will be an ideal response?
An electron is in an infinite square well (a box) that is 8.9 nm wide. What is the ground state energy of the electron? (h = 6.626 × 10-34 J ? s, mel = 9.11 × 10-31 kg, 1 eV = 1.60 × 10-19)
A) 0.0048 eV B) 0.0057 eV C) 0.0066 eV D) 0.0076 eV E) 0.0085 eV