Of the following systems, which contains the most heat?
a. 100 kg of water at 80°C
b. 250 kg of water at 40°C
c. 600 kg of ice at 0°C
d. Systems do not contain heat.
d
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About when did the extinction of the dinosaurs occur?
A) 3.5 billion years ago B) 2 billion years ago C) 540 million years ago D) 65 million years ago E) less than 1 million years ago
Identical point charges (+30 ?C) are placed at the corners of a rectangle (4.0 m × 6.0 m). How much external energy is required to bring a charge of 55 ?C from infinity to the midpoint of one of the 6.0-m long sides of the rectangle?
a. 22 J b. 16 J c. 13 J d. 19 J e. 8.0 J
An electron is bound in an infinite square-well potential (a box) on the x-axis. The width of the well is L and the well extends from x = 0.00 nm to
In its present state, the normalized wave function of the electron is given by: ?(x) = sin (2?x/L). What is the energy of the electron in this state?(h = 6.626 × 10-34 J ? s, mel = 9.11 × 10-31 kg, 1 eV = 1.60 × 10-19) A) 0.10 eV B) 0.052 eV C) 0.13 eV D) 0.078 eV E) 0.026 eV
A 6.00-kg block is placed on a 30.0° incline and connected to another block on a 36.87° incline. Although the surfaces are frictionless the blocks do not move. What is the mass in kilograms of the block on the 36.87° incline?
?
?
a.
1.80
b.
3.00
c.
4.00
d.
5.00
e.
6.00