A 50.0-g sample of a material at 80.0°C is dropped into a calorimeter containing 100.0 g of water at 20.0°C. When the mixture reaches thermal equilibrium, it is at a temperature 24.0°C
If heat transfer to the walls of the calorimeter is negligible, what is the specific heat of the material?
A)
0.143 cal/(g?C°)
B)
0.322 cal/(g?C°)
C)
0.221 cal/(g?C°)
D)
0.437 cal/(g?C°)
E)
0.0714 cal/(g?C°)
A
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Jupiter does not have
a. a hot interior. b. convection occurring in its atmosphere. c. crustal plates on its surface. d. a dynamo effect. e. any rings.
A charge of 25 nC is uniformly distributed along a circular arc (radius = 2.0 m) that is subtended by a 90-degree angle. What is the magnitude of the electric field at the center of the circle along which the arc lies?
A. 81 N/C B. 61 N/C C. 71 N/C D. 51 N/C E. 25 N/C
Light from a He-Ne laser of wavelength 633 nm passes through a circular aperture. The resulting pattern is observed on a screen 4.0 m behind the aperture, where the width of the central bright circle is 1.1 cm. What is the diameter of the hole?
A) 4700 ?m B) 32,000 ?m C) 9.8 ?m D) 560 ?m
The energy level diagram for hydrogen
The ionization energy of hydrogen is
a.
1.5 eV.
b.
1.9 eV.
c.
3.4 eV.
d.
10.2 eV.
e.
13.6 eV.