In which city is Polaris highest in the sky?
A) Singapore
B) Mexico City
C) Denver
D) Anchorage
E) All the same, depending on the time of night
Answer: D
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A charged particle of enters a region of magnetic field at a speed of 
at an angle of 37 degrees relative to the magnetic field direction. If the magnetic field strength is 1.2 T and the charge of the particle is +e, and the radius of the helical path is 8.9 cm, what is the particle’s mass?
a. 
b. 
c. insufficient information given.
d. 
A fisherman fishing from a pier observes that the float on his line bobs up and down, taking 2.4 s to move from its highest point to its lowest point. He also estimates that the distance between adjacent wave crests is 48 m
What is the speed of the waves going past the pier? A) 1.0 m/s B) 20 m/s C) 10 m/s D) 5.0 m/s E) 120 m/s
Which of the following describes volcanism?
A) the excavation of bowl-shaped depressions by asteroids or comets striking a planet's surface B) the eruption of molten rock from a planet's interior to its surface C) the disruption of a planet's surface by internal stresses D) the wearing down or building up of geological features by wind, water, ice, and other phenomena of planetary weather
Calculate: (a) time elapsed in cooling the surface of the sphere to 204°C and (b) time elapsed in cooling the center of the sphere to 204°C.
A steel sphere with a diameter of 7.6 cm is to be hardened by first heating it to a uniform
temperature of 870°C and then quenching it in a large bath of water at a temperature of 38°C.
The following data apply
GIVEN
FIND
(a) Time elapsed in cooling the surface of the sphere to 204°C
(b) Time elapsed in cooling the center of the sphere to 204°C
ASSUMPTIONS
Constant water bath temperature, thermal properties, and transfer coefficient
SKETCH
