If the rock particles in a sedimentary rock are relatively small with well sorted and well rounded grains, we can infer that the sediment grains traveled a
A) short distance.
B) long distance for a long time.
C) long distance in a short time.
D) short distance for a long time.
Answer: B
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A long solenoid (n = 1 500 turns/m) has a cross-sectional area of 0.40 m2 and a current given by I = (4.0 + 3.0t2) A, where t is in seconds. A flat circular coil (N = 300 turns) with a cross-sectional area of 0.15 m2 is inside and coaxial with the solenoid. What is the magnitude of the emf induced in the coil at t = 2.0 s?
a. 2.7 V b. 1.0 V c. 6.8 V d. 0.68 V e. 1.4 V
A star cluster of age 100 million years contains no type O stars
Indicate whether the statement is true or false
The region of the electromagnetic spectrum with wavelengths just greater than those in the infrared region is the ______________ region
a. microwaves b. x-rays c. gamma rays d. radio waves e. ultraviolet
High-energy photons are used to bombard an unknown metal. The strongest peak is found for X-rays with an energy of 66 keV. What is the atomic number of the metal?
A) 80 B) 81 C) 82 D) 83 E) 84