In a certain cyclotron, a proton of mass 1.67 × 10-27 kg moves in a circle of diameter 1.6 m with an angular speed of 2.0 × 106 rad/s. What is the angular momentum of the proton?
A) 1.3 × 10-21 kg ? m2/s
B) 1.8 × 10-21 kg ? m2/s
C) 2.1 × 10-21 kg ? m2/s
D) 3.2 × 10-21 kg ? m2/s
C
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Europa has few craters because
a. it is protected from impacts by Jupiter's gravity. b. it does not have a solid surface. c. it has erased craters nearly as fast as they have formed. d. its surface is not strong enough to support craters. e. it keeps one face always pointed toward Jupiter which screens it from incoming meteorites.
The Gateway Arch in St. Louis is approximately 193 meters tall. What is its height in feet?
A) 58.8 feet B) 64.3 feet C) 633 feet D) 759 feet E) 7,590 feet
Eratosthenes' measurements of Earth's size involved
A) a deep well in Syene. B) a pillar's shadow in Alexandria. C) surveying the distance between Alexandria and Syene. D) all of the above
The average density of blood is 1.06 × 103 kg/ m3. If you donate a pint of blood to the Red Cross, what mass of blood have you donated, in grams? (1 pt = 1/2 L, 1 L = 1000 cm3)
A) 530 g B) 0.530 g C) 5.30 × 103 g D) 5.30 × 105 g E) 5.30 g