Approximately how many pennies would you have to stack to reach an average 8-foot ceiling?
A) 2 × 103
B) 2 × 102
C) 2 × 104
D) 2 × 105
E) 2 x 106
A
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Velocity Selector: A singly-charged ion enters a velocity selector that has a 0.18-T magnetic field perpendicular to an electric field of 1.6 kV/m, with both fields perpendicular to the velocity of the ion. The same magnetic field is then used to deflect the ion into a circular path of radius 12.5 cm. (e = 1.60 × 10-19 C)(a) What velocity was selected by the velocity selector?(b) What was the mass of the ion?
What will be an ideal response?
In England in the Middle Ages an extensive system of canals was used for transportation. Some of these canals crossed over canyons by flowing over bridges (viaducts). Suppose that a heavily loaded barge crossed over such a waterway bridge
A) The force downward on the bridge would increase because of the added weight of the barge. B) The force on the bridge would not change when the barge passed over. C) The force on the barge would become less because some water would be squeezed off of the bridge. D) The force on the bridge would become less because of the buoyancy effect of the water on the barge. E) Whether or not the force on the bridge would increase or decrease would depend on whether the water was flowing or stationary.
The innermost satellite of Jupiter orbits the planet with a radius of 422 × 103 km and a period of 1.77 days. What is the mass of Jupiter? (G = 6.67 × 10-11 N ? m2/kg2 )
A) 1.33 × 1027 kg B) 1.50 × 1027 kg C) 1.72 × 1027 kg D) 1.89 × 1027 kg E) 3.08 × 1027 kg
The lowest energy level of an atom (n = 1) is called the ______________
Fill in the blank(s) with correct word