In a mass spectrometer where ions are fired at a given speed perpendicular to the magnetic field, what would be the ratio r20/r22 of the radii of the paths for singly-ionized neon atoms of masses 20 u and 22 u?
1.100/121
2.10/11
3.11/10
4.121/100
2
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The overflow of gasoline from a car's full metal tank on a hot day is evidence that gasoline expands
A) more than metal. B) about the same as metal. C) less than metal. D) none of the above.
How many types of quarks are there, and how many types of antiquarks?
A.) 24 quarks and 24 antiquarks. B.) 12 quarks and 6 antiquarks. C.) 6 quarks and 6 antiquarks. D.) 3 quarks and 3 antiquarks. E.) 30 quarks and 0 antiquarks.
A crate is sliding down an inclined ramp at a constant speed of 0.55 m/s. The vector sum of all the forces acting on this crate must point
A) down the ramp. B) up the ramp. C) vertically downward. D) perpendicular to the ramp. E) None of the above choices is correct.
Charges of 3.5 µC and ?7.6 µC are placed at two corners of an equilateral triangle with sides of 0.1 m. At the third corner, what is the electric field magnitude created by these two charges? (ke = 8.99 × 10^9 N·m2/C2)
a. 1.2E+7 N/C b. 3.0E+6 N/C c. 5.5E+6 N/C d. 5.9E+6 N/C e. 7.9E+6 N/C