The electron orbiting the proton in the hydrogen atom is at a distance 
m. What is the ratio of the electric force to the gravitation force between these particles? (The mass of the proton is 1.67
kg and the mass of the electron is 
a. 
b. 
c. 
d. 
e. 
a.
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A 4.00 kg object is moving at 5.00 m/s NORTHWEST. It strikes a 6.00 kg that is moving SOUTHWEST at 2.00 m/s. The objects have a completely inelastic (stick together) collision. The velocity of the 6.00 kg object after the collision is
A. 2.33 m/s at an angle of 45.0 degrees NORTH of WEST. B. 3.89 m/s at an angle of 35.0 degrees NORTH of WEST. C. 3.89 m/s at an angle of 14.0 degrees NORTH of WEST. D. 2.33 m/s at an angle of 14.0 degrees NORTH of WEST. E. 2.33 m/s at an angle of 35.0 degrees NORTH of WEST.
If the dielectric breakdown field in air is 3 × 10^6 V/m, what potential difference is involved with a 3 cm spark?
a. 1.0 × 10^8 V c. 9 × 10^4 V b. 9 × 10^6 V d. 1.0 × 10^10 V
Two-thirds of all known millisecond pulsars are found in what type of object?
A) open clusters B) extremely distant galaxies C) giant molecular clouds D) globular clusters E) emission nebulae
Which position in this diagram represents Earth at the beginning of spring for the Southern Hemisphere?
A) 1 B) 2 C) 3 D) 4