Which contains more atoms?
A) 1 kg of hydrogen
B) 1 kg of iron
C) both contain the same
Answer: A
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In 1989, Neptune was found to have a huge storm named the:
A) South Tropical Disturbance. B) Great Red Spot. C) Great Dark Spot. D) Hellas Basin. E) Galileo Regio.
If a force always acts perpendicular to an object's direction of motion, that force cannot change the object's kinetic energy
A) True B) False
A 15-?F air-filled capacitor is connected to a 50-V voltage source and becomes fully charged. The voltage source is then removed and a slab of dielectric that completely fills the space between the plates is inserted
The dielectric has a dielectric constant of 5.0. (a) What is the capacitance of the capacitor after the slab has been inserted? (b) What is the potential difference across the plates of the capacitor after the slab has been inserted?
In ?- decay, the number of protons in the nucleus is
A) decreased by 1. B) decreased by 2. C) increased by 1. D) increased by 2. E) remains unchanged.