3. A hydrogen-filled balloon that weighs 10 N must displace_ N of air in order to float in air. Ifit displaces less than _N it will be buoyed up with less than N and sink.
Ifit displaces more than
N of air it will move upward.
RATS TO YOU TOO,
DANIEL BERNOULLI!
4. Why is the cartoon more humorous to physics
types than to non-physics types? What physics
has occurred?

Note: the following questions are unrelated to the balmer series or the martian. refer to your course notes. a sun-sized star will spend most of its lifetime as a: white dwarf b. red giant c. protostar d. main-sequence star

Lightning is an example of what phenomenon? a release of a large amount of energy an absorption of a large amount of energy a natural electric circuit a natural electric current

Acommercial refrigerator with refrigerant-134a as the working fluid is used to keep the refrigerated space at -35°c by rejecting waste heat to cooling water that enters the condenser at 18°c at a rate of 0.25 kg/s and leaves at 26°c. the refrigerant enters the condenser at 1.2 mpa and 50°c. if the compressor consumes 3.3 kw of power, determine (a) the mass flow rate of the refrigerant, (b) the refrigeration load, (c) the cop, and (d) the minimum power input to the compressor for the same refrigeration load.