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Chapter 1: Q4CQ (page 32)
What determines the validity of a theory?
The theory is a well-explained aspect of law, concept, fact, and hypothesis. It is also the verbal explanation of a formula or concept.
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Certain criteria must be satisfied if a measurement or observation is to be believed. Will the criteria necessarily be as strict for an expected result as for an unexpected result?
Approximately how many atoms thick is a cell membrane, assuming all atoms there average about twice the size of a hydrogen atom?
A short circuit in a\(120{\rm{ }}V\) appliance cord has a \(0.500{\rm{ }}\Omega \) resistance. Calculate the temperature rise of the \(2.00{\rm{ }}g\) of surrounding materials, assuming their specific heat capacity is and that it takes \(0.0500{\rm{ }}s\) for a circuit breaker to interrupt the current. Is this likely to be damaging?
(a) What is the final speed of an electron accelerated from rest through a voltage of \(25.0{\rm{ }}MV\) by a negatively charged Van de Graaff terminal? (b) What is unreasonable about this result? (c) Which assumptions are responsible?
A person measures his or her heart rate by counting the number of beats in 30 s. If are counted in, what is the heart rate and its uncertainty in beats per minute?
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