The most basic and irrefutable proof that energy cannot be created out of nothing or completely destroyed is that
a. Newton's laws of motion require it.
b. no proof is necessary. Energy is energy.
c. no experiments have ever proved the contrary.
d. the Sun would long since ceased to shine.
e. it would contradict Einstein's relativity.
C
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A 5.00-g lead BB moving at 44.0 m/s penetrates a wood block and comes to rest inside the block. If half of its kinetic energy is absorbed by the BB,
what is the change in the temperature of the BB? The specific heat of lead is 128 J/kg ? K. A) 0.940 K B) 1.10 K C) 1.26 K D) 2.78 K E) 3.78 K
Suppose that at a certain time a quanton has a well-defined wavelength of 0.15 nm. At that time, we perform an experiment to locate the quanton and get the result x = 0.45 nm to a high degree of precision. What can we say about the wavelength of the quanton’s wave function after the experiment?
A. It is still 0.15 nm. B. It is now 0.30 nm. C. It is now 0.45 nm. D. It is now not well-defined. E. Other (specify).
According to our definition, we have been a technological civilization for about
A) 500 years. B) 100 years. C) 10 years. D) 1000 years. E) 10,000 years.
According to astronomers, approximately how old is the universe?
A) 14 billion years B) 14 trillion years C) infinite D) 14 million years