Which of the following nuclear reactions is forbidden?
A. 
B. 
C. 
D. 
A.
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A friend says that the heavyweight champion of the world cannot exert a force of 50 N on a piece of tissue paper with his best punch. The tissue paper is held in midair, no tricks. You
A) agree that it can't be done. B) have reservations about this assertion. C) disagree, for a good punch easily delivers this much force.
According to the following balanced chemical equation, if you want to generate two moles of H2O how many grams of O2 do you need?
2 H2 + O2 ? 2 H2O A) 32 B) 16 C) 8 D) 4 E) 6.022 × 1023
Which form of electromagnetic radiation would be blocked in the stratosphere by ozone?
A) cosmic rays B) ultraviolet C) visible light D) infrared E) microwaves
What evidence do we have that pulsars are neutron stars?
What will be an ideal response?