If the sum total mass of reactants in a nuclear reaction is greater than that of product particles, then which of the following statements best describes the conditions of the reaction?
a. reaction is exothermic
b. reaction is endothermic
c. atomic number of each reactant must be greater than 40
d. atomic number of each reactant must be less than 80
a
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Which of these does Mars NOT have to help its case of past or present life?
A) occasional water flows, and past records of much larger ones B) a protective ozone layer C) carbon dioxide to provide some greenhouse warming D) a favorable distance from the Sun E) rover discoveries of sedimentary rocks and carbonates on the surface of Mars
A television advertisement claiming that a product is light-years ahead of its time does not make sense because
A) it doesn't specify the number of light-years. B) it uses "light-years" to talk about time, but a light-year is a unit of distance. C) a light-year is an astronomically large unit, so a product could not possibly be so advanced. D) light-years can only be used to talk about light.
The distance between adjacent orbits in a hydrogen atom
A) varies randomly with increasing values of n. B) decreases with increasing values of n. C) remains constant for all values of n. D) increases with increasing values of n.
A 5-g coin is dropped from a 300-m building. If it reaches a terminal velocity of 45 m/s, and the rest of the energy is converted to heating the coin, what is the change in temperature (in °C) of the coin? (The specific heat of copper is 387 J/kg/°C.)
a. 9 b. 2 c. 5 d. 21 e. 0.5