An atom with fewer electrons than protons is a negative ion
Indicate whether the statement is true or false
F
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If you could find a bathtub big enough for Saturn, the planet would
A) explode due to its liquid metallic hydrogen. B) sink due to its metallic interior. C) catch fire, as liquid sodium reacts with water. D) float. E) precipitate more helium.
Doug hits a hockey puck, giving it an initial velocity of 6.0 m/s. If the coefficient of kinetic friction between ice and puck is 0.20, how far will the puck slide before stopping?
a. 14 m b. 19 m c. 9 m d. 11 m e. 24 m
A machine gear consists of 0.40 kg of iron and 0.16 kg of copper. How much total heat is generated in the part if its temperature increases by 35°C? (Specific heats of iron and copper are 450 and 390 J/kg • °C, respectively.)
a. 910 J c. 4000 J b. 8500 J d. 5300 J
New telescopes are using "adaptive optics.". What is that?
a. using parabolic instead of spherical mirrors b. using computer image processing to enhance images c. building mirrors in hexagonal segments d. continually adjusting the mirror's shape during observations