This image shows Pluto photographed by the New Horizons spacecraft in 2015. What did scientists find most surprising when they saw this image?
A) the smooth areas and other features suggesting relatively recent geological activity
B) the round shape
C) the presence of numerous impact craters
D) the fact that the entire face shown is sunlit in this photo
A) the smooth areas and other features suggesting relatively recent geological activity
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Calorimetry: A 600-g piece of iron at 100°C is dropped into a calorimeter of negligible heat capacity containing 100 g of ice at 0°C and 120 g of water, also at 0°C. What is the final temperature of the system? The specific heat of iron is 448 J/kg ? K, the latent heat of fusion of water is 33.5 × 104 J/kg, and the specific heat of water is 4186 J/kg ? K.
What will be an ideal response?
Which tin can will roll down an incline in the shortest time, one filled with water or one filled with ice? (Hint: water 'slides' inside the can.)
A) with water B) with ice C) both the same D) need more information
Large amounts of material can often be seen rising from the cooling towers often seen at steam-electric power plants. These emissions are mostly
A) radioactive waste. B) soot. C) oxides of sulfur. D) water vapor, i.e., steam. E) carbon dioxide.
A proton is placed in an electric field of intensity 700 N/C
What are the magnitude and direction of the acceleration of this proton due to this field? (mproton = 1.67 × 10-27 kg, e = 1.60 × 10-19 C) A) 6.71 × 109 m/s2 opposite to the electric field B) 6.71 × 1010 m/s2 opposite to the electric field C) 6.71 × 1010 m/s2 in the direction of the electric field D) 67.1 × 1010 m/s2 opposite to the electric field E) 67.1 × 1010 m/s2 in the direction of the electric field