Three masses are located as follows: a 3.0-kg mass is at the origin, a 4.5-kg mass at (0.0 m, 4.0 m), and a 2.5-kg mass at (3.0 m, 0.0 m). What is the gravitational energy of the system of masses? G = 6.67 x 10-11 N•m2/kg2
A) -3.8 × 10-10 J
B) -3.9 × 10-10 J
C) -5.4 × 10-10 J
D) -3.2 × 10-10 J
E) -3.5 × 10-10 J
C
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What is the temperature of 3.0 moles of gas at a pressure of 250 kPa held in a volume of 15 L?
A) 150 K B) 200 K C) 250 K D) 300 K E) 350 K
A skillet is lined with a thin layer of cooking oil followed by a layer of unpopped popcorn kernels. Upon heating the kernels all pop thereby escaping the skillet. Which of the following physical and/or chemical changes occurred?
A) The water within each kernel is heated to the point that it would turn into water vapor as the kernels popped (physical change). B) The starches within the kernels are cooked by the high temperatures (chemical change). C) Both A and B occur. D) Physical and chemical changes cannot occur without a real chemical reaction taking place.
What produces the blueish haze in the middle of the Crab Nebula?
A.) It is primarily from emission lines of oxygen. B.) It is produced by smashing streams of gas. C.) It is produced by accelerated electrons. D.) It is a condensing Hydrogen cloud. E.) We don't know.
Fragmenting during meteorite impacts caused the vesicular basalts found among the lunar samples
Indicate whether the statement is true or false