A person makes ice tea by adding ice to 1.8 kg of hot tea, initially at 80°C. How many kilograms of ice, initially at 0°C, are required to bring the mixture to 10°C?
A)
1.0 kg
B)
1.2 kg
C)
1.4 kg
D)
1.5 kg
E)
1.7 kg
C
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All supernova remnants contain pulsars
a. True b. False Indicate whether the statement is true or false
How do the speeds at which we are moving with Earth's rotation and orbit compare to the speeds of more familiar objects?
A) Earth's rotation carries most people around the axis faster than a commercial jet travels, and Earth's orbit carries us around the Sun faster than the Space Shuttle orbits Earth. B) Earth's rotation carries most people around the axis at about the speed of a commercial jet, and Earth's orbit carries us around the Sun at a higher speed. C) Earth's rotation carries most people around the axis at about the speed of a car on the freeway, and Earth's orbit carries us around the Sun at about the speed of a commercial jet. D) Earth's rotation carries most people around the axis at about the speed at which the Space Shuttle orbits Earth, and Earth's orbit carries us around the Sun at nearly the speed of light.
Most of the matter in the universe is dark matter
Indicate whether the statement is true or false
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