Science can say nothing about the validity of nonscientific practices that do not make testable predictions
Indicate whether the statement is true or false
TRUE
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A 4 kilogram block of ice is removed from a freezer where its temperature was maintained at –20 degrees Celsius. How much heat does the ice absorb as it is warmed to –10 degrees? (The specific heat capacity of ice is 2,000 joules per kilogram degree Celsius.)
Two tanks of gas, one of hydrogen, H2, and one of helium, He, contain equal masses of gas. The gram-molecular mass of He is twice that of H2 . Both tanks of gas are at the same temperature, 293 K. Which statement(s) below is(are) correct when we ignore vibrational motion?
a. The total internal energy of the hydrogen is the same as that of the helium. b. The total internal energy of the hydrogen is 167 times that of the helium. c. The total internal energy of the helium is 1.67 times that of the hydrogen. d. The total internal energy of the hydrogen is 3.33 times that of the helium. e. The total internal energy of the helium is 3.33 times that of the hydrogen.
Suppose that two quantities, A and B, have different dimensions. Determine which of the following arithmetic operations could be physically meaningful
(i) A + B (ii) A/B (iii) B - A (iv) AB
1.(iv) only 2.(ii) only 3.(i) and (iii) 4.(ii) and (iv)The highest mountain on Mars is Olympus Mons, rising 22,000 meters above the Martian surface. If we were to throw an object horizontally off the mountain top, how long would it take to reach the surface? Note: Ignore atmospheric drag forces and use gMars = 3.72 m/s2
a. 1.8 minutes c. 3.0 minutes b. 2.4 minutes d. 0.79 minute