The price of gasoline goes up 6% on Monday night and then goes down 7% today. What is the net percentage change in the price of gasoline from Monday?
A. 1.0%
B. 2.0%
C. 1.4%
D. -1.0%
C. 1.4%
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An object of mass 0.50 kg is transported to the surface of Planet X where the object's weight is measured to be 20 N. The radius of the planet is 6.0 × 10^6 m. What is the mass of Planet X? (G = 6.67 × 10^?11 N / m2/kg2)
a. 1.80E+18 kg b. 5.40E+24 kg c. 2.16E+25 kg d. 1.80E+18 kg
Water-90% triethylene glycol is to be used to dry air. If the mixture is added to an air stream at 25ºC, determine the amount of mixture required per kilogram of dry air to dehumidify the air if the air stream is at 35ºC and 90% relative humidity. Assume that 25% excess mixture is required than theoretically predicted. Also determine the outlet air temperature and the relative humidity. Assume that the specific heat of triethylene glycol is 2.4 kJ/kg?K.
What will be an ideal response?
Gamma rays have less energy than infrared radiation
Indicate whether the statement is true or false
The diagram represents energy levels in a hydrogen atom. The labeled transitions (A through E) represent an electron moving between energy levels. If an electron at level 1 in a hydrogen atom absorbs 10.2 eV of energy, it moves to level 2. What typically happens next?
A) The electron returns to level 1 by emitting an ultraviolet photon with 10.2 eV of energy. B) The electron jumps to level 3 as soon as it absorbs any additional energy. C) The electron remains in level 2 until it absorbs an additional 10.2 eV of energy. D) A different electron drops into level 1 because it is now unoccupied.