Apparent visual magnitudes describe how stars look to human eyes observing from Earth
Indicate whether the statement is true or false
True
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Two identical blocks fall a distance H. One falls directly down; the other slides down a frictionless incline. Which has the larger speed at the bottom?
An electrical power plant manages to send 88% of the heat produced in the burning of fossil fuel into the water-to-steam conversion. Of the heat carried by the steam, 30% is converted to the mechanical energy of the spinning turbine. Which of the following choices best describes the overall efficiency of the heat-to-work conversion in the plant (as a percentage)?
a. greater than 88% c. 30% b. 64% d. less than 30%
The ________ theory was based on the assumption that the universe was eternal and unchanging
a. inflationary b. accelerating c. steady-state d. big bang
Ideal Gas Law: A 20.0-L pressure vessel holds 2.00 mol of oxygen at 30°C. What is the pressure inside the vessel? (R = 8.31 J/mol ? K)
A. 101 Pa B. 101 kPa C. 1.01 MPa D. 2.52 MPa E. 252 kPa