On the way to lower floors, an elevator begins its descent from rest at a constant acceleration, descending the first 5.0 m in 0.85 s. What is the apparent weight of a 75 kg man inside the accelerator during this time interval?
A. 0.74 kN
B. 1.8 kN
C. 0.30 kN
D. 1.0 kN
B. 1.8 kN
Physics & Space Science
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Which of the following does not take place in a chemical reaction?
a. New substances are formed. b. Neutrons are released. c. Energy is released or absorbed. d. Reactants disappear.
Physics & Space Science
A few dozen supermassive black holes have measured masses, and in each case, the mass of the black hole is about _____ the mass of the surrounding central bulge
A) 0.005 percent B) 0.05 percent C) 0.5 percent D) 5 percent
Physics & Space Science
Who, in 1925, postulated that matter, as well as light, has properties of both waves and particles?
a. Planck b. Heisenberg c. de Broglie d. Einstein
Physics & Space Science
Potential: The electron-volt is a unit of
A. charge. B. electric potential. C. electric field. D. electric force. E. energy.
Physics & Space Science