Constant Acceleration Kinematics: A car that is initially moving at 7.50 m/s begins to accelerate forward uniformly at 0.550 m/s2.(a) How long after beginning to accelerate does it take the car to move 3.50 km?(b) How fast is the car moving just as it has traveled 3.50 km?
What will be an ideal response?
(a) 1.00 × 102 s (b) 62.5 m/s
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Without greenhouse gases, the Earth's surface temperature would be:
A. Unchanged. B. Hotter in the summer and cooler in the winter. C. Hotter in the winter and cooler in the summer. D. 33 degrees Centigrade cooler. E. 33 degrees Centigrade warmer.
An enclosed chamber with sound absorbing walls has a 2.0 m × 1.0 m opening for an outside window. A loudspeaker is located outdoors, 84 m away and facing the window
The intensity level of the sound entering the window space from the loudspeaker is 56 dB. Assume the acoustic output of the loudspeaker is uniform in all directions and that acoustic energy incident upon the ground is completely absorbed and therefore is not reflected into the window. The threshold of hearing is 1.0 × 10-12 W/m2. The acoustic power output of the loudspeaker is closest to A) 0.035 W. B) 0.070 W. C) 0.18 W. D) 0.35 W. E) 0.70 W.
Stellar paralax proves that Earth is
a. rotating. b. revolving. c. precessing. d. an oblate spheroid.
Quantum mechanics has accurately described the regularities of the periodic table by assigning "quantum" numbers to predict the allowed energy levels. The true statement about quantum numbers is that
A. no two electrons in the same atom can have the same set of quantum numbers. B. there are never more than 8 different sets of quantum numbers in an atom. C. they describe the position and charge of the electrons in the atoms. D. no electrons in the world can ever have the same set of quantum numbers.