Besides the aerosol sprays, another source of chlorofluorocarbons is
A) fossil fuels.
B) biomass fuels.
C) Both of the above.
D) refrigerants.
E) jet exhaust.
D
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Two bodies P and Q on a smooth horizontal surface are connected by a light cord. The mass of P is greater than that of Q
A horizontal force (of magnitude F) is applied to Q as shown in the figure, accelerating the bodies to the right. The magnitude of the force exerted by the connecting cord on body P will be A) zero. B) less than F but not zero. C) equal to F. D) greater than F.
A rocket is moving at 1/4 the speed of light relative to Earth. At the center of this rocket, a light suddenly flashes. To an observer at rest in the rocket,
A) the light will reach the front of the rocket at the same instant that it reaches the back of the rocket. B) the light will reach the front of the rocket before it reaches the back of the rocket. C) the light will reach the front of the rocket after it reaches the back of the rocket.
A molecule of roughly spherical shape has a mass of 1.80 × 10-25 kg and a diameter of 0.6 nm
If the uncertainty in the measured position of the molecule is equal to the molecular diameter, what is the minimum uncertainty in the speed of the molecule? (h = 6.626 × 10-34 J ? s) A) 100 m/s B) 10 m/s C) 0.1 m/s D) 1 m/s E) 0.01 m/s
A pinhole camera is used to photograph a 23-cm tall object at a distance of 3.0 m, the image being projected on film at a distance of 46 cm from the pinhole. What are the height and orientation of the image?
a. 3.5 cm, upright c. 12 cm, upright b. 3.5 cm, inverted d. 12 cm, inverted