A magnifying glass with focal length 15 centimeters is placed 12 centimeters above a stamp. (a) Where is the image? (b) What is the magnification? (c) Is the image produced a real or a virtual image?
(a) 60 cm below the magnifying glass, (b) 5, (c) virtual
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The motions of a car and a truck along a straight road are represented by the velocity-time graphs in the figure. The two vehicles are initially alongside each other at time t = 0. At time T, what is true about these two vehicles since time t = 0?
A) The truck will have traveled further than the car. B) The car will have traveled further than the truck. C) The truck and the car will have traveled the same distance. D) The car will be traveling faster than the truck.
Under which circumstances can you be sure that the thermal pressure within a gas cloud is increasing?
A) The cloud's temperature and density are both increasing. B) The cloud's temperature is increasing and its density is decreasing. C) The cloud's temperature and density are both decreasing. D) The cloud's temperature is decreasing and its density is increasing. E) It is impossible to say.
A 0.30 kg mass is suspended on a string. In equilibrium the mass stretches the spring 2.0 cm downward. The mass is then pulled an additional distance of 1.0 cm down and released from rest
(a) Write down its equation of motion. (b) Calculate the velocity of the mass at T/3 s.
What kind of plate boundary separates the South American Plate from the African Plate?
What will be an ideal response?