An object is placed 9.5 cm from a lens of focal length 24 cm. (a) Where is the image formed? (b) What is the magnification?
What will be an ideal response?
(a) 16 cm from the lens on the same side as the object
(b) m = 1.7
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Why do almost all moons exhibit synchronous rotation in which they rotate with the same period as they orbit their planet?
A) The moons formed this way, with the same rotational and orbital periods. B) Most jovian moons were formed out of their planet's nebula with the same orbital period. C) The moons probably once orbited farther away and more slowly, but friction with solar nebula gas caused their orbits to come closer to their planet, speeding them up. D) The moons probably once rotated faster, but tidal friction slowed their rotations to match their orbital periods. E) Synchronous rotation is caused by orbital resonances with other moons.
On a very cold day, a child puts his tongue against a fence post. It is much more likely that his tongue will stick to a steel post than to a wooden post. This is because:
A. steel has a higher specific heat B. steel is a better radiator of heat C. steel has a higher specific gravity D. steel is a better heat conductor E. steel is a highly magnetic material
A 5.0-kg stone is thrown upward at 7.5 m/s at an angle of 51° above the horizontal from the upper edge of a cliff, and it hits the ground 1.5 s later. Neglect air. Find the magnitude of its velocity vector just as it reaches the ground
What will be an ideal response?
A rock is moving with speed v. If the mass of the rock were tripled and the speed were reduced to v/3, which of the following statements would be true?
a. The kinetic energy of the rock is smaller than in the first case, but the momentum is larger. b. The kinetic energy of the rock is smaller than in the first case, but the momenta of both are the same. c. The kinetic energies of the rocks are the same in both cases. d. The kinetic energy of the rock is 1/9 its previous value.