What is the focal length of a magnifying glass that produces an angular magnification of 7.0 x when used by a person with a near point at 28 cm?
A) 2.0 cm
B) 3.0 cm
C) 4.0 cm
D) 5.0 cm
E) 6.0 cm
C
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Work-Energy Theorem: The graph in the figure shows the magnitude of the net horizontal force Fx on a 25-kg package as a function of the position x of the package. Just before the force was applied, the package was originally sliding at 6.0 m/s in the +x direction on a smooth horizontal floor. Find the x component of the velocity of the package just after the force has stopped in each of the following cases.(a) The force is applied in the same direction as the original velocity of the box.(b) The force is applied in the opposite direction to the original velocity of the box.
What will be an ideal response?
If the Earth's rotational axis were to be perpendicular to the ecliptic, seasonal variations on the Earth would
a. be non-existent. b. remain the same as they are at now. c. have the same severity but each season would last twice as long. d. be much more severe.
Thunder is heard 2.2 seconds after Lightning is observed in Arizona when the temperature is 50°C. The best estimate of how far away the lightning struck is nearest:
(A) 820 m (B) 790 m (C) 730 m (D) 650 m
Free Fall: From the edge of a roof top you toss a green ball upwards with initial speed v0 and a blue ball downwards with the same initial speed. Air resistance is negligible. When they reach the ground below
A. the green ball will be moving faster than the blue ball. B. the blue ball will be moving faster than the green ball. C. the two balls will have the same speed.