The intensity at a distance of 6.0 m from a source that is radiating equally in all directions is 6.0 × 10-10 W/m2. What is the power emitted by the source?
A) 2.1 × 10-8 W
B) 2.7 × 10-7 W
C) 2.1 × 10-6 W
D) 2.7 × 10-5 W
B
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What is so special about the carbonaceous chondrites
a. rich in hydrogen and helium b. rich in organic compounds c. rich in nitrogen d. rich in oxygen e. rich in rare metals, such as gold
A very light ideal spring with a spring constant (force constant) of 2.5 N/cm pulls horizontally on an 18-kg box that is resting on a horizontal floor
The coefficient of static friction between the box and the floor is 0.65, and the coefficient of kinetic friction is 0.45. (a) How long is the spring just as the box is ready to move? (b) If the spring pulls the box along with a constant forward velocity of 1.75 m/s, how long is the spring? (c) How long is the spring if it pulls the box forward at a constant 2.75 m/s?
A clear plastic sandwich bag filled with water can act as a crude converging lens in air. If the bag is filled with air and placed under water, the effective lens is
1.converging 2.diverging
the path of the Sun through the sky as a result of Earth's orbital motion
What will be an ideal response?