A 30.00 kg box slides up a 12.00 meters long incline at an angle of 30.00 degrees above the horizontal. Friction is negligible. The change in gravitational potential energy is
A. 2110 J.
B. 1467 J.
C. 1080 J.
D. 1764 J.
E. 760.0 J.
D. 1764 J.
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Young's Modulus: An aluminum wire and a steel wire, each of length 2.0 m, are hung from the ceiling. A 5.0-kg mass is suspended from the lower end of each wire. The aluminum wire has a diameter of 2.2 mm. What must be the diameter of the steel wire if it is to stretch the same distance as the aluminum wire, so that the two wires maintain equal lengths after the masses are attached? Young's modulus for aluminum is 0.70 × 1011 Pa and for steel it is 2.0 × 1011 Pa.
Fill in the blank(s) with the appropriate word(s).
If the distance between two negative point charges is increased by a factor of two, the resultant potential energy is what factor times the initial potential energy?
a. 2 c. 1/4 b. 1/2 d. 4
Briefly describe Mars's surface
What will be an ideal response?
If the density of the universe is equal to the critical density, and H equals 50 km/s/Mpc, then the true age of the Universe is 13.3 billion years
a. True b. False Indicate whether the statement is true or false