A block is given a very brief push up a 20.0° frictionless incline to give it an initial speed of 12.0 m/s
(a) How far along the surface of the plane does the block slide before coming to rest?
(b) How much time does it take to return to its starting position?
What will be an ideal response?
Answer: (a) 21.5 m (b) 7.16 s
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An 8 000-kg aluminum flagpole 100-m high is heated by the sun from a temperature of 10°C to 20°C. Find the increase in internal energy (in J) of the aluminum. (The coefficient of linear expansion is 24 × 10^-6 (°C)-1, the density is 2.7 × 10^3 kg/m3, and the specific heat of aluminum is 0.215 cal/g×°C.)
a. 7.2 × 10^5 b. 7.2 × 10^7 c. 7.2 × 10^3 d. 7.2 × 10^1 e. 7.2 × 10^2
Simple Pendulum: On the Moon, the acceleration of gravity is g/6. If a pendulum has a period T on Earth, what will its period be on the Moon?
A. T
B. T/
C. T/6
D. 6T
E. T/3
The lattice parameter of nickel is 0.352 nm, and for copper it is 0.363 nm. The electronegativities are 1.8 and 1.9, respectively, and they are both FCC metals. It is expected that there is _____________solid solubility of nickel in solid copper at elevated temperature.
Fill in the blank(s) with the appropriate word(s).
The H? line has a wavelength of 434.0 nm when observed in the laboratory. If the H? line appears in a stars spectrum at 434.5 nm, what is the radial velocity of the star?
a. 346 km/s away from the observer b. 346 km/s toward the observer c. 1.3 × 10^8 m/s away from the observer d. 1.3 × 10^8 m/s toward the observer e. The radial velocity of the star cannot be determined from this information.