The direction of an electric field is from higher to lower potential
Indicate whether the statement is true or false
TRUE
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The nearest star is at a distance of 4.4 light-years. Given that light travels at 300,000 km/s in space, how far away is the nearest star in kilometers (km)?
A) 4.2 1013 km B) 2.7 1015 km C) 3.0 108 km D) 9.5 1012 km
A rock is projected from the edge of the top of a building with an initial velocity of 12.2 m/s at an angle of 53° above the horizontal. The rock strikes the ground a horizontal distance of 25 m from the base of the building. Assume that the ground is level and that the side of the building is vertical. How tall is the building?
A. 25.3 m B. 29.6 m C. 27.4 m D. 23.6 m E. 18.9 m
Why use an interferometer?
A. It can detect light at wavelengths not available to single telescopes. B. Its two widely spaced mirrors act like one giant telescope with increased collecting area. C. Its two widely spaced mirrors act like one giant telescope with increased resolving power. D. By putting one mirror above the other you can make the instrument much smaller.
Earthquake waves are classified as P waves and S waves. Which of the following statements is true about these waves?
a. The P wave is transverse as is the S wave. b. The P wave is longitudinal as is the S wave. c. The P wave is transverse and the S wave is longitudinal. d. The P wave is longitudinal and the S wave is transverse. e. Both the P and S waves are mixtures of longitudinal and transverse waves.