Which of the following statements is true of a carbon nucleus?
A) It has six times more positive electric charge than hydrogen.
B) It has a lower Coulomb barrier than hydrogen.
C) It has more protons as compared with oxygen nucleus.
D) It has more protons as compared with nitrogen nucleus.
A
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An airplane is flying at a speed of 200 m/s in level flight at an altitude of 800 m. A package is to be dropped from the airplane to land on a target on the ground
At what horizontal distance away from the target should the package be released so that it lands on the target? A) 2.55 km B) 125 m C) 326 m D) 786 m E) 1.22 km
A corner cube is formed by three plane mirrors perpendicular to one another resulting in a retroreflector. What is the angle between the directions of an incoming ray of light and of the corresponding outgoing ray of light for this device?
a. 90° b. 180° c. 0° d. 360°
Which of the following combinations of circuit components can be used to make a tuner for a radio, to select the desired frequency?
a. fixed inductor, variable resistor b. fixed resistor, variable inductor c. fixed inductor, variable capacitor d. fixed capacitor, variable resistor
Detailed mapping of the ocean floors revealed
A) huge mountain ranges beneath the oceans. B) deep trenches near some of the continents. C) that the oceans are equally deep at all locations. D) huge mountain ranges on the ocean floor, and deep trenches near some of the continents.