While a car travels around a circular track at a constant speed, its
A) acceleration is zero.
B) velocity is zero.
C) inertia is zero.
D) none of the above
Answer: D
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Fluid Flow: Water, which we can treat as ideal and incompressible, flows at 12 m/s in a horizontal pipe with a pressure of 3.0 × 104 Pa. If the pipe widens to twice its original radius, what is the pressure in the wider section?
A. 3.0 × 104 Pa B. 4.9 × 104 Pa C. 7.4 × 104 Pa D. 9.8 × 104 Pa
A laser beam strikes a plane's reflecting surface with an angle of incidence of 43°. What is the angle between the incident ray and the reflected ray?
A) 43° B) 86° C) 45° D) 90° E) 0°
An engine’s tank is filled with water. When the engine operates, it slowly freezes the water in the tank, converting the energy released to mechanical energy.
A. first kind B. second kind
The axes on a Hertzsprung-Russell (H-R) diagram represent ________
A) mass and radius B) luminosity and surface temperature C) mass and luminosity D) luminosity and apparent brightness