The point where rays intersect when leaving the lens, if they were traveling parallel to the axis when they entered the lens, is called the
A. aperture
B. surface normal
C. focal point
D. vertex
C. focal point
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A rocket engine consumes 450 kg of fuel per minute. If the exhaust speed of the ejected fuel is 5.2 km/s, what is the thrust of the rocket?
a. 42 kN b. 39 kN c. 45 kN d. 48 kN e. 35 kN
According to the principle of continuity, the velocity of a fluid multiplied by the cross section through which it flows at one point will equal the product of
A) velocity and cross section at another point. B) velocity and pressure at another point. C) a constraint factor. D) none of the above
The inner planets are composed of ____
a. rock and ice b. ice and gas c. rock and gas d. metal and ice e. rock and metal
Although Venus is farther from the Sun than Mercury, its surface temperature is hotter than Mercury's.
Answer the following statement true (T) or false (F)