An airplane flies at a constant speed at an angle of 25 degrees above the horizontal. Which statement below is not true?
A. The net force on the plane is zero.
B. The lift is the same magnitude as the weight.
C. The plane has a constant velocity.
D. The thrust is greater in magnitude than the drag.
B. The lift is the same magnitude as the weight.
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Indicate whether the statement is true or false
Your rearview mirror states "OBJECTS IN THIS MIRROR ARE CLOSER THAN THEY APPEAR." The mirror is
A. convex B. concave C. planar
Which of the following is a vector quantity?
A) area B) volume C) mass D) none of the above
Why is the air over an open flame always moist?
A) The hot flame vaporizes the water in the air above the flame. B) One of the products of combustion is water vapor. C) Warm air contains more humidity than cold air. D) None of the above is true.