During the Apollo flights to the Moon a well-known TV newscaster made the following statement, "The Apollo space craft is now leaving the gravitational force of Earth." This statement is incorrect. He should have said that the space craft
A. was attracted only by the Moon.
B. was attracted only by the Sun
C. was attracted more by the Moon than by Earth.
D. entered a region of space where there were no
Answer: C. was attracted more by the Moon than by Earth.
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Which of the following is not an advantage of superplastic forming?
(a) The part is close to its final dimensions. (b) A high strain is possible (c) Parts can be diffusion bonded. (d) High strain rates are possible.
What is a base?
A) anything that accepts a hydrogen ion B) anything that accepts a hydroxide ion C) anything that donates a hydroxide ion D) anything that can be used to clean drains E) anything with a bitter taste
An electron is accelerated from rest through a potential difference of 50.0 kV. What is the speed of the electron? (c = 3.00 × 108 m/s, e = 1.60 × 10-19 C, mel = 9.11 × 10-31 kg)
A) 1.24 × 108 m/s B) 1.33 × 108 m/s C) 3.24 × 108 m/s D) 3.33 × 108 m/s E) 4.12 × 108 m/s
A ball is tossed vertically upward. When it reaches its highest point (before falling back downward)
A) the velocity, acceleration, and the force of gravity on the ball all reverse direction. B) the velocity and acceleration reverse direction, but the force of gravity on the ball remains downward. C) the velocity is zero, the acceleration is zero, and the force of gravity acting on the ball is directed downward. D) the velocity is zero, the acceleration is directed downward, and the force of gravity acting on the ball is directed downward. E) the velocity is zero, the acceleration is zero, and the force of gravity acting on the ball is zero.