A projectile is fired from ground level at an angle of 40.0° above horizontal at a speed of 30.0 m/s. What is the speed of the projectile when it has reached a height equal to 50.0% of its maximum height?
A) 26.7 m/s B) 26.0 m/s C) 28.7 m/s D) 27.4 m/s E) 28.1 m/s
A
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Transformers: The primary of an ideal transformer has 100 turns and its secondary has 200 turns. If the input voltage to the primary is 100 V, we can expect the output voltage of the secondary to be
A. 50 V. B. 100 V. C. 200 V. D. none of the given answers.
Which of the following statements about the Moon is not correct?
A. The acceleration due to gravity on the Moon is weaker than on Earth. B. Earth's gravitational pull on the Moon equals the Moon's gravitational pull on Earth. C. There is a net force acting on the Moon. D. The Moon is not accelerating.
Which of the following observations is not a piece of evidence supporting the Big Bang theory?
A) darkness of the night sky B) recession speeds of far away galaxies relative to close ones C) observed helium abundance in the universe D) relative motions of galaxies in the Local Group
In common transparent media, as the frequency of light increases, the index of refraction
A) increases. B) stays constant. C) decreases. D) varies as the sine of the incident angle.