The loss of an electron from a neutral helium atom results in
A) neutral hydrogen.
B) ionized hydrogen.
C) ionized helium.
D) neutral deuterium.
E) ionized deuterium.
C
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Thin Lenses: When a flower petal is 4.0 cm in front of a converging lens, the inverted image is half the height of the petal. What is the focal length of this lens?
A. 1.3 cm B. 2.0 cm C. 4.0 cm D. 5.3 cm
The figure shows the position of an object (moving along a straight line) as a function of time. Assume two significant figures in each number. Which of the following statements about this object is true over the interval shown?
A) The object is accelerating to the left. B) The object is accelerating to the right. C) The acceleration of the object is in the same direction as its velocity. D) The average speed of the object is 1.0 m/s.
Imagine another solar system, with a star more massive than the Sun. Suppose a planet with the same mass as Earth orbits at a distance of 1 AU from the star. How would the planet's year (orbital period) compare to Earth's year?
A) The planet's year would be longer than Earth's. B) The planet's year would be the same as Earth's. C) An orbit at a distance of 1 AU would not be possible around a star more massive than the Sun. D) The planet's year would be shorter than Earth's.
A firecracker explodes in midair and breaks up into many fragments. Which of the following statements are true regarding conditions immediately before and immediately after the explosion:
I. The total momentum of the fragments is equal to the original momentum of the firecracker. II. The total kinetic energy of the fragments is equal to the original kinetic energy of the firecracker. A) Statement I only B) Statement II only C) Both Statement I and Statement II D) Neither statement is true.