An athlete competing in the long jump leaves the ground with a speed of 9.14 m/s at an angle of 55° with the vertical. What is the length of the athlete's jump if air is of no significance?
A) 0.88 m
B) 8.0 m
C) 12 m
D) 17 m
E) 4.0 m
B
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Why did the solar nebula heat up as it collapsed?
A) Nuclear fusion occurring in the core of the forming Sun produced energy that heated the nebula. B) As it shrank in size, gravitational potential energy was converted to thermal energy. C) It was heated by radiation from nearby stars. D) The shock wave from a nearby supernova heated the gas. E) Collisions among planetesimals generated friction and heat.
The Trifid Nebula is an example of a(n) ________ nebula
Fill in the blank(s) with correct word
Which of the following statements about Gauss's law are correct? (There may be more than one correct choice.)
A) Gauss's law is valid only for symmetric charge distributions, such as spheres and cylinders. B) If there is no charge inside of a Gaussian surface, the electric field must be zero at points of that surface. C) Only charge enclosed within a Gaussian surface can produce an electric field at points on that surface. D) If a Gaussian surface is completely inside an electrostatic conductor, the electric field must always be zero at all points on that surface. E) The electric flux passing through a Gaussian surface depends only on the amount of charge inside that surface, not on its size or shape.
When ImageRa decays by emitting an alpha particle, what is the atomic number of the resulting nucleus? What is the resulting atomic mass?
A) atomic number = 86; atomic mass = 222 B) atomic number = 87; atomic mass = 226 C) atomic number = 86; atomic mass = 224 D) atomic number = 87; atomic mass = 224