A 0.140-kg baseball is thrown with a velocity of It is struck by the bat exerting an average force of 5000 N, which results in a velocity of 37.0 m/s in the opposite direction from the original velocity. How long were the bat and ball in contact?
A) 1.79 × 10-3 s
B) 1.28 × 10-2 s
C) 3.07 × 10-2 s
D) 4.30 × 10-3 s
A
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Why do we sometimes observe asteroids at the distances of the gaps in the asteroid belt?
A) Jupiter's gravitational tugs keep them there.
B) They are held in place by resonances with other asteroids.
C) Actually, we never see asteroids in the gaps.
D) They are kept in place by shepherding asteroids.
E) A gap is located at an average orbital distance, and asteroid orbits often have large eccentricities.
In the context of the electromagnetic spectrum, which of the following types of electromagnetic radiation has the longest wavelength?
A) X-rays B) Visible light C) Radio waves D) Gamma rays
What is the wavelength of the emitted photon if an electron in the hydrogen atom makes a transition from the ni = 2 to the nf = 1 state?
A) 205.2 nm B) 87.5 nm C) 91.2 nm D) 121.5 nm E) 402.1 nm
Use the periodic table to find the atomic number, number of protons, number of electrons, and number of valence electrons for each of the following elements
a. barium b. tin c. phosphorus