The substances that are formed by a chemical reaction are called the
a. products.
b. reactants.
c. chemicals.
d. precipitates.
a
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A hockey puck slides off the edge of a table with an initial velocity of 20.0 m/s. The height of the table above the ground is 2.00 m. How far from the edge of the table, measured along the floor, does the puck hit the floor?
A) 20.0 m B) 40.0 m C) 12.8 m D) 19.6 m E) 6.4 m
A jet plane travels around the world at 2 000 mi/hr (894 m/s). Two accurate atomic clocks measure the times of flight, one on board the plane and the second on Earth. If it takes 12 hours to complete the journey, what will the time difference (in ?s) be?
a. 0.75 b. 0.50 c. 0.25 d. 1.0 e. 0.19
A radioactive atom has 98 protons and 249 nucleons. If it undergoes alpha decay, what are the number of protons and nucleons, respectively, in the daughter nucleus?
A) 96, 247 B) 94, 247 C) 96, 245 D) 100, 249 E) 100, 245
What does Hubble's law tell us?
A) The more distant a galaxy, the faster it is moving away from us. B) The faster a spiral galaxy's rotation speed, the more luminous it is. C) The longer the period of a Cepheid variable, the greater its luminosity. D) For every force, there is an equal and opposite reaction force.