A chemical change results in
A) new atoms.
B) a physical change.
C) new materials.
D) a new phase.
Answer: C
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A gold atom has an atomic number of 79 and an atomic mass number of 197. If it is neutral, how many protons, neutrons, and electrons does it have?
A) 79 protons, 118 neutrons, 79 electrons B) 79 protons, 118 neutrons, 118 electrons C) 79 protons, 118 neutrons, 39 electrons D) 118 protons, 79 neutrons, 118 electrons E) 118 protons, 39 neutrons, 118 electrons
Vector 1 is 7 units long and is at 70°. Vector 2 is 5 units long and is at 155°. Vector 3 is 3 units long and is at 225°. Which vector has equal-magnitude components?
a. Vector 1 b. Vector 2 c. Vector 3 d. None of the vectors has equal-magnitude components.
A 14,000-kg boxcar is coasting at 1.50 m/s along a horizontal track when it hits and couples with a stationary 10,000-kg boxcar. What is the speed of the cars after the collision?
What will be an ideal response?
A neutron star has approximately the density of nuclear material. If a neutron star is the mass of the sun, 1.99 x 1030kg, what would be its radius? You may wish to use the relationship r=(1.2 fm)A1/3 together with the mass of a proton, 1.67 x 10-27kg, to estimate.
A. 12 km B. 19 km C. 13 km D. 9.8 km