When the equation Ca + H3PO4? Ca3(PO4)2 + H2 is balanced, the sum of all the coefficients (both written and "understood") is ______________
Fill in the blank(s) with correct word
9 (coefficients in order are 3, 2, 1, 3)
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There must be equal amounts of mass on both sides of the center of mass of a system
A) True B) False
At a distance of 14,000 km from the center of Planet Z-99, the acceleration due to gravity is 32 m/s2. What is the acceleration due to gravity at a point 28,000 km from the center of this planet?
A) 8.0 m/s2 B) 16 m/s2 C) 128 m/s2 D) 4.0 m/s2 E) 2.0 m/s2
A 1.5-kg mass attached to spring with a force constant of 20.0 N/m oscillates on a horizontal, frictionless track
At t= 0, the mass is released from rest at x= 10.0 cm. (That is, the spring is stretched by 10.00 cm.) (a) Determine the frequency of the oscillations. (b) Determine the maximum speed of the mass. Where does the maximum speed occur? (c) Determine the maximum acceleration of the mass. Where does the maximum acceleration occur? (d) Determine the total energy of the oscillating system. (e) Express the displacement as a function of time.
If the rest wavelength of a certain line is 600 nm, but we observe it at 594 nm, then:
A) the source is approaching us at 1 % of the speed of light. B) the source is approaching us at 0.1 % of the speed of light. C) the source is receding from us at 10% of the speed of light. D) the source is getting 1% hotter as we watch. E) the source is spinning very rapidly, at 1% of the speed of light.