Which force has the smallest magnitude?
A. 
B. 
C. Both and (which are equal)
D.
E. 
E.
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How much work is done by the horizontal force Fp = 150N on the 18-kg block when the force pushes the block 5.0 m up along the 32° frictionless incline?
(b) How much work is done by the gravitational force on the block during this displacement? (c) How much work is done by the normal force? (d) What is the speed of the block (assume that it is zero initially) after this displacement?
What do we mean by a mass extinction?
A) the extinction of a large fraction of the world's plant and animal species in a relatively short period of time B) the extinction of large animals, such as dinosaurs C) an extinction caused by the impact of an asteroid or comet D) the extinction of any species of plant or animal that has mass
In state n = 1, the energy of the hydrogen atom is -13.58 eV. What is its energy in state n = 2?
A) -1.51 eV B) -6.79 eV C) -3.40 eV D) -4.53 eV E) -5.89 eV
The gas, C3H8, is used in outside grills, and several moles of this gas will burn during an afternoon's grilling. What is the mass of one molecule of this gas?
a. 4.4 × 10^–23 g b. 7.3 × 10^–23 kg c. 7.3 × 10^–26 kg d. 8.8 × 10^–26 kg