A 2.5-kg object falls vertically downward in a viscous medium at a constant speed of 2.5 m/s. How much work is done by the force the viscous medium exerts on the object as it falls 80 cm?
a. +2.0 J
b. +20 J
c. -2.0 J
d. -20 J
e. +40 J
D
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Bond energies increase in going from C-N (lowest) to C-O to C-F (highest). Explain this trend based upon the atomic sizes of these atoms as deduced from their positions in the periodic table
A) In going from nitrogen to oxygen to fluorine the atoms get larger. This means a greater nuclear charge, which translates into stronger chemical bonds. B) In going from nitrogen to oxygen to fluorine the atoms get smaller. This means a greater nuclear charge, which translates into stronger chemical bonds. C) In going from nitrogen to oxygen to fluorine the atoms get larger. This means that the bonding atoms are farther apart, which translates into a greater bond energy. D) In going from nitrogen to oxygen to fluorine the atoms get smaller. This means that the bonding atoms are closer together, which translates into a greater bond energy.
Waves carry energy
a. True b. False Indicate whether the statement is true or false
Write the node equation for node 12, which is at the junction of two different materials, A and B as shown. The following properties are given:
In the context of the Doppler effect, which of the following is a difference between a blueshift and a redshift?
A) Unlike a redshift, a blueshift is caused by a velocity of recession. B) Unlike a blueshift, a redshift is based on the Hubble's law. C) Unlike a redshift, a blueshift is a shift toward shorter wavelengths. D) Unlike a blueshift, a redshift is based on a light source moving closer to an object.