An ideal Carnot engine has an efficiency of 83.0% and performs 4500 J of work every cycle. How much energy is discharged to the lower temperature reservoir every cycle?
A) 920 J
B) 830 J
C) 740 J
D) 3700 J
E) 5400 J
A
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A fireman, 40.0 m away from a burning building, directs a stream of water from a fire hose at an angle of 30.0° above the horizontal. If the initial speed of the stream is 40.0 m/s, at what height above the nozzle will the stream of water strike the building?
a. 9.60 m c. 18.7 m b. 16.6 m d. 22.4 m
Each of the following describes an "Atom 1" and an "Atom 2." In which case are the two atoms different isotopes of the same element?
A) Atom 1: nucleus with seven protons and eight neutrons, surrounded by seven electrons Atom 2: nucleus with seven protons and seven neutrons, surrounded by seven electrons B) Atom 1: nucleus with six protons and eight neutrons, surrounded by six electrons Atom 2: nucleus with seven protons and eight neutrons, surrounded by seven electrons C) Atom 1: nucleus with eight protons and eight neutrons, surrounded by eight electrons Atom 2: nucleus with eight protons and eight neutrons, surrounded by seven electrons D) Atom 1: nucleus with four protons and five neutrons, surrounded by four electrons Atom 2: nucleus with five protons and five neutrons, surrounded by four electrons
A 1.0-g bead is at (-2.0 cm, 2.0 cm), a 2.0-g bead is at (2.0 cm, -4.0 cm), and a 3.0-g bead is at (2.0 cm, 0.0 cm). What are the coordinates of the center of mass (or center of gravity) of this system of beads?
What will be an ideal response?
A solid object has a volume density ?0 at a temperature of 315 K. The coefficient of volume expansion for the material of which it is made is 7.00 × 10-5 K-1
What will be its density (in terms of ?0 at a temperature of 425 K, assuming that it does not melt and that its thermal properties do not change with temperature?