An automobile engine takes in 4000 J of heat and performs 1100 J of mechanical work in each cycle. (a) Calculate the engine's efficiency. (b) How much heat is "wasted" in each cycle?
What will be an ideal response?
(a) 27.5% (b) 2900 J
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In tropical areas of the world where refrigeration is not readily available, people store water in unglazed clay pots. This makes the water stay at a cool temperature, much cooler than the ambient temperature. How is that possible?
What will be an ideal response?
A 9.00 kg mass is connected to a spring with a spring constant of 4.00 N/m. The velocity is given by the expression v(t) = 10.0 cm/s sin
+ 8.00 cm/s cos
What is the maximum displacement of the simple harmonic motion?
A. 25.1 cm B. 30.5 cm C. 35.3 cm D. 40.4 cm E. 45.5 cm
Does it make sense to say that a textbook is about 99.9 percent empty space?
A) No. A textbook is a solid and thus is quite dense. Therefore it is not 99.9 percent empty space. B) No. Only gases are considered to be 99.9 percent empty space. Liquids and solids are not. C) Yes. A textbook like all material things is made up of atoms, which are considered to be 99.9 percent empty space. D) No. A textbook could only be considered to be 99.9 percent empty space if it were combusted.
When a beam of light passes through a narrow slit we can observe some light in the "geometrical" shadow of the slit. This light arrived by the process of
A. diffraction. B. reflection. C. refraction. D. interference.