Refer to the graph. For the entire motion, the average velocity is
A. positive.
B. negative.
C. zero (it is not moving).
D. It is not possible to tell from the graph
Answer: B
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A(n)__________is a sensitive astronomical instrument that measures the brightness of individual objects very precisely
A) photometer B) grating C) charge-coupled device D) array detector
A fixed amount of ideal gas goes through a process abc. In state a, the temperature of the gas is 152°C, its pressure is 1.25 atm, and it occupies a volume of 0.250 m3
It then undergoes an isothermal expansion to state b that doubles its volume, followed by an isobaric compression back to its original volume at state c. (Hint: First show this process on a pV diagram.) The ideal gas constant is 8.314 J/mol ? K, and 1.00 atm = 1.01 × 105 Pa. (a) How many moles does this gas contain? (b) What is the change in the internal energy of the gas between states a and b? (c) What is the net work done on (or by) this gas during the entire process? (d) What is the temperature of the gas in state c?
If we restrict the vibrations of the electric field vector of a wave to one direction, the wave is said to be linearly ______________
Fill in the blank(s) with correct word
The position x, in meters, of an object is given by the equation x = A + Bt + Ct2, where t represents time in seconds. What are the SI units of A, B, and C?
A) m, m, m B) m, s, s C) m, s, s2 D) m, m/s, m/s2 E) m/s, m/s2, m/s3