Joshua is attracted toward Earth by a 500-N gravitational force. The Earth is attracted toward Joshua with a force of

A gas is placed in a thermally insulated container as shown below

As the piston is slowly raised...

1.... the gas gives off heat to the environment (Q<0). 2.... the gas absorbs heat from the environment (Q>0). 3.... the gas does not exchange any heat with the environment (Q=0). 4.The heat exchanged with the environment cannot be determined.

Based on our current Gregorian calendar, which of the following years is not a leap year?

A) 2000 B) 2004 C) 2008 D) 2012 E) All of the above are leap years.

The intensity at a distance of 6.0 m from a source is 6 × 10-10 W/m2

(a) What is the power level emitted by the source? (b) What is the intensity level in dB?

A planar cross section through two spherical waves emanating from the sources S1 and S2 in the plane is shown in the figure. The black circles are one and two wavelengths from their respective sources. The lighter circles are one-half and one-and-a-half wavelengths distant from their respective sources. If the phase at S1 and S2 is zero at this instant, and the waves shown arriving at P2 both arrive with amplitude A, the difference in phase angle at point P2 (in radians) is ? ?

A. 0. B. ?/2. C. ?. D. 3?/2. E. 2?.