Physics Answers

An object is placed in front of spherical mirror, and the magnification of the system is m = -6. What does this number tell you about the image?

Calculate the velocity of longitudinal waves in mercury if the bulk modulus of mercury is 2.6 x 10 Exp. 11 dynes/sq.cm and its density is 2,000,000 dynes. 

Suppose the radius is measured to be r=6.0cm+-0.1cm

a,the true value of the radius lies between _

b,what is the significant figure of area

One sometimes speaks of the “direction of time”, evolving from past to future. Does this mean that time is a vector quantity

Three resistors are used in an electric saw. Each resistor has a resistance of 100 Ω each.

Two of the resistors are connected parallel to each other. A third is connected in series

with the other two. A current of 0.2 A flows through a resistor in one branch of the

parallel resistors. Calculate total parallel resistance

Differences between electric shock versus spark?

. The temperature of an ideal gas increases from 20 ̊C to 40 ̊C while the pressure stays the same. What happens to the volume of the gas?

Find the divergence of the following vector feild.

(i) 3xi+(y-3)j+(2-z)

(ii) Zxi+Xyj+Yzk

During the execution of a reversible nonflow process where the volume changes 

from an initial volume is 0.845 m3

to a final volume of 0.28 m2

and the pressure varies 

as p = -730V + 690 kPaa, where V is in m3

. Determine the work done

Steam flows through an adiabatic turbine at the rate of 100 lb/min with KE = 0

and Q = 0. At entry , its pressure is 175 psia , its volume is 3.16 ft3

/ lb and its internal

energy is 1166.7 BTU / lb. At the exit, its pressure is 0.813 psia, its volume is 328 ft3

/lb

and its internal energy is 854.6 BTU / lb. What horsepower is developed