4. A glass vessel contains tungsten balls and is filled with mercury to a certain mark. It is found that the mercury level always remains at this
mark when the glass vessel is heated. What is the ratio of volume of Hg
to that of tungsten at 0°C. (linear expansivity of glass= 8 x 10^-6 /°C , cubical expansivity of mercury
18 x
10^-5 /°C and linear expansivity of tungsten= 4.4 x 10^-6 /°C)

Electroplating is a way to coat a complex metal object with a very thin (and hence inexpensive) layer of a precious metal, such as silver or gold. in essence the metal object is made the cathode of an electrolytic cell in which the precious metal cations are dissolved in aqueous solution. suppose a current of 480.ma is passed through an electroplating cell with an aqueous solution of agno3 in the cathode compartment for 46.0 seconds. calculate the mass of pure silver deposited on a metal object made into the cathode of the cell. round your answer to 3 significant digits. also, be sure your answer contains a unit symbol. ×10μ

Ajet plane has a sound level of 120 db at a distance of 60 m. what is the q23. sound level at a distance of 6.0 km? (60)2 (6000)? om solution 80db db, hint: 16x assume ultrasound waves travel through the body of an animal at 1540 q24. m/s. if a 30,000 hz signal were reflected off a portion of a heart which was moving toward the source at 3 m/s, what frequency signal would return to the stationary source? solution 30.117hz

What is the average speed of a car that travels 40mph for 1 hour and 60 mph in another hour will mark brainliest