Two parallel plates are 4cm apart and have a potential difference of 2.5kV between them . a) Calculate the electric field strength between the plates . b) A small piece of dust carrying a charge of +2.4nC moves into the space between the plates i) Calculate the force on the dust particle . ii) the mass on the dust particle is 4.2 micro grams. Calculate the acceleration of the particle towards the negative plate

Asmall metal bar, whose initial temperature was 10° c, is dropped into a large container of boiling water. how long will it take the bar to reach 70° c if it is known that its temperature increases 2° during the first second? (the boiling temperature for water is 100° c. round your answer to one decimal place.) sec how long will it take the bar to reach 98° c? (round your answer to one decimal place.)

In a system, when potential energy decreases, then entropy also decreases. true false

Which best describes the first law of thermodynamics as compared to the second law of thermodynamics? a. the first law describes how thermal energy is conserved but not the direction it moves. b. the first law describes the direction thermal energy moves but not how it is conserved. c. the first law describes how thermal energy can be created but not how it can be destroyed. d. the first law describes how thermal energy can be destroyed but not how it can be created.