What is the electric force acting between two charges of 0.0042 c and −0.0050 c that are 0.0030 m apart?

a. −2.1 1010 n
b. 2.1 1010 n
c. 6.3 107 n
d. −6.3 107 n

Akg a of 55 m at an of 11 ? . if is at 98 km/h,be ?

Air is to be preheated by hot exhaust gases in a cross-flow heat exchanger before it enters the furnace. air enters the heat exchanger at 95 kpa and 20°c at a rate of 0.6 m^3/s. the combustion gases (cp = 1.10 kj/kg°c) enter at 160°c at a rate of 0.95 kg/s and leave at 95°c. determine the rate of heat transfer to the air and its outlet temperature.

In a system with only a single force acting upon a body, what is the relationship between the change in kinetic energy and the work done by the force? answers: work is equal to the change in kinetic energy.work depends on the square of the change in potential energy.work is equal to the negative of the change in kinetic energy.work is equal to the square of the change in kinetic energy