A55-kg box rests on a horizontal surface. the coefficient of static friction between the box and the surface is 0.30. a horizontal 42 n force is applied to the box. what is the static friction force on the box? 1) what is the minimum static friction force?
2) how do you calculate the maximum friction force?
3) if an object is at rest before a force is applied at what point does the object starts moving?

Which is an example of gaining a static charge by conduction? a) rubbing a balloon against your hair. b) shuffling your shoes across a carpet. c) bringing a charged rod near an electroscope. d) touching your car on a cold day and getting a shock.

8.29 two streams containing pyridine and acetic acid at 25°c are mixed and fed into a heat exchanger. due to the heat-of-mixing effect, it is desired to reduce the temperature after mixing to 25°c using a stream of chilled ethylene glycol as indicated in the diagram. calculate the mass flow rate of ethylene glycol needed. the heat capacity of ethylene glycol at these conditions is approximately 2.8 kj/(kg k), and the enthalpy change of mixing (δmixh) is given below.

Ascientist wants to test ways to reduce pollution in lake . what is the bestway of doing this