A1500 w portable heater is needed to replace the heat lost through a circular window (radius 25 cm) in the wall of a home that is made of a single pane of glass 0.30 cm thick. thermal conductivity for the glass is 0.63 w/mk. the temperature inside the house is 20°c and outside is -12°c. what is the thickness of the window?

The thickness of the window pane is 2.94 mm

Solution:

As per the question:

Power of the heater, P = 1500 W

Thickness of the glass pane, t = 0.30 cm =

Radius, R = 25 cm = 0.25 m

Thermal Conductivity of glass, K = 0.63 W/ mK

Inside Temperature,

Outside Temperature,

Now,

Power of the heater = Heat Loss, Q

Thus

Q = 1500 W

We know that:

t' = 2.94 mm

the following is queen elizabeth’s purposes:

- to encourage the parliament that the technique of picking successors to the seat based merely on birthright needs to be reviewed.

- (not) to convince the parliament that her kid should not be measured as a likely choice for heir to the english power.

- to persuade the parliament that merely since she has a child does not assure that the kid will be a capable leader.

- to sway the parliament how shattering it could be if they proceeded discourteously concerning her or her child.

according to jean piaget, in what stage of cognitive development are children able to understand conservation task?

b. preoperational

just took it