A glass worker needs to heat 5.0 kg of glass from room temperature (20 ℃) to 900 ℃. If the specific heat of the glass is 840 Jkg ℃, how much heat must be transferred to the glass?

two charges are fixed in place on the x-axis as shown. the charge at x = 0 is negative and has magnitude q = 2 μcoulombs (1 μcoulomb = 10-6 coulombs). the charge at x = d, (d = +12 cm), is positive and has magnitude q = 4 μcoulombs. find a point x = xo along the x-axis at which the electric field is zero.

asthenosphere and convection

this is poiselle's equation from fluid mechanic in physics. mech eng