1. How much heat energy is needed to raise the temperature of a S gram piece of
aluminum from 15°C to 30*C if the
specific heat of aluminum is 0.90 J/g*C?

a:

by the combination of an unlimited number of elements

a gas, having a molecular weight of 13 kg/kmol and a kinematic viscosity of 0.25 cm2/s, flows through a pipe 0.25 m internal diameter and 5 km long at the rate of 0.4 m3/s and is delivered at atmospheric pressure.

5.6⋅10−^19  j

do you need the explaination?

weight of any object is given by

w = m*g

where m is mass of the object and g is the acceleration due to gravity.

for earth the value of g is 9.8 m/s^2 so

w=117.6 n m=12 g=?

117.6=12g => g=9.8 m/s^2

which is the force of gravity on earth.