An insulated thermos contains 140 cm3 of hot coffee at 85.0°c. you put in a 15.0 g ice cube at its melting point to cool the coffee. by how many degrees has your coffee cooled once the ice has melted and equilibrium is reached? treat the coffee as though it were pure water and neglect energy exchanges with the environment. the specific heat of water is 4186 j/kg·k. the latent heat of fusion is 333 kj/kg. the density of water is 1.00 g/cm3.

The ph of your mouth is very similar to that of stomach. true or false?

Aroll in a paper machine is powered by a separately excited dc machine. operating point 1 (under load): the roll typically operates at 764 rpm and must provide 301 nm of torque to oppose the load of the paper. the armature voltage is 230v for this operating point operating point 2 (no load): when the load is removed the speed of the roll increases to 900 rpm (the field characteristics are unchanged) la ea dev m (a) calculate the maximum torque (units of nm) that the motor can supply with this applied voltage (b) calculate the value of the armature resistance, ra (in ohms) (c) at operating point 1 (loaded condition), the field current, i, and the total input power (armature field), are measured to be to be 10 a and 28,600 w respectively. use this information to calculate the value of the field resistance, rf (in ohms). (d) (d) at operating point 1 (loaded condition), calculate the motor efficiency. express your answer as a percent to at least 2 significant digits. (d) if the field voltage is reduced by 1/2, calculate the new stall torque (in nm) of the motor (f). if the field voltage is reduced by 1/2, calculate the new no-load speed (in rad/sec)

Will you chech and finish these for me, because i am stumped with them.