A sample of octane (C8H18) that has a mass of 0.750 g is burned in a bomb calorimeter As a result, the temperature of the
calorimeter increases from 21.0°C to 41.0°C. The specific heat of the calorimeter is 1.50 J/(g • °C), and its mass is 1.00 kg.
How much heat is released during the combustion of this sample?
Use Gum, AT
225 kJ
30.0 kJ
31.5 kJ
615 kJ

water is used to store them because it would keep the radiation from getting out in the open and causing harm to the workers

a: 45.9 meters

b: 4.29 seconds

step-by-step explanation:

a: h(t)=1/2(-9.8)(3)^2+0(3)+90

h(t)=-4.9(3)^2+90

h(t)=-44.1+90

h(t)=45.9 meters

b: 0=1/2(-9.8)(t^2)+0t+90

0=-4.9t^2+90

-90=-4.9t^2

18.37=t^2

t=4.29 seconds

in the second question, the numbers aren't exact, but they're a close approximation.