At a fabrication plant, a hot metal forging has a mass of 67.2 kg and a specific heat capacity of 438 j/(kg c°). to harden it, the forging is quenched by immersion in 786 kg of oil that has a temperature of 37.1 °c and a specific heat capacity of 2950 j/(kg c°). the final temperature of the oil and forging at thermal equilibrium is 58.3 °c.
assuming that heat flows only between the forging and the oil, determine the initial temperature in degrees celsius of the forging.

Tm = 1,728.38 °C

Explanation:

mass of metal forging (Mm) = 67.2 kg

specific heat capacity of metal forging (Cm) = 438 J/kg°C

initial temperature of metal forging (Tm) = ?

final equilibrium temperature (Te) = 58.3 °C

mass of oil (Mo) = 786 kg

specific heat capacity of oil (Co) = 2950 J/kg°C

temperature of oil (To) = 37.1 °C

Mm × Cf × (Tm - Te) = Mo × Co × (Te - To)

Tm = + Te

Tm = + 58.3

Tm = 1,728.38 °C

the answer is f1 and d2 because if you put equal force on those two points the beam would balance trust me on this

the minimum constant speed at which she can catch the train is 2.7 m/s

given:

acceleration = 0.6

time = 4.5 s

to find:

velocity = ?

formula used:

from 1st kinematic equation we get,

v = u + at

u = initial speed of train = 0 m/s

v = final speed of the train

a = acceleration of the train

t = time

solution:

from 1st kinematic equation we get,

v = u + at

u = initial speed of train = 0 m/s

v = final speed of the train

a = acceleration of the train

t = time

v = 0 + (0.6 × 4.5)

v = 2.7 m/s

the minimum constant speed at which she can catch the train is 2.7 m/s