Answer:
Q = 425 kJ
Explanation:
Given that,
Mass, m = 25 kg
The clown doll head that heats up from 25°C to 35°C
The specific heat is 1700 J/kg°C
We need to find the internal energy of it. The heat required to raise the temperature is given by the formula as follows :
So, 425 kJ of thermal energy is severed.
Answer:
Option A
,
Explanation:
When the ball its thrown up, at half way of its flight it means half of its vertical height which is .
potential energy = mgh
since it moved half way of height
P.E =
This means for the body to have gained half of its P.E, it will loose half of its kinetic energy.
Final kinetic energy() = E/2
kinetic energy =
let the final velocity at halfway flight be v1
= E/2
=
cross multiply we have
=
cancel m from both sides
=
take the square root of both sides,
Thus our final velocities will be E/2 and