In this case, there is a chemical reaction where there is the burning of fuels that can vary between some within the periodic table, but when the fuel is burned a reaction occurs that gives the coloration the explosions of the fires.
Answer:
0.061 J
Explanation:
The kinetic energy of an object is given by

where
m is the mass of the object
v is its speed
For the toy truck in the problem, we have
m = 0.1 kg is its mass
v = 1.1 m/s is its speed
Putting the numbers into the equation, we find

Answer:
Power required will be 7.2 watt
Explanation:
We have given battery of Barble jeep is 6 volt
So potential difference V = 6 volt
Resistance of electric motor R = 5 ohm '
We have to find the power motor using to drive the jeep
Power is given by
, here V is voltage and R is resistance
So 
Answer:(a)10 ft/s
(b)4 ft/s
Explanation:
Given
height of light 
height of man

From diagram



differentiate both sides

Tip of shadow is moving at the rate of

(b)rate at which length of his shadow is changing
Length of shadow is 
differentiating w.r.t time


Efficiency = (useful output) / (input)
Efficiency = (35 J) / (125 J) = 0.28 = 28%