It’s good how about you brother and sister
Answer:
t' = 458.26 μs
Explanation:
given,
distance traveled by the cosmic ray = 60 Km
time = 500 μs
time taken for the journey according to cosmic ray = ?
now,
v = 1.2 x 10⁸ m/s
according to time dilation formula
t' = 500 x 0.9165
t' = 458.26 μs
-- <em>Mechanical waves DO</em> require a medium in order to travel from place to place. (Sound can't travel without some material to travel through on the way.)
-- <em>Electromagnetic waves do NOT</em> need a medium in order to travel from place to place. (Sunlight reaches us from the Sun without anything to travel through on the way.)
<span><u><em>Answer:</em></u>
205 Joules of energy must be removed from the food
<u><em>Explanation:</em></u>
<u>The first law of thermodynamics states that:</u>
"The change in the internal energy of a closed system must be equal to the heat supplied to the system"
This law is actually a rephrasing of the law of conservation of energy which simply states that : "energy can neither be created nor destroyed, but can change from one form to another".
Now, in the given, we know that 205 J of energy were released from the system, this means that <u>the change in the internal energy of the system was also 205 J.</u>
<u>In other words:</u>
amount of energy removed from food = amount of energy released to the room
Therefore, the amount of energy removed from the food is 205 J.
Hope this helps :)</span>
Radiation, convection, conduction, efficiency
