Given:
Water, 2 kilograms
T1 = 20 degrees Celsius, T2 = 100
degrees Celsius.
Required:
Heat produced
Solution:
Q (heat) = nRT = nR(T2 = T1)
Q (heat) = 2 kilograms (4.184 kiloJoules
per kilogram Celsius) (100 degrees Celsius – 20 degrees Celsius)
<u>Q (heat) = 669.42 Joules
</u>This is the amount of heat
produced in boiling 2 kg of water.
Answer:
Explanation:
Message will travel through the fibre at the speed of 3 x 10⁸ m /s which is also the speed of light .
a ) Time for a message to travel from US to France by using glass fibre link
time = distance / speed
= 6000 x 1000 / 3 x 10⁸
= .02 s .
b )
22000 miles = 1.6 x 22000
= 35200 km
Time for a message to travel from US to France by using a satellite link
time = distance / velocity
distance = 2 x √ ( 35200² + 3000² )
= 2 x 35327 km
= .7 x 10⁸ m .
time = .7 x 10⁸ / 3 x 10⁸
= .233 s
c )
Difference of time = .233 - .02
= .213 which is more than 1/6 s for which effect of hearing stays in the brain , which is called persistence of vision . So they will be heard as different sounds.
<h2>A practical machine cannot be 100% efficient? </h2>
- IF THE CHOICES ARE TRUE OR FALSE THEN U GO
- The answer is false a machine cannot be 100 percent efficient because the output of a machine is always less than input. (correct me if I’m wrong)
<h2>
Have a great day<3</h2>
5.438 to the nearest tenth is 5.4