Electromagnetic waves are waves which can travel through the vacuum of outer space.
Answer:
A). 28 
at 25 cycles per second
B). 100 kJ
C). 6500s or 180.3 minutes or 1.8 hr
Explanation:
Four-cylinder= 280J cycleper cylinder
Efficiency =28%
A).
W=28
B).
The efficiency is 28% and have a work of 28k0J
so:
If 20kJ⇒28%
xkJ ⇒ 100%
Total heat is 100kJ
C).
130MJ per gallon
Liquids have definite volume and indefinite shape.
Answer:
Explanation:
The steam was earlier at 300 ° C. and pressure of 1 MPa. When the gas is allowed to expand against vacuum , work done by the gas is nil because there is no external pressure against which it has to work . Therefore there will not be any change in its internal energy. Since the tank is insulated therefore there is no possibility of external heat to increase its internal energy.
Hence the temperature of gas will remain unaffected. It will remain stagnant at 300
