Answer: The angular magnification M = 2.1
Explanation:
If the jeweler holds the diamond at the focal point of the magnifying glass, its image will be produced infinitely far away.
This gives an angular magnification of M = N/f
Since the diamond is held 5.68 cm from the magnifying glass,
Then, M = (N - 5.68)/f
Where N = 22.0 cm and f = 7.7 cm
M = (22 - 5.68)/7.7
M = 2.1
Answer:
0.6048 kg of coal
Explanation:
Mass energy input = mass energy output/efficiency
Mass energy output = 30 GJ/ton= 3×10^10 J/1000 kg = 3×10^7 J/kg
Efficiency = 30% = 0.3
Mass energy input = 3×10^7/0.3 = 1×10^8 J
Mass of coal to be burned = power×time/mass energy input
Power = 100 W
Time = 1 week = 604,800 s
Mass of coal to be burned = 100×604,800/1×10^8 = 0.6048 kg
As distance increases, the amount of force needed decreases.
Answer:
air is the answer to the question
