On an average the adult human eyeball weighs 0.25oz or 7.5grams
A. Outside on a summer day, there are less particles that the sound bounces off of (snow and wind absorb the sound)
B. Water, sound travels faster through denser objects. Water has a higher density than air.
C. High air pressure, sound moves faster through matter that is closer together. This can be said because sound can't travel through space. (There is no atmosphere and consistent particles in space for sound to go through)
D. A piece of steel, It's denser than wood and water.
E. 90% nitrogen and 10% helium, nitrogen is denser than helium so it will move faster
Answer:
Explanation:
500 MW = 500 X 10⁶ J / s
If R be the rate of heat supplied and 35 % is the efficiency of conversion
R x .35 = 500 X 10⁶
R = 500 X 10⁶ / .35
= 1428.57 x 10⁶ J / s
b )
Rate of heat going waste
= .65 x 1428.57 x 10⁶
= 928 .57 x 10⁶ J / s
c )
Heat content of coal = 30 x 10⁶ J /kg
1428.57 x 10⁶ J of heat will come from
= 1428.57 x 10⁶ J / 30 x 10⁶ J /kg
= 47.62 kg per second
= 47.62 x 24 x 60 x 60 = 4114368 kg in one day
= 4114368 / 907.185 ton per day
= 4535.31 ton per day
d ) Fuel consumption rate will decrease by 12.5 % if thermal efficiency is increased to 40 % .
A. Negatively charged
B. Positively charged
A) change in ht after 180m = 180 * sin(4-deg.) = 12.56m
net work done by gravity on the cyclist = mass * gravity * height diff.
= 85 * 9.8 * 12.56
= 10470J
= 10.5kJ
B) Kinetic energy = 1/2 * mass * vel.^2 = work done by gravity = 10470J
vel.^2 = 10470 * 2 / 85 = 246.4
vel. = 15.7m/s