Answer:
C
Explanation:
Q=mcΔθ
Q=quantity of heat , m= mass of the storage rock
Δθ= temperature change.
m= Q/(cΔθ)
Q=5.4
Δθ=62°C-20°C
=42°C
c=0.21cal/g.°C
m≈6100000g
m≈6100kg
Answer:
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Explanation:
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Answer: When the electric field due to one is a maximum, the electric field due to the other is also a maximum, and this relation is maintained as time passes. They alternatively reinforce and cancel each other.
Explanation:
In a wave, the phase, is an arbitrary time reference, used to locate a given point of the wave in time, within a cycle.
Two waves can travel at the same speed, or even have the same wavelength, but this is not enough to be sure that at a given point in time, both waves will be in their maximum, as it only can be determined from the phase of the waves.
So, only when the waves reach at the same point in time at the same amplitude, we can say that they arrive in phase, in a constructive interference.
Answer:
ω = 630.2663 = 630[rad/s]
Explanation:
Solution:
- We can tackle this question by simple direct proportion relation between angular speed for the disk to rotate a cycle that constitutes 20 holes. We will use direct relation with number of holes per cycle to compute the revolution per seconds i.e frequency of speed f.
1rev(20 hole) -> 20(cycle)/rev
2006.2(cycle) -> f ?
f = 2006.2/20 = 100.31rev at second
- The relation between angular frequency and angular speed is given by:
ω = 2πf
ω = 2*3.14*100.31
ω = 630.2663 = 630[rad/s]
Answer:6.66 kPa
Explanation:
Given
Absolute pressure is 50 mm of Hg
atmospheric pressure=80 kPa
we know that
Absolute Pressure=Gauge pressure+vacuum Pressure
50 mm of Hg is equivalent to 6.66 kPa
Thus
Absolute Pressure is 6.66 kPa
or it can be said that it is 73.34 kPa vacuum pressure
