Answer:
a, c
Explanation:
As the problem statement tells you, the phasor technique cannot be used when the frequencies are different. The frequencies are different when the coefficients of t are different. The different ones are highlighted.
a. 45 sin(2500t – 50°) + 20 cos(1500t +20°)
b. 25 cos(50t + 160°) + 15 cos(50t +70°)
c. 100 cos(500t +40°) + 50 sin(500t – 120°) – 120 cos(500t + 60°) -100 sin(10,000t +90°) + 40 sin(10, 100t – 80°) + 80 cos(10,000t)
d. 75 cos(8t+40°) + 75 sin(8t+10°) – 75 cos(8t + 160°)
Answer:
1170 km/hr
Explanation:
Let's first state the formula to be used
c = √(KRT)
The temperature at an altitude of 15km is -56.5° C
Let's not convert this to °K, we have
-56.5° + 273.15 = 216.65° K
Also, the temperature at 8km is -36.9° C, on converting to °K we have
-36.9° + 273.15 = 236.25° K
Then again, we look for the speed at both 15 km and 8 km both of which are 295 m/s and 308 km
Finally, we use the mach similarity formula
(V/c) of 15km = (V/c) of 8km
V of 8km = c of 8km * (V/c) of 15km
V of 8km = 1170 km/hr
Answer:
Yes that's why they made fire extinguishers
Answer:
The minimum particle diameter that is removed at 85% is 1.474 * 10 ^⁻4 meters.
Solution
Given:
Length = 48 m
Width = 12 m
Depth = 3m
Flow rate = 4 m 3 /s
Water density = 10 3 kg/m 3
Dynamic viscosity = 1.30710 -3 N.sec/m
Now,
At the minimum particular diameter it is stated as follows:
The Reynolds number= 0.1
Thus,
0.1 =ρVTD/μ
VT = Dp² ( ρp- ρ) g/ 10μ²
Where
gn = The case/issue of sedimentation
VT = Terminal velocity
So,
0.1 = Dp³ ( ρp- ρ) g/ 10μ²
This becomes,
0.1 = 1000 * dp³ (1100-1000) g 0.1/ 10 *(1.307 * 10 ^⁻3)²
= 3.074 * 10 ^⁻6 = dp³ (.g01 * 10^6)
dp³=3.1343 * 10 ^⁻12
Dp minimum= 1.474 * 10 ^⁻4 meters.
A television transforms electric energy into sound energy and radiant energy.
<h3>What is energy transformation?</h3>
Energy transformations are processes that convert energy from one type into another. Any type of energy use must involve some sort of energy transformation.
Some examples of energy transformations are, A television converts electric energy into sound and light energy. Lightbulbs convert electric energy into light energy. A hair dryer converts electrical energy into thermal and sound energy.
Learn more about Energy transformations here,
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