Answer:
a) 361.7 Hz
b) 318.1 Hz
c) 29.3 m/s
Explanation:
a) Speed of sound in 20 degrees celcius is 343 m/s.
Use v=wavelength*frequency to find wavelength.
343=wavelength*340
wavelegth=1.009 meters
Relative speed of waves to observer A = 343+22 = 365 m/s
Plug it back in.
365=1.009*F
F=361.7 Hz
b) Relative speed of waves to observer B = 343-22 = 321 m/s
Plug it back in.
321=1.009*F
F=318.1 Hz
c) STATIONARY CAR, so 369Hz=v/1.009. v=372.3, 372.3-343=29.3m/s!
Answer:
2.398
Explanation:
In order to solve this problem we are required to use the following information and the question expects us to give depth at which theask is seen.
Dn = D x nobservation/n object
This is the formula for apparent depth
Depth = 3.19
The index of refraction for water is 1.33
3.19x1/1.33
= 3.19/1.33
= 2.398m
the person see his dive mask at
2.398m (apparent depth in meters
Explanation:
Given data
The elevator mass=3.0×10³ kg
Time t=23 s
elevator lift d=210 m
The power is the average rate of work done:
So
P=F.V Cosα
Where F is force
V is velocity
α is angle between Force and velocity
Apply the Newton Law to find the force on elevator
![F=mg\\F=(3.0*10^{3}kg )(9.8m/s^{2} )\\F=29400N](https://tex.z-dn.net/?f=F%3Dmg%5C%5CF%3D%283.0%2A10%5E%7B3%7Dkg%20%29%289.8m%2Fs%5E%7B2%7D%20%29%5C%5CF%3D29400N)
The velocity of elevator is given as
![v=d/t\\v=(210m)/23s\\v=9.13m/s](https://tex.z-dn.net/?f=v%3Dd%2Ft%5C%5Cv%3D%28210m%29%2F23s%5C%5Cv%3D9.13m%2Fs)
Since the net force has same direction of motion so α=0°
So
Rhodium is the correct answer
Answer:
science
Are rocks considered valuable natural resources?(1 point)
No, rocks are not valuable because they contain a lot of waste.
No, rocks are not valuable because they are nonliving solids.
Yes, rocks are valuable because they are useful to people.
Yes, rocks are valuable because they are part of Earth’s crust.
Aluminum is produced from bauxite ore and can be used for many things. Which option describes a common production use of aluminum?(1 point)
steel objects
electrical wiring and pipes
fuel for nuclear power plants
lightweight containers and drugs
What are common uses of the mineral quartz?(1 point)
building and paving materials
glass manufacturing and paints
automobile manufacturing and packaging
iron and steel production
Bornite is which type of ore?(1 point)
copper ore
iron ore
bauxite ore
uraninite ore