-- the little ball going round and round a spinning roulette wheel
-- a car driving around a curve in the road at a constant speed
-- any Earth satellite in a perfectly circular orbit.
The closest thing to it is a geostationary TV satellite ... they try hard
to make those orbits perfectly circular, and keep correcting them to
stay circular.
An educated guess is a “hypothesis”
Answer:
1300 m/s
Explanation:
Applying,
v = λf/2............... Equation 1
Where v = velocity or speed of wave, f = frequency of wave, λ = wavelength of wave.
From the question,
Given: f = 325 Hz, λ = (12×2/3) = 8 m
Substitute these values into equation 2
v = 325(8)/2
v = 1300 m/s.
Hence the standing wave speed is 1300 m/s
The right option is 1300 m/s
Answer:
Explanation:
Given that:
thickness of the metal strip, 
width of the metal strip, 
magnitude of the perpendicular magnetic field, 
current through the strip, 
charge density, 
Hall voltage is a transverse voltage given by:
putting the respective values
Note:
V = E d is used when a charge is moved in a uniform electric field between the two oppositely charged plates, it can't be used here because it is the case of Hall effect where the small voltage develops transverse to the direction of current flow.
$0.080 per kWh
25W porch light
a day = 24hrs
365 days in a year = 8760hrs
1) convert 25W to kW
0.025kW in the porch light
2) kW in a year
0.025kW × 8760hrs = 219 kWh in a whole year
3) money
$0.080 × 219kWh = $17.52
