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☆☆☆☆☆Cards in this guide (9)
How much heat is needed to raise 8 kg of water from 4 degrees Celsius to 83 degrees Celsius
2,641,760J...
Waves with a frequency of 2.0 hertz are generated along a string The waves have a wavelength of 0.50 meters The speed of the waves along the string is
v=f*wavelength v=2*.5 v=1 m/s
A 45 kg skater is skating down a hill on roller blades at a a speed of 10 ms what is the kinetic energy of the skater
2,250 joules
A 120 ohm resistor a 60 ohm resistor and a 40 ohm resistor are connected in parallel to a 120 volt power source What is the effective resistance of the three resistors
Reff = R1*R2 / (R1+R2)
if you follow this for all three, you will end up with 20 ohms.
The speed of sound in water is 1430 ms Find the wavelength of a sound with a frequency of 286 Hz traveling through the water
Formula is velocity=frequency X wavelength
so Wavelength = 5m
Sound travels the slowest through which of these
Air
What is the speed of a sound wave that has a wavelenght of 102 meters and a frequency of 250hz
speed = wavelength * frequency wavelength = 102 meters
frequency = 250 Hz = 250 cycles/second
102 * 250 = 25500 meters/second
As frequency increases the energy of a wave increases or decreases
As frequency increases the energy of a wave also increases.
The lower range of human hearing is approximately Hz.
20, for a+ users
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