Answer:
v = 350 m/s
Explanation:
The speed of sound depends on the temperature of surrounding. The relation between the speed of sound and the temperature is given by :
Where, T is temperature in Celsius
Here, T = 30 degree Celsius
v = 349.3 m/s
or
v = 350 m/s
Therefore, the speed of sound in air at 30 degrees Celsius is 350 m/s.
Answer:
No
Explanation:
All planets are different than others and bigger so that means no
Answer:
0.12 mm ; 140.50 rad/m ; 628.32 rad/sec ; +
Explanation:
Given the wave equation of the form :
y(x, t) = ym sin(kx ± ωt)
Mas per unit length (u) = 5 g/cm = (5÷1000)kg / 0.01m) = 0.005kg/0.01m = 0.5kg/m
Tension, T = 10 N
Amplitude, A = 0.12 mm
Frequency, F = 100 Hz
Comparing with the general wave equation :
y = Asin(kx ± ωt)
A = amplitude = ym = 0.12 mm
2.) k = 2π / λ
Recall :
v = fλ
v = sqrt(T/u) = sqrt(10/0.5) = sqrt(20) = 4.472
λ = v/ f = 4.472 / 100 = 0.04472
Hence,
k = (2 * π) / 0.04472
k = 140.50 rad/m
3.) Angular frequency, ω
ω = 2πf = 2 * 3.14 * 100 = 628.32 rad/sec
4.) sign is +ve
Direction of wave propagation as given is in the negative x axis
Answer:
=> Black colour do not <em>reflect </em><em>the </em><em><u>wavelength </u></em> of light and is a good emitter of heat . This, black is a good <em>absorber</em> <em>of</em> <em>radiation</em>.
1) The kinetic energy of an object is given by:
where m is the object's mass and v its speed.
By using this equation, we find the initial kinetic energy of the skateboarder:
and the final kinetic energy as well:
So, her change in kinetic energy is
2) The work-energy theorem states that the work done to increase the speed of an object is equal to the variation of kinetic energy of the object:
Therefore, the work done by the skateboarder is