Answer:
Explanation:
Let F be the force applied by Ricardo
work done by him = force x displacement
= F x 54 unit
output of work
= mgh , m is mass of luggage , h is height by which luggage is lifted .
= 645 x 32 x 4.5
= 92880 ft-poundal.
According to question
output / input = .95
92880 / (F x 54) = .95
F = 1810.52 poundal.
If I'm correct if you pluck the center of the string creating a pulse off both directions and would be reflected off the ends of the string my calculations would be 10.37sec
The correct answer of the question is : 0.001 s.
CALCULATION:
As per the question, the speed of sound v = 330 m/s
The frequency of the sound f = 990 Hz.
Let the wavelength of the wave is .
The wavelength of the wave is calculated as-
wavelength
=
= 0.33 m.
Now we are asked to calculate the time period.
The time period of the wave is reciprocal of frequency.
Mathematically time period T =
=
= 0.001 s.
As per the question, we need the period.
Hence, the period of the wave is 0.001 s.
There's not enough information to find an answer.
I think the idea here is that in descending (416 - 278) = 138 meters,
the glider gives up some gravitational potential energy, which
becomes kinetic energy at the lower altitude. This is all well and
good, but we can't calculate the difference in potential energy
without knowing the mass of the glider.
Answer:
Explanation:
- distance travelled by the sound,
- speed of sound in air,
- difference of time time between the two pulses of sound,
<em>Now, we find the time taken by the sound in air to travel the given distance:</em>
∴<u>Time taken by the sound sound waves in the metal bar to travel the given distance:</u>
<u>The speed of sound in the metallic bar:</u>