It is false, the particles of the medium move perpendicular to the way the wave is going.
Answer:
1.4×10⁵ N
Explanation:
Find the acceleration.
Given:
v₀ = -1000 m/s
v = 0 m/s
t = 120 s
Find: a
v = at + v₀
(0 m/s) = a (120 s) + (-1000 m/s)
a = 8.33 m/s²
Find the force.
∑F = ma
F − mg = ma
F = mg + ma
F = m (g + a)
F = (75600 / 9.8) (9.8 + 8.33)
F = 1.4×10⁵ N
Answer:
f = 686N
Explanation:
parameters given ;
mass = 70kg
force = ?
acceleration due to gravity = 9.8m/s²
from the formula for finding force ,
force is equals to mass of an object multiplied by its acceleration due to gravity
i.e
f = ma
f = 70 × 9.8
f = 686N
Therefore the force that she uses to push she pushes on the ground before she stands up is 686NEWTON.
1) The frequency of the sound is
while the speed of sound is
So we can use the relationship between wavelength, speed and frequency of a wave to find the wavelength corresponding to this sound:
2) The wavelength in this case is
while the frequency of the wave is
So we can use the same relationship we used in part 1) to find the speed of the sound wave:
3) The velocity of the wave is
while its wavelength is
therefore we can find its frequency by using the usual relationship:
Bcoz when you place a magnet close enough the magnet attracts or repals without any other fore we dont touch the magnet so it is non contact