Answer: The correct answer is vacuum.
Explanation:
Sound wave is a longitudinal wave in which the particles vibrate parallel to the direction of the motion of the wave. Sound wave consists of compression and rarefaction.
It needs a medium to travel. It can travel in solid, liquid and gas. It cannot travel in vacuum.
Denser the medium, more will be the speed of the wave.
Solid is more denser in comparison to liquid.
The speed of the sound in the solid medium is more in comparison to the liquid. The speed of the sound in liquid is more than the speed in the gas.
Therefore, vacuum is least effective medium for traveling sound waves.
Answer:
speed of the arrow as it leaves is 41.05 m/sec
Explanation:
We have given mass m = 0.285 kg
Average force F = 182 N
Distance traveled d = 1.32 m
We know that work done = force distance
Sp work done =
Now according to work energy theorem work done will be equal to kinetic energy
So
v = 41.05 m/sec
So speed of the arrow as it leaves is 41.05 m/sec
Explanation:
If both distance and size are proportional to that in the solar system, the model would be essentially useless.
For example, if the sun were represented by a marble 1 cm in diameter, the planet Neptune would be represented by a grain of sand .3 mm in diameter about 32.3 meters (106 ft) away. The largest planet, Jupiter, would be a larger sand grain, 1 mm in diameter, about 5.6 meters from the sun. Earth would be less than 0.1 mm in diameter, about 1 meter away from the sun.
Such a model would barely fit into a gymnasium (basketball court), and the elements of it would be very difficult to find without a map.
Answer:
The magnitude of the recoil is v = 1.95 m/s
Explanation:
The momentum of bullet
P = m*v
P = 0.0077kg x 860m/s
P = 6.622 kg m/s
Now using the law of conservation of momentum we have,
P1 + P2 = 0
Now solve to V2 to find the velocity of the rifle so:
m1*v1 + m2*v2 = 0
3.4kg*v1 + 6.622 kg m/s = 0
3.4 kg*v1= -6.622 kg m/s
v1 = 6.622/3.4
v1 = 1.95 m/s