Answer: Because of the longitudinal motion of the air particles, there are regions in the air where the air particles are compressed together and other regions where the air particles are spread apart. These regions are known as compressions and rarefactions respectively
Explanation:
Answer:
change of momentum does not depend on the mass of the cars, as the force and time are the same all vehicles have the same change of momentum
Explanation:
Let's look for the speed of the car
F = m a
a = F / m
We use kinematics to find lips
v = v₀ + a t
v = v₀ + (F / m) t
The moment is defined by
p = m v
The moment change
Δp = m v - m v₀
Let's replace the speeds in this equation
Δp = m (v₀
+ F / m t) - m v₀
Δp = m v₀ + F t - m v₀
Δp = F t
We see that the change of momentum does not depend on the mass of the cars, as the force and time are the same all vehicles have the same change of momentum
Work done = force * distance
work done = 200 * 20
work done = 4000J
Answer:
VR = ![\frac{Radius of wheel}{Radius of axle}](https://tex.z-dn.net/?f=%5Cfrac%7BRadius%20of%20wheel%7D%7BRadius%20of%20axle%7D)
Explanation:
A machine is a device that can be used to overcome a load by the application of an effort through a pivot. Examples are: pulleys, wedge, screw jack, wheel and axle etc.
The wheel and axle is a simple device that can be used to lift a load through a height. Its velocity ratio (VR) can be determined by:
VR = ![\frac{Radius of wheel}{Radius of axle}](https://tex.z-dn.net/?f=%5Cfrac%7BRadius%20of%20wheel%7D%7BRadius%20of%20axle%7D)
Note that for a practical wheel and axle, the radius of the wheel is greater than the radius of the axle.
Answer:
B -- Cobalt and iron
Explanation:
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