Physics, 22.08.2019 14:30, Becky323

Complete the analogy below. compared to cooler air, hotter air can hold water.
a. less
b. more
c. the same amount of

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Hotter air can hold more water than cooler air. Suppose that you have liquid water in a boiler. Half of it is liquid and the other half is gas. They are in equilibrium. If you heat the liquid water, the molecules in the liquid water tend to separate from its neighboring molecules and go into the gaseous phase of water. The liquid in water has higher pressure and greater volume. More molecules of liquid water will enter into the gaseous phase. There will now be more molecules of water in the hotter air because it has greater volume (the distances between the particles is high) and faster molecules tend to go in the gas. Also, its kinetic energy is high due to the increase in temperature. However, when it is in colder air, the kinetic energy of the molecules is low because the temperature is low.

answered: Guest

find the surface area of the sphere to the nearest square unit. use a calculator.

a. 254 in.2

b. 64 in.2

c. 127 in.2

d. 1,018 in.2

answered: Guest

force is based upon mass and acceleration.the statement is not always true.

it can be explained from newton's second law of motion.

as per newton's second law of motion the rate of change of momentum is directly proportional to the applied force and takes place along the direction of force.

mathematically it can be written as -

$f\alpha \frac{dp}{dt}$

⇒ $f= k \frac{dp}{dt}$

here k is the proportionality constant whose value is 1.

$f=\frac{dp}{dt}$

$f= \frac{d[mv]}{dt}$

$f= m\frac{dv}{dt} +v\frac{dm}{dt}$

$f=ma+v\frac{dm}{dt}$ [a is the acceleration=dv/dt]

hence we see that force not only depends on mass and acceleration but also on velocity and rate of change of mass. force f will depend on mass and acceleration only when mass is constant.

hence the statement that force is based upon mass and acceleration is false.