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4 years ago

Define instantaneous velocity

Physics

1 answer:

Anon25 [30]4 years ago

3 0

Answer:

<h2><em><u>Instantaneous Velocity. The instantaneous velocity of an object is the limit of the average velocity as the elapsed time approaches zero, or the derivative of x with respect to t: v(t)=ddtx(t). v ( t ) = d d t x ( t ) . Like average velocity, instantaneous velocity is a vector with dimension of length per time.</u></em></h2>

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(a) What is the vapor pressure of water at 20.0ºC ? (b) What percentage of atmospheric pressure does this correspond to? (c) Wha

DENIUS [597]

Answer:

a). Vapour pressure = 2333.141 Pa

b). Percentage of atmospheric pressure = 99 %

c). Percentage of water vapour = 1.4 %

Explanation:

a). From water saturation pressure table,

Vapour pressure of water at 20°C is 17.5 torr

We know, 1 torr = 133.322 Pa

Therefore, 17.5 torr = 2333.141 Pa

Therefore, vapour pressure at 20°C is 2333.141 Pa

b). At 20°C, the pressure at atmospheric unit = 0.0231 atm

= 0.0231 x $10^{5}$ Pa

= 2310 Pa

Therefore, $\frac{2310}{2333.141}$

= 0.99

Therefore percentage of atmospheric pressure = 0.99 x 100

= 99 %

c). We Know

Relative Humidity (Rh)= $\frac{P_{v}}{P_{saturation}}$

where $P_{v}$ is vapour pressure

Rh is given as 100% = 1

∴ 1 = $\frac{P_{v}}{P_{saturation}}$

$P_{v}=P_{saturation}$ = 2333.141 Pa

Now humidity ratio is

$w = \frac{m_{v}}{m_{a}}$ , where $m_{v}$ is mass of vapour

$m_{a}$ is mass of air

$w = 0.622\times \frac{P_{v}}{P_{total}-P_{v}}$

Let the total pressure be $10^{5}$ Pa

$w = 0.622\times \frac{2333.141}{10^{5}-2333.141}$

$w = 0.01485$

Therefore, percentage of water vapour is 0.01485 x 100

= 1.4 %

8 0

3 years ago

in a two-body collision, a. momentum is always conserved. b. kinetic energy is always conserved. c. neither momentum nor kinetic

tatiyna

The answer is neither the momentum nor kinetic energy is conserved

4 0

3 years ago

Read 2 more answers

The maximum amount of pulling force a truck can apply when driving on

DochEvi [55]

Answer:

8760 N

Explanation:

think this is the right answer :)

4 0

3 years ago

DISCUSS THE PROCESS OF MAKING SILAGE.

VARVARA [1.3K]

Answer:

Silage can be made by one or more of the following methods: placing cut green vegetation in a silo or pit; piling the vegetation in a large heap and compressing it down so as to purge as much oxygen as possible, then covering it with a plastic sheet; or by wrapping large round bales tightly in plastic film.

Explanation:

7 0

3 years ago

If a book is knocked off a desk that is .75 m tall at a rate of 2.0 m/s, how far away from the desk does it fall

ANEK [815]

Answer: 0.8 m

Explanation:

In the vertical direction, the speed is zero, u = 0.

Distance covered in the vertical direction, s = 0.75 m.

The book would fall with acceleration due to gravity in the vertical direction, a = g = 9.8 m/s²

From the equation of motion,

s = u t + 0.5 a t²

Substituting the above values, we will find out the time taken for the book to hit the ground.

⇒0.75 m=0+0.5×9.8 m/s²×t²

⇒t = √0.153 = 0.39 s ≈ 0.40 s

Now, the horizontal distance covered,

d = v×t ⇒d= 2.0 m/s × 0.40 s =0.8 m

Hence, the book falls 0.8 m away from the desk.

7 0

3 years ago