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3 years ago

What do we call the condition of the atmosphere at a certain time and place?

Physics

1 answer:

Sphinxa [80]3 years ago

8 0

Answer:

Weather

Weather describes what the atmosphere is like at a specific time and place, and may include temperature, wind, and precipitation. Weather is the change we experience from day to day. Climate is the long-term average of weather in a particular spot.

Explanation:

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A crate of books is to be put on a truck with the help of some planks sloping up at 36◦ . The mass of the crate is 80 kg, and th

Dafna11 [192]

Answer:

F= 2.86KN

Explanation:

The attached diagram shows the motion of crate on a single line The forces acting on it have been resolved as shown in the attached figure.The kinetic friction opposes the motion.Now crate is moving with constant speed so the acceleration is constant.

Applying Newton's second law to determine the force F and also substituting the values for $F_{k}$ to eliminate normal force

$$\sum_$ F = ma

Now $a_{x}$ and $a_{y}$ components are zero

Horizontal and vertical forces are Force on crate, weight of crate and kinetic friction

$$\sum F_{x} = Fcos\theta-f_{k}-mgsin\theta=0$

$$\sum F_{y} = F_{n}- Fsin\theta-mgcos\theta=0$

therefore $f_{k} = \mu_{k} F_{n}$

$Fcos\theta- \mu_{k} F_{n}-mgsin\theta=0$ >>> (1)

$F_{n}=Fsin\theta+mgcos\theta$

By putting the above equation in equation 1 we get F

$F=\frac{mg(sin\theta+\mu_{k}cos\theta) }{cos\theta-\mu_{k}sin\theta }$

By putting values we get

F = $\frac{(80kg)(9.81\frac{m}{s^{2} })(sin36+(0.8)cos36) }{cos36-(0.8)sin36}$

F= 2860.8 N

F= 2.86KN

4 0

4 years ago

Is a 3D parallel flow necessarily irrotational?

satela [25.4K]

Answer:

Explanation:

We know that

Rationality in 3D flow is given as follows

$\omega =\omega _xi+\omega _yj+\omega _zk$

If ω is equal to zero then flow will be irrotational and if ω is not equal to zero then flow will be rotational .

So if flow is ir-rotational it means that the component of ω in x-direction,in y-direction and in z-direction direction should be zero.

So it is not necessarily that 3D parallel flow will be irrotaional.

3 0

3 years ago

The gamma photons created during a PET scan are detected when they encounter a scintillator and produce a burst of light. This l

Dafna1 [17]

The minimum frequency to extract an electron is D) $1.14\cdot 10^{15} Hz$

Explanation:

The equation for the photoelectric effect is:

$hf = \phi + K_{max}$

where

(hf) is the energy of the incident photon, where

$h=4.14\cdot 10^{-15} eV\cdot s$ is the Planck constant

f is the photon frequency

$\phi$ is the work function of the material

$K_{max}$ is the maximum kinetic energy of the ejected electron

The minimum frequency of the light needed to extract an electron fro mthe surface of the material can be found by requiring that the maximum kinetic energy of the photoelectron is zero:

$K_{max}=0$

So we get

$hf=\phi$

For silver, the work function is

$\phi = 4.7 eV$

Solving for f, we find the minimum frequency:

$f=\frac{\phi}{h}=\frac{4.7}{4.14\cdot 10^{-15}}=1.1\cdot 10^{15} Hz$

Learn more about photoelectric effect:

brainly.com/question/10015690

#LearnwithBrainly

6 0

3 years ago

A higher albedo means there will be

lozanna [386]

Albedo is how much sunlight reflects off the surface of the Earth. More albedo could mean a number of things. Higher temps, more photochemical smog, it all depends on where the albedo is occurring.

8 0

3 years ago

The first PCS technology used a form of time division multiplexing called ____. a. Time Division Multiple Access (TDMA) b. Gl

salantis [7]

Answer:

A. Time Division multiple Access (TDMA)

Explanation:

Time-division multiple access (TDMA) is a channel access method for shared-medium networks

It allows several users to share the same frequency channel by dividing the signal into different time slots. The users transmit in rapid succession, one after the other, each using its own time slot.

3 0

3 years ago