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AURORKA [14]
3 years ago
9

what kind of weather would u assosiate with higher perssure system? How does the density, humidity and air motion compare to tha

t of low pressure system?
Physics
1 answer:
expeople1 [14]3 years ago
4 0

Answer:

Low pressure systems typically arrive with storms and clouds. Air motion is usually upwards, as heated are is less dense and more buoyant than cooler air. A high pressure system is typically cooler than its counter-part, and skies are usually clear. Low pressure systems carry more water vapor due to rising hot air cooling and condensing.

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If a roller coaster car had 40,000 J of gravitational potential energy when at rest on the top of a hill how much kinetic energy
Inessa [10]

Answer:

K.E = 30,000 J

Explanation:

Given,

The potential energy of the roller coaster car, P.E = 40000 J

The kinetic energy at height h/4, K.E = ?

According to the law of conservation of energy, the total energy of the system is conserved.

At height 'h', the total energy is,

                                    P.E = mgh

                                     K.E = 0

At height 'h/4', the total energy is

                                     P.E + K.E = mgh

                                     P.E = mgh/4

                                     K.E = 1/2 mv²

Therefore,

                                   mgh/4 + 1/2 mv² = mgh

                                    gh/4 + v²/2 = gh

Hence,

                                      v² = 3gh/2

Substituting in the K.E equation

                               K.E = 1/2 mv²

                                      = 1/2 m (3gh/2)

                                       = 3/4 mgh

                                        = 3/4 x 40000

                                         = 30000 J

Hence, the K.E of the roller coaster car is, K.E = 30000 J

6 0
3 years ago
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Paraphin [41]
Metals contain the most and semiconductors contain the least amount. Hope this helps.
3 0
3 years ago
Dan is going swimming to get some exercise.which of the following is appropriate swim safety advice?
victus00 [196]

Answer:

C.

If he is pulled into a current, he should swim toward the shore at a 45-degree angle.

Explanation:

5 0
3 years ago
Which of the following has the lowest density?
AVprozaik [17]

Answer:

show the list of things or a picture so I can answer it

3 0
3 years ago
A lightbulb manufacturer makes bulbs with different "color temperatures," meaning that the spectrum of light they emit is simila
Oksana_A [137]

Answer:

The bulb with higher temperature(4000 K) will be brighter

Explanation:

From the question we are told that

     The color temperature  for first bulb is  T_1 = 2000K

        The color temperature  for second bulb is  T_2 = 4000K

Generally the emission power of black body radiation is mathematically represented as

     E = \sigma T^4

Where  \sigma is the Stefan-Boltzmann constant  with a value \sigma = 5.67 * 10^{-8} W m^{-2} K^{-4.}

Now for T_1 = 2000K

      E_1 = 5.67*10^{-8} * (2000)^4

       E_1 = 907.2 \ W/m^2

At  T_2 = 4000K

       E_2 =  5.67*10^{-8} * 4000

        E_2 =  14515.2 \ KW/m^2

Looking at the result we got we see that  the emission power  for the higher temperature bulb is higher, this means that its power to emit in the visible spectrum range would be higher  

So the bulb with higher temperature will be brighter

       

7 0
3 years ago
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