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11Alexandr11 [23.1K]
3 years ago
14

(02.06)plz help me 20 points ​

Physics
1 answer:
Flura [38]3 years ago
5 0

Answer:

the answer is 80 degrees

Explanation:

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Can somebody please explain how a compass can be used to find North?
Ira Lisetskai [31]

if the pointy thingy in your compass is pointing north, that means it's being (pulled toward) something near Earth's north pole

5 0
3 years ago
Air in the amount of 2 lbm is contained in a well-insulated, rigid vessel equipped with a stirring paddle wheel. The initial sta
vladimir1956 [14]

Explanation:

It is known that energy balance relation is as follows.

           \Delta E_{system} = E_{in} - E_{out}

Also,   W_{in} = \Delta U

so,       W_{in} = mC_{v}(T_{2} - T_{1})  

According to the ideal gas equation,

           T_{2} = T_{1} \frac{P_{2}}{P_{1}}

Putting the values into the above equation as follows.

             T_{2} = T_{1} \frac{P_{2}}{P_{1}}

                         = (520R) \frac{40psia}{30psia}

                         = 693.3 R

Now, we will convert the temperature into degree Fahrenheit as follows.

            693.3 - 458.67

          = 234.63^{o}F

From table A-2E_{a}

 C_{p} = 0.240 Btu/lbm R  and   C_{v} = 0.171 Btu/lbm

Now, we will substitute the energy balance as follows.

            W_{in} = mC_{v}(T_{2} - T_{1})  

                         = 2 lbm \times 0.171 Btu/lbm R (693.3 - 520)

                         = 59.3 Btu

Thus, we can conclude that final temperature of air is 59.3 Btu.

6 0
4 years ago
What is the speed of sound in dry air if the temperature is 46°C?
maria [59]
The speed of sound at 46 C is 800.91 mph
7 0
3 years ago
these are the sierra nevada mountains.ice wedging is one of the ways these mountains where weathered.please help
kramer

Answer:

D

Explanation:

7 0
3 years ago
Read 2 more answers
A wind blows at 100 km / h from the east. An aircraft points due north and sets off. In still air its speed is 150 km / h. What
goldenfox [79]

Answer:

180.28 km/h

Explanation:

Let north and south represent the positive and negative y axis and east and west represent the positive and negative x axis.

Given;

Velocity of wind vx= 100 km/s

Velocity of aircraft in still air vy = 150 km/s

The resultant velocity Vr is;

Vr = √(vx^2 + vy^2)

Vr = √(100^2 + 150^2)

Vr = 180.2775637731 km/h

Vr = 180.28 km/h

4 0
3 years ago
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