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stiks02 [169]
3 years ago
5

An airplane is heading due east. The airspeed indicator shows that the plane is moving at a speed of 370 km/h relative to the ai

r. If the wind is blowing from the north at 92.5 km/h, the velocity of the airplane relative to the ground is?
Physics
1 answer:
PolarNik [594]3 years ago
5 0

Answer:

Vp = 358.3m/s

Explanation:

Taking

North: UP

South: DOWN

East: RIGHT

West: LEFT

In the attachment, the velocity vector triangle is shown for the scenario. the triangle formed is a right angled triangle.

We can apply the Pythagora's Theorem.

370 ^ 2 = 92.5^2 + Vp^2    (Vp: plane velocity relative to ground)

Vp = sqr.rt(370^2 - 92.5^2)

Vp = 358.3m/s

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A 1200 kg car traveling at 60 mph quickly brakes to a halt. The kinetic energy of the car is converted to thermal energy of the
ololo11 [35]

Answer:

 ΔT = 59.9 ° C

Explanation:

For this exercise the brake energy is totally converted into heat

Let's calculate the vehicle energy

       K = ½ m v²

Let's reduce the units to the SI system

       v = 30 mph (1609.34 m / mile) (1h / 3600s) = 13.41 m / s

      Em = K = ½ 1200 13.41²

      K = 1.079 105 J

All this energy is transformed into heat

     Em = Q

The expression for heat is

     Q = m  c_{e} ΔT

     ΔT = Q / m c_{e}

The specific heat of iron is c_{e} = 450 J / Kg ºC

     ΔT = 1,079 105 / (4.0 450)

     ΔT = 59.9 ° C

8 0
4 years ago
Read 2 more answers
What keeps the hydrogen atoms together in the molecule ?
blagie [28]
The bonds that hold atoms together to form molecules are called covalent bonds. They are pretty tough and not easily made or broken apart. It takes energy to make the bonds and energy is released when the bonds are broken.
7 0
3 years ago
You can speed up a chemical reaction by using a recyclable substance called areactant
Vilka [71]
The answer is True. You can speed up chemical reactions by using a recyclable substance called a reactant.










5 0
3 years ago
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The age of the universe in seconds
Marianna [84]

Answer:

4.351968e+17 seconds

Explanation:

So I googled age of the universe and it says 13.8 billion years.

you'll have to do some conversions:

in one year, there are 365 days. in one day, there are 24 hours. in one hour, there are 3600 seconds.

\frac{1 year}{365 days} x \frac{1 day}{24 hours} x \frac{1 hour}{3600 seconds}

so you have to add in the current age of the universe to that equation:

\frac{x seconds}{13.8 bil years} x \frac{1 year}{365 days} x \frac{1 day}{24 hours} x \frac{1 hour}{3600 seconds}

arranged so that the proper "units" will read as "x seconds" at the end of the equation.

then you do the math to find x:

13.8 billion x 365 x 24 x 3600 = 4.351968e+17 seconds.

which would be 435,196,800,000,000,000 seconds

Hope this helps :)

7 0
4 years ago
Two carts, cart AA (mass 4.00 kgkg) and cart BB (mass 6.50 kgkg) move on a frictionless, horizontal track. Initially, cart BB is
tankabanditka [31]

Answer:

V{_a}'=-0.95m/s

Explanation:

From the question we are told that:

Mass of cart A m_a=4kg

Mass of cart B m_a=6.50kg

Speed of cart AA V-{a}=4.00

Generally the equation for velocity of  A after collision V{_a}' is mathematically given by

V_{a}'=\frac{M_a-M_b}{M_a+M+b} V_a

V{_a}'=\frac{4-6.5}{4+M6.5} *4

V{_a}'=\frac{4-6.5}{4+M6.5} *4

V{_a}'=-0.95m/s

3 0
3 years ago
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