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Zigmanuir [339]
3 years ago
11

A plane took 7 hours to travel 2020 km. For the first 4 hours,

Physics
2 answers:
kicyunya [14]3 years ago
8 0

Answer:

-6.6 km/h

Explanation:

In 7hr plane travelled 2020km;

For the first 4hr the average speed was 310km/h;

d=st, s=d/t;

Distance covered in first 4h is d = 310km/h×4h = 1240km;

See the image attached for further solution

AURORKA [14]3 years ago
3 0

Answer:

260

Explanation:

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Que relación encontramos entre el modelo atomico de borh y la tabla periódica
mash [69]

Answer:

si

Explanation:

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When mantle rocks near the radioactive core are heated, they become less dense than the cooler, upper mantle rocks. These warmer
avanturin [10]
C.convection cells is the right answer
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Speakers A and B are vibrating in phase. They are directly facing each other, are 6.69 m apart, and are each playing a 75.0-Hz t
maw [93]

Answer:

3.117 m

Explanation:

Given that:

the distance of separation between speaker A and speaker B (L) = 6.69 m

Frequency (F) = 750 -Hz tone

Velocity of speed of sound = 343 m/s

The distance from Speaker A to the first point (L₁) on the line can be calculated by using the formula:

L_1=\frac{L-A}{2}

where A = \frac{Velocity ofthe sound (V)}{Frequency (F)}

we have:

L_1=\frac{L-\frac{V}{F} }{2}

L_1=\frac{6.69-\frac{343}{750} }{2}

L_1=\frac{6.69-0.457 }{2}

L_1=\frac{6.233 }{2}

L_1= 3.1165 m

L_1=3.117 m

∴ the distance from speaker A to the first point on the line between the speakers where constructive interference occurs = 3.117 m

3 0
3 years ago
State Pascal’s law. (2) b) The area of one end of a U-tube is 0.01 m2 and that of the other
Ray Of Light [21]

Answer:

Pascal Law's says that:

If the area of one end of a U-tube is A, and the area of the other end is A'. then if we apply a force F in the first end (the one of area A), the force experienced at the other end must be:

F' = F*(A'/A).

b) Now we can apply this to our particular case:

if the area of one end is 0.01m^2, and the area of the other end is 1m^2

Then we have:

A = 0.01m^2

A' = 1m^2

So, if now we apply a force F in the first end, the force experienced at the other end will be:

F' = F*(1m^2/0.01m^2) = F*100

This means that the force in the other end must be 100 times the force in the first end.

3 0
2 years ago
10. A wave of speed 5000 m/s is traveling with a wavelength of 100 meters. Calculate the period and
tekilochka [14]

Answer:

0.02 sec, 50 Hz

Explanation:

period = 100/5000 = 0.02 sec

frequency = 1/0.02 = 50 Hz

3 0
2 years ago
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