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2 years ago

13. An aircraft heads North at 320 km/h rel:

Physics

1 answer:

AURORKA [14]2 years ago

7 0

The velocity of the aircraft relative to the ground is 240 km/h North

Explanation:

We can solve this problem by using vector addition. In fact, the velocity of the aircraft relative to the ground is the (vector) sum between the velocity of the aircraft relative to the air and the velocity of the air relative to the ground.

Mathematically:

$v' = v + v_a$

where

v' is the velocity of the aircraft relative to the ground

v is the velocity of the aircraft relative to the air

$v_a$ is the velocity of the air relative to the ground.

Taking north as positive direction, we have:

v = +320 km/h

$v_a = -80 km/h$ (since the air is moving from North)

Therefore, we find

$v'=+320 + (-80) = +240 km/h$ (north)

Learn more about vector addition:

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Like all planets, the planet Venus orbits the Sun in periodic motion and simultaneously spins about its axis. Just as on Earth,

Liono4ka [1.6K]

Answer:

a) F = 5.14 10⁻⁸ Hz, f = 4.76 10-8 Hz, b) v = 2.29 m / s, f = 42.5 Hz

Explanation:

a)This problem has two parts.

For the calculations relative to the planet Venus, we use that the period and the frequency are related

f = 1 / T

frequency of the orbit around the Sun

Let's reduce the period to the SI system

T = 225 days (24h / 1days) (3600 s / 1h) = 1.94 10⁷ s

F = 1 / 1.94 10⁷

F = 5.14 10⁻⁸ Hz

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T = 243 d = 2.1 107 s

f = 1 / T

f = 1 / 2.1 107

f = 4.76 10-8 Hz

b) give the data of some marine waves

the speed of the wave can be found with kinematics

v = x / t

v = 50.0 / 21.8

v = 2.29 m / s

If the wavelength is L = 9.28m

this distance is the distance between two consecutive ridges or valleys

λ / 2 = L

λ = 2L

λ = 2 9.28

λ = 18.56 m

the speed of the wave is

v = λ f

f = v /λ

f = 2.29 / 18.56

f = 42.5 Hz

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1 year ago

Wind blows at the speed of 30m/s across a 175m^2 flat roof if a house.

Makovka662 [10]

Answer:

the net force is 101587.5 N

Explanation:

The speed of wind

v = 30 m/s

The area of roof,

A = 175 m 2

The expression for the Bernoulli's theorem.

P = 12 ρv 2 ...... (1)

Here,

P is the pressure difference,

ρ is the density of air and

v is the speed of wind.

The expression for the pressure.

P = F A ..... (2)

Here,

F is the force and

A is the area of roof.

Part (a)

Substitute the values for the pressure difference in equation (1)

P = 12 × 1.29 × (30) 2 P = 580.5 Pa

Thus, the pressure difference at the roof between the inside and outside air is

580.5 Pa

Part (b)

Substitute the values for the net force in equation (2)

580.5 = F 175 F = 101587.5 N

Thus, the net force is 101587.5 N.

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2 years ago

Can a small child play with fat child on the seesaw?Explain how?

RoseWind [281]

Yes a small child can play with fat child in the seesaw because if the the load distance is decreased the effort will increase. That's means if the distance between the fat boy and the fulcrum is decreased the small child needs less effort.so,he can play

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1 year ago

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The system shown above consists of two identical blocks that are suspended using four cords, each of a different length. Which o

Mariana [72]

Answer:

Option B and C are True

Note: The attachment below shows the force diagram

Explanation:

The weight of the two blocks acts downwards.

Let the weight of the two blocks be W. Solving for T₁ and T₂;

w = T₁/cos 60° -----(1)