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3 years ago

Init. A

Physics

1 answer:

Gekata [30.6K]3 years ago

7 0

Answer:

v = 1/3 m / s = 0.333 m / s

in the direction of the truck

Explanation:

The average speed is defined by the variation of the position between the time spent

v = Δx / Δt

since the position is a vector we must add using vectors, we will assume that the displacement to the right is positive, the total displacement is

Δx = 20 - 15 +20

Δx = 25 m

therefore we calculate

v = 25/75

v = 1/3 m / s = 0.333 m / s

in the direction of the truck

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An airplane pilot sets a compass course due west and maintains a speed of 220 km/h. after flying for a half hour she finds herse

timurjin [86]

The net speed due west is = distance traveled in west / time taken = 120/0.5 = 240 km/h.

so airspeed due west is = net speed - speed of plane = 240-220= 20 km/h.

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the magnitude of the wind velocity = √[(airspeed due south )² + (airspeed due west)²] = √ ( 40^2 + 20^2 ) = 44.72 km/h

the angle of airspeed south of west is tan⁻¹ ( airspeed due south / airspeed due west )= tan⁻¹(40/20)=63.43 degrees.

if wind velocity is 40 km/h due south, her velocity should have 20 km/h component in north.

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the angle north of west is arctan( 40/216.33 ) = 10.47 degrees.

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3 years ago

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The diagram shows how an image is produced by a plane mirror.

nadezda [96]

I had this question on a quiz, it was X.

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Consider light of wavelengths 400 nm (UV), 550 nm (green, visible), and 900 nm (infrared). What is the energy associated with a

allsm [11]

Answer:

Energy of UV light $=4.95\times 10^{-19}j$

Energy of green light $=3.6\times 10^{-19}j$

Energy of infrared light $=2.2\times 10^{-19}j$

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We have given the wavelength of UV light = 400 nm $=400\times 10^{-9}m$ , wavelength of green light = 550 nm and wavelength of infrared = 900 nm

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Energy of the signal is given by $E=h\nu =h\frac{c}{\lambda }$

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Energy of green light $E=\frac{6.6\times 10^{-34}\times3\times 10^8}{550\times 10^{-9}}=3.6\times 10^{-19}j$

Energy of infrared light $E=\frac{6.6\times 10^{-34}\times3\times 10^8}{900\times 10^{-9}}=2.2\times 10^{-19}j$

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3 years ago

a dog pushes against the front door for 3 seconds with a force of 88N. What impulse has the dog applied to the door?

Kruka [31]

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Explanation:

Given parameters:

Force on door = 88N

Time of action = 3s

Unknown:

Impulse on door = ?

Solution:

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Impulse = Force x time

Impulse is related to momentum. Both quantities are the same and are expressed the same way.

Now input the parameters in the equation;

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Romashka-Z-Leto [24]

Answer:

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