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yuradex [85]
3 years ago
7

A kayaker needs to paddle north across a 85 m wide harbor. The tide is going out, creating a tidal current that flows to the eas

t at 2.0 m/s. The kayaker can paddle with a speed of 3.4 m/s.
(a) In which direction should he paddle in order to travel straight across the harbor?

(b) How long will it take him to cross?
Physics
1 answer:
marshall27 [118]3 years ago
8 0

Answer:

Explanation:

Let the direction in which he peddles makes an angle of θ with north across

Sinθ = 2 / 3.4

θ = 36 degree ( west of north )

b )

component of his velocity along the north = 3.4 cos 36

= 2.75 m /s

time required = 85 / 2.75 s

= 31 s

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You said that she's losing 1.9 m/s of her speed every second.

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Scientists have changed the model of the atom as they have gathered new evidence. One of the atomic models is shown below. Overl
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Answer:

A). A few of the positive particles aimed at a gold foil seemed to bounce back off of the thin metallic foil.

Explanation:

Scientists decided to change the model of the atom when they discovered new evidence that showed 'few of the positive particles aimed at a gold foil seemed to bounce back off of the thin metallic foil.' On this ground, <u>Rutherford concluded that atom is mostly made up of empty space and thus, he proposed a nucleus model of atom in which the atom comprises of the tiny and positively charged nucleus is surrounded by electrons with a negative charge</u>. Thus, <u>option A</u> is the correct answer.

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6 0
3 years ago
A disk-shaped merry-go-round of radius 2.63 m and mass 152 kg rotates freely with an angular speed of 0.526 rev/s. A 51.7 kg per
zalisa [80]

 Explanation:

Given

radiusr=2.63 m

N=0.526 rev/s

\omega =3.30 rad/s

mass disc  M=152 kg

mass of person  m=51.7 kg

velocity of Person  v=2.76 m/s

moment of inertia  I=Mr^2

I=0.5\times 152\times 2.63^2=827.64 kg-m^2

Initial angular momentum

L_i=I\omega +mvr

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Final Moment inertia

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I_f=(152\cdot 0.5+51.7)\cdot (2.63)^2=1185.243 kg-m^2

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L_f=I_f\omega _f

Conserving angular momentum

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\omega _f=2.62 rad/s

4 0
3 years ago
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