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Oksana_A [137]
3 years ago
14

A river is flowing south at a rate of 3 m/s. Steven can roe directly across the river if he aims the raft 30 degrees. What rate

is Steven rowing at
Physics
1 answer:
levacccp [35]3 years ago
3 0

Answer:

Steven has to row at a speed to reach the same horizontal spot at the other side of the river is, V = 6 m/s

Explanation:

Given data,

The river flowing south at the rate, v = 3 m/s

To reach the other side directly across the river, he aims the raft, Ф = 30°

The speed of his raft across the river is given by the formula,

                                          V = v / Sin Ф

                                             = 3 / Sin 30°

                                              = 6 m/s

Steven has to row at a speed to reach the same horizontal spot at the other side of the river is, V = 6 m/s

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A ball is whirled on the end of a string in a horizontal circle of radius R at speed v. By which one of the following means can
Vera_Pavlovna [14]

Explanation:

When an object moves in a circular path, it will have circular acceleration. Its magnitude of acceleration is given by :  

a=\omega^2R

Since, \omega=\dfrac{2\pi }{T}R

a=(\dfrac{2\pi}{T})^2R

T is the time period

R is the radius of the circular path

To increase the centripetal acceleration bu a factor of 1.5 or 3/2, radius of circle must be increase by a factor of 6 and T is increased by a factor of 2 such that,

R'=6R and T'=2T

So,

a'=(\dfrac{2\pi}{T'})^2R'

a'=(\dfrac{2\pi}{(2T)})^2(6R)

a'=\dfrac{6}{4}(\dfrac{2\pi}{T})^2R

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Hence, this is the required solution.

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8 0
3 years ago
A dogsled team has a total momentum of 1710 kg•m/s. If the team has a total mass of 450 kg, what is its speed?
HACTEHA [7]

Answer:

3.8 m/s

Explanation:

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Making v the subject of the formula then

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7 0
3 years ago
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