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3 years ago

9

Simple definition of polar vector

2 answers:

Assoli18 [71]3 years ago

5 0

Answer:

In physics, a polar vector is a vector such as the radius vector that reverses sign when the coordinate axes are reversed

Explanation:

Polar vectors are the type of vector usually simply known as "vectors." In contrast, pseudovectors (also called axial vectors) do not reverse sign when the coordinate axes are reversed.

denis-greek [22]3 years ago

3 0

Explanation:

<h2> A polar vector is a vector such as the radius vector that reverses sign when the coordinate axes are reversed. </h2>

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A ball is thrown at an angle of to the ground. If the ball lands 90 m away, what was the initial speed of the ball?

andre [41]

Answer:

The initial speed of the ball is 30 m/s.

Explanation:

It can be assumed that the ball is thrown at an angle of 45 degrees to the ground. The ball lands 90 m away. We need to find the initial speed of the ball. We know that the horizontal distance covered by the projectile is called its range. It is given by :

$R=\dfrac{u^2\ sin2\theta}{g}$

u is the initial speed of the ball.

$v=\sqrt{\dfrac{Rg}{sin2\theta}}$

$v=\sqrt{\dfrac{90\times 9.8}{sin2(45)}}$

v = 29.69 m/s

or

v = 30 m/s

So, the initial speed of the ball is 30 m/s. Hence, this is the required solution.

8 0

4 years ago

5 health benefits of physical activity

N76 [4]

Answer:

reduce your risk of a heart attack.

manage your weight better.

have a lower blood cholesterol level.

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have lower blood pressure.

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5 0

4 years ago

Read 2 more answers

A child slides down a snow‑covered slope on a sled. At the top of the slope, her mother gives her a push to start her off with a

kirill [66]

Answer:

θ = 13.16 °

Explanation:

Lets take mass of child = m

Initial velocity ,u= 1.1 m/s

Final velocity ,v=3.7 m/s

d= 22.5 m

The force due to gravity along the incline plane = m g sinθ

The friction force = (m g)/5

Now from work power energy

We know that

work done by all forces = change in kinetic energy

( m g sinθ - (m g)/5 ) d = 1/2 m v² - 1/2 m u²

(2 g sinθ - ( 2 g)/5 ) d = v² - u²

take g = 10 m/s²

(20 sinθ - ( 20)/5 ) 22.5 = 3.7² - 1.1²

20 sinθ - 4 =12.48/22.5

θ = 13.16 °

5 0

3 years ago

Two oppositely charged objects are separated by a small distance. The objects are then moved three times farther apart from each

stepan [7]

Force is indirectly proportional to the distance. Therefore when the distance increases the force of attraction increases and the answer would be B

7 0

3 years ago

A 2000 Hz siren and a civil defense official are both at rest with respect to the ground. What frequency does the official hear

astra-53 [7]

Answer:

a) $f_1 = 2070.6 Hz$

b) $f_2 = 1929.4 Hz$

Explanation:

Apparent frequency of the siren is given as

$f = \frac{v_{rel}}{\lambda}$

as we know that the wavelength will remain the same as it is having originally

sowe know

$\lambda = \frac{340}{2000}$

$\lambda = 0.17 m$

a) Now when wind is blowing from source to official

so we have

$v_{rel} = 340 + 12 = 352 m/s$

so we have

$f_1 = \frac{352}{0.17}$

$f_1 = 2070.6 Hz$

b) Now when wind is from official to source

so we have

$v_{rel} = 340 - 12 = 328 m/s$

so we have

$f_2 = \frac{328}{0.17}$

$f_2 = 1929.4 Hz$

4 0

4 years ago