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3 years ago

Which best describes how the sun rotates?

Physics

2 answers:

fomenos3 years ago

7 0

Answer:

The sun rotates more slowly at its poles.

grandymaker [24]3 years ago

7 0

Answer:

The sun rotates more slowly at its poles.

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The length of an aluminum wire is quadrupled and the radius is doubled. By which factor does the resistance change?

erik [133]

The resistance of a conductive wire is given by:
$R= \frac{\rho L}{A}$
where
$\rho$ is the material resistivity
$L$ is the wire length
$A$ is the cross-sectional area of the wire

The length of the wire is quadrupled, so if we call L the original length and L' the new length, we can write
$L'=4 L$

Similarly, the radius of the wire is doubled (r'=2r), so the new area is
$A'= \pi (r')^2 = \pi (2r)^2 = 4 \pi r^2 = 4A$

And if we substitute into the equation, we find that the new resistance of the wire is
$R'= \frac{\rho L'}{A'}= \frac{\rho (4L)}{4 A'} = \frac{\rho L}{A}=R$
Therefore, R=R': this means that the resistance of the wire did not change.

7 0

2 years ago

A bicyclist was moving at a rate of 8 m/s, and then sped up to 10 m/s. If the cyclist has a mass of 120 kg, how much work was ne

sergeinik [125]

W=∆KE

KE=1/2m∆v^2

=1/2*120*(10-8) ^2

=240j

3 0

3 years ago

Read 2 more answers

At the local playground, a 21-kg child sits on the right end of a horizontal teeter-totter, 1.8 m from the pivot point. On the l

Ksju [112]

Answer:

By convention a negative torque leads to clockwise rotation and a positive torque leads to counterclockwise rotation.

here weight of the child =21kgx9.8m/s2 = 205.8N

the torque exerted by the child Tc = - (1.8)(205.8) = -370.44N-m ,negative sign is inserted because this torque is clockwise and is therefore negative by convention.

torque exerted by adult Ta = 3(151) = 453N , counterclockwise torque.

net torque Tnet = -370.44+453 =82.56N , which is positive means counterclockwise rotation.

b) Ta = 2.5x151 = 377.5N-m

Tnet = -370.44+377.5 = 7.06N-m , positive ,counterclockwise rotation.

c)Ta = 2x151 = 302N-m

Tnet = -370.44+302 = -68.44N-m, negative,clockwise rotation.

5 0

2 years ago

There are slightly more than one hundred elements known to exist. The smallest complete unit of an element that serves as the ba

Nostrana [21]

A) it is atom for e2020

7 0

3 years ago

How much does the gravitational force of attraction change between two asteroids if the two asteroids drift three times closer t

Katen [24]

Answer:

Increase 9 times

Explanation:

We have Newton formula for attraction force between 2 objects with mass and a distance between them:

$F_G = G\frac{M_1M_2}{R^2}$

where $G =6.67408 \times 10^{-11} m^3/kgs^2$ is the gravitational constant. $M_1, M_2$ is the masses of the 2 objects. and R is the distance between them.

Since the force is inversely proportional to the distance squared, if it is reduced by 3 times, the gravitational force between them would increase by $3^2 = 9$ times

6 0

2 years ago