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3 years ago

I’m done with Brainly so I’m giving out my points #5

Physics

2 answers:

pshichka [43]3 years ago

6 0

Answer:

okay, thanks again

Explanation:

Sidana [21]3 years ago

5 0

Answer:

Oki, thanks so much! :) Come back someday tho... Brainly'll need you! :)

Explanation:

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A child is pushing a merry-go-round. the angle through which the merry-go-round has turned varies with time according to θ(t)=γt

Andreyy89

I attached the missing part of the question.
Part A
Angular velocity is simply the rate at which angle changes, in other words, it is the first derivative of the angle function with respect to time:
$\theta (t)=\gamma t+\beta t^3\\ w(t)=\frac{d\theta(t)}{dt}\\ w(t)=\gamma +3\beta t^2$
Part B
Initial value is the value at t=0. To find initial value we simply plug t=0 into the equation.
$w(0)=\gamma +3\beta\cdot 0^2\\
w(0)=\gamma\\
w_0=\gamma= 0.422\frac{rad}{s}$
Part C
To find these values we simply need to plug in t=5 in the equation.
$w(5)=\gamma +3\beta\cdot 5^2\\
w(5)=\gamma +75\cdot \beta=0.422+75 \cdot 1.35\cdot10^{-2}=1.43\frac{rad}{s}$
Part D
Average angular velocity is total angular displacement divided by time:
$w_{av}=\frac{\Delta \theta}{\Delta t}$
$\Delta \theta=\theta(5)-\theta(0)=\gamma\cdot5+\beta 5^3\\
\Delta \theta=0.422\cdot5+125\cdot1.35\cdot10^{-2}=3.7975 $rad$
The average angular velocity is:
$w_{av}=\frac{\Delta \theta}{\Delta t}=\frac{3.7975 }{5}=0.7595\frac{rad}{s}$

3 0

3 years ago

Can someone explain what is force constant k in Hooke’s law <br><br> F = kx

Vinvika [58]

Answer:

answer is in photo

8 0

3 years ago

Compare and contrast light waves and sound waves

Naddika [18.5K]

The difference between light waves and sound waves are that sound waves travel faster than light wave and have a frequency range while light waves have a to me range.

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3 years ago

When a skydiver jumps out of a plane in free fall, they hit a

IRISSAK [1]

Answer:

By decreasing the surface area exposed to the air. Vertical body position instead of horizontal.

Explanation:

So the terminal velocity formula is as follows.

v = sqrt[(2*m*g)/(p*A*c)]

m = mass

g = 9.81 m/s^2

p = density of air

A = surface area of object

c = Drag coefficient

So the only thing you can change in mid-air is surface area.

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3 years ago

The earth's magnetic moment is 8 x 1022 a-m2. If that moment were created by a loop of wire going around the earth (r = 6378 km)

Elena L [17]

Answer:

M = I A definition of magnetic moment - current * area

A = π R^2 = π * (6.4E6)^2 = 1.3E14 m^2

I = 8E22 A-m^2 / 1.3E14 m^2 = 6.2E8 amperes

I = 620,000,000 amps

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2 years ago