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rewona [7]
3 years ago
13

A planet moves fastest in its orbit around the sun when it is at which position?

Physics
2 answers:
Nesterboy [21]3 years ago
6 0

Answer:

When it's closest to the sun.

Explanation:

The force of gravity acting on a planet is equal to its mass times its centripetal acceleration.

Fg = m v^2 / r

The force of gravity is defined by Newton's law of universal gravitation as:

Fg = mMG / r^2

Therefore:

mMG / r^2 = m v^2 / r

MG / r = v^2

v increases as r decreases.  So the planet is moving fastest when it's closest to the sun, also known as the <em>perihelion</em>.

Akimi4 [234]3 years ago
6 0

Answer:

closest to

Explanation:

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A 2 kg block is pushed against a spring (k = 400 N/m), compressing it 0.3 m. When the block is released, it moves along a fricti
Kitty [74]

Answer:

2.29 \mathrm{m} \text { the block slide if the } \mathrm{u}_{\mathrm{s}}=0.4

4.58 \mathrm{m} \text { the block slide if the } \mathrm{u}_{\mathrm{k}}=0.2

Explanation:

Given values  

Mass (m) = 2kg

K = 400 N/M

Compressing it 0.3 m

<u>The law of conservation of energy</u>:

\frac{m v^{2}}{2}+\frac{k x^{2}}{2}=\text { constant }

\text { Where, } \frac{m v^{2}}{2} \text { is kinetic energy of the block. }

\frac{k \Delta l^{2}}{2} Energy of the spring deformation.

M mass of the block

x spring deformation

Therefore, if block left the spring (x = 0)

\frac{m v^{2}}{2}+0=0+\frac{k \Delta l^{2}}{2}

Where, Δl is initial spring deformation

\frac{m v^{2}}{2}=\frac{k \Delta l^{2}}{2}

\mathrm{v}^{2}=\frac{k \Delta l^{2}}{m}

\mathrm{v}=\sqrt{\frac{k}{m} \times \Delta l^{2}}

v=\sqrt{\frac{400}{2} \times(0.3)^{2}}

\mathrm{v}=\sqrt{200 \times 0.09}

<u>The law of conservation of energy</u>:

\frac{m v^{2}}{2}+m g h=\text { constant }

Where h is height

\frac{m v^{2}}{2}+0=0+m g h

\frac{m v^{2}}{2}=m g h

Cancel mass "m" each side

\mathrm{h}=\frac{v^{2}}{2 g}

Distance along incline equals

\begin{array}{ll}{\text { For friction us }} & {\left(L=\frac{h}{u_{s}}\right)} \\ {\text { For friction } u_{k}} & {\left(L=\frac{h}{u_{k}}\right)}\end{array}

\begin{array}{l}{\mathrm{u}_{\mathrm{s}}=0.4} \\ {\mathrm{U}_{\mathrm{k}}=0.2} \\ {\text { For friction } \mathrm{u}_{\mathrm{s}}}\end{array}

\begin{array}{l}{\mathrm{h}=\frac{v^{2}}{2 g u_{s}}} \\ {\mathrm{L}=\frac{4.24^{2}}{2 \times 9.8 \times 0.4}} \\ {\mathrm{L}=\frac{17.9776}{784}}\end{array}

\begin{array}{l}{L=2.29 \mathrm{m}} \\ {2.29 \mathrm{m} \text { the block slide if the } \mathrm{u}_{5}=0.4} \\ {\text { For friction } \mathrm{u}_{\mathrm{k}}} \\ {\mathrm{L}=\frac{4.24^{2}}{2 \times 9.8 \times 0.2}}\end{array}

\begin{array}{l}{L=\frac{17.9776}{3.92}} \\ {L=4.58 \mathrm{m}} \\ {4.58 \mathrm{m} \text { the block slide if the } \mathrm{u}_{5}=0.4}\end{array}

8 0
2 years ago
Calculate the minimum frequency of ultrasound (in Hz) that will allow you to see details as small as 0.193 mm in human tissue. (
STatiana [176]

Answer:

f = 7.97 x 10⁶ Hz = 7.97 MHz

Explanation:

The speed of a wave is given by the following formula:

v = f\lambda

where,

v = speed of the ultrasound wave through human tissue = 1540 m/s

f = frequency of ultrasound wave required = ?

λ = wavelength of ultrasound waves = smallest detail required = 0.193 mm

λ = 0.193 mm = 1.93 x 10⁻⁴ m

Therefore,

1540\ m/s = f(1.93\ x\ 10^{-4}\ m)\\f = \frac{1540\ m/s}{1.93\ x\ 10^{-4}\ m}

<u>f = 7.97 x 10⁶ Hz = 7.97 MHz</u>

8 0
3 years ago
If an object has zero acceleration, does it have to have zero velocity?
adelina 88 [10]

Answer:

Yes, the velocity would also be zero.

Explanation:

Acceleration is the change in velocity over time, therefore, there has to be a change in velocity for something to accelerate. which means without acceleration, the object has no velocity.

3 0
2 years ago
A farm tractor tows a 3300-kg trailer up a 14" incline with a steady speed of 2.8 m/s. what force does the tractor exert on the
gladu [14]

The force exerted by gravity is:

F = m g

F = 3300 kg * 9.8 m/s^2

F = 32,430 N

 

The force exerted due to the inclined plane is:

F tractor = 32,430 N * sin 14

<span>F tractor = 7,823.75 N      (answer)</span>

7 0
2 years ago
3.The space heater in a room does not have a fan, but after a few minutes you feel warm air moving by you. What type of energy t
Natali [406]
Heat transfer

Have a good day
6 0
2 years ago
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