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3 years ago

When energy is changed from one form to another, ____.

Physics

2 answers:

vladimir2022 [97]3 years ago

8 0

Answer:

B. All of the energy can be accounted for.

Explanation:

Energy is never lost or destroyed.

vampirchik [111]3 years ago

5 0

I think b is the answer but im not 100% sure

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A uniform, spherical, 1900.0 kg shell has a radius of 5.00 m. Find the gravitational force this shell exerts on a 1.80 kg point

Mandarinka [93]

Answer:

$F=9.09\times 10^{-9} N$

Explanation:

We are given that

Mass of spherical shell, $m_1$ =1900 kg

Mass= $m_2=1.80 kg$

Radius of shell=r=5 m

Distance between two masses=r=5.01 m

Because distance measure from center .

Gravitational force

$F=G\frac{m_1m_2}{r^2}$

$G=6.67\times 10^{-11} Nm^2/kg^2$

Using the formula

$F=6.67\times 10^{-11}\times \frac{1900\times 1.80}{(5.01)^2}$

$F=9.09\times 10^{-9} N$

Hence,the gravitational force = $F=9.09\times 10^{-9} N$

6 0

3 years ago

A ladybug sits at the outer edge of a turntable, and a gentleman bug sits halfway between her and the axis of rotation. The turn

inn [45]

Answer:

The answer to the question is

The ladybug begins to slide

Explanation:

To solve the question we assume that the frictional force of the ladybug and the gentleman bug are the same

Where the frictional force equals $F_{Friction}$ = μ×N = m×g×μ

and the centripetal force is given by m·ω²·r

If we denote the properties of the ladybug as 1 and that of the gentleman bug as 2, we have

m₁×g×μ = m₁·ω²·r₁ ⇒ g×μ = ω²·r₁

and for the gentleman bug we have

m₂×g×μ = m₂·ω²·r₂ ⇒ g×μ = ω²·r₂

But r₁ = 2×r₂

Therefore substituting the values of r₁ =2×r₂ we have

g×μ = ω²·r₁ = g×μ = ω²·2·r₂

Therefore ω²·r₂ = 0.5×g×μ for the ladybug. That is the ladybug has to overcome half the frictional force experienced by the gentleman bug before it start to slide

The ladybug begins to slide

6 0

3 years ago

Eli's gross income as a painter is $30,000 per year, which places him in the 15% approximate tax bracket. How much does he pay i

Umnica [9.8K]

Answer: $4,500

Explanation: 1% of $30,000 would be $300. If you multiply that by 15, you get $4,500, so 15% of 30,000 is 4,500.

3 0

3 years ago

A parachute works because the canvas of the parachute is acted upon by __________.

Ne4ueva [31]

The question is asking to choose among the following choices that could complete the question about the inertia, base on my research and further investigation, the possible answer would be letter B. Gravity. I hope you are satisfied with my answer and feel free to ask for more

8 0

3 years ago

Read 2 more answers

Find the angle between the vectors. (First find an exact expression and then approximate to the nearest degree.) a = 2i − 5j + k

EastWind [94]

Answer:

Angle=70°

Explanation:

Given data

a=2i-5j+k

b=9i-k

To find

Angle Θ

Solution

As we know from dot product rule that

$a.b=|a||b|cos\alpha \\cos\alpha=\frac{a.b}{|a||b|}\\\alpha=cos^{-1} (\frac{a.b}{|a||b|})$

First we need to find a.b

i.i=j.j=k.k=1

i.j=i.k=j.k=0

$a.b=(18)+(-1)\\a.b=17$

Now for |a| and |b|

$|a|=\sqrt{x^{2} +y^{2}+z^{2} }\\|a|=\sqrt{(2)^{2} +(-5)^{2}+(1)^{2} }\\ |a|=5.477\\And\\|b|=\sqrt{x^{2} +y^{2}+z^{2} }\\|b|=\sqrt{(9)^{2} +(0)^{2}+(-1)^{2} }\\|b|=9.055$

So the angle is given as

$\alpha=cos^{-1} (\frac{a.b}{|a||b|})\\\alpha=cos^{-1} (\frac{17}{(5.477)*(9.055)})\\\alpha =70^{o}$

4 0

3 years ago