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3 years ago

What is he total resistance? A. 20 ohms B. 90 ohms C. 40 ohms D. 30 ohms

Physics

2 answers:

ehidna [41]3 years ago

6 0

Imma guess A! Idk if it’s 100% correct tho so I’d check that!

pochemuha3 years ago

4 0

They’re all connected in series
so Rt = R1 + R2 + R3 = 20 + 30 + 40 = 90 Ω

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What is the speed of an object at rest

Alisiya [41]

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3 years ago

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Alexus [3.1K]

Answer:

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Explanation:

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4 years ago

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If the swimmer starts at rest, slides without friction, and descends through a vertical height of 2.41 m

AveGali [126]

Answer:

6.88 m/s

Explanation:

The Conservation of Energy states that:

Initial Kinetic Energy + Initial Potential Energy = Final Kinetic Energy + Final Potential Energy

So we can write

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$gh_{i}+\frac{1}{2}v_{i} ^{2}=gh_{f}+\frac{1}{2}v_{f} ^{2}$

Lets solve for $v_f$

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Subtract $gh_f$ from both sides of the equation.

$gh_{i}+\frac{v_{i} ^{2}}{2}-gh_{f}=\frac{v_{f} ^{2}}{2}$

Multiply both sides of the equation by 2.

$2(gh_{i}+\frac{v_{i} ^{2}}{2}-gh_{f})={v_{f} ^{2}$

Simplify the left side.

Apply the distributive property.

$2(gh_{i})+2\frac{v_{i} ^{2}}{2}+2(-gh_{f})={v_{f} ^{2}$

Cancel the common factor of 2.

$2gh_{i}+v_{i} ^{2}-2gh_{f}={v_{f} ^{2}$

Take the square root of both sides of the equation to eliminate the exponent on the right side.

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We are given $g,v_{i},h_{i},h_{f}$ .

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Anything multiplied by 0 is 0.

${v_{f}=\sqrt{2*9.81*2.41$

${v_{f}=\sqrt{47.2842$

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1 year ago

A firework is launched with a force of 700 N and a momentum of 200 kg-m/s. How much time before is explodes?

8_murik_8 [283]

Answer:

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Explanation:

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3 years ago

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