3 years ago

True or false? Electrons can move, but positive charges can't.True or false? Electrons can move, but positive charges can't.

Physics

1 answer:

shepuryov [24]3 years ago

7 0

Answer:

true

Explanatio

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Given that o.2i+bj+o.4k is a unit vector,what is the value of b?

pishuonlain [190]

Answer:

b = 0.89

Explanation:

The given vector is, $A=0.2i+bj+0.4k$

A is a unit vector

We need to find the value of b.

For a unit vector, |A| = 1

So,

$0.2^2+b^2+0.4^2=1\\\\0.04+b^2+0.16=1\\\\0.2+b^2=1\\\\b^2=1-0.2\\\\b=0.89$

So, th value of b is 0.89.

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3 years ago

Which chemical reaction is most likely the slowest?

NemiM [27]

B. takes the longest!

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3 years ago

An electrical motor spins at a constant 2695.0 rpm. If the armature radius is 7.165 cm, what is the acceleration of the edge of

djyliett [7]

Answer:

Acceleration will be $5706.77rad/sec^2$

So option (D) will be correct answer

Explanation:

We have given angular speed of the electrical motor $\omega =2695rpm$

We have to change this angular speed in rad/sec for further calculation

So $\omega =2695rpm=2695\times \frac{2\pi }{60}=282.2197rad/sec$

Armature radius is given r = 7.165 cm = 0.07165 m

We have to find the acceleration of edge of motor

Acceleration is given by $a=\omega ^2r=282.2197^2\times 0.07165=5706.77rad/sec^2$

So acceleration will be $5706.77rad/sec^2$

So option (D) will be correct answer

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4 years ago

Which three elements have strong magnetic properties?

icang [17]

Answer: iron, nickel, and cobalt.

Explanation:

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4 years ago

T/F The outer planets have solid surfaces that are very rocky and dense

Luba_88 [7]

Answer:

False

Explanation:

the inner planets have solid rocky dense surfaces

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3 years ago