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3 years ago

A vector is a quantity that has what two items

Physics

1 answer:

alexandr1967 [171]3 years ago

5 0

A vector has a size and a direction. The size is called the magnitude of the vector.

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A 83 kg man is resting on the roof top of his house. If he has a potential energy of

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Consider the three dip1acement vectors A = (3i - 3j) m, B = (i-4j) m, and C = (-2i + 5j) m. Use the component method to determin

tia_tia [17]

Answer with Explanation:

We are given that

A=3i-3j m

B=i-4 j m

C=-2i+5j m

a. $D=A+B+C$

$D=3i-3j+i-4j-2i+5j$

$D=2i-2j$

Compare with the vector r=xi+yj

We get x=2 and y=-2

Magnitude= $\mid D\mid=\sqrt{x^2+y^2}=\sqrt{(2)^2+(-2)^2}=2\sqrt 2$ units

By using the formula $\mid r\mid=\sqrt{x^2+y^2}$

Direction: $\theta=tan^{-1}\frac{y}{x}$

By using the formula

Direction of D: $\theta=tan^{-1}(\frac{-2}{2})=tan^{-1}(-1)=tan^{-1}(-tan45^{\circ})=-45^{\circ}$

b.E=-A-B+C

$E=-3i+3j-i+4j-2i+5j$

$E=-6i+12j$

$\mid E\mid=\sqrt{(-6)^2+(12)^2}=13.4$ units

Direction of E= $\theta=tan^{-1}(\frac{12}{-6}=tan^{-1}(-2)=-63.4^{\circ}$

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3 years ago

What are the units for mass and weight?

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The kilogram is the SI unit of mass and it is the almost universally used standard mass unit. The associated SI unit of force and weight is the Newton, with 1 kilogram weighing 9.8 Newtons under standard conditions on the Earth's surface.

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Answer:

The Mitochondria generates most of the chemical energy needed to power the cell's biochemical reactions.

Explanation:

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A He–Ne laser illuminates a narrow, single slit that is 1850 nm wide. The first dark fringe is found at an angle of 20.0∘ from t

egoroff_w [7]

Answer:

Wavelength of light will be 632.73 nm

Explanation:

We have given width of the single slit $d=1850nm-1850\times 10^{-9}m$

Angle is given as $\Theta =20^{\circ}$

We have to find the wavelength of light for first dark fringe

We know that for dark fringe it is given that

$dsin\Theta =n\lambda$

For first fringe n = 1

So $1850\times 10^{-9}\times sin20^{\circ} =1\times \lambda$

$\lambda =632.73nm$

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3 years ago