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mamaluj [8]
2 years ago
11

U= (-5,3) find the magnitude of u. please help me

Physics
1 answer:
Fantom [35]2 years ago
3 0

u = 5.83

Explanation:

The magnitude of a vector \vec{u} is

|\vec{u}| = \sqrt{u_z^2 + u_y^2} = \sqrt{(-5)^2 + (3)^2}

\:\:\:\:\:\:\:= \sqrt{34} = 5.83

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Answer:

7.2g

Explanation:

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L=specific latent heat of water(steam)=2268J/g

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c_{c}=specific heat capacity of calorimeter =0.9J/gk

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m_{c}=38g

α=change in temperature

\alpha _{c}=(40-25)=15

\alpha _{w}=(40-25)=15

\alpha _{s}=(100-40)=60

Note: the temperature of the calorimeter is the temperature of it content.

From the equation, we can make m_{s} the subject of formula

m_{s}=\frac{m_{w}c_{w} \alpha +m_{c}c_{c}\alpha}{c_{w}\alpha +l}

Hence

m_{s}=\frac{(280*4.2*15) +(38*0.9*15)}{(4.2*60) +2268} \\m_{s}=\frac{18153}{2520}\\ m_{s}=7.2g

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3 years ago
1)a persons ________ will change if they move from the earth to the moon
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Answer: The coefficient of kinetic friction is μ = 0.6

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