3 years ago

When you blow across the top of

Physics

1 answer:

Tanya [424]3 years ago

4 0

Answer:

the new foundation would be

Explanation:

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a principle stating that energy cannot be created or destroyed, but can be altered from one form to another.

Explanation:

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3 years ago

If |v|= 11, |w|= 23, |v-w|= 30, find |v+w|

GenaCL600 [577]

Answer:

$|v+w|=20$

Explanation:

We are given that

|v|=11

|w|=23

|v-w|=30

We have to find the value of |v+w|

|a-b|^2=(a+b)\cdot (a+b)=a^2+b^2-2|a||b|cos\theta

Using the formula

$(30)^2=(11)^2+(23)^2-2(11)(23)cos\theta$

$900=121+529-506cos\theta$

$900-121-529=-506cos\theta$

$250=-506cos\theta$

$cos\theta=-\frac{250}{506}$

$|a+b|^2=|a|^2+|b|^2+2a\cdot bcos\theta$

Using the formula

$|v+w|^2=(11)^2+(23)^2+2(11)(23)\times (-\frac{250}{506})$

$|v+w|^2=400$

$|v+w|^2=(20)^2$

$|v+w|=20$

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3 years ago

Ethan pushes a wooden box across a carpeted floor. Then he pushes the same box across a smooth marble floor. Why does Ethan find

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Two wires, each of length 1.3 m, are stretched between two fixed supports. On wire A there is a second-harmonic standing wave wh

UNO [17]

Answer:

Explanation:

Given

Length of each wire $L=1.3\ m$

On wire A second harmonic frequency is given by

$f_2_{a}=2\times (\frac{v}{2L})$

where f=frequency

v=velocity of wave

L=length of wire

$v_a=f_2\times L$

$v_a=640\times 1.3=832\ m/s$

For wire B third harmonic is given by

$f_3_{b}=3\times (\frac{v}{2L})$

$v_b=\frac{2L}{3}\cdot f_3_{b}$

$v_b=\frac{2\times 1.3}{3}\times 640=554.66\ m/s$

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Answer:

physical attractiveness

Explanation:

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