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3 years ago

12

Which of the following best describes a vector?

1 answer:

garik1379 [7]3 years ago

5 0

Vectors are used to represent physical magnitudes that have an associated address. For example, if we want to represent the displacement of an object, it is not enough to describe only the distance as 10 meters, it is also necessary to describe in which direction the displacement occurred, for example, 30 ° towards the northeast.

Therefore the vectors are measured in one or several dimensions that include a magnitude and an address.

The correct option is the last:

"<em>a measurement in more than one dimension that includes a magnitude and a direction</em>"

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In which situations is gravitational potential energy present? Check all that apply.

lukranit [14]

A person walks up a flight of stairs √
Wind lifts a balloon into the air √
A weightlifter holds a barbell straight overhead √

Gravity is used in most real world examples because if not of gravity everyone would be floating all around ^-^

Hope this helps ;p

8 0

3 years ago

Read 2 more answers

A squirrel on a limb near the top of a tree loses its grip on a nut, so that the nut slips away horizontally at a speed of 1.5m/

tatiyna

Answer:

The height of the squirrel $h =113 \ m$

Explanation:

From the question we are told that

The horizontally speed is $v = 1.5 m/s$

The horizontal distance $d = 7.2 \ m$

Generally the the time taken is mathematically represented

$t = \frac{d}{v}$

=> $t = \frac{7.2}{1.5}$

=> $t = 4.8 \ s$

Generally from kinematic equation we have that

$h = ut + \frac{1}{2} gt^2$

Here u is the initial velocity of nut in the vertical and the value is 0 m/s

$h = 0 * 4.8 + \frac{1}{2} * 9.8 * (4.8)^2$

=> $h =113 \ m$

6 0

3 years ago

The melting point of a substance occurs at the same temperatures as it’s blank point

azamat

I think it's a.

Explanation:

melting point is boiling

4 0

4 years ago

Read 2 more answers

Fermi energy of conduction electrons in silver is 0.548 J. Calculate the number of such electrons in unit cm3

ICE Princess25 [194]

Answer:

$n=1.86*10^{-30}m^3$

Explanation:

From the question we are told that:

Fermi energy of conduction electrons $E_f=0.548J$

Generally the equation for Fermi energy is mathematically given by

$E_f=\frac{3}{\pi}^2/3*\frac{h^2}{8m}*{n^{2/3}}$

$E_f=\frac{3}{\pi}^2/3*\frac{h^2}{8m}*{n^{2/3}}$

${n^{2/3}}=\frac{E_f}{\frac{3}{\pi}^2/3*\frac{h^2}{8m}}$

Where

h= Planck's constant

${n^{2/3}}=\frac{E_f}{\frac{3}{\pi}^2/3*\frac{h^2}{8m}}$

${n^{2/3}}=\frac{0.548J}{3.62*10^{-19}}$

$n=(1.51*10^{-20})^{3/2}$

$n=1.86*10^{-30}m^3$

3 0

3 years ago

Which of these is a biotic factor? <br> A) topography <br> B) soil <br> C )air <br> D)bacteria

vitfil [10]

D I might be wroung .....i think this so the answer because biotic are all living things and bacteria is living

7 0

3 years ago