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4 years ago

13

how could a person easily tell which letters had four and which rive pages without opening the envelope? what assumptions did yo

u make

1 answer:

Lubov Fominskaja [6]4 years ago

5 0

Had 4 what and when you said rive did u mean 5

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According to the periodic table, the average atomic mass of helium is A) 2 amu. B) 2.0026 amu. C) 4.0026 amu. D) 6.0026 amu.

RUDIKE [14]

Answer:

C) 4.0026 amu

Explanation:

Helium (He) is the 2nd element on the Periodic Table.

It's neutral atom has 2 protons and 2 electrons.

It is in the 1st period and the 18th row.

It is also a Noble gas.

3 0

3 years ago

4. Find the uniform acceleration that causes a car’s velocity to change from 32m/s to

GrogVix [38]

Answer:

$a=8\ m/sec^2$

Explanation:

we know that

The formula to calculate the acceleration is

$a=\frac{V_2-V_1}{t}$

we have

$V_2=96\ m/sec$

$V_1=32\ m/sec$

$t=8\ sec$

substitute

$a=\frac{96-32}{8}$

$a=8\ m/sec^2$

4 0

4 years ago

A hanging nickel wire with diameter 0.12 cm is initially 2.7 m long. when a 117 kg mass is hung from it,

dedylja [7]

Yoooooo You want to mbe asd asdas

5 0

3 years ago

These questions !plz !! i need help!!!

Nataly_w [17]

(6) Wagon B is at rest so it has no momentum at the start. If <em>v</em> is the velocity of the wagons locked together, then

(140 kg) (15 m/s) = (140 kg + 200 kg) <em>v</em>

==> <em>v</em> ≈ 6.2 m/s

(7) False. If you double the time it takes to perform the same amount of work, then you <u>halve</u> the power output:

<em>E</em> <em>/</em> (2<em>t </em>) = 1/2 × <em>E/t</em> = 1/2 <em>P</em>

<em />

3 0

3 years ago

. A magnetic field has a magnitude of 0.078 T and is uniform over a circular surface whose radius is 0.10 m. The field is orient

Dmitriy789 [7]

Answer:

The magnetic flux through surface is $2.22 \times 10^{-3}$ Wb

Explanation:

Given :

Magnitude of magnetic field $B = 0.078$ T

Radius of circle $r = 0.10$ m

Angle between field and surface normal $\theta =$ 25°

From the formula of flux,

$\phi = B.A$

$\phi = BA\cos \theta$

Where $\theta =$ angle between magnetic field line and surface normal, $A =$ area of circular surface.

$A = \pi r^{2}$

$A = 3.14 \times (0.10) ^{2}$

$A = 0.0314$ $m^{2}$

Magnetic flux is given by,

$\phi = 0.078 \times 0.0314 \times \cos 25$

$\phi = 2.22 \times 10^{-3}$ Wb

Therefore, the magnetic flux through surface is $2.22 \times 10^{-3}$ Wb

6 0

4 years ago