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4 years ago

An element is ____

Physics

2 answers:

Likurg_2 [28]4 years ago

8 0

An element is C. A substance with only one type of Atom

Arisa [49]4 years ago

5 0

Answer:

C. A substance with only one type of atom

Explanation:

An element is a type of substance which is made up of only one type of an atom. Taking the example the hydrogen is made up of 1 proton and 1 electron. If any one look at the atom of hydrogen then he notice that the most of the atoms of hydrogen do not contain any neutrons but few of them contain 1 or 2 neutrons.

These different type of hydrogen is known as isotopes which contains same no. of protons but different no. of neutrons.

If you change the proton which means you change the element but if you change the neutron no. means you change its isotope.

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Which object would have a LARGER gravitational force acting upon it? (assume the objects are at the same height above the Earth.

juin [17]

It would be D because there is more gravitational forces acting on it than a small block of wood

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3 years ago

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Show that the speed with which a projectile leaves the ground is equal to its speed just before it strikes the ground at the end

Rina8888 [55]

Answer:

Thus, the velocity at the time of strike is same as the velocity at the time of projection.

Explanation:

Let a projectile is projected vertically upwards with a speed of u and reaches to the maximum height H.

At maximum height , the speed is zero and then the projective comes back on the ground.

Use the third equation of motion

$v^2 = u^2 + 2 g h \\\\0 = u^2 - 2 g H\\\\\u =\sqrt{2gH}$

Now let the velocity at the time of strike is v'.

Use third equation of motion, here initial velocity is zero.

$v'^2 = 0 + 2 g H \\\\v = \sqrt{2gH}$

Thus, the velocity at the time of strike is same as the velocity at the time of projection.

8 0

3 years ago

A substance sample has a Mass of 45.0 g, and the Data Safety

marishachu [46]

The volume of the sample is 48.39 cm³.

<h3 /><h3>What is volume?</h3>

The term volume refers to the amount of three-dimensional space taken up by an item or a closed surface

To calculate the volume of the sample, we use the formula below

Formula:

D = m/v
v = m/D................ Equation 1

Where:

m = Mass of the smaple
D = Density of the sample
v = Volume of the sample.

From the question,

Given:

m = 45 g
D = 0.93 g/cm³

Substitute these values into equation 1

v = 45/0.93
v = 48.39 cm³

Hence, the volume of the sample is 48.39 cm³.

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2 years ago

A wire of resistance R is cut into ten equal parts which are then connected in parallel. The equivalent resistance of the combin

Greeley [361]

Answer:

<em>The equivalent resistance of the combination is R/100</em>

Explanation:

<u>Electric Resistance</u>

The electric resistance of a wire is directly proportional to its length. If a wire of resistance R is cut into 10 equal parts, then each part has a resistance of R/10.

Parallel connection of resistances: If R1, R2, R3,...., Rn are connected in parallel, the equivalent resistance is calculated as follows:

$\displaystyle \frac{1}{R_e}=\frac{1}{R_1}+\frac{1}{R_2}+\frac{1}{R_3}+...+\frac{1}{R_n}$

If we have 10 wires of resistance R/10 each and connect them in parallel, the equivalent resistance is:

$\displaystyle \frac{1}{R_e}=\frac{1}{R/10}+\frac{1}{R/10}+\frac{1}{R/10}...+\frac{1}{R/10}$

This sum is repeated 10 times. Operating each term:

$\displaystyle \frac{1}{R_e}=\frac{10}{R}+\frac{10}{R}+\frac{10}{R}+...+\frac{10}{R}$

All the terms have the same denominator, thus:

$\displaystyle \frac{1}{R_e}=10\frac{10}{R}=\frac{100}{R}$

Taking the reciprocals:

$R_e=R/100$

The equivalent resistance of the combination is R/100

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3 years ago

For maximum radiation protection the suggested distance between array fan-beam scanner source and the operator is:

krok68 [10]

For maximum radiation protection the suggested distance between array fan-beam scanner source and the operator is 2m.

The Fan beam 5 position reference system (PRS) uses accurate time-of-flight laser technology to determine vessel position relative to custom reflectors.

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The operators’ desk should be positioned at least 1m away from a pencil beam, and at least 2m from a fan-beam system. Some older models, that are not now common, require a distance of 3.5 m.

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2 years ago