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3 years ago

Which of the following is the name for matter made up of only one type of atom?

Physics

2 answers:

kolbaska11 [484]3 years ago

5 0

Answer: <u>Element </u>

Explanation:

A chemical element is a substance which contain only one type of atom and it may be in the form solid, liquid and gas. On more the smallest particle of element is the atom.

Leona [35]3 years ago

5 0

Answer:

element

Explanation:

I just took the test and got it right

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Consider the third period of the periodic table. Which element has the smallest atomic radius?

Anettt [7]

According to periodic trends in the periodic table, the atomic radius decreases from left to right.

In period three, the element with the smallest atomic radius would be the element in the rightmost area. Protons increase as it goes to the right, which would mean they pull in electrons closer which decreases the size.

So in period 3, the element with the smallest atomic radius is Argon (Ar).

3 0

4 years ago

What does the pressure exerted by a gas depend on

pshichka [43]

Answer:

Explanation:

The amount of gas, the volume, and the temperature.

5 0

3 years ago

A concave mirror produces a real image that is three times as large as the object. If the object is 20 cm in front of the mirror

TiliK225 [7]

Answer:

The image is produced 60 cm behind the mirror

The focal length of the mirror is 30 cm

Explanation:

u = Object distance = 20 cm

v = Image distance

f = Focal length

m = Magnification = 3

$m=-\frac{v}{u}\\\Rightarrow 3=-\frac{v}{20}\\\Rightarrow v=-3\times 20\\\Rightarrow v=-60\ cm$

The image is produced 60 cm behind the mirror

$\frac{1}{f}=\frac{1}{u}+\frac{1}{v}\\\Rightarrow \frac{1}{f}=\frac{1}{20}+\frac{1}{-60}\\\Rightarrow \frac{1}{f}=\frac{1}{30}\\\Rightarrow f=\frac{30}{1}=30\ cm$

The focal length of the mirror is 30 cm

8 0

3 years ago

Cecelia dropped a ball from a height of 2 m. The ball fell in a straight path down to the ground

trapecia [35]

The correct answer to the question is : A) Tossing it horizontally at a faster speed.

EXPLANATION:

Before going to answer this question, first we have to know the horizontal distance covered by any body when it is fired parallel to the ground.

Let us consider a body of mass m is fired with velocity u parallel to the ground. Let it was projected at a height h from the ground.

Hence, the horizontal distance covered by the projectile is calculated as -

Horizontal distance R = $u\times \sqrt{\frac{2h}{g}}$ .

Here, g is known as the acceleration due to gravity.

From above, we see that more is the initial velocity, the more is the horizontal distance covered by it i.e the more is the widest curved path.

Hence, the correct answer to the question is that tossing a ball horizontally at a faster speed will trace out the widest curved path.

6 0

3 years ago

Read 2 more answers

A kid at the junior high cafeteria wants to propel an empty milk carton along a lunch table by hitting it with a 3.0g spit ball.

Natasha_Volkova [10]

Answer:

4.3 m/s

Explanation:

Using conservation of momentum, assume that the collision is elastic and that the 3.0 g ball stuck with the carton

3.0 g = 3 / 1000 = 0.003 kg = m₁

40 g = 40 / 1000 = 0.04 kg = m₂, u₂ = 0 since the body is stationary and v = 0.3m/s

m₁u₁ + m₂u₂ = v ( m₁ + m₂)

0.003 u₁ = 0.30 ( 0.003 + 0.04) = 0.0129

u₁ = 0.0129 / 0.003 = 4.3 m/s

5 0

3 years ago