1answer.
Ask question
Login Signup
Ask question
All categories
  • English
  • Mathematics
  • Social Studies
  • Business
  • History
  • Health
  • Geography
  • Biology
  • Physics
  • Chemistry
  • Computers and Technology
  • Arts
  • World Languages
  • Spanish
  • French
  • German
  • Advanced Placement (AP)
  • SAT
  • Medicine
  • Law
  • Engineering
ra1l [238]
4 years ago
9

I need this ASAP pleaseeeeI’ll give you most Brainly

Physics
1 answer:
fgiga [73]4 years ago
6 0

Answer:

1) B a compound

2) C a heterogeneous mixture

3) A an element

Explanation:

1) I know this because a compound is mixture of different elements which cannot be identified by the naked eye. And from the statement above the substance is distinguished to have to different elements by its chemical formula.

2) I know this because a heterogeneous mixture is a mixture composed of two or more elements which can easily be seen by the physical eye or can be distinguished easily.

3) I know this because noble gases are not a mixture of any kind. They are elements. Elements are substances that cannot be broken down into simpler substances.

You might be interested in
Plz do all of it i will give brainlest and thanks to best answer<br> plz do it right
Sladkaya [172]

Answer: The answer is B: Convection  

Explanation: Convection transfers heat through a movement of fluids but in this case its through air hope this helps :)

8 0
3 years ago
800 has 1 significant digit.
serg [7]

Answer:

yes, 800 has 1 significant digit

neither leading zero nor trelling zero are significant figure except when there's a decimal point

4 0
3 years ago
1. Which of the following would be a testable hypothesis?
Naddik [55]
B dropping a ball
C tentative and testable
7 0
3 years ago
The lowest note on a grand piano has a frequency of 27.5 Hz. The entire string is 2.00 m long and has a mass of 400 g. The vibra
Norma-Jean [14]

Answer:

1456 N

Explanation:

Given that

Frequency of the piano, f = 27.5 Hz

Entire length of the string, l = 2 m

Mass of the piano, m = 400 g

Length of the vibrating section of the string, L = 1.9 m

Tension needed, T = ?

The formula for the tension is represented as

T = 4mL²f²/ l, where

T = tension

m = mass

L = length of vibrating part

F = frequency

l = length of the whole part

If we substitute and apply the values we have Fri. The question, we would have

T = (4 * 0.4 * 1.9² * 27.5²) / 2

T = 4368.1 / 2

T = 1456 N

Thus, we could conclude that the tension needed to tune the string properly is 1456 N

4 0
3 years ago
A 40 kg girl and an 8.4 kg sled are on the surface of a frozen lake, 15 m apart. By means of a rope, the girl exerts a 5.2 N for
stealth61 [152]

Answer:

(a) a_s=0.62\frac{m}{s^2}

(b) a_s=0.13\frac{m}{s^2}

(c) x_f=2.6m

Explanation:

(a) According to Newton's second law, the acceleration of a body is directly proportional to the force exerted on it and inversely proportional to it's mass.

a_s=\frac{F}{m_s}\\a_s=\frac{5.2N}{8.4kg}\\a_s=0.62\frac{m}{s^2}

(b) According to Newton's third law, the force that the sled exerts on the girl is equal in magnitude but opposite in the direction of the force that the girl exerts on the sled:

a_g=\frac{F}{m_g}\\a_g=\frac{5.2N}{40kg}\\a_g=0.13\frac{m}{s^2}

(c) Using the kinematics equation:

x_f=x_0+v_0t \pm  \frac{at^2}{2}

For the girl, we have x_0=0 and v_0=0. So:

x_f_g=\frac{a_gt^2}{2}(1)

For the sled, we have v_0=0. So:

x_f_s=x_0_s-\frac{a_st^2}{2}(2)

When they meet, the final positions are the same. So, equaling (1) and (2) and solving for t:

x_0_s-\frac{a_st^2}{2}=\frac{a_st^2}{2}\\t^2(a_g+a_s)=2x_0_s\\t=\sqrt{\frac{2x_s_0}{a_g+a_s}}\\t=\sqrt{\frac{2(15m)}{0.13\frac{m}{s^2}+0.62\frac{m}{s^2}}}\\t=6.32s

Now, we solve (1) for x_f_g

x_f_g=\frac{0.13\frac{m}{s^2}(6.32s)^2}{2}\\x_f_g=2.6m\\x_f=2.6m

5 0
3 years ago
Other questions:
  • A few hundred tons of comet dust are added to Earth daily from the millions of meteors that enter our atmosphere. Estimate the t
    11·1 answer
  • true or false the Richter scale describes the effects of an earthquake on people, buildings, and land at a given location.
    11·2 answers
  • Please answer the number 5 6 and 7. I don't know what to do its our hw in physics. (new lesson as well)
    6·1 answer
  • A 200 Hz tuning fork is sounded at the same time as a guitar string and a beat frequency of 4 Hz is heard. Which of the followin
    14·1 answer
  • What causes the rider on a roller coaster to experience the + or - g’s if gravity always remains the same on earth
    9·1 answer
  • A system of two blocks are connected by a string. These blocks are horizontally accelerated by an applied force of magnitude F o
    9·1 answer
  • A running back with a mass of 70 kg travels down the field with a velocity of 5.0 ms . Calculate the kinetic energy of the footb
    11·1 answer
  • A light bulb will turn on only when the switch is
    13·1 answer
  • What is the reason behind superposition?why waves behave this way?
    12·1 answer
  • Write the poem titled is Handcuffs and write a dairy entry over two days as the speaker who is in prison.
    13·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!