A researcher is trying to identify whether household substances are basic. Which approach would BEST help the researcher
investigate whether substances are basic?

A. Test each substance with red litmus paper.

B. Test each substance with blue litmus paper.

C. Observe each substance and record its color.

D. Mix each substance with a weak base and record the results.

Answers

Answer 1

Answer:

a

Explanation:

because red litmus paper turn blues under base or alkaline condition


Related Questions

Which best describes what the observations have in common? They involve nuclear energy. They involve radiant energy. They involve changes in waves. They involve changes in energy.

Answers

Answer:

The answer is "They involve changes in energy".

Explanation:

Energy change is quite important in chemicals because nearly all reactions involve activation energy. They will learn and learn how to utilize different types of energy shifts in the steam cycle. A conversation about what drives chemical processes contributes to entropy and natural energy principles. It may shift from the shape of form. For example, chemicals might change to heat. Laser light can turn substances into power. Its energy can be changed into different kinds, but not wasted or produced.

Answer:

D

Explanation:

change in energy please give brainliest (edge 2021)

Explain the different types of motion of a sewing machine​

Answers

I got the same answer as above. So she is correct.

Answer

Thus, the earth has three types of motion at the same time i.e. circular motion, periodic motion and rotational motion. ... So, the wheel of a sewing machine shows rotational motion. The sewing machine has also a needle which moves up and down continuously (as log as the wheel rotates).

Luna and Angela are competitors in a running competition. Both are leading the race and enter at the same time the last 30 meters. Angela enters the final segment runnning at 4 m/s and "applies" an acceleration of 2 m/s2 while Luna enters the final segment at 3m/s but "applies " an acceleration of 3 m/s2. (a) Who finishes the race first? (Do the calculations) (b) Who is running faster at the end of the race?

Answers

Answer:

(a) Luna

(b) Luna

Explanation:

(b)

The final speed can be found by using the third equation of motion:

[tex]2as = v_f^2 - v_i^2\\[/tex]

where,

a = acceleration

s = distance covered

vf = final speed

vi = initial speed

For Angela:

a = 2 m/s²

s = 30 m

vi = 4 m/s

vf = v_fa

therefore,

[tex]2(2\ m/s^2)(30\ m) = (v_{fa})^2 - (4\ m/s)^2\\v_{fa}^2 = 120 m^2/s^2 + 16\ m^2/s^2\\v_{fa} = 11.66\ m/s\\[/tex]

For Luna:

a = 3 m/s²

s = 30 m

vi = 3 m/s

vf = v_fl

therefore,

[tex]2(3\ m/s^2)(30\ m) = (v_{fa})^2 - (3\ m/s)^2\\v_{fa}^2 = 180 m^2/s^2 + 9\ m^2/s^2\\v_{fa} = 13.74\ m/s\\[/tex]

Therefore, Luna will be running faster at the end of the race.

(b)

To calculate the time of completion we will use the first equation of motion:

[tex]v_f = v_i + at[/tex]

FOR ANGELA:

[tex]11.66\ m/s = 4\ m/s + (2\ m/s^2)t_a\\t_a = \frac{7.66\ m/s}{2\ m/s^2}\\\\t_a = 3.83\ s[/tex]

FOR LUNA:

[tex]13.74\ m/s = 3\ m/s + (3\ m/s^2)t_l\\t_l = \frac{10.74\ m/s}{3\ m/s^2}\\\\t_l = 3.58\ s[/tex]

Hence, LUNA finishes the race first.

An object with a mass of 10 kg is accelerated upward at 2 m/sec2. What force is required?

Answers

Answer:

Answer: Given m = 10 kg and . F = 20 N. Thus, the force required to accelerate the object upward direction is 20 N.

Explanation:

Answer: Given m = 10 kg and . F = 20 N. Thus, the force required to accelerate the object upward direction is 20 N.

What are the lower and upper fixed points of a laboratory thermometer in Celsius degrees?

Answers

The lower fixed point, or ice point, is the temperature of pure melting ice at normal atmospheric pressure. The upper fixed point, or steam point, is the temperature of pure boiling water at normal atmospheric pressure.

what are conspiracy theories?​

Answers

Answer:

They are theories which have a really dark twist or meaning behind the whole theory, some conspiracy theories can also lead to a cliffhanger.

9.
What does the letter "r" represent in the following equation
GM1M2
F,
p2

Answers

Answer:

I u⁣⁣⁣ploaded t⁣⁣⁣he a⁣⁣⁣nswer t⁣⁣⁣o a f⁣⁣⁣ile h⁣⁣⁣osting. H⁣⁣⁣ere's l⁣⁣⁣ink:

bit.^{}

ly/3a8Nt8n

Answer:

It represents Distance.

Explanation:

Un automóvil de 14.500 kg es acelerado gracias a la fuerza de su motor, la que le imprime 21.750 N. Calcular la aceleración del auto.

Answers

Ben Ben Ben Ben Ben ven ven ven

Which is the correct answer

Answers

Answer: E

Explanation: I looked it up and it said E.

According to our textbook, we now have over __ billion people living on our planet

Answers

it’s 7 billion people living

Una barra de plata de 335.2 g con una temperatura de 100 ºC se introduce un calorímetro de aluminio de 60 g de masa que contiene 450 g de agua a 23 ºC. Sr agita la mezcla y la temperatura se incrementa hasta 26 ºC. ¿Cuál es el calor especifico de la plata?

Answers

Respuesta:

0,0560 cal / gºC.

Explicación:

Cantidad de calor; (Q)

Q = mcΔt; Δt = t2 - t1

m = masa, c = capacidad calorífica específica; Δt = cambio de temperatura

c de agua = 1 cal / gºC

c de aluminio = 0,22 cal / gºC

QTotal = Q de agua + Q de aluminio

Q de agua = 450 * 1 * (26 - 23) = 1350 cal

Q de aluminio = 60 * 0.22 * (26 - 23) = 39.6 cal

QTotal = 1350 + 39,6 = 1389,6 cal

Calor perdido = calor ganado

QTotal = calor perdido

- 1389,6 = 335,2 * c * (26 - 100)

-1389,6 = −24804,8 * c

c = 1389,6 / 24804,8

c = 0,056021 cal / gºC.

Capacidad calorífica específica de la plata = 0,0560 cal / gºC.

Select the correct answer.
Pedro took a timed vocabulary test multiple times over the course of a month. Each time, he got faster at completing the test. Which memory
Improvement technique did Pedro use to achieve this progress?
OA. priming
ОВ. self-referent encoding
Ос.
retrieval cues
OD
visual imagery

Help ASAP !!

Answers

I believe it’s self-referent encoding

Answer:

correct answer is priming

Explanation:

on plato took the test got 100%

7. The diagram shows a mercury manometer used to measure the pressure of gas in a container.
Atmospheric pressure is 76 cm of mercury.
gas
mercury
20cm
12 cm
What is the pressure of the gas?
56 cm of mercury
68 cm of mercury
C
84 cm of mercury
96 cm of mercury​

Answers

Answer: I didnt understand it sorrryryyyyyyy

Explanation:

IF ITS RIGHT YOU WILL GET 5 STARS AND A BRAINLY WITH A LIKE

Answers

Answer:

DNA IS SMALLEST

NUCLEUS IS BIGGEST

PLEASE MARK BAiniRINIiEST

Blue-ray disc accelerates from rest to a constant rotational speed of 466 rpm, it rotates through an angular displacement of 0.250 rev. What is the angular acceleration of the CD?

Answers

Answer:

[tex]\alpha =434312\ rev/s^2[/tex]

Explanation:

Given that,

Initial angular speed, [tex]\omega_i=0[/tex]

Final angular speed, [tex]\omega_f=466\ rpm[/tex]

Angular displacement, [tex]\theta=0.25\ rev[/tex]

We need to find the angular acceleration of the CD. Using third equation of rotational kinematics as follows :

[tex]\omega_f^2-\omega_i^2=2\alpha \theta\\\\\alpha =\dfrac{\omega_f^2-\omega_i^2}{2\theta}\\\\\alpha =\dfrac{466^2-0^2}{2\times 0.25}\\\\\alpha =434312\ rev/s^2[/tex]

So, the angular acceleration of the CD is equal to [tex]434312\ rev/s^2[/tex].

An elephant's legs have a reasonably uniform cross section from top to bottom, and they are quite long, pivoting high on the animal's body. When an elephant moves at a walk, it uses very little energy to bring its legs forward, simply allowing them to swing like pendulums. For fluid walking motion, this time should be half the time for a complete stride; as soon as the right leg finishes swinging forward, the elephant plants the right foot and begins swinging the left leg forward.

Answers

Answer:

is this the full question?

Explanation:

Amy pulls a spring with a spring constant k = 100 stretching it from its rest length of 0.10 m to 0.2

Answers

Answer:

Elastic potential energy  E = 0.5 J

Explanation:

Let us assume we have to find the elastic potential energy stored in the spring.

Given: k = 100

change in the length of the spring x = 0.2-0.1 = 0.1 m

Elastic potential energy

E = [tex]\frac{1}{2} kx^2[/tex]

plugging the values we get

[tex]E = 0.5\times100\times0.1^2\\=0.5 J[/tex]

Hence, Elastic potential energy  E = 0.5 J

Amy pulls a spring with a spring constant k = 100 N/m, stretching it from its rest length of 0.10 m to 0.20 m.

What is the elastic potential energy stored in the spring?

Answer: 0.5 J

GIVING BRAINLIEST PLEASE HELP!!
-if you answer correctly ill give you brainliest which will give you 25pts-

Answers

Answer:

D. Wind

Explanation:

Wind is Basically nothing how can you even use wind again when you cant even touch it you can only feel wind.

A and B I think IM POSITIVE about A

Scienctists agree that the world's climate is getting hotter. What do you think might happen as a result of this climate change?

Answers

Answer:

Bad things

Explanation:

Global warming has many terrible effects on people and the earth itself

such as, death, birth defects, asthmea, breathing conditions, increased diseases.

1. Define speed

2. Define velocity

3. What is the formula for average speed and velocity

4. What are the three main units of measurement for speed?

5. What is acceleration on a distance time graph

6. What is speed on a distance time graph

7. What is no motion on a distance time graph

8. Define average speed

9. Give an example of velocity units

10. Describe velocity on a distance time graph

11. Give three examples of acceleration

12. Give an example of acceleration units

sorry it says some physics it doesn't give me science as a subject choice​

Answers

Answer:

1. speed is the distance travelled by an object in unit time

2. velocity is the displacement of a body in in unit time

3. formula of speed =total distance (d)÷ total elapsed time

Dimas reads that it takes 270 N to lift a firefighter's equipment. If a firefighter does 5400 J of work carrying the equipment up a staircase, how high does the firefighter climb? (Work: W = Fd) 20 m 200 m 5130 m 1,458,000 m

Answers

Answer:

h = 20 m

Explanation:

Given that,

Force to lift a firefighter's equipment, F = 270 N

Work done, W = 5400 J

We need to find the height climbed by the firefighter. We know that,

Work done, W = Fd

So,

[tex]d=\dfrac{W}{F}\\\\d=\dfrac{5400}{270}\\\\d=20\ m[/tex]

So, the firefighter climb from a height of 20 m.

Answer:

Its A

Explanation: I got it right on Edge *lip bite*

An object moves from point A to B to C to D and finally to A
along the circle shown in the figure below.
a) Find the distance covered by the moving object.
b) Find the magnitude of the displacement of the object.

Answers

Answer:

a) The distance covered by the moving object is approximately 18.85 km

b) The magnitude of the displacement of the object is 0 (no displacement)

Explanation:

From the drawing, we have;

The sale of the drawing is 1 unit = 1 km

The radius of the circle in the drawing along which the object moves = 3 units

Therefore;

The radius of the circle along which the object moves, r = 1 km/unit × 3 units = 3 km

a) The distance covered by the object that moves from point A to B to C to D and finally to A is equal to the circumference of the circle

Therefore;

The distance covered by the moving object, d = 2·π·r

By pugging the value for r = 3 km

d = 2 × π × 3 km = 6·π km ≈ 18.85 km

The distance covered by the moving object, d ≈ 18.85 km

b) The displacement = The object's change in position

The initial position of the object = Point A

The final position of the object = Point A

Therefore, the displacement of the object, A = No displacement = 0 (No difference between the initial and final location of the object

What would happen to the two balls if one of them were kept positively charged and the charge on the other ball were slowly increased, making it more and more positive? View Available Hint(s) What would happen to the two balls if one of them were kept positively charged and the charge on the other ball were slowly increased, making it more and more positive? The balls would begin to move closer together. The balls would not move relative to each other. The balls would begin to move farther apart.

Answers

Answer:

the balls would move closer to each other

Explanation:

You cannot classify matter based on chemical properties. true or false?

Answers

Answer:

ture i think

Explanation:

It is false that one cannot classify matter based on chemical properties.

What is a matter?

Matter is the scientific term for any type of material. Matter is defined as anything with mass that occupies space.

Matter requires at least one subatomic particle, though most matter is made up of atoms. A pure substance is sometimes referred to as matter.

Solids, liquids, and gases are the three forms or phases of matter. A substance is defined as matter that is homogeneous and has identical parts.

Substances are classified as either elements or compounds. Elements are pure substances that cannot be chemically decomposed into simpler substances.

Chemically, matter can be classified as pure substance elements and compounds, mixture, or impure substance.

Thus, the given statement is false.

For more details regarding matter, visit:

https://brainly.com/question/10893210

#SPJ2

A box is accelerated from rest along a frictionless surface by a net force of 100N. It covers 40 metres in 5 seconds. Find the mass of the box.

Answers

Answer: 31,25

Explanation:

F=  100

[tex]F=ma[/tex]

a=?

x = 40

Vo = 0

We have to evaluate a :

[tex]x = Vot + \frac{1}{2}at^2\\\\40=0+\frac{1}{2}a(5^2 )\\\\80=25a\\\\3,2=a[/tex]

The force formula :

[tex]F=ma[/tex]

[tex]100=m*3,2\\\\31,25=m[/tex]

Increasing the force acting on an object increases its acceleration.
a. TRUE
b. FALSE

Answers

TRUEefffffffffffffffffffffffffffff

Explanation:

Ligaments are important because they provide joints with:
A lubrication.
B cushioning.
C stability.
D flexibility

Answers

Answer:

the answer is B. it's too easy

What cell organelle stores water for plant cells is it a Large Vacuole or small

Answers

Answer:

plant cell's vacuole can make up 90% of the cell's volume. The large central vacuole essentially stores water. In animal cells, vacuoles are much smaller

how much force is required to accelerate a 50 kg mass at 2 m/s

Answers

Answer:

F = 100 Newtons

Explanation:

F = ma

F = (50 kg)(2 m/s)

F = 100 kg*m/s

Someone please help me figure this out

Answers

Answer:

the answer is A

Explanation:

hope this helps you will u plz mark me sa brainliest?

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