Answer:
d
Explanation:
When a teacher mixed zinc (Zn) with hydrogen chloride (HCl), one or more new substances formed. Hence, option (d) is correct.
What is chemical reaction?A chemical reaction is a procedure that causes one group of chemical components to change chemically into another.
Chemical reactions, which can frequently be described by a chemical equation, traditionally include changes that only affect the locations of electrons in the formation and dissolution of chemical bonds between atoms, with no change to the nuclei (no change to the elements present).
The study of chemical processes involving unstable and radioactive elements, where both electronic and nuclear changes may take place, is known as nuclear chemistry.
When the teacher mixed zinc (Zn) with hydrogen chloride (HCl), chemical reaction happens and more than one new substances formed.
2Zn + 2HCl → 2ZnCl + H₂
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2. Elements in the same group have similar properties because they have O the same number of protons O the same number of valence electrons O the same number of energy levels with electrons O the same total number of electrons
If a bullet with an acceleration of 1.5 m/s2 takes 2 seconds to leave the muzzle of a rifle (starts at rest), what was the length of the rifles barrel?
Answer:
The length is [tex]D =3 \ m [/tex]
Explanation:
The velocity of the bullet is mathematically evaluated as
[tex]v = a * t [/tex]
=> [tex]v = 1.5 * 2 [/tex]
=> [tex]v = 3 \ m/s [/tex]
Now from kinematic equation
[tex]v^2 = u^2 + 2* a * D[/tex]
Here D is the length of the barrel and u = 0 m/s
So
[tex]3^2 = 0 + 2* 1.5 * D[/tex]
[tex]D = \frac{9}{3} [/tex]
[tex]D =3 \ m [/tex]
A man is paddling a kayak with the force of 254 N, at an acceleration of 1.39 m/s2. If the kayak weighs 30 kg, what is the mass of the man?
17. The weight of an object on a given planet can be found by using the formula W = mg, where W is the weight of the object measured in newtons, m is the mass of the object measured in kilograms, and g is the acceleration due to gravity on the planet measured in meters per second squared. An object on Earth has a weight of 150 newtons. If the acceleration on earth is 9.8 m/sec?, on Mercury it is 3.6, on Saturn it is 11.1 and on Jupiter it is 26, on which planet would the same object have an approximate weight of 170 newtons?
Answer:
Saturn
Explanation:
W = mg
150 N = m (9.8 m/s²)
m = 15.3 kg
W = mg
170 N = (15.3 kg) g
g = 11.1 m/s²
The planet is Saturn.
A toy car has an initial velocity of 5 m/s and experiences a constant acceleration of 2.0 m/s2. How far does the toy car travel before reaching a velocity of 11 m/s? Write your answer to one decimal place.
Answer:t would be 17 m/s
If we use V2 = V1 + a*t
Sub in 5 for v1
2m/s*2 for a
And
6 for t
That should give you the answer.
Write a hypothesis about the effect of the fan speed on the acceleration of the cart. Use the "if . . . then . . . because . . .” format and be sure to answer the lesson question: "How does an object's position and velocity change as the object accelerates?”
Answer:
If the fan speed increases, then the acceleration increases because a greater fan speed supplies more energy to move the cart.
Explanation:
Edge
A 0,34-kg volleyball is flying west at 1,98 m/s when it strikes a stationary 0,60-kg basketball dead centre. The volleyball rebounds east at 0,79 m/s. What will be the velocity of the basketball immediately after impact? Choose the east direction as positive.
Explanation:
use the law of conservation of momentum
M1U1+M2U2=M1V1+M2V2
m-mass
u-initial velocity
v-final velocity
1-volleyball
2-basket ball dead center
so using the above formula
0.34×1.98+0.64×0=0.34×0.79+0.64×V2
to get
0.6732+0 = 0.2686+0.64V2
0.4046=0.64V2
divide both sides by 0.64 to get V2 which is the final velocity of basketball
0.6322m/s=V2
The final velocity of the basketball after the impact is 1.643 m/s west.
The given parameters;
mass of the volleyball, m = 0.34 kginitial velocity of the volleyball, u₁ = 1.98 m/smass of the stationary basketball, m₂ = 0.6 kgfinal velocity of the volleyball, v₁ = 0.79 m/sThe final velocity of the basketball after the impact is calculated by applying the principle of conservation of linear momentum;
m₁u₁ + m₂u₂ = m₁v₁ + m₂v₂
0.34(-1.98) + 0.6(0) = 0.79(0.34) + 0.6(v₂)
-0.673 = 0.316 + 0.6v₂
-0.989 = 0.6v₂
[tex]v_2 = \frac{- 0.989}{0.6} \\\\v_2 = -1.643 \ m/s\\\\v_2 = 1.643 \ m/s \ west[/tex]
Thus, the final velocity of the basketball after the impact is 1.643 m/s west.
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A student clicks the mouse at time intervals of 1.60, 2.10, 2.40, 1.90 what is the standard deviation of this dataset.
A. 0.22
B. 0.25
C. 0.29
D. 0.58
Explain why there is a delay between the arrival of the sound transmitted through the steel pipe and the sound transmitted by the air in the pipe.
Answer: RATE ME AND MAKE ME BRAININESS AND THANK ME
Explanation:Sound waves are pressure waves that travel through Earth's crust, water bodies, and atmosphere. Natural sound frequencies specify the frequency attributes of sound waves that will efficiently induce vibration in a body (e.g., the tympanic membrane of the ear) or that naturally result from the vibration of that body.
Sound waves can potentiate or cancel in accord with the principle of superposition and whether they are in phase or out of phase with each other. Waves of all forms can undergo constructive or destructive interference. Sound waves also exhibit Doppler shifts—an apparent change in frequency due to relative motion between the source of sound emission and the receiving point. When sound waves move toward an observer the Doppler effect shifts observed frequencies higher. When sound waves move away from an observer the Doppler effect shifted observed frequencies lower. The Doppler effect is commonly and easily observed in the passage of planes, trains, and automobiles.
The speed of propagation of a sound wave is dependent upon the density of the medium of transmission. Weather conditions (e.g., temperature , pressure, humidity , etc.) and certain geophysical and topographical features (e.g., mountains or hills) can obstruct sound transmission. The alteration of sound waves by commonly encountered meteorological conditions is generally negligible except when the sound waves propagate over long distances or emanate from a high frequency source. In the extreme cases, atmospheric conditions can bend or alter sound wave transmission.
The speed of sound in steel is about 17 times as fast as it's speed in air.
Naturally, when a sound starts out at one end of a pipe, it reaches the other end thru the steel before it reaches the other end thru the air in the pipe.
The longer the pipe is, the longer will be the delay between the arrival of the two sounds at the other end.
A microwave has a _________ wavelength and a ________ frequency than a radio wave
Answer:
A microwave has a shorter wavelength and a higher frequency than a radio wave.
Explanation:
On the electromagnetic spectrum, radio waves have the absolute lowest frequency, as well as the longest wavelength; therefore, any wave on the electromagnetic spectrum would have a shorter wavelength and higher frequency than a radio wave.
Bile helps in the digestion of —————-
Answer:
Bile helps in the digestion of fats
The word “cumulative” means that something builds on itself. Which example best shows how scientific knowledge is cumulative? A. Watson and Crick worked together to come up with the model of DNA. B. Kepler based his laws of planetary motions off of Newton’s law of gravity. C. Hardy and Weinberg independently came up with a population equation. D. Darwin and his grandfather both worked on the ideas of survivability.
Answer:
B
Explanation:
Kepler embodied cummulative knowledge(succession).
Answer:
your answer is B
Explanation:
i got it right lovely's
who is good at physics pls come here and help me!!1
Answer:
It wont change its mass
A
Explanation:
Convert 10,000 inches to miles.
A truck covered 2/7 of a journey at an average speed of 40
mph. Then, it covered the remaining 200 miles at another
average speed. If the average for the whole journey was 35
mph, what was the amount of time for the whole journey?
h
Answer:8h
Explanation:
Answer: 8 h
Explanation:
I got it right
Academic integrity only relates to a. Online learning c. Instances of cheating b. All subjects d. Any academic situation I give brainliness
Answer:
answer is d.
Explanation:
are you going to mark me brainlinessist
A 3.00 kg mass is traveling at an initial speed of 25.0 m/s. What is the
magnitude of the force required to bring the mass to rest in a distance of 62.5m?
Answer:
The magnitude of the force required to bring the mass to rest is 15 N.
Explanation:
Given;
mass, m = 3 .00 kg
initial speed of the mass, u = 25 m/s
distance traveled by the mass, d = 62.5 m
The acceleration of the mass is given as;
v² = u² + 2ad
at the maximum distance of 62.5 m, the final velocity of the mass = 0
0 = u² + 2ad
-2ad = u²
-a = u²/2d
-a = (25)² / (2 x 62.5)
-a = 5
a = -5 m/s²
the magnitude of the acceleration = 5 m/s²
Apply Newton's second law of motion;
F = ma
F = 3 x 5
F = 15 N
Therefore, the magnitude of the force required to bring the mass to rest is 15 N.
Who is the father of physics?
Answer:sir Isaac Newton is known as the father of physics.
Explanation:
A student walks to the right 25-m along the 800 hall in 15-s. They turn around and walk 15-m to the left in 8.0-s. Calculate the average speed and the average velocity
Answer:
Explanation:
Total distance covered = 25 + 15 = 40 m
Total time = 15 + 8 = 23 s
Average speed = total distance covered / total time
= 40 / 23
= 1.74 m / s
Total displacement = 25 - 15 = 10 m
Total time = 15 + 8 = 23 s
Average velocity = total displacement / total time
= 10 / 23
= .434 m / s to the right .
The average speed of the student is approximately 1.74 m/s, and the average velocity is approximately -1.74 m/s (to the left).
Given:
Distance to the right = 25 m
Time taken to the right = 15 s
Distance to the left = 15 m
Time is taken to the left = 8.0 s
To calculate the average speed and average velocity, we need to use the following formulas:
Average speed = Total distance traveled ÷ Total time taken
Average velocity = Displacement ÷ Total time taken
Calculate the total distance traveled:
Total distance = Distance to the right + Distance to the left
Total distance = 25 + 15 = 40 m
Calculate the total time taken:
Total time = Time taken to the right + Time taken to the left
Total time = 15 + 8.0 = 23 s
Calculate the average speed:
Average speed = Total distance ÷ Total time
Average speed = 40 ÷ 23 = 1.74 m/s
Calculate the displacement:
Displacement = Final position - Initial position
Displacement = (-15 ) - 25 = -40 m
Calculate the average velocity:
Average velocity = Displacement ÷ Total time
Average velocity = -40 ÷ 23 ≈ -1.74 m/s
So, the average speed of the student is approximately 1.74 m/s, and the average velocity is approximately -1.74 m/s (to the left). The negative sign in the average velocity indicates that the student's net direction is to the left.
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hey can anyone help me out in dis pls!
Answer:
D
Explanation:
Answer:it’s a
Explanation:
Describe current in terms of charge and electrons.
PLEASE HELP I WILL GIVE BRAINLIEST
Does the distance a person kicks a soccer ball
affect how well they will do on their math test?
Identify the independent and dependent
variable
Answer:
Independent variable: how far the soccer ball is kicked.
Dependent variable: how well the person does on their math test
Explanation:
The distance the ball is kicked is what the scientist can change. On the other hand, in this experiment, how well the person does on their test supposedly relies on how far the soccer ball is kicked.
Which statement describes a socialist government?
Answer:
Socialism is a political, social, economic philospohy. Socialist governtment is a form of governtment in which the means of production are owned by the government of the country.
Explanation:
(i thought you could find this in google)
Answer:
Socialism is a political, social, and economic philosophy encompassing a range of economic and social systems characterized by social ownership of the means of production. ... Social ownership can be public, collective, cooperative, or of equity. Socialism is an economic and political system. It is an economic theory of social organization. It states that the means of making, moving, and trading wealth should be owned or controlled by the workers. This means the money made belongs to the workers who make the products, instead of groups of private owners.Socialist government is a form of government in which the means of production are owned by the government of the country. Social systems in this form of government are the ones are divided into the market and the non market forms. The means of transportation are controlled by the government here.
What is the difference berween uniform velocity and non uniform velocity
Answer:
Uniform Velocity means in a certain limit a body is moving with same speed. And non- uniform Velocity happens when body is moving with different speed.
Explanation:
Answer:
Uniform Velocity means in a certain limit a body is moving with same speed. And non- uniform Velocity happens when body is moving with different speed.
Explanation:
Determine the vector sum of the displacements Δd1 = 2.4 m [32° S of W]; Δd2 = 1.6 m [S]; and Δd3 = 4.9 m [27° S of E].
Answer:
3.44 metres
Explanation:
To determine the vector sum of the displacements Δd1 = 2.4 m [32° S of W]; Δd2 = 1.6 m [S]; and Δd3 = 4.9 m [27° S of E], resolve the given parameters into x - component and y - component.
Resolving into x - component
- 2.4cos32 + 4.9cos27 = 2.3306
Resolving into y - component
- 2.4sin32 - 4.9sin27 - 1.6 = - 2.553
The vector sum of the displacement will be
Sqrt( 2.3^2 + 2.6^2) =
Sqrt ( 11.81)
3.44 m
Therefore, the vector sum of the displacements is 3.44 metres
Joelle is a manager at a construction company, and she is interested in the chemistry behind
the materials they use. She has begun studying the materials used to fill walls. She knows
that to keep the temperature inside a room steady the material must be a thermal insulator,
and she predicts that materials should not be acidic or else they would dissolve too easily in
water
Answer: C6H6
Explanation:
I did it and got it right
Answer:
Yes the answer is C6H6
Explanation:
I just took the test
Can some one help please i’m in danger !
Distance = Speed × Time
Answer:Level 1:The distance travelled during 5 hours = 0 × 5 = 0 km
Level 2:The distance travelled during 5 hours = 50 × 5 = 250 km
Level 3:The distance travelled during 5 hours = 60 × 5 = 300 km
Level 4:The distance travelled during 5 hours = 60 × 4 = 240 km
Where mud you be standing if the Sun appears to be directly overhead at noon
Answer:
A
Explanation:
a woman drops a rock from a bridge to the water 17.5 m below. with what speed does the rock strike the water?
a. 0 m/s
b. 18.5 m/s
c. 171m/s
d. 9.8 m/s
e. 17.5 m/s
Given :
Height from which rock is dropped, h = 17.5 m.
Initial velocity, u = 0 m/s.
To Find :
Speed does the rock strike the water.
Solution :
We know, by equation of motion :
[tex]v^2-u^2=2as[/tex] ......( 1 )
Here , a = g = 9.8 m/s² ( Acceleration due to gravity )
Putting all given values in 1 , we get :
[tex]v^2-u^2=2as\\\\v=\sqrt{2gh}\\\\v=\sqrt{2\times 9.8\times 17.5}\ m/s\\\\v=18.5\ m/s[/tex]
Therefore, speed with rock strike the water is 18.5 m/s.
Hence, this is the required solution.
Jennifer works for an automaker and tests the safety performance of cars. She watches a 2,000-kilogram car crash into a wall with a force of 30,000 newtons. What’s the acceleration of the car at impact? Use F = ma.
The answer is a = 15 m • s - 2.
Answer:
A
Explanation: