True or False? The most reactive metals are found in Period 1 of the Periodic Table.
Hydrogen is a very reactive gas, and the alkali metals are even more reactive. In fact, they are the most reactive metals and, along with the elements in group 17, are the most reactive of all elements.
Answer:
Explanation:
true
If an atom becomes an ion by loosing 4 electrons, what will the net charge of the atom be? pls hurry NO LINKS!
1) -1.6 x 10^-19 C
2) - 3.2 x 10^-19 C
3) - 4.8 x 10^-19 C
4) -6.4 x 10^-19 C
Answer:
1) - 35
2) - 35
3) - 67
4) - 83
Around the turn of the twentieth century, inventor Robert Shuman was engineering products that used energy directly from the Sun to power motors and farms. He stated that coal and oil would eventually run out and that humans needed to learn how to use the more-abundant energy resource of the Sun. During which stage of technological design did Shuman identify that using oil and coal would be a problem? first second third fourth
Answer: First stage
Explanation:
The four stages of technological design include:
• identifying a problem.
• Designing a solution.
• Implement, build, and test the design.
• Determine if solution met the need.
In this scenario, Robert Shuman identified the problem. This was depicted as he stated that coal and oil would eventually run out and that humans needed to learn how to use the more-abundant energy resource of the Sun,
Which of the following has greater kinetic energy?
(a). A 10 g meteor hurtling (Moving at greater speed) through the Earth’s atmosphere at 5.0 km s−1. (b). A 65 kg jogger running at 5.0 m s−1.
please help me
Which explanation best describes a wave?
A.
a disturbance that travels through a medium with a transfer of energy and matter
B.
a disturbance that travels through a medium without a transfer of energy and matter
C.
a disturbance that travels through a medium with a transfer of energy and without a transfer of matter
D.
a disturbance that travels through a medium with a transfer of matter and without a transfer of energy
E.
a disturbance that travels only in the absence of a material medium
Answer:
C. a disturbance that travels through a medium with a transfer of energy and without a transfer of matter
Explanation:
A wave is any disturbance that transfers energy from one location to the other via a substance called medium. It is important to note that a wave only conveys energy and not matter. For example, sound wave is a type of wave that carries sound energy from one place to another via mediums such as water, air etc.
Hence, according to this question, a wave can be described as a disturbance that travels through a medium with a transfer of energy and WITHOUT A TRANSFER OF MATTER.
newton's second law states that when a net force acts on an object, it accelerates it.Explain how it would be possible for two or more forces to act on object without accelerating it
Answer:
See Explanation
Explanation:
According to Newton's second law of motion, the acceleration of a body is proportional to the net external force that acts on the body.
A body accelerated when it is acted upon by an unbalanced net external force.
When the external forces acting on a body are balanced, the effect of each force is cancelled by the other hence the body is not accelerated according to Newton's second law.
What object currently has the most gravitational potential energy?
A, B, C, or D
Answer:
A
Explanation:
this because
gravitational potential energy = mass x height x gravitational field strength
so let's assume mass is 2 kg and gravitational field strength is 10 N /kg
so when height is very low, take it as 3 m
gravitational potential energy= 2 x 3 x 10 = 60 j
but when height is 6m
gravitational potential energy = 2 x 6 x 10 = 120 j
so when the height is the greatest, the gravitational potential energy is the highest
so A is the heighest so it has the highest gravitational potential energy.
hope this helps
please mark it brainliest :D
You’ve probably seen how the surface of a tire can partially melt and leave a mark on the road when a car’s brakes are applied really hard. Explain why the surface of the tire melts.
Answer:
The friction of braking heats up the tire and the road. The temperature is so high that it reaches the melting point of the rubber in the tire. The melting rubber is what leaves a mark on the road.
Explanation:
Answer:
the friction of braking heats up the tires and the road. then the temperature gets even hotter to the point where it melts the rubber.
Explanation:
this is my answer so be careful how you copy it, but you've got this guys schools is almost out stay strong an have fun and be safe this summer keep pushing <33.
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- Jason Edwards 5/15/23
Gravity is the force that objects exert on each other because of their masses. The strength of the gravitational force between two objects
depends on two factors, mass and distance. How is gravity related to mass and distance? Choose ALL the statements that apply.
If one of the masses is doubled, the force of gravity between the objects is doubled.
As distance between the objects increases, the force of gravity decreases.
As distance between the objects increases, the force of gravity increases.
The more mass two objects have, the less the force of gravity the masses exert on each other
Greater mass results in greater force.
Explanation:
Newton's law of universal gravitation states that the force of gravity affects everything with mass in the universe. Newton's law also states that the strength of gravity between any two objects depends on the masses of the objects and the distance between them
Two asteroids are located a certain distance away from each other. They have the same mass . The gravitational force of attraction is f . If the mass of one of the asteroids is doubled, how will the gravitational force be affected
Answer:
F' = 2F
Explanation:
The gravitational force of attraction between asteroids is given by Newton's Law of Gravitation:
[tex]F = \frac{Gm_1m_2}{r^2}[/tex]
where,
F = Force
G = Universal Gravitational Constant
m₁ = m₂ = m = mass of each asteroid
r = distance between asteroids
Therefore,
[tex]F = \frac{Gm^2}{r^2}[/tex] --------------------- eq(1)
Now, if we double the mass of one asteroid:
[tex]F' = \frac{G(2m^2)}{r^2} \\\\F' = 2\frac{Gm^2}{r^2}[/tex]
using equation (1):
F' = 2F
Which of these planets is the odd one out based on their physical features?
a. Mars
b. Uranus
c. Jupiter
d. Neptune
Answer:
mars
Explanation:
the planet that is the odd is Mars
A middle-A tuning fork vibrates with a frequency f of 440 hertz (cycles per second). You strike a middle-A tuning fork with a force that produces a maximum pressure of 5 pascals. Write a sine model that gives the pressure P as a function of the time t (in seconds).A middle-A tuning fork vibrates with a frequency f of 440 hertz (cycles per second). You strike a middle-A tuning fork with a force that produces a maximum pressure of 5 pascals. Write a sine model that gives the pressure P as a function of the time t (in seconds).
Answer:
P = 5sin(880πt)
Explanation:
We write the pressure in the form P = Asin2πft where A = amplitude of pressure, f = frequency of vibration and t = time.
Now, striking the middle-A tuning fork with a force that produces a maximum pressure of 5 pascals implies A = 5 Pa.
Also, the frequency of vibration is 440 hertz. So, f = 440Hz
Thus, P = Asin2πft
P = 5sin2π(440)t
P = 5sin(880πt)
A ball rolled 12.0 m [E] in 10.0 s, hit an obstacle, and rolled straight back. After the collision, the ball rolled 8.00 m [W] in 6.00 s. What was the average velocity of the ball?
Answer:
the average velocity of the ball is 5 m/s.
Explanation:
Given;
initial position of the ball, x₁ = 12 m East
final position of the ball, x₂ = 8 m West
initial time of motion, t₁ = 10.0 s
final time of motion, t₂ = 6.0 s
The average velocity is calculated as follows;
[tex]v = \frac{\Delta x}{\Delta t} = \frac{x_1 \ - \ x_2}{t_1 \ - \ t_2}[/tex]
let the Eastward direction be positive
Let the westward direction be negative
[tex]\frac{x_1 \ - \ x_2}{t_1 \ - \ t_2} = \frac{12 \ - \ (-8)}{10 -6}= \frac{20}{4} = 5 \ m/s[/tex]
Therefore, the average velocity of the ball is 5 m/s.
You have a grindstone (a disk) that is 98.0 kg, has a 0.335-m radius, and is turning at 100 rpm, and you press a steel axe against it with a radial force of 23.6 N. Assuming the kinetic coefficient of friction between steel and stone is 0.192, calculate the angular acceleration of the grindstone.
Answer:
[tex]a=0.276[/tex]
Explanation:
From the question we are told that:
Mass [tex]m=98.kg[/tex]
Radius [tex]r=0.335[/tex]
Angular velocity [tex]\omega=100rpm[/tex]
Radial force of [tex]F_r=23.6 N.[/tex]
Kinetic coefficient of friction [tex]\mu=0.192[/tex]
Generally the equation for Kinetic Force is mathematically given by
[tex]F_k=\mu.F_r[/tex]
[tex]F_k=0.192*23.6[/tex]
[tex]F_k=4.5312[/tex]
Generally the equation for Torque on Center is mathematically given by
[tex]Ia=f_k*r[/tex]
Where
[tex]I=\frac{Mr^2}{2}[/tex]
Therefore
[tex]a=\frac{2f_k}{Mr}[/tex]
[tex]a=\frac{2*4.5312}{98*0.335}[/tex]
[tex]a=0.276[/tex]
Therefore Angular acceleration of the grindstone is
[tex]a=0.276[/tex]
¿Cuál es la intensidad del campo eléctrico a una distancia de 2 m de una carga de -12μC? *
Answer:
Una secadora de cabello tiene una resistencia de 10Ω al circular una corriente de 6 Amperes, si está conectado a una diferencia de potencial de 120 V, durante 18 minutos ¿Qué cantidUna secadora de cabello tiene una resistencia de 10Ω al circular una corriente de 6 Amperes, si está conectado a una diferencia de potencial de 120 V, durante 18 minutos ¿Qué cantidad de calor produce?, expresado en caloríasad de calor produce?, expresado en calorías
17. ____ Objects with more mass have
a. more gravity b. less gravity
c. more acceleration
d. less inerties
a. more gravity
This is the answer.
A bmw 23 goes from 0 to 60 miles per hour in 5 seconds . It is also used in the second law of motion
Answer:
Acceleration = 5.3645 m/s²
Explanation:
Given the following data;
Initial velocity, u = 0mph
Final velocity, v = 60 mph
Time, t = 5 seconds
To find the acceleration (also used in the second law of motion), we would use the following formula;
A = (v - u)/t
Conversion:
Miles per hour to meters per seconds;
0 mph = 0 mps
1 mph = 0.44704 mps
60 mph = 60 * 0.44704 = 26.8224 mps
Next, we find the acceleration;
Acceleration = (26.8224 - 0)/5
Acceleration = 26.8224/5
Acceleration = 5.3645 m/s²
temporary magnets are made from soft iron true or false
Answer:
temporary iron r made up of soft iron its " true.."
stay safe healthy and happy.resistance question for physics!!!
Answer:
22
Explanation:
all the resistance numbers added together 2.0+6.0+10.0+4.0
resistance formula : v bettary = v1 + v2 + v3 ....
Which property determines and Adams ability to attract electrons shared in a chemical bond?
Answer:
Electronegativity
Explanation:
Answer:
The property that determines an atom;s ability to attract electrons shared in a chemical bond is electronegativity.
Explanation:
Hope you have a great day :)
Electrons made to vibrate to and fro at a few hundred thousand hertz emit radio waves. What class of waves is emitted from electron vibrations of a few million billion hertz
Answer:
this frequency is in the near UV range
Explanation:
The accelerated movement of a charge creates an electromagnetic wave, the speed of the wave is the speed of light
c = λ f
the emitted frequency is f = 10⁶ 10⁹ Hz = 10¹⁵5 hz,
light of this frequency is in the near UV range
What type of electromagnetic wave has a frequency of around 1012 Hz?
before each item.
1. Which of the following refers to chemical digestion?
A. Chewing of food B.. Grinding of food C. Tearing of food D. Amylase in the saliva
2. In what organ most of the absorption process happen?
A. Stomach B. Small intestine C. Large intestine D. Esophagus
3. It is a digestive disorder wherein the body has the inability to digest sugar?
A. Gastritis B. Lactose intolerance
C. Diarrhea D. Peptic ulcer
4. The following are part of the digestion process EXCEPT
A. ingestion B. assimilation
C. excretion D. respiration
5. It helps to moisten the food and contains the enzyme amylase.
A. Saliva
B. Stomach C. Mouth D. Teeth
6. It is a process of taking in digested food nutrients into the cell by providing new protoplasm and energy
needed during the cell activities.
A. Ingestion B. assimilation C. Absorption D. Excretion
7. What causes constipation?
A. Lack of fiber in the body B. Uncontrolled growth of abnormal cells
C. Lack of enzyme lactase D. Excessive consumption of coffee and acidic drinks
8. The nutrients from the digested food are being absorbed by the following processes except
A. passive diffusion B. facilitated diffusion C. active transport D. ingestion
9. It is the organ that is responsible for reabsorbing water and minerals that are not digested in the small
intestine.
A. Stomach B. Large intestine C. Small intestine
D. Esophagus
10. The following are the reasons why digested food should be assimilated into the cell EXCEPT
A. they are converted into protoplasm. C. they provide energy needed in cell activities
B. they are needed to store fats. D. they are converted to build cell membranes
11. What is the best treatment for a person who suffers lactose intolerance?
A. Take antibiotics
B. Balanced diet
C. Take lactase supplements before eating food contains dairy D. Practice healthy lifestyle
12. What happen during the assimilation process?
A. Absorbed nutrients are delivered into the cell
B. Breaking down of food into tiny pieces
C. Elimination of waste product of the digestion process D. Absorption of nutrients from the digested food
13. How does the enzyme amylase help in the absorption of nutrients?
A. It helps in the digestion of proteins.
B. It helps in the digestion of fats.
C. It helps in the digestion of carbohydrates. D. It helps in the digestion of lipids.
14. It is characterized as loose bowel caused by an infection of bacteria that we get from the food we eat.
D. GERD
A. Diarrhea
C. Gastritis
B. Peptic Ulcer
15. How saliva helps in the digestion process?
A. It reabsorbs nutrients from the food we eat.
B. It contains the enzyme amylase that helps in the digestion of starch.
C. It absorbs nutrients and distribute it in the bloodstream.
D. All of the above
16. How colon cancers can be treated?
B. By exercising
A. By eating foods rich in fiber
D. By undergoing surgeries.
g C. By taking lactase supplements
Answer:
1:D
2:B
3:B
4:D
5:A
13:A
14:A
15:B
16:A
7:A
9:B
8:B
11:C
12:A
Explanation:
Sorry for incomplete answers