Answer;
Barium
Explanation;
Group 2 metals get more reactive as we go down the group. The alkaline earth metals are the elements in Group 2 of the Periodic Table: beryllium, magnesium, calcium, strontium, barium, and radium. alkaline earth metals have low melting points and low densities for metals.
The decrease in reactivity down the group can be explained by the increase in ease at losing two outer electrons as we descend the group. The loss of electrons becomes easier due to the decreasing ionization energy required. Ionization energy decreases due to extra shielding from inner shells and increase in distance from the nucleus.
Answer: The correct answer is Barium.
Explanation: We are given some elements which belong to group 2 of the periodic table. These elements are considered as metals.
Reactivity of metals are defined as the ability of a metal to loose electrons easily.
In a periodic table, as we move down the group, the ability to loose the electrons increases and as a result, the reactivity of elements increases.
From the given elements, the last element which belongs to group 2 is Barium.
Hence, the most reactive element is Barium.
A 3.0-kg block sits on top of a 5.0-kg block which is on a horizontal surface. The 5.0-kg block is pulled to the right with a force F⃗ as shown in the figure. The coefficient of static friction between all surfaces is 0.57 and the kinetic coefficient is 0.43. What is the minimum value of F needed to move the two blocks?
Final answer:
The minimum value of the force needed to move the two blocks is approximately 27.93 N.
Explanation:
To determine the minimum value of the force needed to move the two blocks, we need to consider the friction between the blocks and the surface. Since the coefficient of static friction is given, we can use it to find the maximum static friction force:
Fstatic_max = μstatic × N
where μstatic is the coefficient of static friction and N is the normal force. Since the 3.0-kg block is sitting on top of the 5.0-kg block, the normal force on the 5.0-kg block is equal to its weight:
N = m × g
where m is the mass of the 5.0-kg block and g is the acceleration due to gravity. Once the force F is greater than the maximum static friction force, the blocks will begin to move. The minimum value of F needed to move the two blocks is therefore equal to the maximum static friction force:
F = Fstatic_max
Substituting the given values, the equation becomes:
F = μstatic × (m × g)
Plugging in the values, we get:
F = 0.57 × (5.0 kg × 9.8 m/s²)
Simplifying, we find that the minimum value of F needed to move the two blocks is approximately 27.93 N.
the chart lists the masses of four balls that have the same momentum. Which correctly compares 2 of the balls
Answer:B : D
The correct answer would be B:The red ball has a greater velocity than the purple ball.
Hope this helped : )
Explanation:
Please help have no clue on this
IIn what form does the sun energy arrive on earth
Answer:
radiation
Explanation:
This is because sun energy travels in form of waves and thus doesn't require a medium to travel in
If you have a mineral sample with a volume of 4 ml and a mass of 20 grams , what is the density ?
The density of a mineral sample with a volume of 4 ml and a mass of 20 grams is 5 grams per milliliter (g/ml).
If you have a mineral sample with a volume of 4 ml and a mass of 20 grams, the density can be calculated using the formula:
Density = Mass / Volume
Substituting the given values into the formula, we get:
Density = 20 grams / 4 ml = 5 grams per milliliter (g/ml).
Which of these is an example of a physical change? Question options: wood decaying iron melting paper burning steel rusting
Final answer:
Iron melting is an example of a physical change because it involves a state change without altering the substance's chemical composition.
Explanation:
An example of a physical change from the options provided is iron melting. Physical changes are characterized by a change in the state or properties of matter without altering its chemical composition. When iron melts, it changes from solid to liquid, but the substance remains iron; its molecules are not changed. Other examples of physical changes might include boiling water, dissolving sugar in water, or breaking a mirror. Conversely, wood decaying, paper burning, and steel rusting involve chemical reactions that create new substances, thus, they are chemical changes.
all but one statement applies to electromagnetic radiation
Answer:
Its D can i get brainliest
Explanation:
What is chemical stimuli
HELP PLEASE ASAP!!!!
Which of the following terms describes how mountains form?
A: Gradually
B: Rapidly
C: Explosively
D: Destructively
Planets, stars, asteroids and other celestial bodies have generally round shapes. Some are ovals, others really bumpy circles, and some are a very squished oval. Why are none triangular or rectangular?
a track coach with a meter stick and a stopwatch is trying to determine if a student is walking with constant speed.he should...
What did early South American civilization do to promote farming
Discuss potential behavioral concerns for people should they travel to Mars.
The Answer above is Correct :)
if you were in a canoe on a calm lake and you threw a heavy stone into the water in front of you what would the canoe do
A- the canoe would move backward a bit
B- the canoe would move forward a bit
C- the canoe would move forward and keep going
D- the canoe would not move because it is too heavy
Answer: Option A: The canoe would move backward a bit.
Explanation:
Newton's third law of motion states that for every action there is equal and opposite reaction. This means when you threw a heavy stone in front of you, you applied a force. Equal and opposite force acted on the canoe and it moved backward a bit.
Hence, according to Newton's third law of motion, when you throw a heavy stone forward, and equal amount of force will push the canoe backwards.
Final answer:
In a canoe, throwing a heavy stone into the water away from you will cause the canoe to move backward a bit due to Newton's Third Law of Motion. This motion is equal and opposite to the force applied when throwing the stone. The principles of forces help understand canoeing strategies, as well as the motion and sinking of objects in water.
Explanation:
When you are in a canoe on a calm lake and throw a heavy stone into the water, what you're experiencing is an application of Newton's Third Law of Motion, which states that for every action, there is an equal and opposite reaction. So, if you throw the stone away from the canoe, the force of throwing the stone forward will produce a reactive force in the opposite direction, causing the canoe to move backward a bit, which corresponds with option A. This movement is temporary, and once the initial reactionary force dissipates, the canoe will stop moving backward unless other forces are at play.
Canoeing techniques also involve understanding the forces at play. When paddling a canoe upstream, staying near the shore is wise due to the slower water speeds caused by friction between the water and the riverbanks. Meanwhile, when canoeing downstream, it is often best to stay near the middle where the current is stronger and can assist in propelling you forward with less effort.
This understanding of forces also clarifies that the motion of objects, such as a stone thrown into water, can be influenced by factors like density and gravitational force, rather than only the force exerted by a throw. When a stone is placed in water, it sinks because the stone's density is greater than water's, leading to a gravitational force that exceeds the buoyant force on the object.
A small child gives a plastic frog a big push at the bottom of a slippery 2.0 meter long, 1.0 meter high ramp, starting it with a speed of 5.0 m/s. What is the frog's speed as it flies off the top of the ramp?
How would you calculate the spring constant of an unknown spring?
Final answer:
To find the spring constant, apply Hooke's Law using the formula F = kx, where F is force due to gravity (mg), and x is the stretch distance. For a 10.0 kg mass stretching the spring 8.00 cm, the spring constant is calculated as 1225 N/m.
Explanation:
To calculate the spring constant (k) of a spring, you can use Hooke's Law, which is F = kx, where F is the force applied to the spring, and x is the displacement of the spring from its equilibrium position. In the scenario where a spring stretches 8.00 cm (or 0.080 meters) for a 10.0 kg load, the force exerted by the load (F) can be found using the force due to gravity, which is F = mg. The mass (m) is 10.0 kg, and the acceleration due to gravity (g) is approximately 9.80 m/s². Thus, F = (10.0 kg) × (9.80 m/s²) = 98.0 newtons (N).
Now that we know F and x, we can solve for the spring constant (k):
k = F/x
k = 98.0 N / 0.080 m
The spring constant k is 1225 N/m.
our boss asks you compare two sound waves and determine which has the higher frequency. Wave A has a period of 4⁄100 second and Wave B has a perio of 1⁄7 second.
Tim observes that a force pulls him down when he jumps up in the air. Based on his observation, which conclusion is correct?
Gravitational force is a contact force.
Gravitational force helps objects float.
Gravitational force pushes an object up.
Gravitational force is a non-contact force.
Answer:
Gravitational force is a non-contact force.
Explanation:
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The velocity of a wave is a function of its:
energy
form
medium
amplitude
Answer:
amplitude is the answer
What happens to the particles of the liquid inside a thermometer when the thermometer is heated?
They slow down and spread apart.
They speed up and spread apart.
They slow down and move closer together.
They speed up and move closer together.
Speed up and spread apart
A new statue of the town founder is erected in the park. At the unveiling, the statue is a orange-brown copper. After a year, the statue looks blue-green. Has a physical or chemical change taken place?
What is meant by saying that a wave has a low frequency?
A. The wave is very tall
B. The wave is very long
C. Few wave peaks pass a point in one second
D. A large number of wave peaks pass a point in one second.
Which winds are affected by specific landforms on earth's surface?
A) Westerlies
B) Polar Easterilies
C) Trade Winds
D) Local Winds
Which of the following make up the nucleus of an atom?
What does the force of gravity on an object depend on?
A. the object's mass
B. compounds
C. molecules
D. charged particles
why does glass expands before water?
This force on compass dials is an example of a force that _______.
A. needs electricity to act.
B. acts through particles in the air
C. acts only on contact.
D. acts at a distance.
acts at a distance
is the answer
Which procedure would best allow a scientist to observe a chemical property of hydrochloric acid (HCl) solution? cooling the HCl solution until it becomes solid, and measuring this temperature adding zinc to the HCl solution and observing whether or not bubbles are produced placing a conductivity probe into a beaker of HCl solution to determine if it conducts electricity measuring the mass of and volume of a sample of HCl solution to find its density
Answer: Adding zinc to the HCl solution and observing whether or not bubbles are produced.
A change in property that can be observed or can be measured without changing the substance's composition chemically is known as physical property. For example, change in temperature, change in state, change in mass, volume etc.
A change in property due to change in the chemical composition of the substance is known as chemical change. for example, when two substances react with each other and a chemically different product of formed.
→cooling the HCl solution until it becomes solid, and measuring this temperature- Physical change
→placing a conductivity probe into a beaker of HCl solution to determine if it conducts electricity-Physical change
→measuring the mass of and volume of a sample of HCl solution to find its density-Physical change
→adding zinc to the HCl solution and observing whether or not bubbles are produced-Chemical change:This would allow scientists to observe chemical property of HCl solution.
Answer:
The answer is B
Explanation:
I just took the test on edge
Dylan is the best athlete in our school. He plays football, basketball, and baseball and does the pole vault for the track team. He can vault up to five and seventy-three hundredths meters. If he would like to be able to pole vault up to six and twelve hundredths meters, how many more centimeters does he need to pole vault to reach his goal?
A graph that shows that the pressure of a gas varies inversely with its volume under constant temperature demonstrates
A. The pressure law
B. The density law
C. Charle’s law
D. Boyle’s law