Chalk is an ionic compound. Which is a property of all ionic compounds that makes chalk particularly useful for writing on a chalkboard? a high melting point hardness and brittleness inability to dissolve in water a multicolored appearance
The ionic compound property useful for writing on the chalkboard is hardness and brittleness
Information regarding the compound:Chalk should be an ionic compound. If there is hardness and brittleness so it is useful for writing on the chalkboard. But for other reasons like high melting point, dissolving in water does not impact it.
Therefore, the above option should be considered.
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Answer:hardness and brittleness
Explanation: im doing the same thing rn
While riding her bike, Maria averaged a velocity of 20 m/s. If she maintains that a velocity for a time of 20 seconds, how far does she ride?
Answer:
400m
Explanation:
distance = speed x time
20 x 20
=400m
how many significant figures are in the number 347,000
Answer:
there are 3 significant figures.
Explanation:
significant figures are 3,4,7.
PLEASE I NEED TO KNOW
A mountain climber encounters a gap in an ice field. The opposite side of the gap is 2.75m lower, and is separated horizontally by a distance of 4.1m. To cross the crevasse, the climber gets a running start and jumps in the horizontal direction. (A) What is the minimum speed needed by the climber to safely cross the gap? (B) What is the climber's velocity right before landing?
Answer:
A) 5.5 m/s
B) 9.2 m/s
Explanation:
A) Given in the y direction:
Δy = 2.75 m
v₀ = 0 m/s
a = 9.8 m/s²
Find: t
Δy = v₀ t + ½ at²
2.75 m = (0 m/s) t + ½ (9.8 m/s²) t²
t ≈ 0.75 s
Given in the x direction:
Δx = 4.1 m
a = 0 m/s²
t = 0.75 s
Find: v₀
Δx = v₀ t + ½ at²
4.1 m = v₀ (0.75 s) + ½ (0 m/s²) (.75 s)²
v₀ ≈ 5.5 m/s
B) Find vᵧ.
v² = v₀² + 2aΔy
vᵧ² = (0 m/s)² + 2 (9.8 m/s²) (2.75 m)
vᵧ ≈ 7.34 m/s
Find v.
v² = vₓ² + vᵧ²
v² = (5.5 m/s)² + (7.34 m/s)²
v ≈ 9.2 m/s
what property do all of the group 18 elements have that makes them stand out from other elements on the periodic table
Answer:
The noble gases are a group of chemical elements that make up Group 18 on the periodic table. These gases all have similar properties under standard conditions: they are all odorless, colorless, monatomic gases with very low chemical reactivity.
If a substance was described as smooth, square, and tan, what properties are
being referred to?
A. Mechanical properties
B. Chemical properties
0
C. Artificial properties
0
D. Physical properties
If a substance was described as smooth, square, and tan, what properties are being referred to its physical properties. Option D is correct.
What is physical properties ?Any measurable property whose value represents a condition of a physical system is referred to as a physical property.
A system's physical attributes can be utilized to characterize its transitions between brief states. Observable is a term used to describe physical qualities. These aren't modal attributes at all.
If a substance was described as smooth, square, and tan, what properties are being referred to its physical properties.
Hence, option D is correct.
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Refer to the position time graph provided to answer questions #1 thru 5.
1. What is the instantaneous velocity of the object at 5 s?
2. What is the distance the object moves from 0 to 9 seconds?
3. What displacement did the object have between 2 s and 9 s?
4. What was the object's average velocity over the first 5 seconds?
5. How many times does the object change direction of travel? (time zero
does not count and standing still does not count as a direction change)
Answer:
Explanation:
1). To calculate the instantaneous velocity of the object, we will calculate the slope of the line CD.
Since line CD is a straight line, therefore, slope = 0
Hence instantaneous velocity = 0
2). Distance of the object when it moves from 0 to 9 seconds
= Distance traveled from (A to B + B to C + C to D + D to E)
= 3 + (3 + 0.5) + 0 + 0.5
= 7 m
3). Displacement = Distance between initial and the final positions of the object
= 3 - 0
= 3 m
4). Average velocity = [tex]\frac{\text{Displacement}}{\text{Time}}[/tex]
= [tex]\frac{0.5}{5}[/tex]
= 0.1 m per sec
5). Direction changes have been seen at t = 2 sec and t = 4 sec.
Hence object changed its direction of travel 2 times.
A bus travels 210 km south along a straight
path with an average velocity of 85 km/h to
the south. The bus stops for 25 min, then it
travels 230 km south with an average velocity
of 73 km/h to the south.
How long does the total trip last?
Answer in units of h.
Answer:
6.04 hr
Explanation:
The bus first travels a distance of 210 km south at an average velocity of 85 km/h. The time, t it takes to cover this distance is gotten from d = vt and t = d/v where d = distance and v = velocity.
So, t = 210 km/85 km/h = 2.47 h
The bus then stops for 25 min. We convert 25 min to hours by dividing by 60.
So 25 min = 25/60 hr = 5/12 h = 0.42 h
The bus then travels 230 km south at an average velocity of 73 km/h.
The time it takes to cover this distance is t = 230 km/73 km/h = 3.15 h
So, the total time for the trip is the sum of each individual time, which is 2.47 h + 0.42 h + 3.15 h = 6.04 hr
So, it takes 6.04 hr for the total trip
Which changes would result in a decrease in the gravitational force between two objects? Check all that apply.
increasing the distance between the objects
decreasing the distance between the objects
increasing the mass of one of the objects
increasing the mass of both objects
decreasing the mass of one of the objects
decreasing the mass of both objects
Answer:
- increasing the distance between the objects
- decreasing the mass of one of the objects
- decreasing the mass of both objects
Explanation:
Got it right on Edge 2020.
The gravitational force is decreased by increasing the distance between the objects or decreasing mass of one or both of the objects
According to Newton's law of Universal Gravitation; The force of gravity is directly proportional to the product of the masses between two bodies and inversely proportional to the square of the distance between them.
F = Gm1m2/r^2
Where;
G = gravitational constantm1 and m2 are the masses of the objects r = distance separating the objects.F = gravitational forceWe can see from the formula above, that the following will result in the decrease of the force between two objects;
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Explain any two areas affected by migration
Answer:
Migration is affected by various factors like age, sex, marital status, education, occupation, employment etc. Age and sex are main demographic factors that affect the migration. Men, generally, migrate to other places quite often though there are more women who migrate to husbands' places after marriage.Answer:
Social aspect:
In the place of origin migration can create a lack of food, accomodation and other basic services and facilities. Because of influence of lanuage, tradition , culture etc carried by immigrants the native language culture and tradition of the target place may get endangered. This may create diverseness of culture language so there can be disunity and factionalism in society. Target place may have to experience unemployment and criminal activities may take a lead.The place of origin may have to suffer from depopulation and slow development as well..
Economic aspect:
Target place may get some more manpower which results in fast development. But if the manpower is enough or more then unemployment can be resulted. This may cause brain drain. Poverty may take a lead. Landlords may exploit labourers ....
Which of these physical properties is not.similar in all four of these objects
A. Mass
B magnetism
C density
D electrical conductivity
what are examples of velocity and speed
Explanation:
A train moves at a high velocity. Velocity is the rate of motion, speed or action. An example of velocity is a car driving at 75 miles per hour.
Select the positive statement that would BEST counteract this negative statement: "I do not have the time to exercise." A. I can exercise anywhere. B. I have to start somewhere. C. I will make it a priority. D. I will increase my energy. Please select the best answer from the choices provided. A B C D
Answer:The awnser would be C!
Explanation:
Hope this helped!
Answer:
C. I will make it a priority.
Explanation:
To float in air, a blimp would be filled with helium (true or false)
Two point charges +3 micro coulomb and +8 micro coulomb repel each other with a force of 40N . If a charge of -5 micro coulomb is added to each of them, then the force between them will become?
Answer:
1 N
Explanation:
Given that two point charges +3 micro coulomb and +8 micro coulomb repel each other with a force of 40N.
Let us first calculate the distance between the two point charges
F = (KQq)/r^2
Where K = 9.0 × 10^9Nm^2C^-2
40 = (9×10^9 × 3×10^-6 × 8×10^-6)/r^2
Make r^2 the subject of formula
r^2 = 0.216/40
r = sqrt (5.4^-3)
r = 0.0735 metres
If a charge of -5 micro coulomb is added to each of them, then the force between them will become?
Using the same formula again
F = ( KQq)/r^2
Where Q = 8 - 5 = +3 × 10^-6 C
q = 3 - 5 = - 2 × 10^-6 C
F = ( 9×10^9 × 3×10^-6 × 2×10^-6 )/5.4×10^-2
F = 0.054/0.054
F = 1 N
The force of attraction between the two point charges will be 1 N
If a leftward force on a box is 5N and the rightward force on a box is 3 N, the net force on the box is____________ and it is moving to the_______________
Answer:
The net force on the box is 2N and it will make the box to move in a leftward direction
Explanation:
We should understand first of all that forces are vectors. This means that they have both magnitude and direction.
The next thing we will need to do is to set a coordinate system. Let the leftward forces be negative while the rightward forces are positive.
That means that the equivalent forces on the box will be -5N + 3N = - 2N
Hence, the net force on the box is 2N and it will make the box to move in a leftward direction
Si la aceleración de gravedad en la superficie del planeta Mercurio es de 3,7 m/s2, entonces ¿cuál sería el peso de una persona de 60 kg de masa que se encuentre sobre su superficie?
Answer:
W = 222 N.
Explanation:
The qiestion says" If the acceleration of gravity on the surface of the planet Mercury is 3.7 m / s2, then what would be the weight of a person with mass 60 kg on its surface? "
Mass of the person, m = 60 kg
The acceleration due to gravity on the surface of gravity is 3.7 m/s²
We need to find the weight of a person on the surface of Mercury.
Weight of an object is given by :
W = mg
So,
W = 60 kg × 3.7 m/s²
W = 222 N
Hence, the person will weigh 2222 N on the surface of Moon.
Why does stone take so long to cool?
Answer:
Stone has what's called a high thermal conductivity, which is simply a fancypants way of saying that it allows heat to flow through it quickly. For example, suppose the piece of stone in question is at room temperature, or 70 degrees. Your body likes to keep an average toasty temperature of 98.6F.
Give two examples of pure substances and two examples of mixtures
Answer:
1 kerosene is the pure substance, salt and water is the mixture substance
Answer:
pure substansubdiamond nd sulphur. mixture:salt nd oil ,oil nd water
What is radiation? Transfer of heat through objects touching the source. Transfer of heat through direct physical contact. Transfer of heat through electromagnetic waves. Transfer of heat through the movement of particles.
Answer:
Transfer of heat through electromagnetic waves
Answer:
Transfer of heat through electromagnetic waves.
I got it right in a test
Plug variables expressed in SI units in the kinematic equation given in article: a = -v0^2/(2sg). What value of g you get as expressed in g's where g = 9.8 m/s^2 1 point the same as in English units smaller larger this calculation cannot be performed in SI units If the initial velocity of player is doubled then the absolute acceleration would * 1 point decrease 2x stays the same increase 2x increase 4x If stopping distance is decreased 2x then the acceleration would * 1 point decrease 2x stay the same increase 2x increase 4x Other: Hockey player having initial velocity 20 m/s and helmet having padding 5 cm hits head on his twin brother. The acceleration of his brain is most closely equal to * 1 point 0.4g 4g 40g 400g
Answer:
1) acceleration is increased by a factor of four 4X
2) the acceleration increases a factor of 2X
3) the correct answer of 400g
Explanation:
This is a kinematics exercise, where you use the velocity equation to obtain the acceleration, with the final velocity equal to zero.
v² = v₀² + 2 a x
0 = v₀² + 2 a x
a = - v₀² / 2 x
In the case of wanting to give the acceleration as a function of g, we can find the relationship between the two quantities
a / g = - v₀² / (2 x g)
Let's answer the different questions about this equation
1. The initial velocity is doubled, how much the acceleration is worth
a/g = - (2v₀) 2 / 2xg
a = 4 (-v₀² / 2xg) g
acceleration is increased by a factor of four 4X
2. if the stopping distance is reduced by 2, that is, x = x₀ / 2
we substitute
a/g = (- v₀² / 2g) 2/x
a =2 (-v₀² / 2x₀g) g
therefore the acceleration increases a factor of 2X
3. the initial velocity of the hockey player is v₀ = 20 m / s and the stopping distance is
x = 5cm = 0.05m
we calculate the acceleration
a / g = - 20² / (2 0.05)
a / g = - 4000 / g
a / g = - 4000 / 9.8 = 408
a = 408 g
the correct answer of 400g, the value matches exactly if g = 10 m / s2 is taken
name the three States of matter
Answer:
[tex] \fbox{ \sf { \: Solid \: , \: Liquid \: and \:Gas}}[/tex]
Explanation:
[tex] \star[/tex] Let's learn about matter.
We see different kinds of things around us. Some of these are wood , book , salt , beaker , sugar , water , milk , oil, rubber and water vapour. All these things occupy space and have mass as they are matter. Anything that occupies space and has weight is called matter.
[tex] \star[/tex] States of Matter
Solid , liquid and gas are the three states of matter.
[tex] \hookrightarrow{ \text{ \underline{ Solid}}}[/tex]
Different things have different sizes and shapes but a particular thing has a fixed shape and size. The things which have definite size and definite shape are solids. Stone , word , ice , glass etc are some examples of solid.
[tex] \hookrightarrow{ \text{ \underline{ Liquid}}}[/tex]
The things having a definite volume but no definite shape of their own are called liquids. Water ,milk , petroleum , oil etc are as common examples of liquid.
[tex] \hookrightarrow{ \underline{ \text{Gas}}}[/tex]
The things which have neither a definite volume not a definite shape of their own are called gases. The bases take the shape and the size of the vessels in which they are enclosed. Air , smoke , water vapours , hydrogen gas are some examples of gases.
[tex] \sf{Hope \: I \: helped !}[/tex]
[tex] \sf{Best \: regards !!}[/tex]
~[tex] \text{TheAnimeGirl}[/tex]
If R1 is 2 ohms and R2 is 3 ohms and R3 is 5 ohms...what is total resistance?
R1
R2
R3
W
M
I
I
o a
1 ohms
Ob
10 ohms
Ос
8 ohms
HEEELLLLLPPPPPPPP
Answer:
10 ohm
Explanation:
Since the resistors are arranged in series, their total resistance is their sum.
Hence, Total R = 2+3+5 = 10 ohm
Which of the following is an example of mechanical energy?
The light from the sun.
The energy in a ball as it is falling.
The heat from a fire.
The light from a light bulb.
Answer:
The light from a light bulb
Explanation:
The energy in a ball as it is falling is the right example of mechanical energy. Mechanical energy is the sum of kinetic and potential energy.
What is mechanical energy?Mechanical energy is the energy obtained by the things in which work is performed. Mechanical energy is the energy that an item possesses as a result of its motion or location.
The light from a light bulb. and the light from the sun is a form of light energy, the heat from a fire is an example of the thermal energy,
The energy in a ball as it is falling is the right example of mechanical energy. Because it includes the potential energy which is the virtue of the position and the kinetic energy due to the motion.
Hence option A is correct
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Robin jogs with an average speed of 5.5 m/s for 3.3s.
What was her distance travelled in meters?
Answer:
18.15m
Explanation:
Speed * Time = Distance
5.5 * 3.3 = 18.15m
The distance traveled by Robin is equal to 18.15 m with an average speed of 5.5 m/s for 3.3s.
What is the average speed?The average speed can be explained as the total distance covered by the object in a definite time. The average speed can be considered a scalar quantity as it exhibits magnitude and no direction.
The average speed of a physical system can be determined from the ratio of the total distance traveled by the system to the time taken to cover that distance.
The average speed equation of a physical system can be written as follows:
Average speed = Total distance/total time taken
Given, the average speed of the Roin, = 5.5 m/s
The time is taken by Robin for jogging = 3.3 s
The average speed of the Robin can be determined as:
Average spped = Distance/ time
5.5 = Distance/3.3
Distance traveled by Robin = 5.5 × 3.3 = 18.15 m
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What force is required to accelerate a 6 kg bowling ball at 2 m/s/s forward?
Answer:
12N
Explanation:
Force = mass * acceleration.
6 * 2 = 12
Taking into account the Newton's second law, the force required to accelerate a 6 kg bowling ball at 2 m/s² forward is 12 N.
In first place, acceleration in a body occurs when a force acts on a body. There are two factors that influence the acceleration of an object: the net force acting on it and the mass of the body.
Newton's second law states that this force will change the speed of an object because the speed and / or direction will change. These changes in velocity are called acceleration.
So, Newton's second law defines the relationship between force and acceleration mathematically. This law says that the acceleration of an object is directly proportional to the sum of all the forces acting on it and inversely proportional to the mass of the object.
Mathematically, Newton's second law is expressed as:
F= m×a
where:
F = Force [N] m = Mass [kg] a = Acceleration [m/s²]In this case, you know:
F= ? m= 6 kg a= 2 m/s²Replacing:
F= 6 kg× 2 m/s²
Solving:
F= 12 N
Finally, the force required to accelerate a 6 kg bowling ball at 2 m/s² forward is 12 N.
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Helpppppp!!!
function of osteoblasts in the body
Answer:
They provide structure and support.
Explanation:
Question number 2 ppllzzzzzzz
28.2 km equal how many meters
Answer:exactly 28200 meters
Explanation: