Which of the following combinations makes up an ionic compound?
A. A positive anion and a positive anion
B. A positive anion and a negative cation
O C. A positive cation and a negative cation
D. A positive cation and a negative anion
Answer:
D. A positive cation and a negative anion
Explanation:
An ionic compound is defined as the chemical compound formed by the combination of two charged particles or ions held together by electrostatic forces.
An ionic compound is made up of ions, a cation which is a positively charged ion and an anion which is a negatively charged ion. Example of ionic compounds are Lithium Fluoride, Lithium Iodide, and Sodium Bromide.
Hence, the correct answer is "D. A positive cation and a negative anion".
What is the velocity of an object that has been in free fall for 2.5 s?
A. -3.9 m/s downward
B. 3.9 m/s downward
C. 250 m/s downward
O
D. 25 m/s downward
Answer: D. 25 m/s Downward
Explanation:
V = (g)(t)
V = (9.8 m/s²)(2.5)
V = 24.5 m/s
how does density affect the pressure of a liquid?
Anyone plz answer
Answer:
As the density of the liquid increases, so does the pressure. If the liquid is open to the air, there will also be atmospheric pressure on its surface.
Explanation:
GRAVITY IS DEPENDENT UPON *
A. Mass and Newton’s
B. Newton’s and Pounds
C. Distance and Mass
D. Distance and Liters
Answer:
C......................
.
What is one common cause of farsightedness?
a cornea that is not curved enough
an iris that cannot contract
a cornea that is too curved
an eyeball that is too long
Answer:
a cornea that is not curved enough
Answer:
a cornea that is not curved enough
Explanation:
Or in other terms a cornea that is too flat.
Jimothy is riding his bike to his friend's house. He decides to see how fast he can go, and starts pedaling as hard as he can. He began with an initial velocity of 2.5 m/s. He pedals with an acceleration of 1.5 m/s^2 for a time of 6 seconds. Calculate his final velocity.
Answer:
Final velocity, V = 11.5m/s
Explanation:
Given the following data;
Initial velocity, U = 2.5m/s
Acceleration, a = 1.5m/s²
Time, t = 6secs
To find the final velocity, we would use the first equation of motion
V = U + at
Substituting into the equation, we have
V = 2.5 + 1.5*6
V = 2.5 + 9
Final velocity, V = 11.5m/s
What is the normal force exerted by the ground on a 65-kg metal bar?
-640 N
640 N
-65 N
Answer:
640N
Explanation:
Mass of a metal bar, m = 65 kg
We need to find the normal force exerted by the ground on the bar.
The normal force on an object acts in upward direction. The magnitude of normal force is equal to its weight.
N= mg
Put m = 65 kg and g = 9.8 m/s²
N = 65 × 9.8
= 637 N
or
N = 640 N
Hence, the normal force is 640 N.
what’s the answer here? is it d or c i’m confused
What is the constant for universal gravitation
Answer:
G is called the constant of gravitation and is equal to 6.67 × 10−11 newton-metre2-kilogram−2.
Explanation: I hope this helps* pls mark me brainliest*
4Osteoporosis is a disorder that can be caused by not consuming enough calcium. What can you infer about osteoporosis
Answer:
It affects the bones
Explanation:
Many inorganic elements are very useful in the body. Many of them carry out diverse important functions and play key roles in parts of the body.
Calcium is essential for strong bones. Hence, any disorder that results from not consuming enough calcium must be connected to the bone.
Therefore, osteoporosis affects the bone.
Match the term to its description.
Elliptical galaxy
Galaxy
Lens galaxy
Spiral galaxy
Answer choices:
Forms a perfect sphere or an ellipse and is flattened to some degree.
Is a collection of several billion stars and interstellar matter isolated in space.
Has a large flattened core.
Has a central core from which curved arms spiral outward.
Answer with Explanation:
Elliptical galaxy = Forms a perfect sphere or an ellipse and is flattened to some degree.
The context clue here is the word "ellipse." The elliptical galaxy follows the elliptical shape. It is considered as the most abundant type of galaxy.Galaxy = Is a collection of several billion stars and interstellar matter isolated in space.
A galaxy is made up of billions of stars, and these stars are drawn together by gravitational force.Lens galaxy = Has a large flattened core.
A lens galaxy has a large flattened core, similar to the shape of a lens.Spiral galaxy = Has a central core from which curved arms spiral outward.
The context clue here is the word "spiral outward." The swirling arms is a common characteristic of spiral galaxies.
Answer:
Elliptical galaxy – Forms a perfect sphere or an ellipse and is flattened to some degree.
Galaxy – Is a collection of several billion stars and interstellar matter isolated in space.
Lens galaxy – Has a large flattened core.
Spiral galaxy – Has a central core from which curved arms spiral outward.
which soap sample most likely took the longest time to dissolve
What is the mechanical advantage of the screw shown below? O A. 14.1 O B. 2 O C. 12.6 O D. 8.2.
Answer: C. 12.6
Explanation: 2*pi*1.8= 11.304
11.304/0.9= 12.56
Calculate the speed for a car that went a distance of 125 miles in
2 hours time? Provide the speed in kilometer per hour
Why does a magnet get demagnetized when hammered?
Answer:
Answer is on the pic
Explanation:
I hope it's helpful!
How much work do you do, when you lift a 155 n child .8 m?
Answer:
1240j I think this is the answer
Please I badly need help!!
Answer:
i can not see the picture
Explanation:
The neighborhood joker comes up to you and is really on a roll this morning. After several “good ones” they then say “OK so you’re taking physics, right? Here’s one – if the acceleration of gravity is 9.8 m/s2 then why isn’t everything accelerating? HAHAHA”. Being a dedicated student you give this question some real thought and come up with a reasonable response. You might say:
The coefficient of kinetic friction between an object and the surface upon which it is sliding is 0.28. The weight of the object is 30N. What is the force of friction?
Answer:
30 x 0.28 = 3.78 is your answer
Explanation:
the question is asking for the weight of the object so you multiply and get 3.79
What is the answer of this crossword. Non-renewable resources found deep in the ground. 1 ____ 2____ 3____ 4 E 5____ 6____ 7____ 8 S
Answer:
Crude oils
Explanation:
The correct word should be crude oils.
Crude oil is a non-renewable resource that is geologically formed and found deep in the ground. It is a naturally occurring mixture of hydrocarbons and usually fractionated to serve different purposes for the use of man. Crude oils are non-renewable because the rate at which humans exploit them is quite faster than the rate at which they are being naturally replenished deep in the ground.
8th grade science /collisions
Answer:
C
Explanation:
differentiate can you help me plzzzzzzz
Explanation:
Acceleration and the other term are the same physical phenomenon - just with opposite affects. Acceleration increases velocity, while the other term that begins with the letter "R" reduces.
***(Brainly's language filter is blocking the use of the second term in my answer.)***
Acceleration is defined as the rate of change of the velocity of an object per unit of time...
[tex]a = \frac{dv}{dt}[/tex]
Acceleration would be a POSITIVE (+) quantity, while the r-word would be negative (-).
How long does it take for the moon to orbit around the Earth?(no copied answer)
Answer:
27 days it take for the moon to orbit around the EarthHELP ASAP THIS ASSIGNMENT LOCKS TODAY PLEASEEEE
Answer:
I'm going with a and y I dont want it to be wrong tho
A storm cloud has a charge of 0.055 C. Due to polarization, the top of a tree gains a charge of -0.006 C. The cloud moves to 98 meters above the tree. Find the amount of force between the cloud and the tree rounded to two decimal places.
Answer:
F = 309.24 N
Explanation:
Given that,
Charge on a strom cloud, q₁ = 0.055 C
The charge gained by the top of a tree, q₂ = -0.006 C
The cloud moves to 98 meters above the tree.
We need to find the amount of force between the cloud and the tree. The electrical force between two charges is given by :
[tex]F=\dfrac{kq_1q_2}{r^2}\\\\F=\dfrac{9\times 10^9\times 0.055\times 0.006 }{(98)^2}\\\\F=309.24\ N[/tex]
So, the force between the cloud and the tree is equal to 309.24 N.
explain how we connect a bulb in a circuit
pls give me a answer
Answer:
Connect one end of each wire to the screws on the base of the light bulb holder. ...
Connect the free end of one wire to the negative (“-“) end of one battery. ...
Attach the free end of the other wire to the positive (“+”) end of the battery.
Explanation:
Please answer the question for gravitational field attached in the image.
We are given:
Radius of Venus= 6 * 10⁶ m
Height above the planet's ground = 9.4 * 10⁶ m
Mass of Venus = 4.867 * 10²⁴ kg
Finding the Gravitational Field:
We first need to calculate the distance between the center of masses
Distance between center of masses:
Since the point is above the surface of Venus, the radius of Venus and the height will add
Distance between the center of masses = 9.4*10⁶ + 6 * 10⁶
Distance (r) = 15.4 * 10⁶ m
Now back to Gravitational field!
We know the formula for Gravitational Field:
g = GM / r² [where g is the gravitational field, M is the mass of the planet, r is the distance between the center of masses and G is the gravitational constant]
plugging the known values in the formula:
g = (6.67 * 10⁻¹¹ * 4.867 * 10²⁴) / (15.4*10⁶)² [G = 6.67*10⁻¹¹ Nm²/kg²]
g = (32.46 * 10¹³) / (237 * 10¹²)
g = (32.46 * 10¹³) / (23.7 * 10¹³)
g = 32.46/23.7 [the 10¹³ got cancelled out]
g = 1.367 N/kg² (or m/s²)
Two carts with masses of 14.7 kg and 3.2 kg
move in opposite directions on a frictionless
horizontal track with speeds of 6.7 m/s and
3.1 m/s, respectively. The carts stick together
after colliding head-on.
Find their final speed.
Answer:
Speed, V = 4.95m/s
Explanation:
Given the following data;
Mass, M1 = 14.7kg
Mass, M2 = 3.2kg
Velocity, V1 = 6.7m/s
Velocity, V2 = 3.1m/s
To find the final speed;
Mathematically, inelastic collision is given by the formula;
[tex] V = \frac{(M_{1}V_{1}+M_{2}V_{2})}{(M_{1}+M_{2})}[/tex]
Where;
V is the final velocity in m/s.
M1 is the mass of the first object in kgs.
M2 is the mass of the second object in kgs.
V1 is the initial velocity of the first object in m/s.
V2 is the initial velocity of the second object in m/s.
Substituting into the equation, we have;
[tex] V = \frac{(14.7*6.7) - (3.2*3.1)}{14.7 + 3.2}[/tex]
[tex] V = \frac{98.49 - 9.92}{17.9}[/tex]
[tex] V = \frac{88.57}{17.9}[/tex]
Speed, V = 4.95m/s
Q3. A large block of stone is held at a height of 15m having gained 4500J
of GPE. How much does it weigh (you are calculating mass!) ? Answer to
one decimal
place.
Answer:
[tex]gpe = mgh \\ = (mg)h[/tex]
(mg)= weight
[tex]pe = (mg)h \\ 4500 = 15(mg) \\ mg = 300n[/tex]
mg = 300N
If a large block of stone is held at a height of 15m having gained 4500J
of gravitational potential energy, then the weight of this large block of stone would be 300 Newtons.
What is mechanical energy?As total mechanical energy is the sum of all the kinetic as well as potential energy stored in the system.
ME = KE + PE
As given in the problem if a large block of stone is held at a height of 15m having gained 4500J of gravitational potential energy,
height = 15 meter
The gravitational potential energy of the block of stone is 4500J.
the total gravitational potential energy is given by the expression,
PE = mgh
4500 = mg×15
mg = 4500/15
= 300 Newtons
Thus, the weight of the large block of stone would be 300 Newtons
To learn more about mechanical energy from here, refer to the link;
brainly.com/question/12319302
#SPJ2
If the man has initial velocity of 0.4 m/s, acceleration is 0.343 m/s^2, a time of 5.8 seconds, and experimental final velocity of 2.4 m/s? What is the calculated final velocity?
Group of answer choices
2.15 m/s
2.39 m/s
3.25 m/s
3.49 m/s
Answer:
The answer is going to be C.
Explanation:
Trust me. Im an expert in physics
