Answer:
68.6N
Explanation:
Given parameters:
Mass of object = 7kg
Unknown:
Weight = ?
Solution:
The weight is the downward force of gravity on a body;
Weight = mass x acceleration due to gravity
Weight = 7 x 9.8 = 68.6N
Why do farmers need to use strategies like crop rotation?
Answer:
Crops drain the soil of nutrients
Explanation:
i took the test:) yw
Making a forecast of what will happen in the future based on past experience or evidence is called
a.
observing.
c.
predicting.
b.
inferring.
d.
classifying.
Answer: c
Explanation:
A spring has a force constant of 40000 N/m.
How far must it be stretched for its potential energy to be 42 J?
Answer in units of m
Answer:
0.05m
Explanation:
Given parameters:
Force constant of the spring = 40000N/m
Potential energy = 42J
Unknown:
Extension = ?
Solution:
To solve this problem, use the expression below:
E.PE = [tex]\frac{1}{2}[/tex] k e²
k is spring constant
e is the extension
42 = [tex]\frac{1}{2}[/tex] x 40000 x e²
e = 0.05m
When two forces exerted on an object are balanced, the object
Answer: Will not accelerate.
Explanation: When all the forces acting upon an object balance each other, the object will be at equilibrium; it will not accelerate.
An object has a 50N force applied to it and it accelerates at 3 meter per second squared. What is its mass?
Answer:
16.67 kg
Explanation:
Acceleration = 3 m/s^2
Force = 50 N
Force = mass * acceleration
mass = force / acceleration
mass = 50 / 3
mass = 16.67 kg
Whoever could answer this I would make Brainliest
Answer:
1. the rocks at the bottom of the aquarium
2.the fish and maybe the plants (if you use live plants)
3. fish interact with there no living things like how one would hide in the grass or something like that.
4. decorations (like a cave or fake house, tho the aquarium its self is a home)
5.they would die, and rot.
Explanation:
rocks are nonliving
fish are living things and so are plants
fish can hide in the plants
the fish can "live" in the decorations, but the aquarium itself is its home.
if something reaches the end of its life span it dies.
how do we change km/h to m/s
Answer:
36km/h = 10m/s
Explanation:
That's the formula to convert
I will give brainlest to whoever answers plz help me plz
Which law of motion is in effect for each of the following?
A-A wrecking ball hitting a building.
B-A person pulling on a boat oar.
C-A car going around a banked curve.
Plz answer A, B, and C with the law of motion it is.
Answer:
A-first law
B-third law
C-second law
Explanation:
HOW MANY SIGNIFICANT FIGURES ARE THERE IN THE NUMBER 405,000?
Answer:
Three, but see below.
Explanation:
You can be certain of three, but that may not be true at all. The only way to know for certain is to put it into scientific notation.
4.05 * 10^5 would be three, but other answers are possible. For example
4.050 * 10^5 would have 4.
what is the average acceleration of a car if a car rest from 0m/s and reaches a final velocity is 50m/s in 10m/s
Answer:
Assuming that you meant the final velocity of 50 m/s was reached in 10 s, the answer would be 5 m/s^2.
Explanation:
[tex]V_{f} = V_{i} + at[/tex]
So we update that with the values that we have.
[tex]50 = 0 +a(10)[/tex]
then simplify that using algebra to solve for a and we get 5 m/s^2
1. Suppose that a log is burning in a fireplace. The log contains chemical energy. Light,
heat, and some sound are given off as the log burns. How does this demonstrate the
law of conservation of energy?
A.
B.
The total amount of energy in the universe changes.
Energy is destroyed.
Energy is created.
Energy is converted from one form to another.
C.
D.
Answer:
energy is converted in one form to another
Explanation:
please give brainlest need 3 more
Describe a way that gravity influenced the formation of the solar system, with the planets orbiting the sun.
Gravity influenced the formation of the solar system, with the planets orbiting the sun.
What is Gravitational Force ?Gravitational force is force of attraction between two masses. Gravitational force(F) between two bodies is directly proportion to the product of masses(m₁,m₂) of two bodies and inversely proportional to square of distance(r) between them. mathematically it is written as,
F [tex]\alpha[/tex] m₁.m₂
F [tex]\alpha[/tex] 1/r²
F = G m₁,m₂÷r²
where G is gravitational constant, whose value is 6.6743 × 10⁻¹¹ m³ kg-1s⁻².
Force is expressed in Newton N in SI unit. its dimensions are [M¹L¹T⁻²].
According to Kepler's first law of motion, every planet is moving in an elliptical orbit with sun has situated at one of the foci of the orbit.
when a planet moves in the orbit around the sun, it moves in a stable orbit. in this orbit , centripetal force is equal to centrifugal force, in this case centripetal force appears as gravitational force. Means Gravitational force between sun and planet balances the centrifugal force which is outwards. In such a way gravity influenced the formation of the solar system.
Hence gravity plays crucial role in the formation of solar system.
To know more about Gravity :
https://brainly.com/question/14874038
#SPJ3.
an apple falls from the top of the tree and takes 2 secs to hit the ground.
how far did the apple fall?
calculate the velocity of the apple just before it hits the ground.
A student mixes two substances in a large beaker. After two hours, the student sees that the substances have separated again.
The full question is found in the image attached
Answer:
Densities
Explanation:
When we talk about density, one of the things that come to our mind is actually how heavy something is.
If i have substances that possess different densities, i will notice that i can not really mix them because they will separate and the heavier substance will be at the bottom while the lighter substance will be at the top.
Hence the two substances separated due to difference in density.
DUE TONIGHT 50 POINTS
An applied force of 13 N east acts on a 6.5-kg block that is moving east at 2.5 m/s on a level, frictionless surface. What is the final speed
of the block if the force is applied for 2.1 s?
A. 1.7 m/s
B. 4.2 m/s
C. 6.7 m/s
D. 7.2 m/s
HELP NEEDED ASAP GIVING BRAINLIEST!!
View the video clip below and answer the question.
The video clip above illustrates the process of __________
Exploding planet or astroifd
Why does a ball not bounce back up to its original height?
Answer:
Gravity
Explanation:
amanda placed a small television on a metal rolling cart. on her way to the library, her friend carlos stepped in front of the cart. although amanda stopped suddenly, the television stayed in place on the cart. what kept the television on the cart when she stopped suddenly?
Answer:
Friction. Have a great day! Think positive <3
Answer: Friction
Explanation: It makes sense
4. A force of 6.0 Newtons is applied to a block at rest on a horizontal frictionless surface over a 7.0 meter span. How much energy is gained by the block?
Answer:
42 Joules
Explanation:
Given that a force of 6.0 Newtons is applied to a block at rest on a horizontal frictionless surface over a 7.0 meter span. How much energy is gained by the block?
The parameters given are:
Distance covered = 7.0 m
The force = 6.0 m
The formula for work done is the product of force and distance. That is,
Work done = force × distance
Where work done is the same as energy.
Energy = force × distance
Energy = 6 × 7
Energy = 42 Joules.
Therefore, the energy gained by the block is 42 Joules.
Which of the following is an English system unit of measure?
O A. meter
B. mile
O C. gram
OD. liter
Gravitational potential energy is due to....
a. mass and height above the ground
b. the amount of power an object has
c. the speed of an object
d. how far an object is stretched
Answer:
A
Explanation:
I only think its A because of the gravity part...sorry im not good at explaining
A laser with wavelength of 0.00005 m is aimed at a mirror with
an angle of incidence of 30°. What is the angle of reflection of
the laser?
Answer:
this is question is trying to trick you
Explanation:
it gives long words but all you need to know is just a few
the second law of reflection states that the angle of incidence equals to the angle of reflection
so if the angle of incidence = 30
then
the angle of reflection = 30
hope this helps,
please mark it brainliest
Which method of popcorn popping transfers heat into the kernels without any direct
contact (nothing hot touched the kernels)? Explain.
Answer:
It is cause by radiation that's the answer
Explanation: the heat project sun rays towards the popcorn which causes it to pop
................ help me pls
Answer:
Explanation:
b
Ee = %2 xkx e?. Re-arrange to give an equation for:
a) The spring constant k.
b) The extension squared e2.
c) The extension e.
Answer:
a) Equation for spring constant k is [tex]k = \frac{2E}{e^2}[/tex]
b)Equation for the extension squared is [tex]e^2 = \frac{2E}{k}[/tex]
(c) Equation for the extension e is [tex]e = \sqrt{\frac{2E}{k} }[/tex]
Explanation:
Given;
[tex]E = \frac{1}{2} ke^2[/tex]
where;
E is the elastic potential energy
k is the spring constant
e is the extension of the spring
a) Equation for spring constant k is given as.
[tex]E = \frac{1}{2} ke^2\\\\ke^2 = 2E\\\\k = \frac{2E}{e^2}[/tex]
(b) Equation for the extension squared e2;
[tex]E = \frac{1}{2} ke^2\\\\ke^2 = 2E\\\\e^2 = \frac{2E}{k}[/tex]
(c) Equation for the extension e;
[tex]e^2 = \frac{2E}{k} \\\\e = \sqrt{\frac{2E}{k}}[/tex]
Help with either I don’t understand this I know W=f*d but don’t get how it applies here
Answer:
5) Displacement = +3.125 m
Displacement is in the same direction as the force vector.
6) Force = -53.89 N
Force is in an opposite direction relative to the displacement.
Explanation:
5) We are given;
Force; F = 160 N.
Workdone; W = +500 J
Now, formula for workdone is;
W = Force × displacement
Thus, displacement = Work/force
Displacement = 500/160
Displacement = +3.125 m
Thus, displacement is in the same direction as the force vector.
6) We are given;
Displacement; d = 18 m.
Workdone; W = -970 J
Like in the first answer above,
Workdone = Force × Displacement
Thus;
Force = Workdone/Displacement
Force = -970/18
Force = -53.89 N
Since force is negative and displacement is positive, it means force is in an opposite direction relative to the displacement.
A(n) _____ represents the U.S. in a foreign country.
A. attorney general
B. ambassador
C. secretary
D. embassy
Answer:
B(Ambassador)
Explanation:
The president appoints ambassadors to foreign countries to represent the United States.
Which of the following is the best thermal conductor?
A. Gasoline
B. Silver
C. Plastic
D. Helium
Answer:
The answer is B. Silver
Explanation:
I took AP3X quiz.
Define potential energy (PE)
Answer:
Potential energy is the energy that exists by virtue of the relative positions (configurations) of the objects within a physical system.
This form of energy has the potential to change the state of other objects around it, for example, the configuration or motion.
Various forms of energy can be grouped as potential energy.
Each of these forms is associated with a particular kind of force acting in conjunction with some physical property of matter (such as mass, charge, elasticity, temperature etc).
For example, gravitational potential energy is associated with the gravitational force acting on object's mass; elastic potential energy with the elastic force (ultimately electromagnetic force) acting on the elasticity of a deformed object; electrical potential energy with the coulombic force; strong nuclear force or weak nuclear force acting on the electric charge on the object; chemical potential energy, with the chemical potential of a particular atomic or molecular configuration acting on the atomic/molecular structure of the chemical substance that constitutes the object; thermal potential energy with the electromagnetic force in conjunction with the temperature of the object.
For an example of gravitational potential energy, consider a book placed on top of a table.
To raise the book from the floor to the table, work must be done, and energy supplied. (If the book is lifted by a person then this is provided by the chemical energy obtained from that person's food and then stored in the chemicals of the body.) Assuming perfect efficiency (no energy losses), the energy supplied to lift the book is exactly the same as the increase in the book's gravitational potential energy.
The book's potential energy can be released by knocking it off the table.
As the book falls, its potential energy is converted to kinetic energy.
When the book hits the floor this kinetic energy is converted into heat and sound by the impact.
Explanation:
Answer:
potential energy is basically stored energy
Explanation:
On a visit to a science lab, Madison observes a blob of shiny material that is floating in the air.
The blob is not moving.
What can she conclude about the force(s) acting on the blob?
Answer:
Each force acting on the blob has another one to cancel it out
Explanation:
Answer:
well we know for sure that gravity is not affecting it because it is floating in the air.
Explanation: