Answer:
The kinetic coefficient of friction of the sled on the snow is 0.05
Explanation:
The given parameters are;
The weight of the sled Jill is pulling, W = 200 N
The force with which Jill is pulling the the sled = 10 Newtons
The nature of the speed with which the sled is pulled = Constant speed
Therefore, given that the only opposing force to the pulling of the sled = The force of kinetic friction, we have;
The force with which Jill is pulling the the sled = 10 Newtons = The force of kinetic friction, [tex]F_k[/tex]
The force of kinetic friction = The weight of the sled, W × The kinetic coefficient of friction of the sled on the snow, [tex]\mu _k[/tex]
[tex]F_k[/tex] = W × [tex]\mu _k[/tex]
[tex]\mu _k[/tex] = [tex]F_k[/tex]/W = 10 N/(200 N) = 0.05
The kinetic coefficient of friction of the sled on the snow = [tex]\mu _k[/tex] = 0.05.
Write some harms of friction.
Answer:
Friction produces unnecessary heat leading to the wastage of energy. The force of friction acts in the opposite direction of motion, so friction slows down the motion of moving objects. Forest fires are caused due to the friction between tree branches. However, friction can also cause problems in a car. Friction between moving engine parts increases their temperature and causes the parts to wear down. Friction can be both harmful and helpful, so it may be necessary to decrease or increase friction.
Answer:
Friction had many disadvantages and these are the har,s of friction too.
Explanation:
Disadvantages of friction are mainly forest fires, decreasing life expectancy of vehicles, damages many machines, generates heat, wear and tear, wastage of force/energy, etc. When two things in a forest rub against each other through an amount of force, friction will be present and it will cause a spark. This spark will be continued into a fire because of other materials like wood in the forest causing a forest fire. Secondly, vehicles work through moving many internal machines in them; this again includes friction and friction can damage the machines so to prevent it ppl grease the machines. decreasing life of vehicles is just a larger view of damaging the machines as this disadvantage of friction can be used anywhere. Wastage of force/ energy because when we roll a ball on a surface we have to put force on the ball to make it move forward but because friction moves in the opposite direction energy/force will be wasted there. Generating heat and wear & tear are some factors of friction which is also a harm.
In what ways is thermal energy transferred during physical and chemical changes
Explanation:
chemical changes
>produce new substances w/ different chemical structure/ properties
> thermal energy can be used to BREAK bonds (endothermic)
>thermal energy can be transferred to a chem rxn to help form new products (endothermic)
> heat can be released by an exothermic chemical reaction (excess energy- the total energy used to break bonds is less than energy released in forming new bonds)
physical changes
>does not result in new substances (typically changes in state- solid, liquid, gas)
> thermal energy can be transferred to EVAPORATE water (add thermal E... water (liquid) to steam (gas)) or FREEZE water (remove thermal E... water (liquid) to ice (solid))
What is the velocity?
So velocity means speed (how fast something is moving) with a direction for math and science.
Example: Its the same thing as using the word like: Wow that car has a really high Velocity.
Hope this helps :D
A charged atom or molecule is called an ion.
True
False
Answer:
True
Explanation:
Answer:
True
hopefuly this is helpful
tin shears have longer handles than the scissors used to cut cloth why
Answer:
A pair of scissors used to cut a piece of cloth has blades longer than the handles so that the blades move longer on the cloth than the movement at the handles.
While shears used for cutting metals have short blades and long handles because as it enables us to overcome large resistive force by a small effort.
9) Zane has an elastic water balloon launcher that can fire balloons at an angle of [38.0o] from the surface of the ground. If the initial velocity is 25.0 m/s, find how far away are the balloons are from the launcher when they hit the level ground again.
Answer:
127.6 m
Explanation:
Given that Zane has an elastic water balloon launcher that can fire balloons at an angle of [38.0o] from the surface of the ground. If the initial velocity is 25.0 m/s,
The horizontal initial velocity will be:
U = 25cos38
U = 19.7 m/s
To find how far away are the balloons are from the launcher when they hit the level ground again, we will first calculate the total time spent before using the range formula
To calculate the total time, let's use the formula below:
T = 2U/g
T = (2 × 25)/9.8
T = 50/9.8
T = 5.1s
Range = UT
Since horizontal acceleration = 0
Range = 25 × 5.1
Range = 127.55 m
Therefore, the balloons are approximately 127.6m away from the launcher when they hit the level ground again
A spacecraft orbiting Earth is both moving forward and
a. at terminal velocity
b. experiencing resistance
c. weightless
d. towards earth
Answer: (A) At terminal velocity ...
Explanation:
If a permanent magnet picks up a steel paper clip, the paper clip also
becomes a magnet. How does an electromagnet differ from the magnetized
paper clip?
Answer:
An interaction between electricity and magnetism produces an electromagnet, while a permanent magnet induces the paper clip's magnetic field.
Explanation:
A p e x :)
Someone please help will mark as brainliest
Answer:
yes I agree to his opion cause freedom is important just like everyones rights and if you give up hope i think he means if you give up hope, hope is lost you kind lost everything else
Explanation:
hope it helps a little :)
3. What are the forces present on the rope?
Answer:
The pulling force that acts along a stretched flexible connector, such as a rope or cable, is called tension, T. When a rope supports the weight of an object that is at rest, the tension in the rope is equal to the weight of the object: T = mg.
A sample of a solid nonmetal is compared to a sample of a solid metal. Both samples have the same volume. What is
the most likely difference between the two samples?
The nonmetal has more mass.
O The nonmetal takes up more space.
O The metal has more mass.
O The metal takes up more space.
Plzzz help !!!
Answer:
Ok I’m not pretty sure but I think it’s C but look for more answers first before you put C because I don’t want you to get it wrong. :)
Explanation:
Answer:
i think the answer is The nonmetal takes up more space.
Explanation:
i hope this helps
Where can I find springs that are the same size as the ones in a mechanical pencil
Answer:
Staples, Bestbuy, Maybe Homedepot
Explanation:
Answer:
find the mechanical pencil on amazon
Explanation:
amazon has everything!
HOPETHIS HELPS!
brailiest? please....
Jupiter has many moons that are in its orbit. It largest Ganymede of its smaller moons is Europa. Assuming their the same distance form the planets surface, which moon would experience a stronger gravitational field?
Answer:
Ganymede
Explanation:
Larger size
i need help this is due to day!! i will give brainliest
Answer:
One arm row: Latissmus Dorsi (Lat)
Dumbell flys: Shoulders
Machine back press: pectorals
Push downs: Triceps
Explanation:
gsjsjsjjshsjds
What rules are used to balance a chemical equation?
Answer:
Count the number of hydrogen and oxygen atoms on each side of the arrow.
Explanation:
What is the momentum of a 10 kg object traveling at 4 m/s?*
Answer:
40kg.m/s
Explanation:
∆p=mv. 10kg*4m/s. ∆p= 40Nm
how is gas different from liquid?
Answer:
Gas is different from liquid. Liquid has a definite volume but takes the shape of the container it is in. Gas on the other hand, has no definite shape or volume.
Explanation:
Three people are pulling on a crate , but the crate isn’t moving (it’s at rest ) :Robert and Rachel are pulling to the Right , while Larry is pulling to the Left. If Robert is pulling with force of 74 N, and Larry is pulling with a force of 106 N , how much is Rachel’s force ?
Answer:32
(im not sure if this is right but im just gonna try and explain.)
Explanation: If Larry and the two other people are both pulling at the same force, it wouldn't be able to move.
energy of fossil fuels is also derieved from solar energy
Answer:
Explanation:
All the energy in oil, gas, and coal originally came from the sun, captured through photosynthesis.for example when we burn wood to release energy that trees capture from the sun, we burn fossil fuels to release the energy that ancient plants captured from the sun. We can think of this energy as having been deposited in a natural solar power bank over millions of years.
So, in one sense, gasoline-burning cars, coal-burning power plants, and homes heated by natural gas are all solar powered!
Two cars are on a track and accelerate to 60 mph. At a certain point, both cars slam on the brakes. The distance it takes for each car to stop is then measured.
3. Name the independent variable:
4. Name the dependent variable:
Answer:
'distance' is a 'dependent' variable, and 'stopping' distance is 'an independent' variable.
Explanation:
As we know the independent variable is basically the variable the independent variable is the variable the researcher or a lab person tends to change or control, and its tendency to have a direct effect on the dependent variable.
In this example, two cars are on a track and accelerate to 60 mph. At a certain point, both cars slam on the brakes. The distance it takes for each car to stop is then measured.
It means the 'covering' distance depends upon where the cars tend to stop. It can be a long-distance depending upon how fat the cars go before both cars slam on the brakes.
Therefore, 'distance' is a 'dependent' variable, and 'stopping' distance is 'an independent' variable.
why is it not advisable to touch a canvas tent from inside when it is raining?
Answer: When you touch wet canvas, surface tension will draw water to your finger. However, the drop left behind where you touched, like any irregular point on an overhead surface, will draw condensation from inside the tent if it is humid.
describe how a ramp can make lifting an object easier without changing the amount of work done
Which of the following periodic properties increases as you move from left to right across the periodic table?
A.
nuclear charge
B.
All of these answer choices are correct.
C.
electron affinity
D.
electronegativity
Answer:
the answer choice is B
Explanation:
as we move from left to right , the atomic size decreases due to higher number of protons in the nucleus, which are able to attract the electrons more strongly. and so the electronegativity and electron affinity increases for the same reason. the nuclear charge increase due to more protons , and without an increase in inner electrons , there is less shielding effect. so effective nuclear charge increases.
Answer: B. electronegativity
Explanation: Electronegativity generally increases as you move of the periodic table and as you move to the right. All the other answers listed decrease as you move up a column of the periodic table.
By comparing fossils of a species from long ago to those of today, we can conclude that *
1 point
fossils show no evidence of relationship between the past and present.
past species were more likely to be fossilized than today's.
today's species evolved from those of the past.
present species live longer.
Answer:
today's species evolved from those of the past.
Explanation:
By comparing fossils of a specie from long ago to those of today, we can conclude that today's species evolved from those of the past.
Fossils are the preserved remains of ancient life forms found within sedimentary bed layers. These fossils helps scientists to understand ancient life forms. According to the discovery of Charles Darwin, organisms have evolved and are still evolving. Understanding past life forms gives a way to characterize present day species better.What is the mass of a car traveling at 5.6 m/s with a momentum of 3723 kg*m/s?
Answer:
m = 664.821 kg
General Formulas and Concepts:
Physics
p = mv
p = momentumm = mass (kg)v = velocity (m/s)Explanation:
Step 1: Define variables
m = unknown
p = 3723 kg * m/s
v = 5.6 m/s
Step 2: Find mass
3723 kg * m/s = m(5.6 m/s)
m = 664.821 kg
When dividing, m/s and m/s cancel out to leave kg as our final answerIt is important to increase your flexibility.
true or false?
Answer:
true
Explanation:
is an important component of physical fitness and has many positive effects on the body
Answer:
It's True
Developing flexibility helps yourself:
Fewer injuries. Once you develop strength and flexibility in your body you'll be able to withstand more physical stress.Less pain.Improved posture and balance.A positive state of mind.Greater strength.Improved physical performance.For more question about the topic click/copy the link below:
https://brainly.ph/question/1672452
https://brainly.ph/question/171899
How much force is needed to accelerate a 1.5 kg physics book to an acceleration of 6
m/s^2?
Answer:
Force = 8.0 k g m / s
Explanation:
Force = mass x acceleration
Mass = 4.0 k g Acceleration = 2.0 m / s 2
Hence,force = ( 4.0 x 2.0 ) k g m / s 2 = 8.0 k g m / s 2
Here is the picture of an aircraft, with the forces working on it shown. Identify the force that corresponds to the question mark.
A. Buoyancy
B. Atmospheric pressure
C. Gravity
D. Density
The force corresponds to the question mark in the given figure is known as Gravity. Hence, option (C) is correct.
The given problem is based on the concept of equilibrium of forces. The forces that causes the net motion of an object to be zero, is known as equilibrium of force.
In the given problem, the lift of an aircraft will be due to the Buoyant force due to the air as a medium. The drag acting the opposite direction of motion of aircraft, tends to resist the motion. The thrust force acting on the aircraft is due to the component of aircrafts, which causes the aircraft to move forward.And the question mark shown in problem is somehow pointing the gravitational force, which always acts in downward direction. And gravitational force highlights the gravity.Thus, we can conclude that the force corresponds to the question mark in the given figure is known as Gravity. Hence, option (C) is correct.
Learn more about the gravity here:
https://brainly.com/question/21454806
Which of the following is a field (action-at-a-distance) force?
Fgrav
Ftens
Fspring
Fapp
Answer:
[tex]F_{grav}[/tex] is a field force, as gravity does not physically apply force and does not require proximity.
Explanation:
Of all the Group 13 metals, I am the one with the least mass.
Answer:
Boron has the least mass