Answer:
1. Static friction = not moving
2. sliding friction = moving
3. rolling friction = wheels
4. bumpy the surfaces are
5. how heavy the object is
6. it is easier to keep an object moving
7. static friction is GREATER than sliding friction
Explanation:
Which of these is an example of electrical energy being converted to mechanical energy?
Group of answer choices
Sunlight used by plants in photosynthesis
Ceiling fan
Lightning striking the ground
Answer:
Ceiling fan
Explanation:
A ceiling fan is an example of electrical energy being converted to mechanical energy.
The blades of the fan are driven by motor within the system.
Energy in a system is converted from one form to the other. Energy is neither created nor destroyed as we know from the law of conservation of energy. In this regard, the electrical energy from the outlet powers the motor. As the motor inside the fan spins, the blade in turn begins to rotate. The motion of the blade is the expression of mechanical energy.HELP ASAP!!! How many electrons fit into each electron shell?
K
L
M
N
Answer:
k = 2
L = 8
M = 18
N = 32
plz mark me as a brainelist
The acceleration due to gravity on the earths surface is?
Acceleration due to gravity depends directly on the mass of Earth and inversely to the square of radius of Earth.
Answer:
9.8 m/s2
Explanation:
Acceleration due to gravity is the acceleration gained by an object due to the gravitational force. Its SI unit is m/s 2. It has both magnitude and direction, hence, it’s a vector quantity. Acceleration due to gravity is represented by g. The standard value of g on the surface of the earth at sea level is 9.8 m/s2.
What kind of energy is stored when you stretch a spring?
A. Kinetic energy
B. Chemical energy
C. Elastic energy
D. Gravitational potential energy
Answer:
it's B
Explanation:
Elastic potential energy is energy stored as a result of applying a force to deform an elastic objects. The energy is stored until the force is removed and the object springs back to it's original shape, doing work in the process. The deformation could involve compressing, stretching or twisting the object
Answer: Elastic energy
Explanation:
A PE X
The tree branch in the preceding problem sags, and the child's feet rest on the ground. If the tension in the rope is reduced to 220 N, what is the value of the normal force being exerted on the child's feet?
The complete question is
A 45-kg child sits on a 3.2-kg tire swing. The tension on the rope is 470 N. The tree branch sags and the child's feet rest on the ground. If the tension in the rope is reduced to 220 N, what is the value of the normal force being exerted on the child's feet?
Answer:
Therefore the Normal force is being exerted on the child's feet is 252.36( 250N).
Explanation:
We are given
mass of child = 45kg
mass of the tire = 3.2kg
g = 9.8 m/s^2
We have the first case in which the tire is in swing so tension in that case will be which is the resultant force.
Fr = Resultant force
Ft = Tension force
Fg= Gravitational force
Fr = Fg + Ft
0 = -mg + Ft
Ft = mg
= (45+3.2)*9.8
= 48.2 * 9.8
Ft = 472.36N ( which is close to 470)
In the second case the child is in the rest position, The resultant force will be zero.
Fr = Ft + Fn + Fg ( Normal force is denoted by Fn )
0 = Ft + Fn + Fg
Fn = -Fg -Ft
Fn = mg -Ft
= 472.36 - 220
Fn = 252.36N ( close to 250N)
Therefore the Normal force being exerted on the child's feet will be 252.36N.
Arif decided to make a model of the global wind patterns on Earth. He draws arrows of the global winds that move in a circular pattern from the equator to the poles and back again. Explain what causes global winds to form. Why do they move in convection currents around Earth? Please help
Answer:
The Earth's rotation which produces Coriolis force is the responsing factor for the formation and movement of different global winds.
The cause of the global winds is due to the rotation of the earth that produces the Coriolis force factor for the formation and movement of global winds.
What are global wind patterns?The global wind pattern is formed by the movement of the earth and they are polar easterlies, prevailing westerlies and the trade winds.
Each of them occurs at about 30 degrees of latitude. Hence they form wind belts. The Coriolis effect that is created due to the rotation of the earth is a fact that leads to the movement of global winds.
Find out more information about the earth.
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Chapter 5 Review Questions
How would you calculate the spring constant of an unknown spring?
A. graph the force vs. extension of the spring and find the slope
B. Use Hooke's law to calculate the spring constant knowing one force of the spring and one deformation of the spring
C. graph the force vs. extension of the spring and find the inverse of the slope
D. conduct a series of experiments with different amounts of deformation on the spring and calculate spring constant with Hooke's Law
How can humans use their knowledge of changing states of matter to better society? (ex. A human can harness the thermal energy from transitioning water from a liquid state to a gas state.)
Please Hurry This assignment is due tonight.
Write 5 sentences why. Thanks
Answer:
Anything that has mass is made up of matter – an all-encompassing word for atoms and molecules that make up our physical world. We describe this matter as existing in states (sometimes referred to as phases). Most people are familiar with three states of matter – solids, liquids and gases – but there are two more that are less commonly known but just as important – plasmas and Bose-Einstein condensates
Janet jumps horizontally off a high diving platform with a velocity of 2.76 m/s and lands in the water 2.3 s later. How high is the platform? The acceleration of gravity is 9.8 m/s. Answer in units of m.
How far from the base of the platform does she land? Answer and units of m.
Answer:
(a) Let the height of the platform is h meter,
=>By s = ut + 1/2gt^2
=>h = 0 + 1/2 x 9.8 x (2.3)^2
=>h = 25.92 m
(b) By R = [Ux] x t
=>R = 2.47 x 2.3
=>R = 5.68 m
Explanation:
Explanation:
From the exercise we know the initial horizontal velocity and the time that Janet takes to land in the water
a) Knowing the formula for free falling objects, we can calculate how high is the platform
At t=2.3m the position of Janet is y=0m
So, the platform is 26m tall
b) According to dynamics the displacement of an object can be analyze using the following formula:
So, Janet lands 6 m far from the base of the platform
Which of these is not a method of preventing the corrosion of metals?
A) galvanising
B) painting
C) plating
D) rusting
Answer:
D
Explanation:
rusting is actually the corrosion of metals so it can't be a way to prevent itself.
Which of these games was a racing game?
A.
Centipede
B.
Pole Position
C.
Xevious
D.
Galaxian
E.
Space Invaders
Answer:
B.
pole position
A bicyclist with a mass of 50 kg is traveling at a rate of 30 m/s. It accelerates to a rate of 50 m/s in 5 seconds. What is the net force acting on the bicycle? *
Answer:
F=m*(v^2/r)
F=82*(8^2/30)
F=174.9N
Explanation:
brainlest pls
4. If you fall out of a plane and point your head down, it would take about 5 s to
reach a velocity of 49.1 m/s downward. What is the acceleration of gravity?
Answer:
acceleration due to gravity is always going to be 9.8m/s^2 whenever an object is freely falling.
Explanation:
You could also divide 49.1 m/s by 5s to get an acceleration of 9.8 m/s^2 as well.
a man walks 30 meters north,then 90 meters east, and then 30 meters south
Explanation:
D = 30+90+30
= 150m
.............
what's the question
A person pours some chlorine bleach into a clothes washer to remove stains from the clothing. What is one chemical property or the bleach?
A. It’s density
B. It’s mass
C. It’s color
D. It’s pH
One chemical property of the bleach is its pH.
What is pH?This is referred to as the power of hydrogen and is a measure of how acidic/basic a substance is.
pH is an example of chemical property because it's associated with a change in its chemical composition. This thereby makes option D the most appropriate choice.
Read more about pH here https://brainly.com/question/4137247
Answer: It's pH
Explanation: I took the test
Two ice skaters are at rest and facing each other. In order to move, they push
off each other. What is known about their final total momentum?
A. One skater must remain at rest.
B. Nothing is known about the final total momentum.
C. The final total momentum must equal zero.
D. Since they are on ice, this will not work. Neither can move.
Answer:
A
Explanation:
Hopefully this helps
Two ice skaters are at rest and facing each other. In order to move, they push off each other, then their net final total momentum must equal zero, therefore the correct answer is option C.
What is momentum?
It can be defined as the product of the mass and the speed of the particle, it represents the combined effect of mass and the speed of any particle, and the momentum of any particle is expressed in Kg m/s unit.
As given in the problem statement two ice skaters are at rest and facing each other. In order to move, they push off each other,
By using the conservation of the momentum,
The initial total momentum of two skaters = the final total momentum of the skaters
Since, initially, they are at rest and their initial total momentum is zero therefore the correct answer is option B
To learn more about momentum from here, refer to the link;
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CAN SOMEONE HELP ME WITH THIS QUESTION!!
Answer:
The one you have selected
Explanation:
That is right
As the distance between two charged particles increases, the force of attraction __________(increases/decreases). This is a(n) __________ (direct/indirect) relationship. Explain your evidence and reasoning with observations from the simulation.
Answer: decreases.
direct.
Explanation:
when you have two objects which are far apart from each other, when the distance increases the forces of attraction decreases and vice versa when the distance decreases the forces of attraction also increases.
this is a direct relationship, from careful observation and monitoring of the simulation, a pattern is noticeable by which an increase in one variable causes an opposite effect on the other variable.
how many cups are in 4 gallons
Answer:
there are 64 cups
Explanation:
remember this: two cups in a pint, two pints in a quart, two pints in a quart, four quarts in a gallonl2
Wish me Luck ! ! !
Im about to take my Fall 2020 Semester Physics Exam!
Answer:
Good Luck :)
Have a great day:)
An object is thrown straight up into the air with an initial speed of 8 m/s, and reaches a greatest height of 15 m before it falls back to the ground. a. What height is the object thrown from? b. How long does it take for the object to hit the ground?
Answer:
The value is [tex]T_t = 2.5659 \ s[/tex]
Explanation:
From the we are told that
The initial speed of the object is [tex]u = 8 \ m/s[/tex]
The greatest height it reached is [tex]h = 15 \ m[/tex]
Generally from kinematic equation we have that
[tex]v^2 = u^2 + 2gH[/tex]
At maximum height v = 0 m/s
So
[tex]0^2 = 8^2 + 2 * - 9.8 * H[/tex]
=> [tex]H = 3.27 \ m[/tex]
Here H is the height from the initial height to the maximum height
So the initial height is mathematically represented as
[tex]s = h - H[/tex]
=> [tex]s = 15 - 3.27[/tex]
=> [tex]s = 11.73 \ m[/tex]
Generally the time taken for the object to reach maximum height is mathematically evaluated using kinematic equation as follows
[tex]v = u + (-g) t[/tex]
At maximum height v = 0 m/s
[tex]0 = 8 - 9.8t[/tex]
=> [tex]t = 0.8163 \ s[/tex]
Generally the time taken for the object to move from the maximum height to the ground is mathematically using kinematic equation as follows
[tex]h = ut_1 + \frac{1}{2} gt_1^2[/tex]
Here the initial velocity is 0 m/s given that its the velocity at maximum height
Also g is positive because we are moving in the direction of gravity
So
[tex]15 = 0* t + 4.9 t^2[/tex]
=> [tex]t_1 = 1.7496[/tex]
Generally the total time taken is mathematically represented as
[tex]T_t = t + t_1[/tex]
=> [tex]T_t = 0.8163 + 1.7496[/tex]
=> [tex]T_t = 2.5659 \ s[/tex]
water starts to freeze from top whereas wax starts to freeze from bottom?why?
Answer:
im pretty sure its because wax has i higher melting point therefore it would cool quicker if the temperature dropped more. water has a lower melting point so it takes longer to freeze i think. i hope this helps
Water and wax freeze from different directions due to the unique properties and behaviors of these substances.
Water:
When water freezes, it undergoes a phase transition from a liquid to a solid state.
Unlike most substances, water exhibits an unusual property known as the "anomalous expansion of water" or "density anomaly." This anomaly is caused by the hydrogen bonding between water molecules.
As the water cools down, its molecules begin to slow down and move closer together. This causes the density of the water to increase. However, as the water reaches around 4 degrees Celsius (39 degrees Fahrenheit), it starts to behave differently.
The hydrogen bonds between water molecules become more organized and stable, causing the water to expand and become less dense.
Wax:
Wax, on the other hand, does not exhibit the same density anomaly as water. When wax undergoes solidification, it follows a different pattern due to its molecular structure and the way its particles arrange themselves.
Wax typically consists of long, nonpolar hydrocarbon chains. As it cools, the wax molecules start to lose kinetic energy, slowing down their movement.
The intermolecular forces between the wax molecules become stronger, causing them to come closer together.
In summary, water freezes from the top due to its density anomaly, with the less dense, expanded water rising and forming a layer of ice on the surface.
Wax, however, freezes from the bottom as its molecules arrange and bond together, gradually solidifying upwards. These differences in freezing behavior are influenced by the distinct properties and molecular structures of water and wax.
Know more about hydrogen bonds:
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Help me PLEASE! 25 points!!!!! :)
Answer:
A.
Explanation:
All the arrows align to the point right
A student named Bob is on a bike and the mass is 50 kg. The force causes the student to accelerate at 3 m/s to the power of 2. Calculate the net force that causes this acceleration.???
Answer:
150 N
Explanation:
Force is equal to mass times acceleration. 50 kg accelerating at a mass of 3m/3² is undergoing a force of 150 m/s², or 150 Newtons
A 10 N force and an 18 N force act in the same direction on an object. What is the net force on the object?
Answer:
28 N
Explanation:
From the question given above, we were told that 10 N force and 18 N force act in the same direction on the object.
The net force acting on the object can be obtained by simply adding both forces together since they both act on the object in the same direction. This is illustrated below:
Force 1 (F₁) = 10 N
Force 2 (F₂) = 18 N
Net force (Fₙ) =?
Fₙ = F₁ + F₂ (since they both act in the same direction)
Fₙ = 10 + 18
Fₙ = 28 N
Therefore, the net force acting on the object is 28 N.
_______________ is the name for the permanent destruction and clearing of forests
Answer:
DeforestationExplanation:
__________________________________________________________
According to Vocal Media,
__________________________________________________________
Deforestation is the permanent destruction of forests in order to utilize the land or trees. Typically, deforestation is clearing a lot of trees without the intention of establishing future growth. Harvesting, forest fires, and insect infestations do not count as deforestation because the affected areas will eventually grow back.
__________________________________________________________
Hope this helps! <3
__________________________________________________________
HELP ASAP
The Target employees are working hard to get the orders out to everyone. The employees need to move packages from the ground level to the top of the loading dock platform. As shown in Figure 1, the employee pushes the package up a ramp (you may assume friction is negligible). In figure 2, the employee lifts the package straight up from ground to the loading dock platform. In which case does the employee do more work on the box and why?
a
Lifting the box straight up, because the incline acts as a simple machine and reduces the force required
b
Lifting the box straight up, because it requires a larger applied force to lift it straight up
c
Pushing the box up the incline, because the force is applied for a longer distance
d
Neither method, because the work is the same in both cases, since using the ramp decreases the force by the same factor that it increases the distance
Answer:
I believe the answer is B
help i hope this actually works
Answer:
it does tbh.
Explanation:
A student wearing a frictionless roller skates on a horizontal is pushed by a friend with a constant force of 55N. How far must the student be pushed, starting from rest, so that her final kinetic energy is 362 J
Answer:
6.58m
Explanation:
The kinetic energy = Workdone on the roller
Workdone = Force * distance
Given
KE = Workdone = 362J
Force = 55N
Required
Distance
Substitute into the formula;
Workdone = Force * distance
362 = 55d
d = 362/55
d = 6.58m
Hence the student must push at a distance of 6.58m
Which is the correct equation for the force applied by a spring?
Answer:
B. [tex]F = -k*x[/tex]
Explanation:
The force of a spring can be easily calculated using Hooke's law which tells us that the force applied on a spring is equal to the product of the constant of a spring by the compressed or stretched distance of the spring.
That is:
[tex]F = k*x[/tex]
k = spring constant [N/m]
x = distance [m]
