Answer:
4 m/s
Explanation:
v=u+ at and v^2=u^2+2as.
It is given that v=0,t=5 s and s=10 m.
⇒0=u+5a and 0=u^2+20a.
⇒a=−u/5 and a=−u^2/20.
⇒u/5 = u^2/20⇒u=4 m/s.
⇒ The initial velocity is 4 m/s.
i just can't get around physics T^T this is the last question i promise, I'd really appreciate the help <3
question; the work one by friction force to stop a car of mass 1000 kg moves with velocity 72km/h is ..........
a) 72 x 10³ J
b) 2 x 10⁴ J
c) 2 x 10⁵ J
d) 4 x 10⁵ J
an explanation for future reference would be great, thank you in advance!
Use the work-energy theorem. The total work W performed on the car as it it slows to a stop is equal to the change in the car's kinetic energy ∆K. So
W = ∆K
W = 0 - 1/2 (1000 kg) (72 km/h)²
W = - (500 kg) (20 m/s)²
W = - 200,000 J = -2 × 10⁵ J
The closest answer would be C, but friction opposes the car's motion so the work would be negative.
How do you break apart a
compound?
A. Chemical bonds must be broken,
B. Water must be added.
C. It must be physically separated.
D. The compound can be cut apart,
Answer:
B
Explanation:
Depends Mostly on bonds electrolysis can be used, chemical bonding like additional of water or by heating back to their elements.
If you want to minimize the amount of current drawn from the solar panel supply, what resistor value should you use for the line resistor (Rline) from your inventory of resistors and why
To minimize the energy loss due to over heating of the solar panel use resistors in parallel arrangement.
Energy loss in a circuitThe amount of energy dissipated in a circuit is determined using the following formulas;
P = I²Rt
where;
I is the currentR is resistancet is timeThus, to minimize the energy loss due to over heating of the solar panel use resistors in parallel arrangement.
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A student picks up four books from the floor, walks across the room through some distance with the book
at the same height and then keeps these books at the new place. In which of these sequence of actions
work is said to be performed ?
Work is performed while initially lifting books off the floor. The work is due to gravity.
A 100 kg object moving at 20 m/s comes to a stop over a distance of 40 m. what is the coefficient of kinetic friction between the object and the ground? (show work please)
Answer:
.5097
Explanation:
Original KE = 1/2 (100)(20)^2 = 20 000 J
the force of friction must work this hard to stop the object in 40 m
Ff *40 = 20 000
Ff = 500 = Fn u u = coeff of kinetic friction
500 = (100)(9.81) u
u = .5097
The kinetic friction coefficient between the object and the ground is 0.5097.
What is kinetic friction?The friction force to normal force ratio experienced by a body moving on a dry, non-smooth surface is denoted by the kinetic friction coefficient k.
Formula :
μk = [tex]\frac{Ff}{Fn}[/tex]
The types and values of the coefficient of friction are determined by the type of resistive force. The coefficient of friction can be determined through experiments such as calculating the amount of power required to overcome friction or calculating the angle at which an object begins to slide off an incline. The kinetic friction coefficient, or k, is the ratio of friction force to normal force felt by a body moving on a dry, uneven surface. Friction can be classified as static, kinetic, deformation, molecular, or rolling. Each one has a different coefficient of friction. Kinetic friction is the force that prevents normal motion after static friction has been overcome.Therefore,
Original KE = 1/2 (100)(20)^2 = 20 000 J
the force of friction must work this hard to stop the object in 40 m
Ff × 40 = 20 000
Ff = 500 = Fnμ μ = coeff of kinetic friction
500 = (100)(9.81) μ
μ = 500/(100 x 9.81)
μ = .5097
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if a stone falls vertically downward from a roof 20m above the ground to a behicle 2m above the ground, the car is known as the________
how can electricity be stopped
Answer:
Insulators such as glass, mica, rubber or plastic used to coat metals and other conductors help stop or reduce the flow of electrical current. This helps prevent shock, fires, and short circuits.
Explanation:
Explain how power loss in a hydraulic system can be minimised during standby
Answer:
there is.loss.of water
in rainy season
in thundering
etc.
Why is nuclear energy able to be used for practical purposes? the reactions are controlled to regulate energy output. the reactions are uncontrolled for maximum energy output. all of the products are fed back into the reaction to keep it going. all of the products are immediately removed to inhibit more reactions.
Nuclear energy is is used practically for many energy requirements because the reactions are controlled to regulate energy output
What is nuclear energy?Nuclear energy is the energy reaelesed during nuclear relations.
Nuclear energy is a clean form of energy which is available in enormous amounts.
Nuclear energy is is used practically for many energy requirements because the reactions are controlled to regulate energy output.
Therefore, the control of nuclear reactions make the use if nuclear energy possible.
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Answer: A or the reactions are controlled to regulate energy output.
Explanation: did it on edge!
2 Using the formula GPE = mxgxh, what are
you solving for?
A. Potential Energy
B. Kinetic Energy
C. Electromagnetic Energy
D. Mass Energy
Answer:
A
Explanation:
THAT is th equation for Potential Energy
What happens to the amplitude of the resultant wave when two sound waves with equal amplitude constructively interfere? a. it is half than the amplitude of each wave. b. it is twice than the amplitude of each wave. c. it is the mean of the amplitudes of the two waves. d. it is the square of the amplitude of each wave. e. it is zero.
The amplitude of the resultant wave when two sound waves with equal amplitude constructively interfere, will be twice than the amplitude of each wave.
What is a constructive interference?
A constructive interference occurs when two sound waves with equal amplitude moving in the same direction collide which each other, forming a single wave (resultant wave) with a higher amplitude.
Thus, we can conclude that the amplitude of the resultant wave when two sound waves with equal amplitude constructively interfere, will be twice than the amplitude of each wave.
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5. A spring balance is used to weigh a fish. The combined mass of the fish and the pan is 1.50
kg. If the spring constant is 1200 N/m. What distance does the spring stretch?
[tex]\\ \rm\Rrightarrow x=\dfrac{2mg}{k}[/tex]
[tex]\\ \rm\Rrightarrow x=\dfrac{2(1.5)(9.8)}{1200}[/tex]
[tex]\\ \rm\Rrightarrow x=\dfrac{3(9.8)}{1200}[/tex]
[tex]\\ \rm\Rrightarrow x=\dfrac{9.8}{400}[/tex]
[tex]\\ \rm\Rrightarrow x=0.0245m[/tex]
2.45cm is distance
What are the potential advantages and disadvantages of a major shift from the hard or traditional path of energy development to the soft or visionary path
Answer: Advantages of following the soft path, the argument here is alternative sources of power such as hydropower, geothermal energy , wind energy , and photovoltaic cells must be developed. This provides a alternative source to remain in a healthy environment and also function as the society we currently live in using the hard path. Disadvantages of following the hard path result with future generations fearing over the irreversible damage of climate change and the damage done to our atmosphere. The hard path argue that we should continue to operate in the future as we have in the past, except more efficiently. This is close to impossible and will only continue the negative effects the hard path( the path we have been following) results in. The major shift determines the outcome of this world, the futures worries or reliefs and ultimately the survival of humans.
Can someone please answer this, ill give you brainliest Would be very appreciated.
Answer:
Option D
Explanation:
The plant burning induces the rate of smokes It also releases carbon dioxide to air with additional to black smokes.As it's released to atmosphere the amount of CO_2 also increases.Option D is correct
We can expect the force of friction to be greater for an object moving on a surface if the surfaces in contact are
a) smooth and the object is heavier
b) smooth and the object is lighter
c) rough and the object is heavier
d) rough and the object is lighter
Answer:
c
Explanation:
Friction is caused by how rough and object is, and how much the object weighs, as this causes it to drag more.
Can someone please answer this, ill give you brainliest Would be very appreciated.
Answer:
See below ~
Explanation:
What is happening to each event as the climate changes? Temperatures are increasing, carbon dioxide levels are increasing, the pH of the ocean is decreasing, sea levels are increasing, and the amount of sea ice is decreasing.
Here are orders of answers from start
IncreasingIncreasingDecreasingincreasingdecreasingThe main reason behind these situations is global warming
The emmison of carbon dioxide has increased a lot which is getting harmful day by day
The blackbody curve for a star named Zeta is shown below. The most intense radiation for this star occurs in what spectral band?
radio waves
infrared
visible light
microwaves
Answer:Visible lighlight
Explanation:
Select the correct answer from each drop-down menu. andrew pokes a marble, and the marble rolls down a ramp. the marble moves with speed. which forces are acting on the marble in this situation? when andrew pokes the marble, he gives it force. as the marble rolls down the ramp, force pulls it down. the movement of the marble is slowed down by from the ramp.
A net forward force as well as gravitational force pulls the marble downwards whereas frictional force slows it down.
What is a force?A force is an agent which causes a change in the motion or state of an object.
Forces are of two types:
Contact forces andNon-contact forcesAndrew applies force on the marble causing it to move.
When Andrew pokes the marble, he gives it net forward force. As the marble rolls down the ramp, gravitational force pulls it down.
The movement of the marble is slowed down by frictional force from the ramp.
Therefore, a combination of applied force and gravitational force moves the marble forward, while frictional force slows it down.
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Answer:
Applied, Gravitational, and Frictional.
Explanation
hope it helps :)
What is the magnitude of the force needed to keep a 60. -newton rubber block moving across level, dry asphalt in a straight line at a constant speed of 2. 0 meters per second?.
Answer:
A force of μk⋅60N is needed to keep a 60-newton rubber block moving across level, dry asphalt in a straight line at a constant speed.
Explanation:
8. What force is needed to accelerate an elevator upward at a rate of 2m's if the mass of the
elevator is 2,350kg
Answer:
F = M a
F = 2350 kg * 2 m/s^2 = 4700 Newtons
That is in addition to the force of
F = 2350 * 9.8 m/s^2 = 23,030 N needed for a stopped elevator
A dolphin leaps out of the water
at 6.25 m/s at a 45.0° angle.
How far away does it land?
(Unit = m)
x max = (vi² sin 2α) / g
x max = (6.25² sin 90)/10
x max = 39.0625/10 = 3.91 m
Select the correct answer from each drop-down menu. thermal energy moves from a to b by . heat transfer will continue until the liquid in b reaches temperature as the liquid in a.
The correct answer from each drop-down menu is thermal energy moves from A to B by conduction the heat transfer will continue until the liquid in B reaches the same temperature as the liquid in A.
What is a heat conductor?Good thermal conductors have an atomic or molecular arrangement that has the property of transferring heat to nearby atoms or molecules until the entire object is in thermal equilibrium. To understand better, let's take a metal bar as an example, which is a good thermal conductor.
In this case, the thermal energy moves from A to B by conduction the heat transfer will continue until the liquid in B reaches the same temperature as the liquid in A.
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A boy starts from a car and skateboards 7 meters towards the west, then continues skateboarding 2 meters towards the west. What is the boy
's displacement from the car?
A 5 meters west
B 7 meters west
C7.6 meters east
D 9 meters west
E 6 meters south
what is an example of digital signals?
Examples of digital signals are Computers, Digital Phones, Digital pens, etc.
What is signal?Signal is defined as an electromagnetic wave that carries information through a medium. In this, the data is converted into electromagnetic signal which may be analog or digital and then sent from sender to receiver.
Signal which are discrete are known as digital signals.
Examples of digital signals are Computers, Digital Phones, Digital pens, etc.
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Answer:
Examples of digital signals are Computers, Digital Phones, Digital pens, etc.
A digital signal is a signal that represents data as a sequence of discrete values. A digital signal can only take on one value from a finite set of possible values at a given time. With digital signals, the physical quantity representing the information can be many things: Variable electric current or voltage.
which best describes why a diamond ring will sometimes sparkle different colors in normal white light?
Coffee or certain cola drinks can be used to test the effect of __________ on reaction time. What drug completes the sentence?
Answer:
"caffeine" both products contain this compound
What's the potential energy for
m= 0.5kg
g=98.1
h=1.5
Answer:
7.36 j
Explanation:
PE = m g h so just mutiply the given values .5 * 9.81 *1.5 = 7.36 j
(assuming 1.5 is in meters)
Can Pineapple be on pizza
Answer:
yes quite a few people love eating Pineapple on pizza
Answer:
yes, if you want pineapple be in pizza
Select the statements that apply in order to complete the model (you can choose multiple answers).
a) the products must equal the reactants.
b) one diatomic oxygen should be removed from the reactant side.
c) one unbonded carbon atom should be added to the product side of the equation.
d) one carbon atom and two oxygen atoms are needed to balance the equation.
e) one carbon dioxide molecule should be added to the product side of the equation.
The statement a,d and e are correct. The chemical equation must be balanced.
What is a chemical reaction ?One or more compounds, known as reactants, are transformed into one or more distinct substances, known as products. Such a process is known as a chemical reaction.
The given equation is;
[tex]\rm CH_4+2O_2 \arrow \rightarrow CO_2+2H_2O[/tex]
The statements that apply in order to complete the model is;
a) The products must equal the reactants.
d) One carbon atom and two oxygen atoms are needed to balance the equation.
e) One carbon dioxide molecule should be added to the product side of the equation.
Hence, statement a,d and e are correct.
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A machine which has an energy loss of 10% will have efficiency of
Answer:
90%
Explanation:
if you lose 10% of a 100 you get 90