W = work done by the spring on the toy car = 196 Joules
m = mass of the toy car = 2 kg
v₀ = initial velocity of the car when at rest = 0 m/s
v = final velocity of the car after spring does work on it = ?
According to work-change in kinetic energy, net work done on an object is same as the change in kinetic energy of the object . hence
Net work done = Final kinetic energy - initial kinetic energy
W = (0.5) m (v² - v₀²)
inserting the values
196 = (0.5) (2) (v² - (0)²)
v² = 196
v = sqrt(196)
v = 14 m/s
The final velocity of the toy cars is 14 m/s
Given data:
The mass of toy car is, m = 2 kg.
The work performed by the spring is, W = 196 J.
In the given problem, the work done by the spring provides the necessary kinetic energy to the toy car. Therefore, work -energy theorem can be applied.
According to work-energy theorem, the work done on an objects is equal to the change in kinetic energy of the object .So,
W = KE
Solving as,
[tex]W = \dfrac{1}{2} mv^{2} \\\\196=\dfrac{1}{2} \times 2 \times v^{2}\\v = 14 \;\rm m/s[/tex]
Thus, we can conclude that the final velocity of the toy cars is 14 m/s .
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Carlos uses a rope to pull his car 30 m to a parking lot because it ran out of gas. If Carlos exerts 2,000 N of force to pull the rope, and the rope is at an angle of 15° to the road, how much work did he do? Round your answer to two significant figures. 1.6 × 104 J 3.5 × 104 J 5.8 × 104 J 9.0 × 104 J
Note that
[tex]W = Fd \cos \theta[/tex]
Thus, here,
W = (2000 N)(30 m)(cos 15) = 57955.54958 J
Here, we only have 2 significant figures. Hence, in 2 significant figures,
[tex]W = 5.8*10^4 \; J[/tex].
Answer:
5.8 × 10^4 J
Explanation:
Four techniques used in propaganda advertising are generalization, scare tactic, exaggeration, and .
and bandwagon is another technique
Facts about thermal energy
Select the community facility which aloows for participation in extreme sports
- Bowling alley
- Golf course
- Skate park
- YMCA
Skate park, definitely.
Hope this helped!
its the skate park>....
If you need to drive from Dallas, Texas, to Salt Lake City, Utah, (about 1500 miles), and the speed limit is 60 miles per hour most of the way, what is the least amount of time you will need?
A.
4 hours
B.
25 hours
C.
2.5 hours
D.
90,000 hours
Assuming (for the least amount of time) that it is 60mph all the way through. Divide the two numbers
1500/60 = 25
B. 25 hours is your answer
~
25 hours.
All you have to do to find out is divide 60 into 1500 and you will get B:25 hours
A 67kg stove is located on the 70th floor of a building (230m above ground). The stove has _______ energy. Calculate it.
Answer:
Potential energy , because it is defined as the energy held by object because of its position relative to other objects.. It is based on its distance from ground
Given data
mass (m) = 67 kg ,
height (h) = 230 m ,
Potential energy (P.E.) = m. g. h
= 67 × 9.81 × 230
= 151172.1 J
P.E. = 151.18 KJ
defonition of quarks
Quarks are fundamental particles that make up other subatomic particles such as protons and neutrons. Quarks are not made up of any other particles.
A slinky is stretched across a classroom and moved up and down at a frequency of 3 Hz. If the corresponding wave velocity is 6.6 m s , determine the wavelength of the slinky wave.
A) 0.45 m
B) 2.2 m
C) 9.9 m
D) 19.8 m
For any wave, Wavelength = (speed) / (frequency).
So the Slinky Wavelength = (6.6 m/s) / (3 / sec)
Wavelength = 2.2 meters .
It takes the compression in the wave 2.2 seconds to travel the length of the classroom.
A 49 N box is to be pulled up a 10 degree ramp at an angle of 40 degrees to the ramp that is 5 m long. The box starts at the base of the ramp. Of the coef of Kinetic friction is 0.1, how hard do you have to pull to make the box to move up the ramp at a constant velocity?
Answer:
17.4 N
Explanation:
According to Newton's second law, the net force acting on the box along the ramp is equal to the product of mass and acceleration:
[tex]F_{net}=ma[/tex]
If we want to move the box at constant velocity, this means acceleration equal to zero: a = 0, so the previous equation becomes:
[tex]F_{net}=0[/tex] (1)
Let's now understand what are the forces exerted on the box along the surface of the ramp:
- The pull (the applied force), let's call it F, which pulls up along the ramp. However, this pull is applied at an angle of 40 degrees, so the actual pull along the ramp will be [tex]F cos 40^{\circ}[/tex]
- The component of the weight parallel to the surface of the ramp, equal to
[tex]-mg sin \theta[/tex]
where (mg) = 49 N is the weight of the box and [tex]\theta=10^{\circ}[/tex] is the angle of the ramp. This force pulls down along the ramp, so we put a negative sign in front of it.
- The frictional force, equals to
[tex]-\mu mg cos \theta[/tex]
where [tex]\mu=0.1[/tex] is the coefficient of friction. This force pulls down along the ramp (in the opposite direction of the motion), so we put a negative sign as well
Therefore, the equation for the net force (1) becomes:
[tex]F cos 40^{\circ}-mg sin \theta -\mu mg cos \theta =0[/tex]
from which we can find the value of F:
[tex]F=\frac{mg sin \theta + \mu mg cos \theta}{cos 40^{\circ}}=\frac{(49 N)(sin 10^{\circ})+(0.1)(49 N)(cos 10^{\circ})}{cos 40^{\circ}}=17.4 N[/tex]
You lift a 50 N object 2 meters off the ground what work did you do on the object
A crane lifts up two boxes.
Which free body diagram shows the forces acting on block A?
Answer:
The 3rd graph
Explanation:
A free body diagram is a diagram which shows all the forces acting on an object.
The problem asks us to find the free body diagram of block A, so we must find all the forces acting on block A.
We have 3 forces acting on block A in total:
- The force of gravity (its weight), which pushes the block downward (in the diagram, it is the force represented with [tex]F_{gA}[/tex]
- The tension in the rope 1, which pulls block A upwards: this force is represented with [tex]F_{T1}[/tex]
- The tension in the rope 2, due to the weight of block 2, which pulls block A downwards: this force is represented with [tex]F_{T2}[/tex]
Based on the direction of these 3 forces, the correct diagram is the 3rd one.
Answer:
t he third graph
Explanation:
Which of the following statements apply to electric charges? please help this is the only question i need done!!
A. There are three types of charges.
B. Like charges attract, opposite charges repel.
C. If a positively charged rod is brought close to a positively charged object, the two objects will repel.
D. If a negatively charged rod is brought close to a positively charged object, the two objects will repel.
The only correct statement on that list is choice-C: If a positively charged rod is brought close to a positively charged object, the two objects will repel.
Answer:
C. If a positively charged rod is brought close to a positively charged object, the two objects will repel.
Explanation:
According to coulomb's law, the magnitude of the electric force between two point charges at rest is directly proportional to the product of the magnitude of both charges and inversely proportional to the square of the distance that separates them. This force is repulsive for like charges and attractive for opposite charges.
What occurs in an updraft
Correct answer: Warm air from the south rises.
PLZ HELP, BRAINLIEST !!
The denser a liquid, the slower it flows. The table below shows the mass and volume of two different liquids.
Comparison of Liquids
Liquid Mass (g) Volume
(cm3)
A 18 10
B 8 20
Which of the two liquids flows slower?
Liquid A flows slower.
Liquid B flows slower.
Both liquids flow equally.
This cannot be determined.
Answer: liquid A flows slower i got it right on the exam
Explanation:
Assuming no friction form air, how far will a dropped rock fall in 10 seconds
Given that
time (t) = 10 s ,
(S) = ?
We know that S = ut+ 1/2 a.t² m
since free fall and no air friction,
a = g = 9.81 m/s² ; initial velocity u= 0
S = 0 + [1/2 × 9.81 ×10²]
S = 490.5 m
The speed of sound in air is about 340 meters per second. How long does it take a sound wave to travel a distance of 7800 meters
22.94 seconds, or in estimation it is 23 seconds.
7,800/340, is how you find that out and so it would take
22.94117647058824 seconds
Low-frequency red light is used in dark rooms because it does not expose the film. This is because the red light has a low
energy. It will not disrupt the picture developing process by overexposing too much light on the film.
The answer is B (energy). I have had this question before and B is correct.
What is the kinetic energy of an object that has a mass of 30 kg and moves with a velocity of 20 m/s?
Given that:
kinetic energy of an object (K.E) = ?
mass of the object (m) = 30 Kg ,
velocity of object (v) = 20 m/s,
We know that,
Kinetic energy is a form of energy, that an object as by reason of its motion.
mathematically,
The kinetic energy of the object (K.E) = 1/2 . (m. v²)
= 1/2.(30 × 20²)
= 6000 Joules
K.E = 6000 J or 6 KJ
The kinetic energy of the object is 6000 Joules
Units ; N.m = J (energy measured in Joules)
KN.m = KJ
Answer:
Kinetic energy of the given object is 6000 J or 6 KJ.
Explanation:
We are given:
mass of the object = 30 kg; and
velocity with which the object moves = 20 m/s.
We know the formula of the kinetic energy:
Kinetic energy = 1/2 × mv[tex]^2[/tex]
Substituting the given values in the above formula to get:
Kinetic energy of object = 1/2 × 30 × 20[tex]^2[/tex] = 6000 J or 6 KJ
What are ph levels? Why are they important? What’s there acceptable level/condition?
pH measures the acidity or alkalinity of a substance, with 7 being neutral.
The term pH is a measure of how acidic or alkaline (basic) a substance is. The pH scale is logarithmic and ranges from 0 to 14, where 7 is considered neutral. A pH below 7 indicates acidity, while a pH above 7 indicates alkalinity. The acceptable level of pH varies depending on the substance and the biological system. For example, in humans, the normal range of blood pH is between 7.35 and 7.45, which is slightly alkaline. Conditions such as acidosis and alkalosis occur when the blood pH falls too low or rises too high, respectively.
Maintaining a consistent pH is crucial in living organisms to ensure optimal conditions for chemical reactions. Even small fluctuations in pH levels can affect protein structure and function, which is critical for life processes. Outside of biological systems, pH levels are also significant in environmental contexts, such as the impact of Acid Rain on the pH of natural waters, which is important for the survival of aquatic life.
Which of the following is one of the three main fuels that a star uses for fusion
Answer:
OXYGEN
Explanation:
from odyssey
Which statement about he diagram is accurate
A. the forces pointing up and down are unbalanced.
B. The forces pointing in and down are balanced
C.The forces pointing right and left are balanced
D.There is a net force of 200 N to the left
B) The forces pointing in and down are balanced
300n on the top and 300n on the bottom results in it being balanced
In the given diagram, the forces pointing up and down are balanced since they are equal in magnitudes and will cancel each other in magnitude.
What is force?Force acting on an object is able to deform it or to change its state of motion or rest. Force is a vector quantity and is characterised by its magnitude and direction.
When two same or different forces are acting in the same direction on an object, the resultant force will be the sum of magnitude of the two forces. If two forces are acting in the opposite directions, they will cancel each other in magnitudes.
In the given diagram, the force acting up and down are equal thus, they will cancel each other and is said to be balanced. The net force to the right direction is 200 N since 200 from 400 N is cancelled by the force with 200 N leftwards. Hence, option b is correct.
To find more on force, refer here:
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Which waves can travel through a vacuum? A) light waves Eliminate B) ocean waves C) sound waves D) mechanical waves
Electromagnetic waves are the waves which can also travel through the vacuum. Example of electromagnetic waves are - Radio waves , micro waves, Infrared waves, Light (visible portion of electromagnetic spectrum), Ultraviolet rays, Xrays and gamma rays.
Hence A that is light waves is the correct option.
The answer is A! I hope this helps!
a 10 kg animal is running at a rate of 3.0 m/s. What is the kinetic energy of the animal?
Answer:
The kinetic energy of the animal is 45 Joule.
Explanation:
Kinetic energy of the animal is given by,
Kinetic energy = [tex]\frac{1}{2} m v^{2}[/tex]
Given: m = 10 kg , v = 3 m/s
Thus,
Kinetic energy = [tex]\frac{1}{2} (10) (3)^{2}[/tex]
Kinetic energy = 45 Joule,
The kinetic energy of the animal is 45 Joule.
Examine the droppler effect illustration above. Assume the red dot is a police car with its siren on. Which direction is the police car traveling
Something is missing in question. But I will try to explain you about Doppler effect to reach your answer.
Answer:
It is defined as "an increase in the frequency of sound, light or other waves as the source or observer moves towards each other".This effect causes the sudden change in pitch noticeable in passing siren. You hear a siren from a few blocks away. The source is a police car that is racing in your direction. As the car approaches, zooms past you, and then speeds off into the distance, the sound of its siren keeps changing in pitch. First the siren gets higher in pitch, and then it suddenly gets lower.
If you on USA TEST prep the answer was "RIGHT"
What are the changes of state
By changes of state if you mean like liquid to gas, solid to liquid etc then the the changes of state would be:
vaporization (Liquid to gas
condensation (gas to liquid)
Sublimation(solid to gas)
Deposition (gas to solid)
Melting (solid to liquid)
Freezing ( liquid to solid)
If you know the amount of air pressure exerted on a tabletop, how can you calculate the force exerted on the tabletop? Multiply the air pressure by the area of the tabletop. Divide the air pressure by the area of the tabletop. Divide the area of the tabletop by the air pressure. Add the air pressure and the area of the tabletop.
Answer:
Multiply the air pressure by the area of the tabletop.
Explanation:
The relationship between pressure, force and area is given by:
[tex]p=\frac{F}{A}[/tex]
where in this case, p is the air pressure, F is the force exerted and A the area of the tabletop. By re-arranging the equation, we can solve for F, the force exerted:
[tex]p=\frac{F}{A}\\p\cdot A=\frac{F}{A}\cdot A\\pA=F[/tex]
So, the correct answer is:
The force exerted on the tabletop can be found by multiplying the air pressure by the area of the tabletop.
A chemistry student mixes 5 grams of sodium chloride (NaCl) in 100 ml of water and stirs until all of the salt is dissolved. Once dissolved, the student measures the electrical conductivity of the solution. An additional 5 grams of NaCl is then dissolved in the solution. Which statement MOST accurately describes how the additional five grams of salt will affect the electrical conductivity of the solution? A) The conductivity of the solution will increase because more ions are being added to the solution. B) The conductivity of the solution will decrease because salt is an insulator and more is being added. C) The conductivity of the solution will decrease because the concentration has changed--the solution is more dense. D) The conductivity of the solution will increase because additional electrical potential is being added to the solution.
Which image shows an inclined plane?
An object at rest increases its velocity to 10m/s in 3 seconds. What is its acceleration
Acceleration = (change in speed) / (time for the change)
Change in speed = (speed at the end) - (speed at the beginning).
Change in speed = (10 m/s) - (zero) = 10 m/s
Time for the change = 3 sec
Acceleration = (10 m/s) / (3 sec)
Acceleration = (3 and 1/3) m/s² or 3.333 m/s²
To calculate the acceleration, use the change in velocity divided by the time. For an object going from rest to 10 m/s in 3 seconds, the acceleration is 3.33 m/s².
The question addresses the calculation of acceleration of an object in motion. To find the acceleration, we can use the formula:
Acceleration (a) = Change in velocity (omenclature) / Time (t)
In this scenario, the object goes from rest (initial velocity, u = 0 m/s) to a final velocity (v) of 10 m/s in a time (t) of 3 seconds.
Thus, acceleration (a) is calculated as:
a = (v - u) / t
a = (10 m/s - 0 m/s) / 3 s
a = 10 m/s / 3 s
a = 3.33 m/s²
The acceleration of the object is therefore 3.33 m/s².
What force is needed to keeps 20kg box moving at a constant velocity when the mk is 0.3021 and the force is applied level to the ground
Answer:
59.2 N
Explanation:
According to Newton's second law, the resultant of the forces acting on the box must be equal to the product between the box's mass and its acceleration:
[tex]F_{net}=ma[/tex]
However, the box is moving at constant velocity, so its acceleration is zero:
a = 0
Therefore, the net force along the direction of motion (parallel to the surface) must be zero.
We have two forces acting along the direction parallel to the ground:
- The applied force, F
- The frictional force, [tex]\mu mg[/tex], in the opposite direction, with [tex]\mu = 0.3021[/tex] being the coefficient of friction, m = 20 kg the mass of the box and g = 9.8 m/s^2
Therefore, the equation of motion becomes:
[tex]F-\mu mg=0[/tex]
And solving for F, we find:
[tex]F=\mu mg=(0.3021)(20 kg)(9.8 m/s^2)=59.2 N[/tex]