a skateboard with a negative acceleration, which of the following statements is always true
Answers
The initial velocity of the skateboard will be greater than its final velocity.
The correct option is C.
What is acceleration ?Acceleration is the rate at which the speed and direction of velocity vary over time. A point or object going straight ahead gets accelerated when it accelerates or decelerates. Even if the speed decreases, movement on a circle accelerates because the direction is always shifting.
Is speed acceleration?We refer to a change in an object's speed or direction as acceleration. The rate at which speed varies is known as acceleration. Keep in mind that velocity has two parts: speed and direction.
Can acceleration have a negative ?Our theory says that an object accelerates in the reverse direction from the velocity when it slows down. As a result, the object is moving backwards.
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The complete question is-
For a skateboard with a negative acceleration, which of the following statements is always true?
A. The skateboard is losing speed
B. The final velocity of the scooter will be negative
C. The initial velocity of the skateboard will be greater than its final velocity
D. The skateboard will have a negative displacement
Related Questions
1) Keeping in mind what you did in the lab this week, do you think that determining the volumes of your solid samples (rubber stopper, crock stopper, and pennies) by measuring their dimensions and calculating it mathematically would be more or less accurate than determining their volumes by water displacement? Explain.
2) Do you think that the water displacement method will work for calculating the density of a tablespoon of sugar? Explain.
Answers
Determining the volumes of solid samples by measuring their dimensions and calculating it mathematically may be less accurate than determining their volumes by water displacement. Yes, the water displacement method can work for calculating the density of a tablespoon of sugar.
This is because the dimensions of the objects may not be perfectly uniform and there may be small irregularities that could lead to inaccuracies in the calculated volume. Water displacement, on the other hand, provides a more accurate measure of the volume of irregularly shaped objects.
This method involves measuring the volume of water displaced by the sugar when it is added to a graduated cylinder of water. The difference between the initial and final water levels gives the volume of the sugar. The mass of the sugar can then be measured using a scale.
The density can be calculated by dividing the mass of the sugar by its volume. However, it is important to ensure that the sugar is fully dissolved in the water to obtain an accurate measurement.
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The speed, v, of an object moving along a straight line can be given in terms of time, t by v = at +b/(t-c)where a, b, c are constants. Assume, the expression is physically correct. If the dimensions of v are L/T, determine the dimensions of the terms a, b and c. Carefully layout your procedure.
Answers
Given
\(v=at+\frac{b}{t-c}\)
Procedure
Dimensions of v are L/T
The answer would be:
\(LT^{-2},L\text{ and T}\)The letter a is multiplying to one dimension in time, so it must be a value of distance over two of time. LT^(-2)
The letter b is in the numerator so it must be a distance dimension. L
The letter c is being operated as a subtraction in the denominator so it must be time T
Plane used to remove the tip of your nose
A. Transverse (top/bottom)
B. Sagittal (sides)
C. Frontal (front/back)
Answers
Plane used to remove the tip of your nose is known to be called option C. Frontal (front/back).
What is another name for the coronal plane?In regards to biology, If a person were to cut their nose off, it is one that is known to be called coronal.
The coronal plane is said to be a term that is often referred to as the frontal plane and it is seen as any vertical plane that shares the body into ventral as well as dorsal (belly and back) parts.
Therefore one can say that the coronal Plane (Frontal plane) used to remove the tip of your nose.
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What would happen to your food web if the population of a tertiary consumer was to
double?
Answers
In the food web if the population of a tertiary consumer was to
double the secondary consumer population would decreased.
In the food web If the population of a tertiary consumer was to
double , the following would happen :
1) This will decrease the secondary consumer population due to the more predator's.
2) this will lead to increase in the primary consumers as the secondary consumers decreases and they will have fewer predators.
3) The tertiary consumers will also decreases after some time because they will not have enough food to their survival.
Thus, In the food web if the population of a tertiary consumer was to
double the secondary consumer population would decreased.
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What are the three stages of matter and how?
Answers
Answer:
Solid, Liquid and Gas
Explanation:
They are the 3 states or stages of Matter
A cylindrical tank with radius 5 m is being filled with water at a rate of 2 m3/min. How fast is the height of the water increasing?.
Answers
V(volume of cylinder) = A.h = πr².h
V = 25π.h m³
rate (Q) = V : t
\(\tt t=\dfrac{V}{Q}=\dfrac{25\pi h~m^3}{2~m^3/min}=12.5\pi h~min\)
Convection is the transfer of heat energy by:
A Molecular contact
B Electromagnetic waves
C Density Differences
D Movement through a vacuum
Answers
the answer is a molecular contact I am pretty sure
Newton's version of Kepler's third law states: p^2 = ((4π^2/G (M 1 + M 2)) x a^3 Solve this equation to find the combined mass of a planet and its satellite, given the orbital period and average separation.
Answers
To find the combined mass of a planet and its satellite using Newton's version of Kepler's third law, use the formula M1 + M2 = \((p^2 * G)/(4\pi ^2 * a^3)\), where p is the orbital period and a is the average separation between the planet and its satellite.
To tackle for the joined mass of a planet and its satellite utilizing Newton's variant of Kepler's third regulation, we really want to modify the recipe as follows:
M1 + M2 = \((p^2 * G)/(4\pi ^2 * a^3)\)
Where M1 and M2 are the majority of the planet and its satellite, individually, p is the orbital period, an is the typical detachment between the planet and its satellite, and G is the gravitational steady.To utilize this equation, we want to know the upsides of p and a.
When we have these qualities, we can plug them into the equation and compute the joined mass of the planet and its satellite.It's important that this equation expects a roundabout circle, which may not generally be the situation truly.
What's more, it accepts that the planet and satellite are the main articles in the framework, which may likewise not be the situation. In any case, this equation gives a helpful gauge of the joined mass of a planet and its satellite in light of their orbital qualities.
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A boy is running at -8 m/s and a girl running at -2 m/s. Who is running faster? How do you know?
Answers
Answer:
the girl is running faster because -2 is greater than -8
Explanation:
WILL GIVE BRAINLIST
brief history of coal. the inventors of who discovered coal and when was it first used.
Answers
Answer:
Coal was one of man's earliest sources of heat and light. The Chinese were known to have used it more than 3,000 years ago. The first recorded discovery of coal in this country was by French explorers on the Illinois River in 1679, and the earliest recorded commercial mining occurred near Richmond, Virginia, in 1748
Explanation:
A steer must eat at least 100 pounds of grain to gain less than 10 pounds of muscle tissue. This illustrates Group of answer choices the second law of thermodynamics. that some energy is destroyed in every energy conversion. the first law of thermodynamics. that energy transformations are typically 100% efficient.
Answers
Answer:
the second law of thermodynamics. that some energy is destroyed in every energy conversion.
Explanation:
According to the second law of thermodynamics, energy conversion is never 100% efficient. Some energy is always lost as it is being converted from one form to the other.
The fact that a steer must eat at least 100 pounds of grain to gain less than 10 pounds of muscle tissue shows that not all the energy taken up from the grain is channelled towards building the muscle tissue. Some energy from the grains are lost on the way according to the second law of thermodynamics.
Suppose that you took off your sweater and noticed that your hair was standing up. Using six electrons as an example, and assuming that the electrons are transferred from the sweater to your hair, draw a series of diagrams showing how the excess electrons in your hair could be discharged
(a) to your neutral hand
(b) to the neutral ground
Answers
Until the charges in both of your hands and your hair are equal, electrons migrate from one to the other. Your hair is not adversely charged any longer. Diagram: Ground (neutral), Sweater, Hair (-), and Body (-).
The charge of human hair is it positive or negative?According to Thomas, hair naturally possesses a negative charge that is isolated by the lipid layer that covers our hair, which is similar to static electricity. Frizz is caused by damaged hair's increased negative charge, which causes the hairs to physically strive to separate from one another.
Why does hair have a negative charge?Human hair that has not been treated has a very negative surface charge. The carboxyl groups of glutamine, aspartic acid, and sulfonic acid groups in the hair are responsible for this characteristic.
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which landform was most affected by erosion (had the most sediment displaced)? why? answer in 2–3 complete sentences.
Answers
The landform that was most affected by erosion and experienced the highest amount of sediment displacement is the riverbed. This is due to the constant flow of water, which exerts a significant force on the riverbed.
Among various landforms, rivers are particularly susceptible to erosion and sediment displacement. The continuous flow of water in rivers exerts hydraulic pressure, which plays a crucial role in erosion. As water moves downstream, it carries sediments and debris along with it. The force of the flowing water can dislodge rocks, soil, and other loose materials from the riverbed, resulting in erosion.
Additionally, the velocity and volume of water in rivers can vary significantly, especially during heavy rainfalls or floods, further increasing the erosive power. This continuous erosion and transport of sediment contribute to the formation and reshaping of river valleys, as well as the deposition of sediment in delta regions and floodplains. Consequently, the riverbed stands out as the landform most affected by erosion and the one with the highest amount of sediment displaced.
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What is the highest and lowest pressure?
Answers
The highest pressure is found in the depths of the ocean and the lowest pressure can be found in the Earth's atmosphere at high altitudes, such as in a vacuum.
Pressure is a measure of the force exerted by a fluid per unit area and it can vary greatly depending on the environment. The highest pressure is found in the depths of the ocean, where the pressure from the weight of the water column above increases with depth.
On the other hand, the lowest pressure can be found in the Earth's atmosphere at high altitudes, such as in a vacuum. A vacuum is a region with no matter, and thus no pressure, and is often found in outer space.
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Weighing a Bacterium Scientists are using tiny, nanoscale cantilevers 4 micrometers long and 500 nanometers wide-essentially miniature diving boards-as a sensitive way to measure mass. The cantilevers oscillate up and down with a frequency that depends on the mass placed near the tip, and a laser beam is used to measure the frequency. A single E. coli bacterium was measured to have a mass of 710 femtograms = 7.10×10−16 kg with this device, as the cantilever oscillated with a frequency of 17.1 MHz .
Treating the cantilever as an ideal, massless spring, find its effective force constant.
Answers
If we consider the cantilever to be a perfect, massless spring, then K = 5.952N/m is its effective force constant.
How does science define force?The meaning of the term "force" is obvious. At about this point, it's perfectly permissible to describe a force as shoving or pulling. An object doesn't "have a force in it" or "contain a force." A force is applied to one thing by another.
Why is force such a big deal?A force can be a push or a pull, and it affects how we go about our daily lives because we can't open or close items, raise our legs or arms or accomplish a lot more without it.
BriefingNumerous E coli bacteria, m = 7.10 × 10⁻¹⁶
frequency =17.1 MHz
frequency of vibration, F = 1/2π√K/M
17.1×10⁶= 1/2π√K/ 7.10 × 10⁻¹⁶
K/ 7.10 × 10⁻¹⁶ = 7.10 ×10¹⁵
K = 5.952N/m
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Physical Science Essential Question: How can the scientific process be used to help us investigate and understand natural phenomena? Elaborate: Challenge students to pretend they are on the scientific journey to develop a vaccine to stop the zombie apocalypse and they need to design an experiment as a result of working in a laboratory. Ask the students to write 2-3 paragraphs describing what they would test and why might this be important in science and the real world. They might need to include the following terms: Experimental design
Test variable
•Outcome
•Control variable
•Hypothesis
•Testable
•Graphs and charts
Answers
Answer:
It C 100% bc i alrweady learn this
How does a presidential veto affect a bill passed by Congress?
Responses
A It changes a bill passed by Congress to suit the president, who will send it back to Congress to pass or reject with a simple majority vote.
B It delays a bill passed by Congress from becoming law for one full year, after which the president must sign the bill into law.
C It passes a bill approved by Congress and becomes law as soon as the Supreme Court rules it to be constitutional.
D It kills a bill passed by Congress unless Congress votes to override the veto with a two-thirds majority in each house.
Answers
Answer:
If the President vetoes the bill it is sent back to Congress with a note listing his/her reasons. The chamber that originated the legislation can attempt to override the veto by a vote of two-thirds of those present. If the veto of the bill is overridden in both chambers then it becomes law.
Explanation:
Study the interaction of the light rays with the mediums. Classify the medium in each image as being transparent or opaque.
Answers
Answer:
a) transparent
b) transparent
c) opaque
Explanation:
In the first one, the light rays go completely through, so it is transparent.
The second one I'm not too sure about. It is refraction so it's going through a different material, but the fact that it went through makes me say transparent.
Last one, the light rays are reflecting off the surface so it's opaque.
Please feel free to correct me if I'm wrong. This is just my understanding
a motorcyclist is coasting with the engine off at a steady speed of 28.5 m/s but enters a sandy stretch where the coefficient of kinetic friction is 0.65. part a will the cyclist emerge from the muddy stretch without having to start the engine if the sand lasts for 14 m ? will the cyclist emerge from the muddy stretch without having to start the engine if the sand lasts for 14 ? no yes
Answers
Yes, the cyclist will emerge from the muddy stretch without having to start the engine if the sand lasts for 14 with a final velocity of 31.47 m/s
Initial Speed (u) = 28.5 m/s
Coefficient of kinetic friction(µ) = 0.65
Distance traveled (s) = 14 m
Acceleration (a) = -µg = -0.65*9.8 = -6.37 m/\(s^{2}\)
Now, Applying the 3rd equation of motion, we have:
\(v^{2} -u^{2} =2as\)
\(v^{2} -(28.5)^{2} = 2*(-6.37)*14\\\\v^{2} = 178.36 + 812.25 = 990.61\\\\v = 31.47\)
Hence, the final speed will be 31.47 m/s
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a man of mass 60 60 kg, runs up the stairs of total height 5 5 meters in 4 4 seconds. how much power is exerted by the man?
Answers
The power exerted by the man is 735 watts.
To find the power exerted by the man, we need to use the formula for power, which is:
Power = Work / Time
Work is the product of force and displacement, so we can write the formula as:
Power = (Force × Displacement) / Time
We know that the displacement is 5 meters and the time is 4 seconds. To find the force, we need to use the formula for weight, which is:
Weight = Mass × Acceleration
The acceleration in this case is the acceleration due to gravity, which is 9.8 m/s². So the weight of the man is:
Weight = 60 kg × 9.8 m/s² = 588 N
Now we can plug in the values into the formula for power:
Power = (588 N × 5 m) / 4 s = 735 Nm/s = 735 W
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1) If CB = 13; BF = 9; EF = 7 THEN DE = ?
(Hint: (whole secant) (external part) = (whole secant) (external part)
Answers
The value of length of secant DE in the intersecting secants is determined as 21.3.
What is the length of DE?The length of segment DE is calculated by applying the following theorem of intersecting secants.
This theorem states that the product of two secants of a chord is equal to the product of the two secants of the second chord.
From the given diagram, we will have the following equation;
(whole secant) (external part) = (whole secant) (external part)
BF x (FC) = EF x ( FD)
The given parameters;
length CB = 13
length BF = 9
length EF = 7
Length FD = DE + EF = DE + 7
Length FC = CB + BF = 13 + 9 = 22
The value of length of DE is calculated as follows;
9 x 22 = 7(DE + 7 )
198 = 7DE + 49
7DE = 149
DE = 149/7
DE = 21.3
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The missing diagram is in the image attached.
A car travels from point A to point B in 3.991 hours and returns back to point A in 4.109 hours. Points A and B are 134.2 miles apart along a straight highway. What was the car's average speed and average velocity over this time period?
Answers
Answer:
gjsgjdcjpdcojdcoj gud gud gud gud gud gud gud gud gud gud gud gud gud gud get home h hum h hum hth hai h h g c b c b v g c h x corolla
The average speed of the car over this time period is 38.6 miles per hour. The average velocity of the car over this time period is 0 miles per hour.
The average speed of an object is the total distance traveled divided by the total time taken to travel that distance. In this case, the car travels a total distance of 134.2 miles in a total time of 3.991 + 4.109 = 8.1 hours. This means that the car's average speed is 134.2 miles / 8.1 hours = 38.6 miles per hour.
The average velocity of an object is the total displacement of the object divided by the total time taken to make that displacement. In this case, the car returns to its starting point, so its displacement is 0 miles. This means that the car's average velocity is 0 miles / 8.1 hours = 0 miles per hour.
Average speed and average velocity are not the same thing. Average speed only takes into account the distance traveled, while average velocity takes into account the displacement of the object. In this case, the car's displacement is 0, so its average velocity is 0.
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In workplaces where there is continuous noise e.g. mines, workers are encouraged to wear protective gears such as ear muffs provided by the company. This will reduce the noise going into workers ears hence reducing compensation costs. These protective gears have limitations in that they are damaged upon usage, as nothing lasts forever. Workers on the other hand tend to remove their protective gears with the view that they are uncomfortable or they want to hear their colleagues clearly.
Explain the likely reasons for weakening muffs effectiveness.
Answers
In workplaces with continuous noise, such as mines, the use of protective gear like ear muffs is encouraged to reduce the amount of noise entering workers' ears. This not only protects their hearing but also helps decrease compensation costs associated with hearing-related injuries.
However, it is important to recognize that these protective gears have limitations. Over time and with extensive use, they can become damaged and less effective at reducing noise exposure. Despite the importance of wearing protective gear, some workers may choose to remove their ear muffs due to discomfort or the desire to hear their colleagues more clearly. This poses a challenge as it increases their risk of being exposed to excessive noise levels, which can lead to hearing damage or loss.
To address this issue, employers should focus on providing comfortable and properly fitting protective gear that minimizes discomfort. Additionally, regular training and awareness programs can emphasize the importance of consistent use of protective gear and educate workers about the potential long-term consequences of noise exposure. Encouraging an open dialogue between workers and management can also help address any concerns or misconceptions related to the use of protective gear.
Ultimately, striking a balance between comfort and safety is crucial. Employers should strive to provide effective and comfortable protective gear, while workers need to understand the importance of consistent usage to safeguard their hearing health in noisy work environments.
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what is meant by fundamental unit? write any two difference between mass and weight.
Answers
Answer:
Fundamental unit is any unit that is not dependent on other units and other units can be derived from them
Explanation:
Units such as Kilogram, Mass and Time are said to be fundamental units because they are independent.
Differences between Mass and weight;
1. Mass is the measure of the amount of matter in a body while weight is a measure of how the force of gravity acts upon that mass.
2. Mass is a scalar quantity while weight is a vector quantity
A(n) ____ like rubber or plastic has high electrical resistance.
Answers
Answer:
insulator
Explanation:
A pitcher throws a baseball horizontally from the mound to home plate. The ball falls 0. 857 m (2. 81 ft) by the time it reaches home plate 18. 3 m (60 ft) away. How fast was the pitchers pitch.
Answers
Answer:
Baseball is commonly expressed in English units - we'll use that
(Rubber to home plate is 60' 6 '' but the ball is probably released at about 60 ft)
t = S / v time of fall and time to reach plate
H = 1/2 g t^2
t = (2 H / g)^1/2 we'll use 32.,2 ft / sec^2 for g
t = (2 * 2.81 / 32.2)^1/2 = .418 sec
v = 60 ft / .418 sec = 144 ft/sec
Since 60 mph = 88 ft/sec
v = 144 / 88 * 60 = 98 mph
Select all that apply. PLZ
Which of the following do not illustrate a complete circuit?
D
C
A
B
Answers
do not complete the circuit there is no battery on a and paper dose not conduct electricity
at what angle work done is equal to zero
Answers
Answer:
work done=0 when angel between 2 objects is 90 degree
A voltmeter is connected in _____ with the component whose voltage is to be measured.
Answers
Answer: parallel
Explanation: A voltmeter is connected in parallel with the component whose voltage is to be measured.
a rope holds a baloon, if vertical lift is 1200 n and the tension in rope is 1300 what is the horizontal force of the wind on the balloon??
Answers
Around 500 N is the size of the wind's horizontal force on the balloon.
How can we use the second law of motion to calculate the net force operating on an object?According to Newton's second rule of motion, an object's acceleration is a function of both its mass and the net force acting on it. The formula Fnet F n e t =ma serves as the representation for this law.
cos(θ) = horizontal component of tension / tension in rope
cos(θ) = F_h / 1300
F_h = 1300 cos(θ)
sin(θ) = vertical component of tension / tension in rope
sin(θ) = 1200 / 1300
sin(θ) ≈ 0.923
cos(θ) ≈ 0.385
Plugging this into our equation for F_h, we get:
F_h = 1300 cos(θ) ≈ 500 N
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