The skater’s average velocity is determined as 0.125 m/s.
The skater's average speed is determined as 0.25 m/s.
What is average velocity?
The average velocity of an object is the rate of change of total displacement with time of motion.
average velocity = total displacement / total time of motion
total displacement of the skater = final position - initial position
total displacement of the skater = 60 m - 0 m = 60 m
total time of motion = (8 mins) x (60 s / mins) = 480 seconds
average velocity = 60 m / 480 s
average velocity = 0.125 m/s²
What is average speed?The average speed of an object is the ratio of total distance to total time of motion.
average speed = total distance / total time
average speed = (60 m + 30 m + 30 m) / 480 s
average speed = 0.25 m/s
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Question for everybody... Do you like billie eilish or do u hate her and give a explanation why you hate or like her?
Answer:
I like Billie Eilish
Explanation:
My friend introduced me to yer music and really liked stuff like the 30th and Happier than ever. Me and my friend bond over her music and my friend has her own records that we listen too. Billie sticks up for herself and hasnt had to many big controversal moments and she bring modernism to the music indrustry. We have seen many sides of her and she supports others and seems to be a good be a good human being.
Answer:
Yes I like Billie sm
Explanation:
I've heard her music in so many places for years, and she is on my playlist. She is very amazing! I love Happier than Ever, lovely, and Ocean Eyes, they are my fav!
You push a box down the hallway. The box, with a mass of 30kg, accelerates at a speed of 3m/s2. If the force of friction on the box is 20N, how much did YOU exert in order to move it?
The force you exerted in order to move the box, given the data from the question is 110 N
How to determine the net forceWe'll beging by obtaining the net force on the box. This is illustrated below:
Mass (m) = 30 KgAcceleration (a) = 3 m/s²Net force (Fn) =?Net force = mass × acceleration
Net force = 30 × 3
Net force = 90 N
How to determine the force exertedFinally, shall obtain the force exerted to the box. This can be obtained as follow:
Net force = 90 NFrictional force = 20 NForce exerted =?Net force = force exerted - frictional force
90 = force exerted - 20
Collect like terms
Force exerted = 90 + 20
Force exerted = 110 N
This, the force exerted on the box is 110 N
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You drive in a straight line at 18.0 m/s for 10.0 mi, then at 30.0 m/s for another 10.0 mi.
You drive in a straight line at 18.0 m/s speed for 10.0 miles, then at 30.0 m/s for another 10.0 miles, then the average speed is calculated as less than 24 m/s. So, the correct option is C.
What is the speed on average?The overall calculated distance that the object covers in a given amount of time is its average speed. A scalar value represents the average speed. It has no direction and is indicated by the magnitude.
What is a typical speed and an illustration?The entire distance travelled is divided by the time interval to determine average speed.
For instance, someone travelling at an average speed of 40 miles divided by 40 minutes, or 1 mile per minute, is travelling 20 miles north and then 20 miles south (60 mph). Calculating average speed involves dividing the total distance travelled by total time taken.
Here [tex]X_{1}[/tex] = [tex]X_{2}[/tex]
= 10 miles
= 16093.4 m
[tex]t_{1}[/tex] = [tex]X_{1}[/tex]/[tex]V_{1}[/tex]
= 16093.4/18
[tex]t_{1}[/tex]= 894.08s
and then [tex]t_{2}[/tex] = 16093.4/30
[tex]t_{2}[/tex] = 536.45s
Average speed [tex]V_{avg}[/tex] = [tex]\frac{X_{1} + X_{2}}{t_{1} + t_{2} }[/tex]
= [tex]\frac{(16093.4 + 16093.4)}{(894.08 + 536.45)}[/tex]
[tex]V_{avg}[/tex] = 22.50 m/s
Thus, the correct option is that average speed is less than 24 m/s.
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Complete Question
You drive in a straight line at 18.0 m/s for 10.0 miles, then at 30.0 m/s for another 10.0 miles.
Is your average speed
a) 24.0 m/s
b) more than 24.0 m/s
c) less than 24.0 m/s
What is the first step to composing a short piece?
A. Choosing an image as stimuli
B. Choosing your lyrics
C. Choosing a rhythm and a melody
A centrifuge in a medical laboratory rotates at an angular speed of 3,450 rev/min. When switched off, it rotates through 48.0 revolutions before coming to rest. Find the constant angular acceleration (in rad/s2) of the centrifuge.
Answer:
Explanation:no
Which of the following best describes the difference between experiments and correlational research methods? Which of the following best describes the difference between experiments and correlational research methods? Experiments use one type of statistical test; correlational methods use a different type of statistical test Experiments allow researchers to make claims about one thing causing the other; correlational methods don't Experiments are always the best form of research to do; correlational methods are inherently worse
(A) Experiments use one type of statistical test; correlational methods use a different type of statistical test
Correlational research:
A non-experimental research method known as correlational analysis measures two variables and evaluates the statistical relationship (also known as the correlation) between them with little to no effort to control unrelated variables. There are a variety of factors to consider when deciding whether to perform an experiment or a correlational study by researchers interested in statistical correlations between variables. First off, they either don't think the statistical relationship is causative or aren't interested in causality. Remember that the two main objectives of science are to describe and predict; the correlational research approach enables researchers to accomplish both of these objectives.Experimental research:
Experimental research is a term used to describe a study that closely resembles a scientific research methodology. A hypothesis, a controlled variable, and variables that can be measured, computed, and compared make up this structure.The utilization of controlled conditions in experimental research is vital. The facts that the researcher gathers will either confirm or disprove the theory.Difference between experimental and correlational methods:
You alter an independent variable and track its impact on a dependent variable in an experimental design. Other factors cannot affect the outcomes because they are under control. You measure variables in a correlational design without changing any of them.
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John is traveling north at 20 meters/second and his friend Betty is traveling south at 20 meters/second. If north is the positive direction, what are John and Betty's speeds?
A.
-20 meters/second, 20 meters/second
B.
20 meters/second, -20 meters/second
C.
-20 meters/second, -20 meters/second
D.
0 meters/second, 40 meters/second
Answer:
B. 20 meters/ second, -20 meters/ second
By January, the 1.2 kg of water in the birdbath in Robyn’s backyard has frozen to a temperature of -7.6°C. As the season changes, how much heat must be added to the water to make it a comfortable 26.9°C for the birds? Q=mcΔT and Q=mhf
(Heat of fusion for water is 335,000 J/kg) Round to the tenth place.
The heat that is added is 2277 kJ.
What is the heat to be added?We know that heat is a form of energy that appears as a result of temperature difference that exist between two bodies. In this case now, we are told that by January, the 1.2 kg of water in the birdbath in Robyn’s backyard has frozen to a temperature of -7.6°C.
Now there are three transitions that took place here;
The ice was heated to raise its temperature from -7.6°C to zero degreesThe ice melted at zero degreesThe heat required to raise the temperature from zero degrees to 26.9°CThus;
H = mcicedT + mhf + mcwaterdT
H = (1.2 * 2060 * 7.6) + (1.2 * 335,000) + (1.2 * 4182 * 26)
H = 1745kJ + 402 kJ + 130 kJ
H = 2277 kJ
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A record of travel along a straight path is as follows:
1. Start from rest with constant acceleration of 2.25 m/s2 for 19.0 s.
2. Maintain a constant velocity for the next 2.50 min.
3. Apply a constant negative acceleration of −9.09 m/s2 for 4.70 s.
(a) What was the total displacement for the trip? m
(b) What were the average speeds for legs 1, 2, and 3 of the trip, as well as for the complete trip?
leg 1 m/s
leg 2 m/s
leg 3 m/s
complete trip m/s
The total displacement is 4317.34 meters and the average speeds of the legs are 27.36m, 54.72m, 27.35m.
What is average speed?The overall distance the object covers in a given amount of time is its average speed. A scalar value represents the average speed. It has no direction and is indicated by the magnitude.
a = 2.25 m/s2 ; t1 = 19 s ; t = 2.50 min = 150 sec ; a' = -9.09 m/s2 t3 = 4.70 s
(a)The velocity at the end of the first interval will be given by
V = u + at = 0 + a t1 = 2.25 x 19 = 42.75 m/s
This velocity will remain the same throughout the second period in accordance with point (2) and serve as the initial velocity for the third interval.
We now see that, if s is the displacement, s = u t + 1/2 a t2
In our situation, the sum of the displacements in the specified three intervals will represent the total displacement.
[tex]\Delta s(total) = \Deltas1 + \Deltas2 + \Deltas3[/tex]
[tex]\Delta s(total) = [0 + 1/2 x 2.88 x (19)2) + [54.72 x 66 + 0] + ( 54.72 x 6.8 + 1/2 x (-8.05) x (6.8)2][/tex]
[tex]\Delta s(total) = 519.84 + 3611.52 + 185.98 = 4317.34 meters[/tex]
Hence,
[tex]\Delta s(total) = 4317.34 meters = 4.32 Km.[/tex]
(b)Speed for leg 1 will be
v1 = [tex]\Delta s1 / t1 = 519.84 / 19 = 27.36 m/s[/tex]
Speed for leg 2 will be
[tex]v2 = \Delta s2 / t2 = 3611.52 / 66 = 54.72 m/s[/tex]
Speed for leg 3 will be
[tex]v2 = \Delta s3 / t3 = 3611.52 / 66 = 185.98 / 6.8 = 27.35 m/s[/tex]
The average velocity of the complete trip will be given as follows:
V = [tex]\Delta s(total) / t(total)[/tex]
t(total) = t1 + t2 + t3 = 19 + 66 + 6.8 = 91.8 s
[tex]V = \Delta s(total) / t(total) = 4317.34 meters / 91.8 = 47.03 m/s[/tex]
Hence, V = 47.03 m/s
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What is the magnetic force on a 240 mm length of wire stretched between two towers carrying a 150 A current given that the earth’s magnetic field is
5X10^5T
and makes an angle of
60o
with the wire?
The magnitude of magnetic force is 1.55 mN
We know that,
F = I B L Sin θ
where,
F = Magnetic force
I = Current
B = Magnetic field
L = Length
θ = Angle
Given that,
L = 240 mm = 0.24 m
I = 150 A
B = 5 * [tex]10^{-5}[/tex] T
θ = 60°
F = 150 * 5 * [tex]10^{-5}[/tex] * 0.24 * sin 60°
F = 1.55 mN
Magnetic force is the attractive or repulsive force created when electrically charged particles are moved. So, it is the consequence of an electromagnetic force which is one of the four fundamental forces of nature.
Therefore, the magnitude of magnetic force is 1.55 mN
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what's the momentum of a 99 kg Boulder going 30 m/s?
Answer:
2970kgm/s
Explanation:
p=m.v
=99kg.30m/s
=2970kgm/s
Block 1, of mass m1, is connected over an ideal (massless and frictionless) pulley to block 2, of mass m2, as shown. Assume that the blocks accelerate as shown with an acceleration of magnitude a and that the coefficient of kinetic friction between block 2 and the plane is μ.
Find the ratio of the masses m1/m2 .
Express your answer in terms of some or all of the variables a , μ , and θ , as well as the magnitude of the free-fall acceleration g .
The ratio of the masses will be: (a + gsin(θ) + μgcos(θ)) / (g – a)
What is friction?Friction can be defined as the force resisting the relative motion of solid surfaces, fluid layers, and material elements sliding against each other
To solve the above problem, we must find the tension with respect to both masses, and then equate since the tension is the same throughout the entire rope:
For mass 1:
(m1)g – T = (m1)a
substituting where
T = (m1)g – (m1)a
T = (m1)(g – a)
For mass 2:
T – (m2)gsin(θ) – (m2)μgcos(θ) = (m2)a
T = (m2)a + (m2)gsin(θ) + (m2)μgcos(θ)
T = (m2)(a + gsin(θ) + μgcos(θ) )
we will then equate both equations having m1 and m2 were factored in the above equations. we do this in order to isolate m1/m2
(m1)(g – a) = (m2)(a + gsin(θ) + μgcos(θ))
m1/m2 = (a + gsin(θ) + μgcos(θ)) / (g – a)
The ratio of the masses is:
(a + gsin(θ) + μgcos(θ)) / (g – a)
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A car passes you going at 15 m/s and accelerating at 0.2 m/s2. Another person farther along on the road observes it traveling at 30m/s. How far are you from the other person?
The distance between myself and the other person is 1687.5 m
What is distance?Distance is the length between two points. The S.I unit of distance is meter(m)
To calculate the distance between me and the other person, we use the formula below.
Formula:
v² = u²+2ad........ Equation 1Where:
v = Final speedu = Initial speeda = Accelerationd = distance between me and the other personFrom the question,
v = 30 m/su = 15 m/sa = 0.2 m/s²Substitute these values into equation 1
30² = 15²+2×0.2×d900 = 225+0.4d0.4d = 900-2250.4d = 675d = 1687.5 mHence, the distance between myself and the other person is 1687.5 m.
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Describe the mechanism that orchids use to control their pollen distribution.
The pollination methods used by orchid plants to control their pollen distribution include:
Use of nectar rewards use of deceptionUse of trapsWhat is pollination?Pollination is the process by which pollen grains are transferred from the anther to the stigma of the flowers of the same plant or another plant.
When pollination occurs in the same flower of the same plant, it is know as self-pollination.
When pollination occurs in the different flowers of the same or different plants, it is know as cross-pollination.
Considering the orchid plants, the methods which they employ to control their pollen distribution is as follows:
Use of nectar rewards -some orchids attract their pollinators with reward of nectaruse of deception: some orchid species attract their pollinators by means looking like their mating partners making them to think they are mating partnersUse of traps - some orchids use traps to get their pollinators to pollinate them.Learn more about pollination at: https://brainly.com/question/23540386
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define physical fitness in your own definition
"One's capacity to carry out daily activities with maximum efficiency, strength, and endurance while managing the illness, exhaustion, and stress and engaging in less sedentary behavior."
The health of the heart, lungs, and muscles is a component of physical fitness. Fitness also somewhat affects traits like mental acuity and emotional stability because what we do with our body also affects what we can do with our minds.
Hence Being physically fit doesn't need include dominating a particular sport or having bulging muscles.
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Which one of the following is NOT consistent with a car which is accelerating?
Question 13 options:
A car is moving with a high speed.
A car is moving with a decreasing speed.
A car is changing direction.
A car is moving with an increasing speed.
A car moving at a decreasing speed is not consistent with a car that is accelerating. Hence, option B is correct.
What is Acceleration?Acceleration is the general term for any process where the velocity changes. There are just two methods for speeding up : changing your speed or changing your direction, or changing both. This is because velocity is both a speed and a direction.
Its SI unit is m/s² and the dimension is LT⁻² where,
L= length and,
T= Time
Acceleration, a= Velocity/Time
Hence, the car is moving with a decreasing speed will not consistent with a car which is accelerating.
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A brass plate has a 4.00 inch diameter hole in it. A rod with a diameter of 4.01 inches is to be
threaded through this plate to produce an interference fit. This is to be done by increasing the temperature of the plate, passing the rod through the plate, and then allowing the plate to return to its normal temperature. What must be the temperature change of the plate? (The coefficient of expansion per degree centigrade for brass is “19x10^-6 or 0.000019”)
The change in the temperature of the plate is 160 degree centigrade
What is the superficial expansion?We know that the superficial expansion has to do with the increase in the rea per kelvin rise in the temperature of the plate. The first thing that we must do now is to obtain the area of the plate before and after.
Initial area of the plate in square meters = πd^2/4 = 3.14 * (0.1016)^2/4 = 8.10 * 10^-3 m^2
Final area of plate in square meters = πd^2/4 = 3.14 * (0.1019)^2/4
= 8.15 * 10^-3 m^2
2α = ΔA/A1θ
α = linear expansion
ΔA = change in area
A1 = initial area
θ = temperature change
2(1.9 * 10^-5) = 5 * 10^-5/8.10 * 10^-3θ
2(1.9 * 10^-5) * 8.10 * 10^-3θ = 5 * 10^-5
θ = 5 * 10^-5/2(1.9 * 10^-5) * 8.10 * 10^-3
θ = 5 * 10^-5 /3.1 * 10^-7
θ = 1.6 * 10^2 or 160 degree centigrade
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Which variable represents displacement?
Question 5 options:
t
a
v
d
The variable that represents displacement is "d" (option D).
What is displacement?Displacement in physics is a vector quantity which denotes distance with a directional component.
Displacement, unlike distance is a vector quantity i.e. it has magnitude and direction.
Displacement is the measure of “how far out of place is an object. The distance of a body can be denoted by "d".
The displacement of a body can be calculated as follows:
∆d = x¹ - x²
Where;
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What is the scientific name of the cup-shaped pouches of lung tissue that are one-cell thick, and they are the site of gas exchange?
A. Bronchioles
B. Trachea
C. Alveoli
D. Glottis
E. Pharynx
OF. Larynx
G. Nose
Answer:
your answer is C
Explanation:
Alveoli is your answer
What is the force in this
Answer:
It something big enough for this
might be balance force, because the stacks of sticks remains stationary/ stable
definition of balance force = it is when resultant force acting on an obeject is zero and its said to be equilibrium. by newton's first law, the object remains stationary or continues moving at a constant velocity,
bye, hope u understand
What system includes the system that starts the vehicle?
Explanation:
The electrical system provides the voltage necessary to operate the many electrical components on the vehicle such as the vehicle's lighting system. The main source of power for the electrical system is the battery. The electrical system also includes the starting system and the charging system.
A box with mass m = 10
kg is pushed up a
slope to a height of h =
10 m. The slope makes
a 8 = 30° angle with
the horizontal and the
friction force along the
slope is f = 5 N. What
is the input work done
on the box?
Answer:
20m
Explanation:
u=20ms−1
v=0
f=μmgcosθ
mgsinθ+f=ma
mgsinθ+μmgcosθ=ma
530+0.5×10×54=a
6+4=a
a=10ms−2
v2−u2=2as
0−202=2×(−10)×s
s=20m
0.030 km
2. The Olympic record for the marathon is 2hr, 1min, 39s. Determine the average velocity in m/s and
miles per hour of the record.
0.0041m/s and 0.00917 mile/hr. is the average velocity.
If an object moves with an average speed of v for time t, then the distance traveled by this object is s= v.t
Average speed and time are given in the task. So you can use this formula to calculate the marathon distance.
Velocity or speed is defined as: The rate of change of the object's position in any direction. Velocity is measured as the ratio of distance traveled and time traveled. Velocity is a scalar quantity because it has only direction and not magnitude.
time =2hr, 1min, 39s s= 0.030km
t= 7299s s=30m
v=s/t=30/7299
=0.0041m/s.
in mile per hour = 0.00917 mile/hr
So feom the above equations solved the answer is 0.0041m/s and 0.00917 mile/hr.
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Science 6a unit 2 test study guide
Please help me out!!! This is a major grade been taking care of my baby brother while mom works barely had time to study!
Answer:
at number 8 the answer is Uranus
Velocity/Acceleration
a car driving down the highway goes from the 12 mile marker and sometimes later passes the 158 mile mark. how many miles has the car driven
The distance travelled by the car is 146 miles.
What is distance?Distance is a measure the space between two points.
Distance is measured in units of length such as kilometer, meters, miles, feet, etc.
In order to measure the distance between two points, a measuring instrument such as a ruler is used.
Considering the car that was travelling along the road, the distance traveled by the car is calculated as follows;
The car starts moving from an initial highway marker of 12 miles.
The car then travels from the initial highway marker of 12 miles to a second highway marker of 158 miles.
The distance travelled by the car is obtained by finding the differences between the highway markers.
Difference between the highway markers = 158 miles - 12 miles
Difference between the highway markers = 146 miles.
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 which of the following questions may be difficult to test scientifically?
What is the average flight speed of an African swallow?
how was Hawaii formed?
why is cheating wrong?
is there evidence of water on other planets?
When conducting a scientific experiment, it will be difficult to test why cheating is wrong. Thus, (c) is the correct answer.
Scientific experiment is an experiment or study conducted by researchers to verify the authenticity of a test or hypothesis scientifically or assess the possibility or effectiveness of something that has not been attempted before. Scientific experiments show what happens when a certain component is modified, which sheds light on cause-and-effect relationships.
Controlled, field and natural experiments are three essential types of scientific experiments.
Keeping in mind that a successful scientific experiment typically evaluates one independent variable at a time, it is crucial to utilize a control group and to hold all other possible variables constant.
Therefore, it is difficult to test scientifically why cheating is wrong.
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Answer: why is cheating wrong?
Explanation: may be difficult to test scientifically is why is cheating wrong
How do microwaves differ from radio waves?
OA. Microwaves have a lower frequency.
OB. Radio waves have a shorter wavelength.
C. Microwaves have more energy.
OD. Microwaves are not used in communications.
Microwaves differ from radio waves as they have higher frequencies than radio waves.
A recurring event's frequency is measured by how many times it occurs in a unit of time. To emphasize differences between spatial and angular frequencies, it is also sometimes referred to as ordinary frequency or temporal frequency respectively.
Microwaves propagate in a single direction at a time because they are directional. Radio waves have multiple directions in which they can travel from their source. The acceleration of electrons produced in the radio antenna produces radio waves. Microwaves are a subclass of radiowaves.
A microwave is an electromagnetic wave with a low frequency and relatively long wavelength. Despite having greater frequencies than conventional radio waves, microwaves are frequently categorized as radio waves. They have more energy and higher frequencies.
The correct option is B.
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The following graph illustrates how jamil moves as he goes to the paper shop
The graph is the visual representation of information. It shows the information in graphical form.
What is a graph?The graph shows a visual representation of information.
(a) It will take 360 seconds to travel to the shop.
(b) Jamil covers 400 + 90 + 120 km= 610 km distance.
(c) Speed= distance/ time = 610 km/ 360 = 1.69 m/ second.
(d) He spends 360 seconds at the shop.
(e) Speed = d1/t1 + d2/ t2 + d3/ t3= 450/ 150 + 450 / 90 + 450 / 120
= 3 + 5+ 3.75 = 11.75 m / second.
The graph is the visual representation of information. It shows the information in graphical form.
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A speedboat with a mass of 531 kg (including the driver) is tethered to a fixed buoy by a strong 30.3 m cable. The boat's owner loves high speed, but does not really want to go anywhere. So the owner revs up the boat's engine, makes a lot of noise, and runs the boat in circles around the buoy with the cable supplying all the necessary centripetal force. When the tension of the cable is steady at 12900 N, with what force is the boat's engine pushing the boat? Different physics textbooks treat drag force somewhat differently and use different formulas. For the present purpose, take the water's drag force on the boat to be (450 kg/m)×2, where denotes the boat's speed. Ignore any drag force on the cable.
As the tension in the rope is constant therefore the boat engine will also be pushing the boat with the same force as that of the drag force that is given to be 450 Newton.
What is a drag force?Drag force is similar to friction force but is experienced by a moving body in a fluid. Direction of drag force is a positive to the direction of motion.
What is centripetal force?Centripetal force is not a new force in nature but a manifestation of some force that causes rotation of a body.
Given:
Mass of the boat = 531 kg
Tension in the cable = 12900 Newton
Drag force experienced by the boat = 450 N
The boat along with the man is rotating using a cable which experiences a constant tension of 12900 Newton.
The boat's engine should also be generating a force perpendicular to the circular path travelled by the boat.
Now the tension in the string is constant this implies that all the force that the both engine is generating is being used in balancing the drag force exerted by water on the boat.
Therefore, the force produced by the engine will be equal to 450 Newton which will be used to balance the drag force.
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A certain brand of light bulb converts 45% of the available electrical current into light. What is the efficiency of the bulb?
The efficiency of the bulb is the 45%, because it is the useful energy or output energy of the light bulb.
What is efficiency?The efficiency of a device is the amount of the energy input to the device that is converted to a useful energy.
So we say that efficiency of a device is how good a device is at converting energy input to useful energy output.
The efficiency of a device or machine is calculated using the following formula;
efficiency = 0utput energy/input energy x 100%
efficiency = useful energy / total energy x 100%
Thus, if a certain brand of light bulb converts 45% of the available electrical current into light. The efficiency of the bulb is the 45%, because it is the useful energy or output energy of the light bulb.
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