Answer:
The average acceleration of the cyclist is 5 m/s²
Explanation:
Given;
initial velocity of the cyclist, u = 10 m/s
final velocity of the cyclist, v = 20 m/s
initial time of the cyclist, t₁ = 4 seconds
final time of the cyclist, t₂ = 6 seconds
The average acceleration is given by;
[tex]a = \frac{dv}{dt}\\\\a = \frac{v-u}{t_2-t_1}\\\\a = \frac{20-10}{6-4}\\\\a = 5 \ m/s^2[/tex]
Therefore, the average acceleration of the cyclist is 5 m/s²
A bat, flying toward the east at 2.0 m/s, emits a shriek that is reflected back to it from a wall that is 20.0 m in front of the bat at the instant the shriek is emitted. Sound travels at 340 m/s in the air. How many milliseconds after emitting the shriek does the bat hear the reflected echo from the wall? *
Answer:
t = S / V where S is distance sound travels and V the speed of sound
S = 20 + 20 - v t where v is speed of bat and t time to hear echo
S = 40 - v t
t = (40 - S) / v = (40 - V t) / v substituting S from 1st equation
v t + V t = 40
t = 40 / (v + V) = 40 / (340 + 2) = .117 sec = 117 ms
HELP!! Why is motion not considered a force?
Answer:
There cannot be a force without motion and if there is no motion, then there is no force acting.
Explanation:
A force is a vector that causes an object with mass to accelerate.
Answer:
because force need motion
Explanation:
* THE ANSWER IS D * Find the location of fluorine (F) on the periodic table. What type of ion will fluorine form?
A. An ion with a +7 charge
B. An ion with a +1 charge
C. An ion with a -7 charge
D. An ion with a -1 charge
Answer:
d
Explanation:
Fluorine will form an ion with a -1 charge.
What is fluorine?Fluorine is a chemical detail with the image F and atomic range 9. it is the lightest halogen and exists under fashionable conditions as an extraordinarily poisonous, pale yellow diatomic gasoline. as the maximum electronegative element, it is extremely reactive, because it reacts with all other factors besides argon, neon, and helium.
What's fluorine used for?Fluorine is essential for the manufacturing of nuclear fabric for nuclear energy plant life and for the insulation of electrical towers. Hydrogen fluoride, a compound of fluorine, is used to etch glass. Fluorine, like Teflon, is used to make plastics and is likewise vital in dental health.
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How can a model be created to predict how forces affect objects at a distance?
Answer:
Gravitational force increases as the masses of the objects increase and decreases as the distance between the objects increases. Balanced forces acting on an object cause no change in the motion of the object. When unbalanced forces act on an object, the sum of the forces is not equal to zero.
Explanation:
put it in your own words
pics pls you know what I mean
boiiii I wont show you nun
A wagon is pulled to the right using a force of 20 N and to the left using a force of
30 N. What is the net force on the wagon?
Answer:
Net force = 10N
Explanation:
Net force refers to the sum total of all the forces acting on an object. Net force is denoted by Fnet. According to Newton's third law of motion, for every action force, there is an equal and opposite reaction force. This means that an object with net force is an unbalanced force.
In this case, a wagon is pulled to the right using a force of 20 N and to the left (opposite direction) using a force of 30 N. This means that the net force will be the difference of the two forces acting on the object i.e
Fnet = Fa - Fb
Fnet = 30N - 20N
Fnet = 10N
Someone please help will mark as brainliest
Answer: What Northcliffe means is that news a=is all advertising and not caring about what they are actually saying is true or false so it can and will offend others so they want to suppress (end) the article.
Explanation:
A car travel for 3hours to a distant city 400km due east , what is its speed and velocity
Answer:
well divide 400 by 3 and you should get how fast you're going aka (speed)
gold has a density of 19300 kg/m3 calculate the mass of 0.02m3 of gold in kilograms
Mass if a substance is the product of its volume and density. The mass of gold of 0.02 m³ with a density of 19300 kg/m³ is 386 kg.
What is density?Density of a substance is the measure of its mass per unit volume. Thus, it says how much denser the object is in a given volume. Density of a substance is dependent on its bond type, temperature and pressure beside the volume and mass.
Volume can be defined as the space occupied by the substance. Larger the volume , less dense the substance is. However as the mass increases volume also increases.
Mass of an object is the product of its volume and density.
Given the volume of gold = 0.02 m³
density = 19300 kg/m³.
mass = volume × density
= 0.02 m³ × 19300 kg/m³
= 386 kg
Therefore, the mass of gold is 386 Kg.
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A standing wave has a frequency of 471 Hz and a wavelength of 1.9. What is the speed of the
wave? (Round to the 2nd number after the decimal)
1
I REALLY NEED HELP !
Answer:
c = 894.90 m/s
Explanation:
Given data:
Frequency of wave = 471 Hz
Wavelength of wave = 1.9 m
Speed of wave = ?
Solution:
Formula:
Speed of wave = frequency × wavelength
c = f×λ
c = 471 Hz × 1.9 m
Hz = s⁻¹
c = 471s⁻¹ × 1.9 m
c = 894.90 m/s
The speed of wave is 894.90 m/s.
Martina travels from her house to her moms office building, From there she walks to school. After school, she walks to the library and then to a friends house before finally ending back at home. Fine Martina's totoal distance traveld
Answer:
2.15miles
Explanation:
The total distance traveled by Martina is the sum of the length of path of her travel. Distance is a scalar which has only magnitude but no directional attribute.
Total distance = Office - school + school - library + library - friend's house + friend's house - house
Now insert the given parameters:
Total distance = 1mile + 0.5mile + 0.25mile + 0.4mile = 2.15miles
Total distance is 2.15miles
4. Una pila recargable de 1.2 V tiene una etiqueta que dice 1 800 mAh a) ¿Cuál es la máxima cantidad de carga que puede acumular? B) ¿Y la máxima cantidad de energía? C) ¿Serán exactas todas las cifras significativas que aparecen en el dato de la etiqueta? Respuesta: a) 6480c b)7.8 x 10^3 j o 7.8 kJ c)no NECESITO EL PROCEDIMIENTO
Answer:
a) La carga eléctrica máxima que puede acumular la pila recargable es 6480 coulombs.
b) La máxima cantidad de energía acumulada por la pila recargable es 7776 kilojoules.
c) No son exactas todas las cifras significativas que aparecen en el dato de la etiqueta.
Explanation:
a) La capacidad de la batería es la corriente constante suministrada por la batería durante su tiempo de servicio. En este caso, puesto que la batería tiene una capacidad de [tex]1800\,mAh[/tex], significa que la batería entrega una corriente de 1.8 amperios durante una hora. La máxima cantidad de carga es estimada por la siguiente expresión:
[tex]q = C\cdot \Delta t[/tex] (1)
Donde:
[tex]C[/tex] - Capacidad de la pila recargable, medida en amperios-hora.
[tex]\Delta t[/tex] - Tiempo de servicio, medido en horas.
[tex]q[/tex] - Carga eléctrica, medida en coulombs.
Si tenemos que [tex]C = 1.8\,A[/tex] y [tex]\Delta t = 3600\,s[/tex], entonces la máxima cantidad de energía que puede acumular es:
[tex]q = (1.8\,A)\cdot (3600\,s)[/tex]
[tex]q = 6480\,C[/tex]
La carga eléctrica máxima que puede acumular la pila recargable es 6480 coulombs.
b) La máxima cantidad de energía suministrada por la batería ([tex]E_{max}[/tex]), medida en joules, es definida por la siguiente expresión:
[tex]E_{max} = q\cdot V[/tex] (1)
[tex]E_{max} = (6480\,C)\cdot (1.2\,V)[/tex]
[tex]E_{max} = 7776\,J[/tex]
La máxima cantidad de energía acumulada por la pila recargable es 7776 kilojoules.
c) Sabemos que las unidades estándar del voltaje y la capacidad son el volt y el amperio-hora, respectivamente. Entonces, si asumimos que las cifras significativas quedan representadas por el número de decimales y que se considera razonable que haya una cifra significativa, entonces tenemos que cada variable es en formato de ingeniería:
[tex]C = 1.8 Ah[/tex] y [tex]V = 1.2\,V[/tex].
Al mutiplicarse cualquiera de estas cantidades por un número con una cifra significativa deja con un producto con dos cifras significativas. Por tanto, se pierde precisión al realizarse operaciones de multiplicación.
No son exactas todas las cifras significativas que aparecen en el dato de la etiqueta.
Show the nuclear equation for the alpha decay of iodine-131
Answer:
the sum of the mass numbers on the reactant side must equal the sum of the ,was numbers on the product side.
Explanation:
This is the answer. I'm not sure
1. A way of life that involves little or no physical activity is called a(n)_______
lifestyle. *
A. lazy
B. active
C. fit
D. sedentary
Answer:
its either A or D
Explanation:
lazy-.
1.Unwilling to do work or make an effort; disinclined to exertion.
2.Causing idleness; relaxed or leisurely.
3.Sluggish; slow-moving.
Sedentary
1.Not moving; relatively still; staying in the vicinity.
2.medicine, of a job, lifestyle, etc. Not moving much; sitting around.
3.obsolete inactive; motionless; sluggish; tranquil
i think it's sedentary
What are the three types of mechanical waves?
A. Water
B. Circular
C.longitudinal
D. Surface
E. Transverse
F. Sound
Answer:
I'm sure its transverse, longitudinal and surface
Explanation:
sorry if I'm wrong
a circle has radius of 10cm what is the area in m square. with explantion
Answer:20
Explanation: its easy
By measuring the potential energy of an object relative to the ground, and the object's mass, you can calculate its speed when it hits the ground. Explain why you can do this.
A.because gravitational potential energy can convert to elastic potential energy
B.because gravitational potential energy can convert to kinetic energy
C.because the gravitational potential energy can convert to sound energy
D.because gravitational potential energy can convert to electric potential energy
Answer:
B.because gravitational potential energy can convert to kinetic energy
Explanation:
You can calculate the speed as it hits the ground because gravitational potential energy can convert to kinetic energy.
In this way, total energy can be conserved.
We can equate the kinetic energy and potential energy. From this we can solve for the velocity. This way, we know that the potential energy is changing to kinetic energy.Answer: B
Explanation:
A cat rolls up a hill. It’s initial Velocity is 10 m/s.n It’s final velocity is 0 m/s. The time was five seconds. Calculate Acceleration
Answer:
[tex]\boxed {\boxed {\sf a= -2 \ m/s^2}}[/tex]
Explanation:
Acceleration can be found by dividing the change in velocity by the time.
[tex]a=\frac{v_f-v_i}{t}[/tex]
The final velocity of the cat was 0 meters per second and the initial velocity was 10 meters per second. The time was 5 seconds.
[tex]v_f=0 \ m/s\\v_i=10 \ m/s\\t= 5 \ s[/tex]
Substitute the values into the formula.
[tex]a=\frac{0 \ m/s-10 \ m/s}{5 \ s}[/tex]
Solve the numerator.
0 m/s-10 m/s= -10 m/s[tex]a=\frac{-10 \ m/s}{5 \ s}[/tex]
Divide.
[tex]a= -2 \ m/s^2[/tex]
The acceleration of the cat was -2 m/s². The negative acceleration indicates slowing down or stopping.
Explain why the roofs are blown off during high speed winds.
Answer:
Roofs are blown down due to the speed and pressure of the winds that will become strong and can destroy anything in its path.
Explanation:
How much work do you do when you push a shopping cart with a force of 20 N for a distance of 5m?
A.100J
B.10J
C.1J
D.1000J
Answer:
A.100J
Explanation:
Given parameters:
Force on car = 20N
Distance = 5m
Unknown:
Work done = ?
Solution:
Work done is the product of force and distance;
Work done = force x distance;
Insert given parameters and solve;
Work done = 20 x 5 = 100J
Which structure is found in some but not all plant cells?
vacuole
ribosome
cell wall
lysosome
HELP PLEASE AND THERES ONLY ONE CORRECT ANSWER!!!!!!!
Answer:
Lysosme
Explanation:
All plant cells have cell walls due to their ability to not protect themseleves unlike us humans or aniamls. Ribosomes and vacuoles also are in all plant cells as provide it with nutrients. Lysosme are not always commonly found in all plant cells because they have cell walls to proctect them. Hope this helps :)
Which is the best description of civilliberties?
Answer:
The state of being subject only to laws established for the good of the community, especially with regard to freedom of action and speech (freedom of conscience, freedom of press, freedom of religion, freedom of expression, freedom of assembly)
A crane uses an average force of 5,200 N to left a girder 25m. How much work does the crane do on the girder?
Answer:
130,000 JExplanation:
The work done by an object can be found by using the formula
workdone = force × distance
From the question we have
workdone = 5200 × 25
We have the final answer as
130,000 JHope this helps you
A car traveling at a speed of 50.0 m/s encounters an emergency and comes to a complete stop. How much time will it take for the car to stop if it decelerates at -4.0 m/s2?
Answer:
t=1.25s
Explanation:
The formula is
a= (V1-V0) /t
t = (V1-V0)/a
V1=50m/s
V0= 0 m/s
a= - 4m/s2
t= (0-50)/-4 = 1.25s
I really need help on this. *my teachers is gruesome-
1. A car starts out at 0 meters per second. It ends up at 100 meters per second . The time is 20 seconds. Calculate acceleration
2.A roadrunner accelerates for 20 meters per second to 60 meters per second in 5 seconds.
3.A lizard running from the roadrunner gets squashed by the car. It was running at 30 meters per second when it got squashed. It’s final velocity is now 0 meters per second because it’s road kill...The time was 10 seconds.
Q1 100 - 0 / 20 = 5
Q2 60 - 20 / 5 = 8
Q3 0- 30 / 10 = -3
yes your teacher is gruesome. poor lizard
Data from a weather satellite was used to generate the image below. The colored regions represent warm portions of the atmosphere.
Which fact about electromagnetic radiation allows scientists to gather such information about the Earth's atmosphere?
A.
Some of the Sun's visible light is scattered as it passes through the Earth's atmosphere.
B.
The warmer a region of the atmosphere is, the more infrared radiation it emits.
C.
Radio waves can pass through buildings and other solid structures.
D.
Ozone in the Earth's upper atmosphere absorbs ultraviolet radiation.
Answer: the answer is b “The warmer a region of the atmosphere is, the more infared radiation it emits”
Explanation:
Answer:
a
Explanation:
i got it right
((Bruv pls hurry on test)) Radioisotopes often emit alpha particles, beta particles, or gamma rays. The distance they travel through matter increases in order from alpha to gamma. Each radioisotope has a characteristic half-life, which is the time needed for half of a sample of radioisotope to undergo nuclear decay.
Which quality is desirable for a radioisotope that is used for medical imaging of a specific organ? Check all that apply.
half-life of several years
half-life of several days
half-life of several seconds
emission of gamma rays
emission of alpha particles
ability to be attached to a compound used by the body
ability to pass through the body without being absorbed
Answer:
2,4,6
Hey I actually saw this answer in the comment section of the incorrect answer to this question and put it up here so people can verify it. Well, hope this helps dude:)
Answer:
2. half-life of several days
4. emission of gamma rays
6. ability to be attached to a compound used by the body
Explanation:
I can confirm this is correct.
Why is gravity so weird?
Answer:
why gravity is so weird?
this is my opinion
Explanation:
One possibility — speculative at this point — is that in addition to the three dimensions of space that we notice every day, there are hidden extra dimensions, perhaps “curled up” in a way that makes them impossible to detect. If these extra dimensions exist — and if gravity is able to “leak” into them — it could explain why gravity seems so weak to us.
Answer:
One possibility — speculative at this point — is that in addition to the three dimensions of space that we notice every day, there are hidden extra dimensions, perhaps “curled up” in a way that makes them impossible to detect. If these extra dimensions exist — and if gravity is able to “leak” into them — it could explain why gravity seems so weak to us.
Explanation:
As the temperature decreases, the atoms lose energy. The atoms begin to move slower. They are held together by attractive forces, but are still able to slide past each other.
solid to liquid
liquid to solid
gas to liquid
gas to solid
gas to liquid is the answer
Answer:
C. gas to liquid
Explanation:
ed. 2021
4. When energy is transformed from one form to another, what kind of energy is
always part of the transformation ? (and is usually not in a useful form)
Biomechanical Energy
O Heat Energy
Nuclear Energy
Answer:
Energy conversion also termed as the energy transformation, is the process of changing one form of energy into another.
The Law of Energy Conversion.
Scenario Energy conversions involved
In steam engine The heat energy to Mechanical Energy
In Electric heater Electric Energy to Heat
During the transformation of energy from one form to another, the kind of energy that is always part of the transformation is: C. Heat energy.
What is energy?
Energy can be defined as the ability (capacity) to do work. Thus, the standard unit of measurement of energy is Joules (J).
The various kind of energy:
Basically, there are different kind of energy and these include:
Biomechanical energyWave energySound energyNuclear energyHeat energyThe Law of Conservation of Energy:
According to the Law of Conservation of Energy, energy can neither be created nor destroyed but it can only be transformed (converted) from one form to another such as potential energy to kinetic energy.
As a general rule, heat energy is always associated with the transformation of energy from one form to another.
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