Answer:
8 seconds
Explanation:
From Newton's second law;
Ft = m(v-u)
F = Force applied
t = time taken
v = final velocity
u = initial velocity
20 * t = 32 (9 - 4)
20t = 32 * 5
t = 32 * 5/ 20
t = 8 seconds
6. A car experiences a forward engine force of 2000N. The combined frictional forces acting
on the car are 600 N. If the car is accelerating at 3.0m/s, what is the mass of the car?
Ans: 467 kg
(I need the equation and work of it!!!)
Answer:
i think
Explanation:
2000N-600N
net force=m.a
1400=m.3.0m/s
1400/30m/s=m
from here u divide using your calculator and i hope the answer you get is 467kg
Can y'all help me please?
A wave has a frequency of 1000 Hz. If the wavelength is 0.5 m, how fast is the wave
traveling?
Answer: 1000 Hz · 0,5 m = 500 m/s
Explanation: speed = frequency · wavelength
How is mechanical weathering affected by climate
Explanation:
In general, hot wet climates accelerate chemical weathering while cold dry climates accelerate physical weathering. Although the rate of weathering depends on the type of rock, rocks in tropical climates experience the highest rates of weathering because of the combination of high heat and heavy rainfall.
1 Newton is the force that can give a mass of 1 kg an acceleration of
In which activities is speed helpful? Running track Swimming Riding in a bike race All of the above
Answer:
all of the above
Explanation:
they all require speed to beat
Answer:
All of the above
Explanation:
if your taking any kind of quiz or even review and there's a choice of "all of the above" it's always right because that answer won't be on every question!
the magnetic flux density of a given conductor is 3.6T. Given that the conductor generates 12.9N and has a length of 10cm, calculate the current being carried
Answer:
i = 5.28 A
Explanation:
The magnetic force is given by the expression
F = i l x B
the bold letters indicate vectors, let's write the modulus of that expression, where the direction between the conductor and the magnetic field is 90º, therefore the sine 90 = 1
F = i l B
i = F / l B
let's reduce the length to the SI system
l = 10 cm (1m / 100 cm) = 0.10 m
let's calculate
i = 12.9 / 0.1 3.6
i = 5.28 A
You are crouched at the "start" line. Bang! The race begins and 7 seconds later you end up 60 yards down the track. What was your "acceleration?"
Answer:
a = 7.35 ft / s²
Explanation:
For this exercise we must use the kinematics relations
x = v₀ t + ½ a t²
as the runner leaves the starting line his initial velocity is zero
x = ½ a t²
a = [tex]\frac{2x}{t^2}[/tex]
let's reduce the distance to foot
x = 60 yd (3ft / 1yd) = 180 ft
let's calculate
a = 2 180 / 7²
a = 7.35 ft / s²
Two resistors r1=100 ohm and r2=220 ohm are connected in series across a voltage of 6.4v calculate the resistance of the resistor equivalent to r1 and r2
Answer:
r_eq = 320 Ω
Explanation:
It is asked to find the equivalent resistance of a series circuit formed by two resistors r₁ and r₂
r_eq = r₁ + r₂
r_eq = 100 + 220
r_eq = 320 Ω
with this value we can find the current that circulates through the circuit
V = r_eq i
i = V / r_eq
i = 6.4 / 320
i = 0.02 A
What does it mean for two parameters to be inversely proportional?
that means the parameter over another
Explanation:
that is when you say a parameter is inversely proportional to another it means what ever happens to the first parameter the opposite happens to the other parameter
Can someone please give me this answe
Answer:
B
Explanation:
Generally, longer wavelengths have less energy than shorter wavelengths because the higher the frequency, the shorter the wavelength. Since radio waves have longer wavelengths than visible light, the correct answer should be B.
psychology is the study of which kind of human and animal behavior and mental processes?
A. subjective
B. observable
C. imagined
AWARDING BRAINLIEST
Which is the best example of the transfer of heat through radiation?
the Sun providing heat to a solar panel
water boiling in a pot on a hot stove
a room in a house being warmed by a fireplace
a spoon becoming hot when placed in a cup of coffee
Answer:
The first one.
Explanation:
At least I believe so-
What is the definition of light of one year ?
Answer:
The definition of a light year is the distance a photon will travel in a year in a vaccume, like space.
Okay I help some of you guys so can help me please
Please help/ show work !!! Also don’t answer by putting a link!!
SOMEONE PLS PLS
PLS HELP ME!!
give three examples of the types of materials that would be used when
building houses where their thermal conductivity would need to be
considered.
Answer:
wood ,clay brick ,aluminum, and copper.
Explanation:
Three examples of types of material that would be used when building houses where their thermal conductivity are copper, aluminum, fire brick, and carbon steel.
What is thermal conductivity?Thermal conductivity is the rate at which heat is transferred from one object to another by conduction over a material's unit cross-section area.
Therefore, a substance's thermal conductivity will decrease as the distance between its atoms increases.
This is because a substance's molecules will move more randomly with the greater distance between them, which will lead to less efficient energy transfer. Metals have a much higher heat conductivity than liquids.
Therefore, copper, aluminum, fire brick, and carbon steel are three examples of materials whose heat conductivity would be employed for constructing homes.
To learn more about thermal conductivity, refer to the link:
https://brainly.com/question/7643131
#SPJ2
PLEASE HELP I AM GIVINF 99 POINTS PLEASE
Answer:
B
Explanation:
Answer:
B
Explanation:
If a ball has 300 Joules of potential energy at its highest point, how much kinetic energy will it have at its highest speed?
A; less than 300 Joules
B; more than 300 Joules
C: exactly 300 Joules
D; cannot be determined
If a ball has 300 Joules of potential energy at its highest point, Then the kinetic energy is the same at that point i.e exactly 300 Joules. The correct option is (C).
What are kinetic and potential energy?When a body has a mass of m kg and travels a velocity of v m/s then the kinetic energy is given by,
KE=1/2mv²
And when a body is at a height of h meter from the ground and the mass of the body is m kg, then the potential energy is given by,
PE= mgh
Where g= acceleration due to gravity= 9.81m/s²
At The highest point, the kinetic energy is equal to the potential energy.
i.e at the highest point,
KE=PE
Hence If a ball has potential energy at the highest point is 300J that means the kinetic energy at the point is the same i.e 300J.
To learn more about kinetic energy click:
https://brainly.com/question/26472013
#SPJ3
Bob is hanging a pot of water over his campfire to boil water for instant ramen. Which method(s) of heat transfer produce the hot water?
Question 5 options:
A. radiation
B. conduction
C. radiation & conduction & convection
D. radiation & convection
E. radiation & conduction
F. convection
The answer would be ( F.)
Convection is the main method of heat transfer in fluids such as water and air.
Para pagar la entrada al circo y comprar palomitas: Daniela y María van a cooperar con $65.50 cada una y Francisco y Javier con $69.50 cada uno. ¿Cuánto dinero van a reunir?
Answer:
Reunirán $270.
Explanation:
Para pagar la entrada al circo y comprar palomitas Daniela y María van a cooperar con $65.50 cada una. Entonces para calcular el dinero que van a reunir entre ambas debes sumar lo que aporta cada una:
$65.50 + $65.50= $131
Por otro lado, Francisco y Javier van a cooperar con $69.50 cada uno. De igual manera, para calcular el dinero que van a reunir entre ambos debes sumar lo que aporta cada uno:
$69.50 + $69.50= $139
Para conocer el dinero total recaudado, debes sumar lo que aportan tanto ellas como ellos. Esto es:
$131 + $139= $270
Reunirán $270.
A student draws a distance verses time graph to describe the motion of a model train. What does a
horizontal section of the graph indicate about the motion of the train?
Look at the diagram below. What is the size of the overall force on the boat?
Enter your answer as a number
N
30 N
45 N
Can you guys please help me?
Answer:
20V
Explanation:
V = intensity * resistance
V = 2 * 10 = 20
a car's horn is honking at a constant frequency. as the car is driving away from you the pitch you hear will be ______ what is heard by the driver of the car
A. lower than
B. higher than
C. the same as
D. exactly twice
Answer:
Easy
Explanation:
A; lowe than
Boondocks wallpapers Part 1. . . Part 2 is in a couple minutes
Answer:
Is this considered free points
Explanation:
Acceleration is proportional to mass. T or F
Answer:
T....................
Please use this screenshot in any way you can
What happens when you throw a basketball up toward the hoop? If you are lucky, the ball sinks into the net. You score two points before the ball drops down to the ground. The basketball isn’t heavy. Why doesn’t it stay up in the air when you throw it? Have you ever heard the saying, What goes up must come down? This saying helps explain what happens to the basketball. It is being acted on by an invisible force called gravity. Gravity is the force in the universe that attracts all objects to each other.
Gravity has existed since the beginning of the universe. It holds everything in the universe in place. We know it is always there. It is hard to understand how it works. First, you need to understand that there is gravitational attraction between all objects. There is gravitational attraction between you and Earth, between Earth and the Moon, and between Earth and the Sun. You cant feel the gravitational attraction between you and Earth. However, it is what keeps your feet planted firmly on the ground. Imagine spinning around and around on a merry-go-round. As long as you hold on, you will stay on the merry-go-round. Don’t let go! You will fly off and land on the ground. This analogy helps us visualize the gravitational attraction between Earth and you. Earth is spinning on its axis. Gravity keeps you on Earth rather than flying out into space.
Now think about the gravitational attraction between Earth and the Moon. The same force that keeps you on Earth pulls the Moon and Earth together. This attraction keeps the Moon in orbit around Earth. Also think about the affect of the Moons gravitational force on Earths oceans. The gravitational pull of the Moon makes the ocean tides rise and fall.
There is attraction between you and Earth and between the Moon and Earth. The Sun also has a gravitational pull on Earth. This attraction makes the Earth orbit the Sun. The Suns attraction is very strong. All objects in the solar system orbit around this medium-sized star. What would happen if the Suns gravitational attraction suddenly disappeared? All the planets, including Earth, would fly off into space just like you would if you let go of the merry-go-round.
There is gravitational attraction between all objects. Why is the effect stronger in some cases? For example, Earths gravity has a more powerful effect on you than the Suns gravity. How could this be possible? After all, the Suns gravitational attraction holds all of the objects in the solar system. The force of gravity between two objects actually depends on two things. It depends on the mass of the two objects. It also depends on the distances between them. The greater the mass of the objects, the greater the gravitational force between them. In other words, the bigger an object is, the more gravity it has. Distance also has a large effect. The closer objects are to each other, the stronger their gravitational force of attraction. As they get farther apart, the force between them gets weaker. The Sun is much more massive than Earth, but the distance between you and Earth is less. The gravitational pull of the Sun has little effect on you because the distance is so large.
Gravity is the invisible force that attracts all objects, no matter their size or mass. The Sun has the strongest gravitational force of any object in the solar system. It attracts all astronomical objects into orbit around itself. Without this force, everything would fly off into the universe.
Which of the following summaries expresses the main points of the passage best?
Group of answer choices
I believe gravity is the most important aspect of our universe. Without it we would all be floating off into the universe. There wouldn’t be any orbits; instead, all planetary bodies would simply float around, running into each other when they crossed paths and just wandering forever.
There is a gravitational force between all objects in the universe. Gravitational force is what keeps all components of our solar system in orbit around the Sun, as well as moons in orbit around planets. The force of gravity affects Earth's tides and holds us on Earth's surface. The force of gravity between objects depends on their masses and the distance between them.
Gravity is hard to understand and scientists have little to no understanding of how it works. We know that gravity is out there, but the specifics are often lost on us. Plants, animals, and humans are all able to grow tall due to the pull on Earth from the Sun. Without the Sun we would all just stretch out along Earth's surface.
None of the above
Answer:
What happens when you throw a basketball up
toward the hoop? If you are lucky, the ball sinks
into the net, scoring two points before dropping
back down to the ground. The basketball isn’t
that heavy, so why doesn’t it stay up in the air
when you throw it? Have you ever heard thesaying, “What comes up must come down”?
This saying is a simple explanation for what
causes the basketball to fall back to the ground.
It is being acted on by an invisible force called
gravity, which is the basic force in the universe
that attracts all objects to each other.
1 Gravity has existed since the beginning of the universe. It is hard to understand how or why it
works, but we know it is always there because it holds everything in the universe in place. First,
you need to understand that there is a gravitational attraction between you and Earth, between
Earth and the Moon, and between Earth and the Sun. Even though you can’t feel it, the
gravitational attraction between you and Earth is what keeps your feet planted firmly on the
ground. Imagine spinning around and around on a merry-go-round. As long as you are holding
on, then you stay on the merry-go-round, but if you ever let go, you will fly off and land on the
ground. This is a useful analogy in visualizing the gravitational attraction between Earth and
you. Earth is spinning on its axis and thanks to gravity, you are held to your position on Eart
rather than flying out into space. Explanation: this is what i can do!:)
Answer:
I believe gravity is the most important aspect of our universe. Without it we would all be floating off into the universe. There wouldn’t be any orbits; instead, all planetary bodies would simply float around, running into each other when they crossed paths and just wandering forever.
Explanation:
this is the best match
3. Given a force of 44 N and an acceleration of 4 m/s?, what is the mass?
Answer:
m=F/a
= 44/4
= 11 m
Explanation:
Just use the formula F=ma