Answer:
6 mph
Explanation:
18 divided by 3 equals 6. The person walks 6 miles per hour.
A car accelerates from 15 m/s to 60 m/s in 30 seconds. What is it’s acceleration?
When a car accelerates from 15 m/s to 60 m/s in 30 seconds, the acceleration of the car is 1 meter/second².
What is acceleration?Acceleration is the rate at which speed and direction of velocity vary over time. A point or object going straight ahead is accelerated when it accelerates or decelerates. Even if the speed is constant, motion on a circle accelerates because the direction is always shifting. Both effects contribute to the acceleration for all other motions.
Given parameters:
Initial speed: u = 15 m/s.
Final speed: v = 60 m/s.
Time interval: t = 30 seconds.
Then, according to definition of acceleration,
Acceleration of the car = change in speed/ time interval
= ( final speed - initial speed)/time interval
= ( 60 m/s - 30 m/s)/30 seconds
= 1 meter/second²
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10 POINTS + BRAINLIEST TO FIRST CORRECT ANSWER! :)
How does a foam-filled winter coat help keep a person warm?
It slows down the transfer of thermal energy from outside to inside the coat.
It slows down the transfer of thermal energy from inside to outside the coat.
It speeds up the transfer of thermal energy from outside to inside the coat.
It speeds up the transfer of thermal energy from inside to outside the coat.
Answer:
The 2nd option
Explanation:
It slows down the transfer of thermal energy from inside to outside the coat.
Answer: It slows down the transfer of thermal energy from inside to outside the coat.
Explanation: In other words, it insulates the heat/coldness
Frictional force increases with the increase in the _______________ of the surface.
1 point
Smoothness
Roughness
Softness
None of the above
Answer:
Frictional force increases with the increase in the roughness of the surface.
Explanation:
You will see that the rougher the surface, the greater the wear and tear.
in this experiment, we use a slotted mass set (containing masses 50 g, 100 g, 200 g, 500 g) and a digital scale with a 0.1 g precision. How is the error in the biceps force determined
The error in the biceps force is determined from the ratio of the precision of the mass measurement and actual mass measurement.
Error in measurementThe error obtained in the measurement of the bicep force is determined from the precision measurement of the masses, since the product of mass and acceleration gives the force applied to the biceps.
F = ma = mg
where;
F is force on the bicepsm is mass a is accelerationg is acceleration due to gravityError percent = (precision/measured mass) x 100%
Error percent = (0.1/50) x 100% = 0.2%
Error percent = (0.1/100) x 100% = 0.1%
Error percent = (0.1/200) x 100% = 0.05%
Error percent = (0.1/500) x 100% = 0.02%
Thus, the error in the biceps force is determined from the ratio of the precision of the mass measurement and actual mass measurement.
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how is moment calculated in different conditions?
Answer:
The Moment of a force is a measure of its tendency to cause a body to rotate about a specific point or axis. This is different from the tendency for a body to move, or translate, in the direction of the force. In order for a moment to develop, the force must act upon the body in such a manner that the body would begin to twist. This occurs every time a force is applied so that it does not pass through the centroid of the body. A moment is due to a force not having an equal and opposite force directly along it's line of action.
Imagine two people pushing on a door at the doorknob from opposite sides. If both of them are pushing with an equal force then there is a state of equilibrium. If one of them would suddenly jump back from the door, the push of the other person would no longer have any opposition and the door would swing away. The person who was still pushing on the door created a moment.
Explanation:
hope it helps you
We discussed five indicators of a chemical change. Which was not one of these? Group of answer choices Formation of a precipitate Color Change Formation of a gas Change of temperature Phase change Production of an odor
gimme em points boi i wan't em gasses
1. A box with a mass of 6 kilograms is pushed with a net force of 10N to
the right on a frictionless surface. Calculate the acceleration of the box. *
Answer:
[tex]a=1.67\ m/s^2[/tex]
Explanation:
Given that,
Mass of the box, m = 6 kg
The net force acting on the box, F = 10 N
We need to find the acceleration of the box. We know that the force acting on an object is given by :
F = ma
a is the acceleration of the box,
[tex]a=\dfrac{F}{m}\\\\a=\dfrac{10\ N}{6\ kg}\\\\a=1.67\ m/s^2[/tex]
So, the acceleration of the box is [tex]1.67\ m/s^2[/tex].
When someone throws a ball, the action force is the person pushing on the ball. What is the reaction force? the ball pushing on the person the ball pushing against air the ball being pulled toward the ground the ball being pulled away from the person
Answer:
A
Explanation:
the ball pushing on the person
Two positive .00008 C charges are set 2.0 m apart as shown.
The direction of the electric force on charge 2 is to the
Cannot be determined
Down
Left
Up
Right
The direction of the electrostatic force on the second charge (charge 2) will be away from the first charge (charge 1).
Electrostatic force between the two chargesThe electrostatic force between the two charges is determined with Coulomb's law;
F = kq²/r²
F = (9 x 10⁹ x 0.0008²)/(2)²
F = 1,440 N
Direction of the electrostatic forceSince the two charges are the same (positive), the direction of the electrostatic force on the second charge (charge 2) will be away from the first charge (charge 1).
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Mr. Koskos brought a scooter to DHS so he could zoom around the halls while the building is empty. The scooter can accelerate at a rate of 45 m/s2. If Mr. Koskos started at 13 m/s, how much time did it take for him to shoot up to a final speed of 51 m/s?
Answer:
51m/s - 13m/s= 38m/s
38m/s÷45m/s²= 0/8
Explanation:
First we bring the difference in speeds to religion because this is the formula
Secondary speed - primary speed ÷ time
[tex] \frac{51 - 13} {45} =0.8[/tex]
Because we do not have a definite time, according to the division formula, we accelerate to get the time
a ball rolls down a ramp,starting from rest, after 4 seconds, it’s velocity is 12m/s. what is the acceleration of the ball?
Answer:
acceleration = (change of velocity) / (time)
a = 12/ 4 = 3 m/s2
if a particle performing shm of amplitude 10 cm at what distance from the mean position is the kinetic energy 2 time the potential energy
The equation for kinetic energy of shm system is given by;
KE=0.5mw²(A²-x²)
where m is the mass of the object
w² is the angular frequency
A is the amplitude
and x is the positive
The equation for the potential energy is given by;
PE=0.5mw²x²
Solve KE=2PE and you get ur answer
[tex] \sf{\blue{«} \: \pink{ \large{ \underline{A\orange{N} \red{S} \green{W} \purple{E} \pink{{R}}}}}}[/tex]
Given:
Amplitude [tex]\displaystyle\sf A = 10\,\text{cm} = 0.1\,\text{m}[/tex]
We want to find [tex]\displaystyle\sf x[/tex] such that the kinetic energy [tex]\displaystyle\sf KE[/tex] is twice the potential energy [tex]\displaystyle\sf PE[/tex].
Using the formulas for kinetic energy and potential energy in SHM:
[tex]\displaystyle\sf KE = \dfrac{1}{2}mv^{2}[/tex]
[tex]\displaystyle\sf PE = \dfrac{1}{2}kx^{2}[/tex]
Since we are considering the same particle, the mass [tex]\displaystyle\sf m[/tex] cancels out. Therefore, we can compare the expressions for [tex]\displaystyle\sf KE[/tex] and [tex]\displaystyle\sf PE[/tex]:
[tex]\displaystyle\sf \dfrac{1}{2}kx^{2} = 2\left(\dfrac{1}{2}kA^{2}\right)[/tex]
Simplifying this equation:
[tex]\displaystyle\sf kx^{2} = 2kA^{2}[/tex]
Dividing both sides by [tex]\displaystyle\sf k[/tex]:
[tex]\displaystyle\sf x^{2} = 2A^{2}[/tex]
Taking the square root of both sides:
[tex]\displaystyle\sf x = \sqrt{2}A[/tex]
Substituting the value of [tex]\displaystyle\sf A[/tex]:
[tex]\displaystyle\sf x = \sqrt{2} \times 0.1\,\text{m}[/tex]
Calculating the value:
[tex]\displaystyle\sf x = 0.1414\,\text{m}[/tex]
Converting to centimeters:
[tex]\displaystyle\sf x = 0.1414 \times 100\,\text{cm}[/tex]
[tex]\displaystyle\sf x \approx 14.14\,\text{cm}[/tex]
Therefore, the distance from the mean position at which the kinetic energy is twice the potential energy is approximately [tex]\displaystyle\sf 14.14\,\text{cm}[/tex].
[tex]\huge{\mathfrak{\colorbox{black}{\textcolor{lime}{I\:hope\:this\:helps\:!\:\:}}}}[/tex]
♥️ [tex]\large{\underline{\textcolor{red}{\mathcal{SUMIT\:\:ROY\:\:(:\:\:}}}}[/tex]
How does a charge transfer from one object to another?
Answer:
Three ways electrons can be transferred are conduction, friction, and polarization. In each case, the total charge remains the same. This is the law of conservation of charge. Conduction occurs when there is direct contact between materials that differ in their ability to give up or accept electrons.
Explanation:
Answer:
Charge transfer by Conduction
Charge transfer by conduction using a negatively charged object.
Charge transfer by conduction using a positively charged object.
Charge transfer by induction using a positively charged object.
Explanation:
9
How can you prove that air has weight
Answer:
Air does, in fact, have weight, and here's a simple way you can prove it. You'll need two identical balloons, a string, and a dowel. Attach the uninflated balloons to either end of the dowel. Attach the string to the center of the dowel and then hang it from something.
Explanation:
The marble in the figure to the right has a mass of 3.75 g. When placed in a graduated cylinder, as pictured, the water level changes from 25 mL to 28 mL. What is the density of the marble?
Answer:
The answer is 1.25 g/mLExplanation:
The density of a substance can be found by using the formula
[tex]density = \frac{mass}{volume} \\[/tex]
From the question
mass = 3.75 g
volume = final volume of water - initial volume of water
volume = 28 - 25 = 3 mL
We have
[tex]density = \frac{3.75}{3} \\ [/tex]
We have the final answer as
1.25 g/mLHope this helps you
A charge of 6. 4 × 10–7 C experiences an electric force of 1. 8 × 10–1 N. What is the electric field strength? 1. 1 × 10–7 N/C 3. 6 × 10–6 N/C 8. 2 × 100 N/C 2. 8 × 105 N/C.
The electric field strength is defined as the ratio of electric force and charge. The electric field strength will be 2.8 ×10⁵ N/C.
What is electric field strength?The electric field strength is defined as the ratio of electric force and charge. The field's direction is determined by the direction of the force acting on the positive charge.
A positive charge produces a radially outward electric field, whereas a negative charge produces a radially inward electric field.
The given data in the problem is;
Q is the charge= 6. 4 × 10–7 C
E is the electric force=1. 8 × 10–1 N
The relation between the electrostatic force and the electric field due to a charge is given as:
[tex]\rm F_E=Q E \\\\ \rm E=\frac{F_E}{Q} \\\\ \rm E=\frac{1.8\times 10^{-1}}{6.4\times 10^{-7}} \\\\ \rm E=2. 8 \times 10^5\ N/C.[/tex]
Hence the electric field strength will be 2.8 ×10⁵ N/C.
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A student hypothesizes that the rate of a chemical reaction will increase as the concentration of the reactants increases. To test his hypothesis, the student performs an investigation. Which are the independent and the dependent variables in the investigation?
Answer:
independent variable- concentration of reactants
dependent variable- rate of reaction
Explanation:
A dependent variable is a variable that is placed under test and is measured under the process of a scientific experiment.
An independent variable is a variable that undergoes the change in the experiment performed. This change is done with respect to test the efforts that are observed on the dependent variable.
In the given hypothesis, 'concentration of reactants' is the independent variable and 'rate of reaction' is the dependent variable
A ball is thrown horizontally. What is the ball's acceleration at its highest point
convert 30 C into kelivn and fahrenheit scale
A wave traveling at 280 m/s has a wavelength of 5. 2 meters. The frequency of this wave is CHOOSE ANSWER
Answer:
The frequency of the wave will be 53.85 Hz
Explanation:
to determine our answer, we can use the following formula "Speed = Wavelength x Frequency."
Speed = 280 m/s
wavelength = 5.2 meters
frequency = ?
meaning, 280 m/s=5.2 times x
divide each side by 5.2
x=700/13 or 53 11/13, or x=53.85
2. A motorcycle starts at rest and moves a distance of 350 m. If it has a constant acceleration of 4.55m/s2, what is
its final velocity?
Answer:
Vf = ≈56.436 m/s
Explanation:
We'll need to use the equation:
Vf^2 = Vi^2 + 2aΔx
Plugging in what we know, we get:
Vf^2 = (0)^2 + 2(4.55)(350)
Finally, some algebra:
Vf^2 = 3185
Vf = ≈56.436
What causes competition among organisms?
Answer:
Whats up Bmw,
The organisms is caused when both the organisms or species are harmed, which is limited supply of at least one resource from food or even water used by both can be a factor.
Explanation:
Hope I helped you, and let me know if you need help on anything else :p
Answer:
Limited resources lead to competition between organisms
Explanation:
Competition is a negative interaction that occurs among organisms whenever two or more organisms require the same limited resource. All organisms require resources to grow, reproduce, and survive. However, organisms cannot acquire a resource when other organisms consume or defend that resource.
What do astronomers observe to find clues as to how our solar systems are formed?
Answer:
a. Patterns of motion among large bodies- Sun, planets, large moons rotate in an organized way (co-planar)—nearly circular orbits in the same direction (coplanar and prograde)
b. Two major types of planets- terrestrial vs. jovian planets
c. Asteroids and comets- locations, orbits, and compositions follow distinct patterns—Asteroids are b/t Mars and Jupiter in the asteroid belt. Also located in the Kuiper belt and Oort Cloud
d. Exceptions to the rules- Earth is inner planet with large moon, Uranus is only side tilted axis, etc.
Hope this helps
why does somthing fall faster if it is heavier
why does something fall faster if it is heavier?
➪ First of all I would like to inform you that this statement is not true. The acceleration does not depend on the mass of the object. Heavier things have a greater gravitational force AND heavier things have a lower acceleration. It turns out that these two effects exactly cancel to make falling objects have the same acceleration regardless of mass.
Lets see
According to Newton's second law
[tex]\\ \rm\rightarrowtail F=ma[/tex]
F denotes to forcem denotes to massa denotes to acceleration[tex]\\ \rm\rightarrowtail F\propto m[/tex]
If mass is more force of gravity is more.[tex]\\ \rm\rightarrowtail m\propto \dfrac{1}{a}[/tex]
If mass is more acceleration is less or air resistance is less .So heavier objects fall faster than lighter ones .
I just wanna know if I’m correct and how?
Answer:
i think that you are right becuase when the line goes down it goes back up and passes 10 and goes down and passes 20 and 20 is 2 10's and 10-10 is 0
Explanation:
i think your right
Please help me with this please
I’ll mark you Brainly
Number 3
Explanation:
Since the gravity is pushing down on potatoes and the bag because of weight, the force is balanced. The gravity makes the bag point downward.
Which item has the least thermal energy? (APEX)
Oh. 5 kg cold water
OB. 5 kgice
O C. 5 lg boiling water
O D. 5 lg hot water just below the boiling point
Answer:
5 KG of ice would have the lowest thermal energy
Answer:
its A; 5 kg of ice
Explanation:
yurrrr
describe momentum with examples
Answer:
Momentum is defined as the amount of motion occurring in something that is moving, or the force that drives something forward to keep it moving. An example of momentum is how quickly a car is moving down a hill.
how are electromagnets used in communication{plsssssssssssssssss pu!!! deadline na next week !!!!!}
Radio works by transmitting and receiving electromagnetic waves. The radio signal is an electronic current moving back and forth very quickly. A transmitter radiates this field outward via an antenna; a receiver then picks up the field and translates it to the sounds heard through the radio
Answer:
radio work by transmitting and receiving electro magnetic waves.
A roller coaster travels 18.0 m at an angle of 13.0° above the horizontal. How far does it move horizontally? Answer in units of m.
Answer:
here is an example
try to solve by this
→
x
=
126
∠
10
,
28
∘
m
Explanation:
Drawing the sketch and filling in all the data, we observe that it is a closed triangle where the cosine rule is valid to find the required side for the magnitude of the displacement.
This yields :
x
2
=
85
2
+
45
2
−
2
(
85
)
(
45
)
cos
150
∘
Solving we get
x
=
126
m
Then to find the direction of the displacement, we may use the sine rule or the cosine rule in the same triangle to yield that the angle of displacement from the horizontal is
10
,
28
∘
.