an object with a charge 9 c and a mass 0.1 kg accelerates from rest to a speed of 21 m/s. calculate the kinetic energy gained. answer in units of j.
Answers
The kinetic energy having charge 9 c and a mass 0.1 kg gained by the object is 22.05 J.
What will be kinetic energy gained by an object ?An object with a charge 9 c and a mass 0.1 kg accelerates from rest to a speed of 21 m/s.
To calculate the kinetic energy gained, we will use the formula,
K.E = 1/2mv²
Where, K.E = Kinetic energy,
m = Mass of the object,
v = Velocity of the object
Charge on the object = 9 C,
Mass of the object, m = 0.1 kg
and
Velocity of the object, v = 21 m/s
Therefore, Kinetic energy gained,
K.E = 1/2mv²= 1/2 × 0.1 × (21)² J= 22.05 J.
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Related Questions
Technician A says that high-intensity discharge (HID) headlights are brighter and have a blue tint. Technician B says that one defective turn signal bulb can cause the turn signal on the affected side to stop blinking (flashing). Who is right?
a) technician A
b) technician B
c) both technicians A and B
d) neither technician A nor B
Answers
Answer:
The right option is;
d) Both technicians A and B
Explanation:
High-intensity discharge (HID) headlights is an electrical gas-discharge light that gives a very bright light when an arc is formed between the tungsten electrodes that have a transparent or translucent housing
The light is ideal for night driving due to its brightness and appear to have a bluish tint at night although the light produced by HID headlight is actually more similar to Sunlight around noon
A turn signal bulb is a flashing light indicator that shows that a vehicle is about to turn or change lanes
An issue with the wiring, a broken connection at the bulb socket or a burnt bulb can result in a condition of "no turn signal" in which the turn signal stops flashing or blinking. Therefore both technicians A and B are correct.
louise is designing a double-slit interference experiment using light with a wavelength of and a separation between the two slits . the distance between the slits and the screen is . she found, however, that the distance between successive fringes on the screen was too small for her to measure accurately, and she changed the set up so that the increased. all of the following are ways that she could have increased except one. which one is it? group of answer choices she could have decreased while increasing . she could have increased while decreasing . she could have increased while increasing . she could have decreased while increasing
Answers
Louise could have decreased the distance between the slits and the screen while increasing the distance between the two slits to increase the distance between successive fringes.
The setup change would not increase the distance between successive fringes in a double-slit interference experiment:
The distance between successive fringes (Δy) can be determined using the formula:
Δy = (λL) / d,
where λ is the wavelength of the light, L is the distance between the slits and the screen, and d is the separation between the two slits.
Based on this formula, we can evaluate the given group of answer choices:
1. Decrease d while increasing λ: This would increase Δy.
2. Increase L while decreasing λ: This would have an unclear effect on Δy.
3. Increase L while increasing λ: This would increase Δy.
4. Decrease λ while increasing d: This would decrease Δy.
The answer is choice 4: she could not have increased the distance between successive fringes by decreasing the wavelength (λ) while increasing the separation between the slits (d).
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It is considered aerobic dance if you dance 3-4 times a week for at least 45 minutes each time.
Question 2 options:
True
False
Answers
Answer:
yes
Explanation:
yes
So I just did the quiz and I just guessed cause I couldn't find a straight answer but I was right. the answer is
TRUE
~
YES, it was considered aerobic dance if you dance 3-4 times a week for at least 45 minutes each time.
When does it have kinetic energy
Answers
When a golf ball is hit, it travels at 41 meters per second. The mass of a golf ball is 0.045kg. Calculate the kinetic energy of the golf ball.
Answers
Answer:
75.645 J
Explanation:
The kinetic energy is related to the mass and velocity by the formula ...
KE = 1/2mv²
For the given mass of 0.045 kg, and velocity of 41 m/s, the kinetic energy is ...
KE = 1/2(0.045 kg)(41 m/s)² = 75.645 J
__
The unit of energy, joule, is a derived unit equal to 1 kg·m²/s².
a stone is thrown vertically upwards with an initial velocity of 20m/s. find the maximum height it reaxhes and the time taken by it to reach the height.
Answers
Explanation: → S = 20m. Hence, The maximum Height reached by stone is 20m and in 2s
Timed! I would really appreciate some help! thank you!
Andy runs for 30 minutes at a speed of 10km/h. How far did he run? (Hint: remember to convert the minutes to hours before calculating distance.) *
3km
5km
150km
Answers
Answer:
x = 5[km]
Explanation:
We must convert the time from minutes to hours.
\(t=30[min]*\frac{1h}{60min}= 0.5[h]\\\)
We know that speed is defined as the relationship between space and time.
\(v=x/t\)
where:
x = space [m]
t = time = 0.5 [h]
v = velocity [m/s]
Now replacing:
\(x = 10[\frac{km}{h} ]*0.5[h]\\x=5[km]\)
a boy of mass 60 kg and a girl of mass 40 kg are together and at rest on a frozen pond and push each other apart. the girl moves in a negative direction with a speed of 3 m/s. what is her momentum? a. 60 kgm/s b. -100 kgm/s c. -120 kgm/s d. 120 kgm/s
Answers
The momentum of the girl is -120 kgm/s in the direction opposite to the boy.
The momentum of an object is defined as the product of its mass and velocity. Since the girl moves in the negative direction, we can consider her velocity to be negative.
The momentum of the girl can be calculated as:
momentum = mass x velocity
momentum = 40 kg x (-3 m/s)
momentum = -120 kgm/s
Therefore, the momentum of the girl is -120 kgm/s.
Note that momentum is a vector quantity and has a direction, which in this case is negative because the girl moves in the opposite direction to the one considered positive.
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If the incident beam of light in the figure below makes an angle (20 degrees) from the normal. What is the angle between the reflected ray and the mirror in the figure below?
Answers
Answer:
the reflected angle must be 20º
Explanation:
The surface on which the ray of light falls is a mirror, therefore the law of reflection must be fulfilled, which establishes that the incident angle is equal to the reflected angle.
Therefore, if the incident angle is 20º, the reflected angle must be 20º receiving the normal.
In materials such as metals, the outer shell electrons are loosely bound to the nuclei of their atoms and are free to move from one atom to another. These materials are good conductors. Is this true or false?
Answers
In materials such as metals the outer most electrons are loosely bound and therefore their movement is chaotic, this allows for the transportation of energy in form of electricity therefore, this materials are good conductors. The statement is true.
the maximum velocity attained by the mass of a simple harmonic oscillator is 10 cm/s, and the period of oscillation is 2 s. if the mass is released with an initial displacement of 2 cm, find (a) the amplitude, (b) the initial velocity, (c) the maximum acceleration, and (d) the phase angle.
Answers
A: the amplitude is 3.18 cm ; B: the initial velocity is -9.55 cm/s ; C the maximum acceleration is -19.7 cm/s^2; and D: the phase angle is 0.201 rad.
a. The amplitude (A) of a simple harmonic oscillator is related to the maximum displacement from the equilibrium position. Given the maximum velocity (Vmax) and the frequency (f), the amplitude can be found using the formula:
A = (Vmax) / (2πf)
f = 1/T, where T is the period of oscillation
So, f = 1/2 s
A = (10 cm/s) / (2π * (1/2 s)) = 10 / π cm
A = 3.18 cm
b. The initial velocity (V0) of a simple harmonic oscillator can be found using the equation:
V0 = -Aωcos(θ), where ω is the angular frequency and θ is the phase angle
Since the mass was released with an initial displacement of 2 cm, θ can be found using the equation:
θ = arcsin(x0/A), where x0 is the initial displacement
x0 = 2 cm
θ = arcsin(2 cm / 3.18 cm) = 0.201 rad
V0 = -Aωcos(θ) = -(3.18 cm) (2π / 2 s) cos(0.201 rad)
V0 = -9.55 cm/s
c. The maximum acceleration (Amax) of a simple harmonic oscillator can be found using the equation:
Amax = -Aω^2 = -(2πf)^2 A
Amax = -(2π / 2 s)^2 (3.18 cm) = -19.7 cm/s^2
d. The phase angle (θ) of a simple harmonic oscillator can be found using the equation:
θ = arcsin(x0/A) = arcsin(2 cm / 3.18 cm) = 0.201 rad
The phase angle represents the phase difference between the position and velocity of the mass.
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a child pulls a sled by a rope across at a constant speed
of the forces listed identify which act upon the sled
normal
gravity
applied
friction
tension
air resistance
Answers
Answer:
Normal, Gravitational, Applied, Friction, and Tension
Explanation:
Because the sled is on the ground, or rather because it is on the earth, it will have a force of gravity, or its weight, pulling it down.
There is a normal force because the sled is not moving into the ground, so there needs to be a force pushing on the sled from the ground. Additionally, Newton's 3rd law states that for every action there is an equal but opposite reaction, if it's in equilibrium or not moving.
There will be an applied force since the child is pulling the sled and is applying a force to do so.
There will be a friction force that is pulling the sled opposite the direction it is moving, since it is on the ground that is presumably not fricitonless.
There will be a tension force pulling on the sled by the rope. However there is also a tension force pulling on the child's hand by the rope, meaning that these are internal forces and essentially balance out, but they are still there.
There is no air resistance force, or very little of it, since the object is not falling.
A car is sitting still what could cause the car to move
Answers
why it is important to have regular supervision of the weights and measurements in the marked?
Answers
Explanation:The fundamental answer is that without regular supervision of, and definitions of, weights and measures, commerce and exchange would be impossible, and there would be no market whatsoever for anything.
Explanation:
#Shadow
The velocity of a particle movie along the x-axis is v(t) = t^2 - 2t, with t measured in minutes and v(t) measured in feet per minute. To the nearest foot find the total distance traveled by the particle from t = 0 to t = 3 minutes.
Answers
zero
Explanation
we know that when derivantind the position function respecto to time we got the function for velocity, so we can integrate the given function to obtain the function for velocity
hence
Step 1
a) integrate to find the function for distance travelede
\(\begin{gathered} v(t)=t^2-2t \\ integrate \\ \int(t^2-2t)\text{ dt} \\ \int(t^2-2t)\text{ dt=}\frac{t^{2+1}}{2+1}-\frac{2t^{1+1}}{2} \\ \int(t^2-2t)\text{ dt=}\frac{t^3}{3}-t^2 \end{gathered}\)so
\(\begin{gathered} d(t)=\frac{t^3}{3}-t^2+C \\ C=initial\text{ distance , so c=0} \end{gathered}\)Step 2
now,we have the functio for the distance,
a) evaluate for t=0
\(\begin{gathered} d(t)=\frac{t^3}{3}-t^2 \\ d(0)=\frac{t^{3}}{3}-t^2=\frac{0^3}{3}-0^2=0-0=0 \\ d(0)=0 \end{gathered}\)b) evaluate for t=3 minutes
\(\begin{gathered} d(t)=\frac{t^3}{3}-t^2 \\ d(3)=\frac{3^3}{3}-3^2=\frac{27}{3}-9=9-0 \\ d(3)=0 \end{gathered}\)now, find the total distance traveled by the particle from t = 0 to t = 3 minutes., subtract the positions
\(distance=\Delta d=0m-0m=0m\)so, the total displacement would be zero,but :
the particle actually travels ,it start in negative direction,and then it moves to positive direction, after 3 minutes the particle is in the same place
so, the answer is zero
I just got asked a question about quantum entanglement. Can someone please give me a basic understandable of what it is
Answers
a property of a set of subatomic particles whereby a quantum characteristic (such as spin or momentum) of one particle is directly and immediately correlated with the equivalent characteristic of the others regardless of separation in space
In quantum entanglement, subatomic particles maintain a relationship—for instance, vibrating when the other vibrates—even when separated and even if they are at great distances from each other.
Hope it helps you.
Kinetic energy of 110 j and velocity of 70 m/s what is the mass
Answers
Answer:
0.04kg
Explanation:
Explanation in pics:
The formula for kinetic energy is KE = 1/2mv². So now the question asks for the mass, not KE. So we need to rearrange the formula so that we are calculating the mass. So, the formula for mass is m=KE/(1/2v²). Now we just substitute the values into the formula. Then just follow what it shows in the pic
What is work done in physics?
Answers
Answer:
work done is the product of force and distance moved in the direction of a force
Answer:
work is said to be done when an energy or force is used.
Explanation:
when you carry a cement and you take a step, work is done.
How to remember physics derivation easier?
Answers
Answer:
hmm let's see
Explanation:
ok, ill use the second equation of motion, u see its quite simple
recall that
average velocity= u+v/2
now think of that v like a box you can can call it velocity lol obviously its velocity
now remember the first equation of motion which is
v=u+at now this is inside the box, now you have to replace the v with it
then it becomes u+u+at/2
now u notice there are two initial velocity u know what to do with that
now it becomes
2u + at/2 now since the numerator applies to both then you can simplify it like this
2u/2+at/2
all the same the pont im trying to make is that you can use imaginative ways to mater derivation you can also reverse it if you don't unferstand you can drop your number
9. Jack makes some concrete steps. The diagrams show their dimensions in
centimetres.
a) Calculate, in cm³, the volume of concrete
needed.
100
b) There are 1000000cm³ in 1m³. Change
your answer from a) into m³
c) The density of concrete is 2400kg/m³. What will be the mass of the steps?
200
Not to scale
Answers
a) The volume of concrete needed is `12000 cm³
b) The volume of concrete needed is `0.012 m³`.
c)The mass of the steps is `28.8 kg`.
a)Volume of concrete needed can be calculated by multiplying the length, breadth and height of the concrete steps.
Thus the volume of concrete steps
= `40 × 30 × 10`
= `12000 cm³`.
Therefore, the volume of concrete needed is `12000 cm³`.
b) Given, `1m³` is equal to `1000000cm³`.
Thus the volume of concrete steps in `m³` will be
`12000/1000000 = 0.012 m³`.
Therefore, the volume of concrete needed is `0.012 m³`.
c) Density is defined as mass per unit volume.
Thus, the mass of concrete steps can be calculated by multiplying the density of concrete and its volume.
The mass of the steps = `0.012 m³ × 2400 kg/m³ = 28.8 kg`.
Therefore, the mass of the steps is `28.8 kg`.
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Hey can someone please help answer this question?
A child rides near the edge of a merry-go-round that rotates on a frictionless axis. If the child walks
toward the center of the merry-go-round, will the angular momentum change if a) the child is the
system? b) the system is the child-merry-go-round
Wouldn’t the two be the same? Because it is simply speaking about the child’s angular momentum?
Answers
Answer:
yes ............................................ks
Explanation: is good
1. What happens to the orbit of the planet if the mass of the sun changes?
Answers
Answer:
If the sun's mass were to double without pushing or pulling on the Earth, then the Earth's orbit will change to an ellipse which brings it out to our current radius but spends most of its time closer to the sun. The tides would probably get even stronger then, particularly when our orbit takes us closer to the sun.
Explanation:
The warming of a car in the sun is an excellent analogy for the greenhouse effect of our atmosphere. Complete the analogy with the words and phrases then place the sentences in order. Drag the text blocks below into their correct order. visible light с The car windows allow and infrared radiation to pass into the car. Similarly, our atmosphere allows infrared radiation and to pass through. none polar ice caps The car's interior, like the Earth's absorbs and infrared radiation then emits infrared radiation back out.
Answers
The car's interior, like the Earth's, absorbs visible light and infrared radiation, then emits infrared radiation back out.
c. Visible light and infrared rays can enter the car through the windows. Similar to how visible light and infrared radiation can pass through our atmosphere. a. Similar to how a car's exterior reflects some incoming radiation, the polar ice caps do the same. b. Just like the Earth, the interior of the car collects visible light and infrared radiation before reemitting it. d. The automobile gets hotter since none of the radiation can get through the windows. Similar to how part of the radiation that the Earth emits is trapped in the atmosphere, global warming results.
Order correctly: Visible light and infrared radiation can enter the car through the windows.
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5. On a hot summer day the grass feels cooler than the sidewalk, because
O
O
the grass has a higher specific heat
the grass has a smaller surface area
the sidewalk is at a higher temperature
Answers
Answer:
because the side walk is at high temperature
a flat, circular loop has 20 turns (the wire circles around 20 times). the radius of the loop is 16.3 cm and the current through the wire is 0.565 a. determine the magnitude of the magnetic field at the center of the loop.
Answers
the magnitude of the magnetic field at the center of the loop is 1.15 × 10⁻⁴ T.
Given data:
Number of turns (n) = 20Radius of the loop
(r) = 16.3 cm
Current (I) = 0.565 A
Magnetic field at the center of the loop can be calculated by using the formula:
B = μ₀nI/2r
Where,
μ₀ is the permeability of free space.
Magnetic field formula in the case of a flat circular loop can be defined as B = μ₀NI/2R,
where μ₀ is the permeability of free space, N is the number of turns in the loop, I is the current in the loop, and R is the radius of the loop.
Substituting the given values in the formula, we get:
B = (4π×10⁻⁷ N/A²) × (20 turns) × (0.565 A) / (2 × 16.3 cm)
B = 1.15 × 10⁻⁴ T
Therefore, the magnitude of the magnetic field at the center of the loop is 1.15 × 10⁻⁴ T.
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Ceiling-suspended paddle fans must not be located within a zone measured ____ horizontally and ____ vertically from the top of the bathtub rim or top of a shower stall threshold.
Answers
Two light bulbs use 30 W and 60 W, respectively, when connected in parallel to a 120-V source. How much power does each bulb use when connected in series across the 120-V source, assuming that their resistances remain the same?
Answers
The power each bulb uses when connected in series across the 120-V source is 13.33 W and 6.666 W respectively.
The resistance is given by:
P = V² ÷ R
30 = (120²) ÷ R₁
R₁ = 480
P = V² ÷ R
60 = (120²) ÷ R₂
R₂ = 240
when in series
current I = V ÷ R(eq)
I = 120 ÷ (240 + 480)
I = 0.1666 A
In the first bulb power,
P₁ = I² × R₁
P₁ = 13.33 W
In the second bulb power,
P₂ = I₂ × R₂
P₂ = 6.666 W
Therefore, The power each bulb uses when connected in series across the 120-V source is 13.33 W and 6.666 W respectively.
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Hydrogen bonding is a weak attractive force.
O A. True
O B. False
Answers
Answer:
The Answer is gonna be True
Explanation : A hydrogen bond is a weak type of force that forms a special type of dipole-dipole intermolecular attraction when a hydrogen atom is bonded directly to one of the most electronegative elements like nitrogen (N), oxygen (O) or fluorine (F). This causes the hydrogen to acquire a significant amount of positive charge.
Or
Hydrogen bond is an attractive force between a partially positive charged hydrogen and a partially negative charged atom (oxygen and nitrogen). This is a very weak bond and strength of hydrogen bond (5-10 Kcal per bond) is much less than the strength of covalent bond. Hydrogen bonds are usually showed as dotted lines between two atoms.
This is the Answer for your question :3
I hope you are having a great day ❤️❤️❤️❤️❤️
Answer: The attraction of opposite charges between hydrogen and oxygen does not form a weak bond because oxygen-hydrogen makes hydrogen bonding. Hydrogen bonding is a very attraction force
Plz help me. I need urgent Why a magnetic compass is used to determine direction? Why a nail gets magnetized when kept close to magnet? Why two pins get attracted by bar magnet maintain distance between ends?
Answers
Answer:
Compasses are mainly used in navigation to find direction on the earth. This works because the Earth itself has a magnetic field which is similar to that of a bar magnet. The compass needle aligns with the Earth's magnetic field direction and points north-south. Also, In a magnet all the domains are oriented in the same direction. In the case of a nail, the domains can be aligned in the same direction causing the nail to become magnetic. That is because if you hang a bar magnet from a thread, the north pole will point to magnetic north. When you bring one north pole close to another north pole they repel each other. You can feel the two magnets pushing each other apart.
Alcohol is being heated on the stove and distillates at 172.4⁰F . What is this temperature on the Celsius degree?
Answers
Answer: The head temperature rises as the vapors of lower-boiling compound fill the distillation head. The temperature drops because the lower-boiling compound finishes distilling before vapors of the higher-boiling compound can fill the distillation head, which then cause the head temperature to rise.