Answer:
Properties of an Electric Field
Field lines never intersect each other. They are perpendicular to the surface charge. The field is strong when the lines are close together, and it is weak when the field lines move apart from each other. The number of field lines is directly proportional to the magnitude of the charge.
Explanation:
what is 7/3 because it wont work for me pls help
Answer:
7/3 = 2 1/3
Explanation:
If the numerator is greater than or equal to the denominator of a fraction, then it is called an improper fraction. In that case, you could convert it into a whole number or mixed number fraction. 7/3 = 2 1/3.
Answer:
2.3333 (3-repeating) hope that helps
Calcular la cantidad de solucion que se encuentra en un recipiente con 670 g de solvente y 22 g de soluto
Answer:
692 g
Explanation:
La fórmula para encontrar la solución de una mezcla química es agregar el soluto y el solvente juntos. Esto significa
Solución = solvente + soluto
Solución = 670 g + 22 g
Solución = 692 g
es así de simple, y espero que lo entiendas
You have a 100 ohm resistor. How
much resistance must you add in
parallel to the 100 ohm resistor to
create an equivalent resistance of
75.0 ohms?
Answer:
R2 = 300 Ohms
Explanation:
Let the two resistors be R1 and R2 respectively.
RT is the total equivalent resistance.
Given the following data;
R1 = 100 Ohms
RT = 75 Ohms
To find R2;
Mathematically, the total equivalent resistance of resistors connected in parallel is given by the formula;
[tex] RT = \frac {R1*R2}{R1 + R2} [/tex]
Substituting into the formula, we have;
[tex] 75 = \frac {100*R2}{100 + R2} [/tex]
Cross-multiplying, we have;
75 * (100 + R2) = 100R2
7500 + 75R2 = 100R2
7500 = 100R2 - 75R2
7500 = 25R2
R2 = 7500/25
R2 = 300 Ohms
007 (part 1 of 2) 1.0 points
Light moves from flint glass (n = 1.66) into
water at an angle of incidence of 27.2º.
a) What is the angle of refraction?
Answer in units of".
008 (part 2 of 2) 1.0 points
b) At what angle would the light have to be
incident to give an angle of refraction of 90.0°
Answer in units of
Answer:
a) The angle of refraction is approximately 34.7
b) The angle the light have to be incident to give an angle of refraction of 90° is approximately 53.42°
Explanation:
According to Snell's law, we have;
[tex]\dfrac{n_1}{n_2} = \dfrac{sin (\theta_2)}{sin (\theta_1)}[/tex]
The refractive index of the glass, n₁ = 1.66
The angle of incident of the light as it moves into water, θ₁ = 27.2°
a) The refractive index of water, n₂ = 1.333
Let θ₂ represent the angle of refraction of the light in water
By plugging in the values of the variables in Snell's Law equation gives;
[tex]\dfrac{1.66}{1.333} = \dfrac{sin (\theta_2)}{sin (27.2^{\circ})}[/tex]
[tex]sin (\theta_2) = sin (27.2^{\circ}) \times \dfrac{1.66}{1.333} \approx 0.5692292265[/tex]
θ₂ = arcsin(0.5692292265) ≈ 34.7°
The angle of refraction of the light in water, θ₂ ≈ 34.7°
b) When the angle of refraction, θ₂ = 90°, we have;
[tex]\dfrac{1.66}{1.333} = \dfrac{sin (90^{\circ})}{sin (\theta_1)}[/tex]
[tex]sin (\theta_1) = \dfrac{sin (90^{\circ})}{\left( \dfrac{1.66}{1.333}\right)} = sin (90^{\circ}) \times \dfrac{1.333}{1.66} \approx 0.803[/tex]
θ₁ ≈ arcsin(0.803) ≈ 53.42°
The angle of incident, θ₁, that would give an angle of refraction of 90° is θ₁ ≈ 53.42°
What best describes an impulse acting on an object?
the net force on an object divided by the time of impact
the velocity of an object divided by its mass
the product of an object's mass and the time of force impact
the product of an object's mass and its change in velocity
it
Answer:
D
Explanation:
factorise the following - 6x³ + 3x² + 8x + 4 ?
p(1) = -16 x (1)³ + 3 x (1)² + 8 x 1 + 4
= -16 + 3 + 8 + 4
= -16 +16
=0
Plisssss you can help me pliss
9) An object with a height of 18 cm is placed in front of a converging lens. The image has a
height of –9.0 cm.
a) What is the magnification of the lens?
b) If the focal length of the lens is 6.0 cm, how far in front of the lens is the object?
c) Where does the image appear?
Answer:
Explanation:
a) Magnification = image height / object height = -9 / 18 = -0.5
b) Magnification = - image distance / object distance = -0.5
so image distance = 0.5 object distance
1/focal length = 1/image distance + 1/object distance
1/6 = 1/(0.5 object distance) + 1/object distance
object distance = 18.0 cm
c) Image appears behind the lens.
Answer:
Explanation:
mag = ht i/ht o = -9/18 = -1/2
mag = -1/2 = -di/do
do = 2di
put in eqn
1/f = 1/di + 1/do
1/6 = 1/di + 1/2di
2di = 18
do = 18cm
image is behind lens
Highway safety engineers want to design roadside barriers that will crumple
in the event that a car drives off the road and collides with them, slowing
down the car more gradually. The average person has a mass of 68 kg and
travels on a highway at a velocity of 27 m/s. If the engineers know that the
maximum force that a person can safely withstand is 2180 N, approximately
how much time is required to crumple the barrier to safely slow the person
with this force?
Answer:
[tex]0.84\:\text{s}[/tex]
Explanation:
The impulse-momentum theorem states that the impulse on an object ([tex]F\Delta t[/tex]) is equal to the change in momentum of that object ([tex]\Delta p[/tex]).
Set up the following equation:
[tex]F\Delta t=\Delta p[/tex]
Solving for change in momentum:
The momentum of an object is equal to [tex]p=mv[/tex], where [tex]m[/tex] is the mass of the object and [tex]v[/tex] is the velocity of the object. Since the person's final velocity will be zero, their final momentum will also be zero. Therefore, the person's change in momentum is [tex]68\cdot 27-0=1836\:\text{kgm/s}[/tex].
Solving for time:
[tex]2180\cdot\Delta t = 1836,\\\Delta t =\frac{1836}{2180},\\\Delta t =\boxed{0.84\:\text{s}}[/tex]
Answer:
If the engineers know that the
If the engineers know that themaximum force that a person can safely withstand is 2180 N, approximately, 0.84 second is required to crumple the barrier to safely slow the person
is required to crumple the barrier to safely slow the personwith this force.
helpppppppppppp.......!
Explanation:
m = 66 kg
a = 2 m/s²
F = .....?
F = m . a= 66 . 2
= 132 N
#CMIIWThe distance from Abdullah's house to his school is 2.4km. Abdulla takes 0.6h to go to school on his cycle but takes only 0.4h to return home. His average speed is
Answer:
The average speed can be calculated as the quotient between the distance travelled and the time needed to travel that distance.
To go to the school, he travels 2.4 km in 0.6 hours, then here the average speed is:
s = (2.4km)/(0.6 hours) = 4 km/h
To return to his home, he travels 2.4km again, this time in only 0.4 hours, then here the average speed is:
s' = (2.4 km)/(0.4 hours) = 6 km/h.
Now, if we want the total average speed (of going and returning) we have that the total distance traveled is two times the distance between his home and school, and the total time is 0.6 hours plus 0.4 hours, then the average speed is:
S = (2*2.4 km)/(0.6 hours + 0.4 hours)
S = (4.8km)/(1 h) = 4.8 km/h
A 100 kg bungee jumper leaps from a bridge. The bungee cord has an un-streched equilibrium length of 10 m, and a spring constant of 35 N/m. What is the greatest vertical distance below the bridge surface that the bungee jumper will reach? Enter your answer as a positive number in meters, but do not enter units.
Answer:
11.78meters
Explanation:
Given data
Mass m = 100kg
Length of cord= 10m
Spring constant k= 35N/m
At the greatest vertical distance, the spring potential energy is equal to the gravitational potential energy
That is
Us=Ug
Us= 1/2kx^2
Ug= mgh
1/2kx^2= mgh
0.5*35*10^2= 100*9.81*h
0.5*35*100=981h
1750=981h
h= 1750/981
h= 1.78
Hence the bungee jumper will reach 1.78+10= 11.78meters below the surface of the bridge
Answer:
[tex]X=74.7[/tex]
Explanation:
From the question we are told that:
Mass [tex]m=100kg[/tex]
Length [tex]l=10m[/tex]
Spring constant [tex]\mu=35N/m[/tex]
Generally the equation for potential energy of mass is mathematically given by
[tex]P.E_m=mgh[/tex]
Since
[tex]P.E_m=P.E_s[/tex]
Where
P.E_s =potential energy of spring
Therefore
[tex]m*g*(x+10) = 0.5*k*\mu^2[/tex]
[tex]100*9.8*(x+10) = 0.5*35*\mu^2[/tex]
[tex]980*(x+10) = 17.5*\mu^2[/tex]
[tex]980*x+9800 = 17.5*\mu^2[/tex]
[tex]17.5*\mu^2 - 980*\mu - 9800 = 0[/tex]
Comparing the equation above with standard quadratic equation
[tex]17.5*\mu^2 - 980*\mu - 9800 = 0[/tex]
[tex]ax^2+bx+c=0[/tex]
Giving
[tex]a=17.5\\ b=-980\\ c=-9800[/tex]
Solving Quadratic equation the roots of the equation is given as
[tex]\mu_1=64.66[/tex]
[tex]\mu_2=-8.661[/tex]
Since
[tex]\mu[/tex] can not be -ve
Therefore
The vertical distance attained by the bungee jumper is given as
[tex]X=\mu+l[/tex]
[tex]X=64.7+10[/tex]
[tex]X=74.7[/tex]
If a 20 N force acts on a 10 kg object for 0.5 seconds. If the object starts at rest, what would it’s new p (momentum) and v (velocity) be?
Answer:
[tex]p=10\:\text{kgm/s}},\\v_f=1\:\text{m/s}[/tex]
Explanation:
From Newton's 2nd Law, we have [tex]\Sigma F=ma[/tex]. We can use this to find the acceleration of object after 20 N (force) is applied to the 10 kg object.
Substituting given values, we have:
[tex]\Sigma F=ma, \\20=10a,\\a=\frac{20}{10}=2\:\mathrm{m/s^2}[/tex]
Now that we have acceleration, we can find the final velocity of object (after 0.5 seconds) using the following kinematics equation:
[tex]v_f=v_i+at[/tex], where [tex]v_f[/tex] is final velocity, [tex]v_i[/tex] is initial velocity, [tex]a[/tex] is acceleration, and [tex]t[/tex] is time.
Solving for final velocity:
[tex]v_f=0+2\cdot 0.5,\\v_f=\boxed{1\:\text{m/s}}[/tex]
The momentum of an object is given as [tex]p=mv[/tex]. Since we've found the final velocity and mass stays constant, we have:
[tex]p=10\cdot 1=\boxed{10\:\text{kgm/s}}[/tex]
I really need help with this question
PLEASE ANSWER THIS ASAP THIS IS A SCIENCE QUESTION NO LINKS
Answer:
I believe the answer would be kinetic energy to thermal energy.
Explanation:
Thermal energy is the heat of the brakes, and the kinetic energy would be when the car is in motion before stopping.
The application of a force that causes an object to move in the direction of the force is ______.
Power
Work
Kinetic energy
Distance
Answer:
work is the answer because work is said to be done if an object is displaced by the application of force
Fill in the blank: Friction applies to all states of matter in the gas state it is called ________ resistance and in a liquid it's called ___________ resistance. Air resistance can be used to slow the fall of an object. Parachutes are usually made out of light, strong fabric, originally silk, now most commonly nylon. They are typically dome-shaped, but vary, with rectangles, inverted domes, and others found
Answer:
Drag; water.
Explanation:
Friction can be defined as a force that resists the relative motion of two objects when there surface comes in contact. Thus, it prevents two surface from easily sliding over or slipping across one another. Also, friction usually reduces the efficiency and mechanical advantage of machines but can be reduced through lubrication.
Generally, there are four (4) main types of friction and these includes;
I. Static friction.
II. Rolling friction.
III. Sliding friction.
IV. Fluid friction.
Fluid friction can be defined as a type of friction that acts on physical objects moving through a liquid or gas. A fluid refers to any physical substance that can flow and is able to take the shape of a container.
In science, matter can be defined as anything that has mass and occupies space. Any physical object that is found on earth is typically composed of matter. Matter are known to be made up of atoms and as a result has the property of existing in states.
Basically, matter exists in three (3) distinct or classical phases and these are; solid, liquid and gas.
Generally, friction applies to all states of matter; in the gaseous state, it is called drag resistance and in a liquid it's called water resistance.
Type the correct answer in the box. Spell all words correctly. Complete the sentence using the correct term. A ______enforces federal and state laws related to environmental and natural resources. Reset Next reserved.
Answer:
Environmental Protection Agency (EPA)
Explanation:
In the United States of America, the agency which was established by US Congress and saddled with the responsibility of overseeing all aspects of pollution, environmental clean up, pesticide use, contamination, natural resources and hazardous waste spills is the Environmental Protection Agency (EPA). Also, EPA research solutions, policy development, and enforcement of regulations through the resource Conservation and Recovery Act.
The Environmental Protection Agency (EPA) is the governmental agency set up to ensure that various industries, factories and people comply with laws and regulations concerning the environment i.e it is an agency established to oversee and enforce environmental compliance by the people.
Hence, the Environmental Protection Agency (EPA) is saddled with the responsibility of enforcing federal and state laws related to environmental and natural resources.
what is the refractive index between glass and water?
Answer:
The Refractive index of water is 1.3 and the refractive index of glass is 1.5.
Infrared technology can be used to do which of the following?
A. Locate tumors in the body
B. Monitor human activity at night
C. Photograph through solid objects
O D. Communicate across long distances
Answer:
human activity at night
Explanation:
just did it
could sum1 explain this for 17 points please?
Answer:
If the potential energy change of each cart is the same, then the total mechanical energy change is the same for each cart
Explanation:
Hills look steeper when standing back from the edge so that gaze is nearly parallel to the surface of the hill. When optical slant (the angle between the center of gaze and the surface) is small, surface orientation is pulled toward the direction of gaze
what is her mass pls help
Answer:
B
Explanation:
Atoms in group 18 are inert (chemicalally unreactive) because
Answer:
They have a full shell of valence electrons and are very stable .
Explanation:
Answer
atoms in group 18 are chemically inert because they are stable and do not take part in any chemical reaction.
Explanation:
[tex] \bigstar[/tex] A uniform resistance wire is stretched till it's length becomes four times.What happens to the resistance ?
*Plagiarised / Irrelevant answers will be reported!
Answer:
if a uniform resistance wire is stretched till it's length becomes four times the the resistance of wire multiples by sixteen times as resistance is directly proportional to the
length of wire.
hope it helps.
stay safe healthy and happyAnswer:
we have:
At unit length
Resistance [R]=[tex] \frac{pL}{A} [/tex].....i
where
p: resistivity
L:length
A:area
when
length is strength 4 times
length will be 4L
Now
new equation becomes
Resistance[R] =[tex] \frac{p4L}{A} [/tex]=4[tex] \frac{pL}{A} [/tex]=4R
so
when A uniform resistance wire is stretched till it's length becomes four times. the resistance increases by four times of its original resistance.
what is the answer to bliky got sticky yuh all over mickey
Answer:
huh
Explanation:
Answer:
whaaaaaaaa
Explanation:
Do you think the mass of an object greatly affects the coefficient of friction?
Answer:
no it doesn't
Explanation:
what is wheel and axle?
Answer:
Wheel and axle consists of two coaxial cylinders of different diameters. Various examples of wheel and axle are used in our daily life. Some examples of such wheel and axles are string-roller, screwdriver, MADANI, ROTE PING, spanners, knobs of a door, steering of vehicles etc. Most of them are used for magnifying effort but some are also used to gain speed like MADANI and ROTE PING. In wheel and axles, usually effort is applied on big cylinder called wheel and is overcome bya small cylinder called axle.
Answer:
Explanation: The wheel and axle
a machine consisting of a wheel attached to a smaller axle so that these two parts rotate together in which a force is transferred from one to the other.
What can be the maximum size of a black hole?
Answer:
hello! your answer is fifty billion M
All students except one are cheating on a test. The one student who is not cheating on the test is exhibiting abnormal behavior. Based on the information provided in the article, explain the conclusion of this scenario. Which definition for abnormal behavior would apply to this scenario? (Site 1)
Answer: See explanation
Explanation:
According to clinical psychology, an abnormal behavior is when an act results in a significant distress and is deviant from the normal practice.
In this case, while the whole class is cheating, one student isn't. This shows that the student is deviating from what every other person is doing. Since the student deviates from the norm, it's an abnormal behavior.
Answer:
The reason he might be exhibiting abnormal behavior is the fact that everyone except him is cheating on a test. He is the odd one out and due to this he might be anxious/nervous. Perhaps he thinks that since he is the only one not cheating that he might get a bad grade cause the teacher will assume he is cheating aswell. Another might be that he does not like being singled out. It's out of the norm and he does not particularly like it.
Explanation:
Take this and alter it to your liking. It got me a 100%!
In order to determine the speed of an object, what measurements must be made?
Answer:
You need to have the distance traveled and the time it took to travel that distance.
Explanation: