Answer:
D. Moving the objects closer together
Explanation:
A.P.E.X.
took the quiz
Use the information and picture to answer the following question.
A student creates a poster with two models that show magnified views of the molecular motion in a solid and a liquid.
image
The student forgets to label the models with phases.
Answering which question would BEST help identify which model is in the solid phase?
A.
Which model shows the molecules vibrating in a fixed arrangement?
B.
Which model shows the molecules bouncing around each other?
C.
Which model shows the molecules sliding past each other?
D.
Which model shows the molecules spreading out at different angles?
Answer:
The answer is A
Explanation:
Solids vibrate in a fixed arrangiment, so to find which is a solid look for the one that vibrates in a fixed arrangiment.
According to the forces of attraction, the question which would best identify model is in solid phase is which model shows the molecules vibrating in a fixed arrangement?
What are forces of attraction?Forces of attraction is a force by which atoms in a molecule combine. it is basically an attractive force in nature. It can act between an ion and an atom as well.It varies for different states of matter that is solids, liquids and gases.
The forces of attraction are maximum in solids as the molecules present in solid are tightly held while it is minimum in gases as the molecules are far apart . The forces of attraction in liquids is intermediate of solids and gases.
The physical properties such as melting point, boiling point, density are all dependent on forces of attraction which exists in the substances.
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A cement mixer with a radius of 2 m spins with a tangential velocity of 0.4 m/s. Determine the centripetal acceleration of a piece of dried cement stuck to the inside wall of the mixer.
Answer:
[tex]a=0.08\ m/s^2[/tex]
Explanation:
Given that,
The radius of the mixer, r = 2 m
Tangential velocity of the mixer, v = 0.4 m/s
We need to find the centripetal acceleration of a piece of dried cement stuck to the inside wall of the mixer. The formula for the centripetal acceleration is given by :
[tex]a=\dfrac{v^2}{r}\\\\a=\dfrac{(0.4)^2}{2}\\\\a=0.08\ m/s^2[/tex]
So, the centripetal acceleration is equal to [tex]0.08\ m/s^2[/tex].
The electric field at a point 23 cm from a charged particle is 102424 N/C toward the particle. What is the charge on the particle? (Take k=9x109 Nm2/C2 )
Answer:
2.62×10⁻⁶ C
Explanation:
From the question,
Electric Field (E) = kq/r²....................... Equation 1
Where q = charge on the particle, r = distance of the electric field from the charge, k = coloumb's constant.
make q the subject of the equation
q = Er²/k.............................. Equation 2
Given: E = 102424 N/C, r = 23 cm = 0.23 m, k = 9×10⁹ Nm²/C².
Substitute these values into equation 2
q = (102424×0.23)/(9×10⁹)
q = 2.62×10⁻⁶ C
Hence the charge on the particle is 2.62×10⁻⁶ C
Newton's first law states that objects do not change their velocity unless acted upon
by an outside force. When throwing a ball the ball initially accelerates from the force
provided by your arm and then begins to slow down.
What force(s) are responsible for the deceleration of the ball?
Answer:
Air resistance/Drag (this is the proper term for air resistance) or gravity or friction
It depends on the direction and if you throw it across a surface or if you throw it straight upwards.
I hope this helps!!
Answer:
Newton's first law: An object at rest remains at rest, or if in motion, remains in motion at a constant velocity unless acted on by a net external force.
Explanation:
Electromagnetic waves are transverse waves. Which of the following
would best describe the motion of these waves?
A. The direction of movement is perpendicular to the direction of motion.
B. The direction of movement is parallel to the direction of motion.
C. They only move from place to place through a medium.
D. Their speed depends on the amount of mass contained in each photon.
Answer:
A
Explanation:
transverse waves are waves that travel perpendicular to the direction of the wave motion
whereas, longitudinal waves are waves that travel parallel to the direction of the wave motion.
hope this helps
please mark it
The rhinestones in costume jewelry are glass with index of refraction 1.50. To make them more reflective, they are often coated with a layer of silicon monoxide of index of refraction 2.00. What is the minimum coating thickness needed to ensure that light of wavelength 527 nm and of perpendicular incidence will be reflected from the two surfaces of the coating with fully constructive interference
Answer:
t = 6.6 10⁻⁸ m
Explanation:
In this case we have that the reflection in the film is constructive, we take into account that
* When the light is reflected from the air (n = 1) to the film (n=2) it has a phase change of 180º
* within the film the wavelength is modulated by the index of refact
λₙ = λ₀ / n
taking into account these two aspects the expression for constructive interference is
2n t = (m + ½) λ₀
let's find the minimum thickness (t) of the film
t = (m + ½) λ₀ / 2n
for m = 0
t = ½ 527 10⁻⁹ /(2 2.00)
t = 6.6 10⁻⁸ m
Why do bones weaken as a person gets older
Answer:
The bones aren't as strong as a younger person, because an older person, ages due to time and it also depend on what they do in their past.
Does this help? ^-^"
In a ride in an amusement park, a carriage of mass 450 kg is travelling horizontally at a speed of 18 m/s. It passes through a shallow tank containing stationary water. The tank is of length 9.3 m. The carriage leaves the tank at a speed of 13 m/s. PT 3 a.) Calculate the change in kinetic energy of the cart while it passes through the water tank J (Hint: Change
Answer:
98.
Explanation:
divide
The change in the kinetic energy of the cart is equal to 34875 J.
What is kinetic energy?The energy which is possessed by a moving body because of its motion is known as kinetic energy. Work should be done in order to bring the change in the kinetic energy of a moving object.
The kinetic energy of a moving object can be determined from the formula mentioned below:
K.E. = ½mv² where ‘m’ and 'v' is the mass and velocity of the object.
Given, the mass of the carriage, m = 450 Kg
The speed of the carriage, u = 18 m/s
The initial kinetic energy of the cart = (1/2) × 450 × (18)²
(K.E.)₁ = 72900 J
The final speed of the cart, v = 13 m/s
The final kinetic energy of of the cart = (1/2) × 450 × (13)²
(K.E.)₂ = 38025 J
The change in the kinetic energy of the cart = (K.E.)₂ - (K.E.)₁
Change in the kinetic energy = 72900 - 38025 = 34875 J
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An isloated point charge produce an electric field with magnitude E at a point 2 m away. At a point 1 m from the charge magnitude of the charge is .. A. E B. 2E C. 4E D. E/2
Answer:
the correct answer is C, E’= 4E
Explanation:
In this exercise you are asked to calculate the electric field at a given point
E = [tex]k \frac{q}{r^2}[/tex]
indicates that the field is E for r = 2m
E = [tex]\frac{ k q}{4}[/tex] (1)
the field is requested for a distance r = 1 m
E ’= k \frac{q}{r'^2}
E ’= k q / 1
from equation 1
4E = k q
we substitute
E’= 4E
so the correct answer is C
The speed of light in air is 3 x 108 m/s. The speed of light in ice is 2.29 x 108 m/s. What is the refractive index from air to ice?
Answer:
η = 1.31
Explanation:
The formula for the refractive index of from air to some other medium is given by the following formula:
[tex]\eta = \frac{c}{v}\\[/tex]
where,
η = refractive index = ?
c = speed of light in air = 3 x 10⁸ m/s
v = speed of light in ice = 2.29 x 10⁸ m/s
Therefore, using these values in the equation we get:
[tex]\eta = \frac{3\ x\ 10^8\ m/s}{2.29\ x\ 10^8\ m/s} \\[/tex]
η = 1.31
100 POINTS!!!
Which condition is NOT necessary for a hurricane to form?
warm ocean waters
very low air pressure
high air pressure
warm, moist air rising
Answer:
very low air pressure and that's not 100 points
A student makes a homemade resistor from a graphite pencil 5.00 cm long, where the graphite is 0.05 mm in diameter. The resistivity of the graphite is rho=1.38×10−5Ω/mrho=1.38×10−5Ω/m . The homemade resistor is place in series with a switch, a 10.00-mF uncharged capacitor and a 0.50-V power source. (a) What is the RC time constant of the circuit? (b) What is the potential drop across the pencil 1.00 s after the switch is closed?
Answer:
(a) RC time constant of the circuit is 6.9 × 10⁻⁶ ms
(b) The potential drop across the capacitor 1.00 s after the switch is closed is 0 V
Explanation:
The given parameters are
The length of the graphite pencil, L = 5.00 cm
The diameter of the graphite, D = 0.05 mm
The resistivity of the graphite, ρ = 1.38 × 10⁻⁵ Ω/m
The capacitance of the capacitor, C = 10.0 mF
The voltage of the power source, V = 0.50-V
(a) The RC time constant of the circuit, τ, is given as follows;
τ = R × C
Where;
R = The resistance of the graphite = L × ρ
C = The capacitance of the capacitor
∴ R = 5.00 cm × 1.38 × 10⁻⁵ Ω/m = 6.9 × 10⁻⁷ Ω
RC time constant of the circuit, τ = 6.9 × 10⁻⁷ Ω × 10.0 mF = 6.9 × 10⁻⁶ ms
RC time constant of the circuit, τ = 6.9 × 10⁻⁶ ms
(b) The potential drop after t = 1.00 s is given as follows;
[tex]i = \dfrac{V}{R} \cdot e^{-\dfrac{t}{R\cdot C} }[/tex]
Where;
I = The current in the circuit
V = The voltage in the circuit = 0.50 V
R = resistance in the circuit = 6.9 × 10⁻⁷ Ω
C = The series capacitance = 10.0 mF
t = The time taken = 1.00 s
Plugging in the variable values, gives;
[tex]I = \dfrac{0.5}{6.9 \times 10^{-7}} \cdot e^{-\dfrac{1.00}{6.9 \times 10^{-7}\times 10.0 \ mF} } = 0[/tex]
V(1) = I·R = 0 × R = 0
The potential drop across the capacitor 1.00 s after the switch is closed, V(1) = 0 V
An object carries a +15.5 µC charge. It is 0.525 m from a -7.25 µC charge. What is the magnitude of the electric force on the object?
Answer:
the force of attraction between the two charges is 3.55 N.
Explanation:
Given;
first charge carried by the object, q₁ = 15.5 µC
second charge carried by the q₂ = -7.25 µC
distance between the two charges, r = 0.525 m
The force of attraction between the two charges is calculated as;
[tex]F = \frac{kq_1q_2}{r^2} \\\\F = \frac{(9\times 10^9)(15\times 10^{-6})(7.25\times 10^{-6})}{(0.525)^2} \\\\F = 3.55 \ N[/tex]
Therefore, the force of attraction between the two charges is 3.55 N.
Answer all of these questions and you will get the brainlist
Answer:
2 ans : the bell has 8550 J energy
Answer:
1. kinetic energy = ½mv²
m= 2.1 kg
v = 30m/s
Ek = ½ ×2.1×30×30
= 945J
2. potential energy = mgh
m = 190kg
g = 9.8
h = 45m
Ep = 190×9.8 × 45
= 83790J
3.potential energy = mgh
m= 75kg
g= 9.8
h = 300m
Ep = 75×9.8×300
= 220,500J
A construction worker transfers 6000000 J in a n 8 hour day of work. What is their average power output? just need a quick answer with the working, thanks
Answer:
208.33 W
Explanation:
Using,
P = W/t.......................... Equation 1
P = Average power output, W = total work, t = total time.
From the question,
Given: W = 6000000 J, t = 8 hours = (8×60×60) = 28800 s
Substitute these values into equation 1
P = 6000000/28800
P = 208.33 W.
Hence the average power output is 208.33 W
You plan to visit a friend who lives 30 miles away. You predict that your average speed for this trip will be 50 miles per hour. How long will your trip take?
0.4 hours (24 centimeters)
0.8 hours (48 centimeters)
0.6 hours (36 minutes)
1.66 hours (~100 minutes)
Answer:
.6 hours
Explanation:
to find time you divide distance by speed
more mass an object has _____ its gravitational force. HHHHHHHHHHHHHHHHHHHHHHEEEEEEEEEEEEEEEELLLLLLLLLLPPPPPPPPPPP
I think the word would be increases. I don't know what the options are though.
A 0.22kg mousetrap car has 3.1 J of potential energy due to the spring in the mouse
trap. What is the maximum speed the car will reach? Show your work and include units.
Answer:
r56
Explanation:
The gravitational force between two bodies is 250N . What will the new force be if one of the masses is tripled?
If one of the masses is tripled, then their product is tripled, and the force between them is tripled. The new force is 750N .
The four balls in the diagram below are made of the same material are sold
Why is the force of gravity between the balls in pair 2 greater than the force of gravity between the balls in pair 1
The balls in pair 2 are closer together than the balls in part 1
The balls in pair 2 have a grater mass than the balls in pair 1
The balls in pair 1 have more rolling friction than the balls in pair 2
The balls in pair 2 have more magnetic force than the balls in pair 2
Answer:
The balls in Pair 2 have a greater mass than the balls in pair 1.
Explanation:
I took the test.
Which of the following is considered to be a fine motor skill?
Jumping rope
Drawing
Running
Riding bicycle
Why does it take a long time to start Penicillin production?
Answer:
the growth of mycelial, by which reduction in carbohydrate level occurs in the medium. Because of this reduction in carbohydrate level
Explanation:
Which may result from an increase in friction?
decreased traction
increased speed
reduced wear and tear
generation of heat
Answer:
The Answer is B: to provide traction so that slipping does not occur
Explanation:
if it is wrong please correct me
work and power!
______is the amount of work done over time a. Efficiency C. Power b. Newton d. Horsepower
Answer:
The work done in a unit of time is C. Power.
Explanation:
Hope this helps
10. How much total work do you do when you lift a 50 kg microwave 1.0 m off the ground and then push it 1.0 m
across a counter with a force of 50 N?
Work formula:
[tex]W = Fd\cos(\theta)[/tex]
F = 50N, d = 1.0 m
When you lift something straight up, the angle of the force is 90º
cos(90º) is 0, so there's no work done when you lift the microwave off the ground
[tex]W = (50N)(1.0)(0) = 0[/tex]
F = 50N, d = 1.0 m
When you push the microwave, the angle is 0º and cos(0º) is 1. So there is work done here:
[tex]W = (50 N)(1.0m)(1)[/tex]
[tex]W = 50[/tex]
total work = 50 joules
Brainliest for correct answer :)
At which point on this graph do reactants begin to produce products as they collide?
Answer:b
Explanation:
i just did the quiz i was look for it too then got it
The point on this graph do reactants begin to produce products as they collide is B.
What is chemical reaction?The chemical reaction is the reaction between two reactants which led to the formation of products.
The products are substances which forms after reaction. The reactants are the substances which are original materials.
This graph shows how the reactants are reacted and products are formed in a chemical reaction.
As the reaction proceeds, the potential energy is higher when reactants begin to produce products.
Thus, the point on this graph do reactants begin to produce products as they collide is B.
Learn more about chemical reaction.
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please help me im struggling
Answer:
right
Explanation:
True or false, not all substances are soluble in water.
Answer:
I think ur answer would be true
Explanation:
hope this helps
A circuit has two batteries and a resistor as shown. In the figure, the terminal voltage of the 12 V battery is closest to _____.
a. 15.6 V
b. 13.2 V
c. 8.4 V
d. 10.8 V
e. 9.6 V
Answer:
a 15.6voltz
i Hope this helps