Answer:
The correct option is;
Rachael's motion energy is being turned into other types pf energy
Explanation:
Here we have Rachael pushing off from the wall to generate motion energy. The motion energy makes Rachael glide such that she is displaced while at the same time she overcomes resistances to the motion, (rolling) of the tires from the ground as well as generates some audible noise and heat. These are all forms of energy that takes up the initial motion energy that Rachael had.
Final answer:
In Rachel's motion example, the key true statements are that her motion energy is being converted into other forms of energy and that friction from the ground is slowing her down. Energy conservation and friction are fundamental concepts in explaining her motion.
Explanation:
Rachel is wearing roller skates and is standing next to a wall. She pushes off from the wall and then glides to a stop. Let's examine which statements about Rachel's motion are true:
The force from the wall is becoming less and less as Rachel glides on her skates. False. The force from the wall is applied during the initial push and does not continue to act on Rachel as she glides.Rachel’s motion energy is naturally going down and the energy is disappearing. False. Energy does not disappear; it is converted into other forms according to the law of conservation of energy.Rachel’s motion energy is being turned into other types of energy. True. As Rachel glides and eventually stops, her kinetic energy is converted into other forms, such as heat due to friction.There is a force by the ground slowing Rachel down. True. This force is friction, which opposes the motion and contributes to Rachel's stop. There is a force by the ground that keeps Rachel moving for a while before she stops. False. The ground does not apply a force to keep Rachel moving. The motion observed is due to the initial force she applied by pushing off the wall and inertia.Light waves can be reflected, refracted and absorbed. Which of the following is an example of light waves being absorbed?
A.
A ray of light travels from the Sun to Earth's atmosphere.
B.
A magnifying lens increases the image size of a penny.
C.
A road's black pavement becomes hot in the sunlight.
D.
A mirror changes the direction of a light ray.
STUDY ISLAND
Answer:
C
Explanation:
Big Brain ;3
Final answer:
Black pavement becoming hot in the sunlight is an example of light waves being absorbed, as the pavement captures the light's energy, converting it into heat.
Explanation:
When light travels from one medium to another, some of the light is transmitted, some is reflected, and some is absorbed. An example of light waves being absorbed is when a road's black pavement becomes hot in the sunlight. This absorption happens because the pavement captures the energy of the light waves, converting it to heat, which makes the pavement hot. This process is why black-coloured surfaces heat up more in the sunlight than lighter-coloured surfaces, due to their higher absorption capacity.
A science teacher ran a marathon. After the race she showed her students the silver blanket she was given to keep her warm.A group of students investigated how the colour of the blanket affected how much infrared radiation is absorbed
Answer:
In summary the blanket that is metallic reflects electromagnetic waves
Explanation:
The teacher running the marathon generates a quantity of heat that the body must release to keep its temperature constant, one of the ways to release this energy in the form of electromagnetic radiation in the infrared range.
The matte with is silver should be metallic, so it reflects light at all wavelengths, so that the infrared light returns to the body and decreases the radiation radiation emitted, thus keeping it warmer.
In summary the blanket that is metallic reflects electromagnetic waves
what is the distance between two spheres, each with a charge 2.5x10-6 C when the force between them is 0.50 N
Answer:
The distance between charges is 0.33 m.
Explanation:
We have,
The charge on each sphere is [tex]2.5\times 10^{-6}\ C[/tex]
Force between charges is 0.5 N
It is required to find the distance between spheres. The force between two charges is called electrical force. The force between them is given by :
[tex]F=\dfrac{kq^2}{r^2}[/tex]
r is distance between charges
[tex]r=\sqrt{\dfrac{kq^2}{F}} \\\\r=\sqrt{\dfrac{9\times 10^9\times (2.5\times 10^{-6})^2}{0.5}} \\\\r=0.33\ m[/tex]
So, the distance between charges is 0.33 m.
Final answer:
To find the distance between two spheres with identical charges of 2.5×10-6 C experiencing a 0.50 N force, use Coulomb's Law and rearrange it to solve for the distance, which is the square root of the product of Coulomb's constant, the magnitude of the charges, divided by the force.
Explanation:
The distance between two spheres, each with a charge of 2.5×10-6 C, when the force between them is 0.50 N, can be calculated using Coulomb's Law. The formula for Coulomb's Law is F = k × (|q1×q2|) / r2, where F is the force between the charges, k is Coulomb's constant (approximately 8.99×109 N·m2/C2), q1 and q2 are the charges, and r is the distance between the centers of the two charges.
By rearranging the formula to solve for r, we get r = √(k × (|q1×q2|) / F). Plugging in the values we have:
k = 8.99×109 N·m2/C2q1 = 2.5×10-6 Cq2 = 2.5×10-6 CF = 0.50 NThe charge on each sphere is 2.5* 10^(-6)\ C
Force between charges is 0.5 N
It is required to find the distance between spheres. The force between two charges is called electrical force. The force between them is given by :
F=(kq^2)/(r^2)
r is distance between charges
r=\sqrt{(kq^2)/(F)} \n\nr=\sqrt{(9* 10^9* (2.5* 10^(-6))^2)/(0.5)} \n\nr=0.33\ m
So, the distance between charges is 0.33 m.
What is the speed of light across space?
Answer:
299,792 kilometers per second.
Explanation:
Hope I helped ya.
< Sarah >
Answer: 300 million meters per second
Explanation:
Srry if I'm wrong
why are electrical outputs from a turbine generator highest during spring tide
Answer:
A
Explanation:
because if the tides come in faster that means that more energy could be harnessed.
A large manufacturing company releases chemicals into the air every day. The chemicals eventually make their way into local bodies of water, killing many of the organisms that live in these areas.
Which best describes this situation?
A.habitat destruction due to pollution
B.habitat destruction due to poaching
C.pollution due to poaching
D.poaching due to habitat destruction
Answer:
Habitat deconstruction due to pollution
Explanation:
Hope this helps mate! :)
What kind of mirrors are typically used for security purposes?
O A. diverging
B. convex
O C. converging
D. concave
Convex Mirrors are the mirrors that are used for security purposes.
What kind of mirrors are typically used for security purposes?Convex Mirrors are the type of mirrors that are used in road safety, security and observation applications. For example, convex security mirrors act as effective deterrents when used in shops and convex safety mirrors help to avoid collisions.
So we can conclude that Convex Mirrors are the mirrors that are used for security purposes.
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The Convex mirror is the mirror that is generally used for security purposes (Option A and B).
What is a mirror?The term mirror refers to any reflecting surface. There are different kinds of curved mirrors such as;
parabolic mirrorConcave mirrorConvex mirrorThe Convex mirror is used for security purposes because they help to magnify the image and broaden the scope of view allowing the store attendants to see better.
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How can the image be described? Check all that apply. (Interpreting Ray Diagrams)
Answer:
the object is kept away from the focus of a convex lens. it form a real but inverted image of the object on the opposite side of the lens.
Who is good in physics??
Answer:
joe
Explanation:
mama
Which box depicts the tissue level of organization?
A) P
B) Q
C) R
D) S
Answer the 3 questions at the bottom, and this is about Newton’s 1st Law of Motion.
10 Points!!!!!
8. What is the frequency of the standing wave shown?
a. 12 Hz
b. 24 Hz
c. 36 Hz
d. 48 Hz
9. What would be the fundamental (1st harmonic) frequency of the string?
a. 12 Hz
b. 24 Hz
c. 36 Hz
d. 48 Hz
Answer:
while using brainly app. there is an option of uploading image of diagram, graph or plot. plz use that feature to upload image of the standing wave so that your question can be properly answeres
At 20°C, a length of copper wire has a resistance of 10.0 Ω What is its resistance when the wire is heated to 65°C? Let α = 0.004 at 20°C. Show all work and include units of measure. (2 points)
An object is placed 9.5 cm in front of a convex spherical mirror. Its image forms 3.2 cm behind the mirror. What is the radius of curvature of the mirror? Show all work. (2 points)
A candle is placed in front of a concave spherical mirror of focal length 9.60 cm. The image of the candle is inverted and 3.40 times as large as the candle itself. What is the distance of the candle to the mirror? Show all work and provide units of measure. (2 points)
An arrow pointing upward is placed to the left of a thin converging lens, as shown in the diagram. To identify the location of the image, a student draws three principal from the arrow. What feature should all three principal rays have in common? (2 points)
Dinosaur fossils are over 65 million years old. If some carbon from the dinosaur’s body remained in the fossil, would radiocarbon dating be useful for determining the age of the fossil? (1 point)
Yes, radiocarbon dating is useful for carbon-containing specimens of any age.
No, the carbon would have bonded chemically with other elements.
No, too much of the carbon-14 would have decayed for radiation to be detected.
A radioisotope has a half-life of 5.50 min and an initial decay rate of 7200 Bq. What will be the decay rate after 18.0 min? Show all work and include units of measure. (2 points)
A neutral atom of tin (Z = 50) has 69 neutrons. (a) How many protons does it have? (b) What is its mass number? (2 points)
Which type of nuclear reaction, fission or fusion, is used by nuclear power plants to produce electricity? Why? Be sure to include a brief explanation of the difference between fusion and fission. (2 points)
Radon-222 undergoes an alpha decay to become polonium-218. This reaction is an intermediate in a decay series that begins with uranium-238 and ends in lead-206.
A 1.0-gram sample of pure uranium-238 is sealed in a container at time = 0 years. To calculate the amount of radon-222 present in the container at any moment in the future, what is the minimum amount of information that must be known? (1 point)
The half-life of each decay reaction in the series from uranium-238 to lead-206
The half-life of each decay reaction in the series from uranium-238 to polonium-218
The half-life of each decay reaction in the series from uranium-238 to radon-222
The longest half-life in the series from uranium-238 to radon-222
The mass number of a neutral atom of iron (Z = 26) is 56. How many electrons does it have? (1 point)
56
30
26
13
Answer:
Identify arrows pointing to bonding electrons.
✔ a, b, d
Identify arrows pointing to nonbonding electrons.
✔ c
Identify arrows pointing to structures containing sigma bonds.
✔ a, b, d
Identify arrows pointing to structures containing pi bonds.
✔ a
Explanation:
On edg 2020
An atom of 6/2 He decays by beta decay. What atom is left after decay
Answer:
6/3 LI
Explanation:
Which of the moon’s properties prevents it from being pulled inward by earth?
Answer:
Inertia
Explanation:
Inertia is the inherent property of an object to remain in its state of rest or motion without being disturbed.
Answer:
inertia
Explanation:
What determines the strength of the electric force?
1) My 14V car battery could be used to charge my laptop, but I need to use an inverter to first convert it to a standard 120V. Then my laptop charge cord has a resistor inside which ensures that 1.6A of current flow through to the laptop. What is the resistance in the charge cord?
2) My laptop charge cord actually has another inverter inside tat converts the electricity to 19.5V and 3.33A. What is the resistance in the cord that accomplishes this?
Answer:
1) Charge chord resistance is 75 Ω
2) Charge chord resistance is 6.33 Ω
Explanation:
1) To answer the question, we note that the the formula voltage is found as follows;
V = IR
Therefore,
[tex]R = \frac{V}{I} = \frac{120}{1.6} = 75 \, \Omega[/tex]
2) Where the voltage, V = 19.5 V and the current, I = 3.33 A, we have;
Initial resistance R₁ = 19.5 V/(3.33 A) = 5.86 Ω
However, to reduce the current to 1.6 A, we have;
[tex]R_T = \frac{19.5}{1.6} = 12.1875 \ \Omega[/tex]
Therefore, where the resistance is found by the sum of the total resistance we have;
[tex]R_T[/tex] = R₁ + Charge chord resistance
∴ 12.1875 = 5.86 + Charge chord resistance
Hence, charge chord resistance = 6.33 Ω
(1) The resistance in the charge cord at the given standard voltage is 75 ohms.
(2) The resistance in the cord that accomplishes the given voltage and current is 6.33 ohms.
The given parameters;
voltage of the car battery, V = 14 Vstandard voltage, = 120 Vcurrent in the laptop charger, I = 1.6 AThe resistance in the charge cord at the given standard voltage is calculated as follows;
[tex]V = IR\\\\R = \frac{V}{I} \\\\R = \frac{120}{1.6} \\\\R = 75 \ ohms[/tex]
The initial resistance when the voltage is 19.5 V and current is 3.33 A;
[tex]R = \frac{V}{I} \\\\R = \frac{19.5}{3.33} \\\\R = 5.86 \ ohms[/tex]
The total resistance when the current in cord is calculated as;
[tex]R = \frac{V}{I} \\\\R = \frac{19.5}{1.6} \\\\R = 12.19 \ ohms[/tex]
The internal resistance is calculated as;
[tex]r = 12.19 - 5.86\\\\r = 6.33 \ ohms[/tex]
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A softball player steals second base while rubbing at her top speed of 4.2 m/s in 1.75 seconds. What is her acceleration?
13 Points!!
Answer:
2.4m/s^2
Explanation:
To find the acceleration you divide velocity by the time.
Look of the diagram below. What condition does this show?
Enter your answer
Answer:
hypermetropia
Explanation:
long-sightedness.
A man is 6ft tall. What is the smallest size plane mirror he can use to see his entire image.
The smallest size plane mirror he can use is 3 feet tall, ensuring he can see his entire image reflected in the mirror
To see his entire image in a plane mirror, the mirror needs to be at least as tall as the man's height. However, since only half of his height is required for the mirror, the smallest size plane mirror he can use is half his height.
Given that the man is 6 feet tall, the smallest size plane mirror he can use to see his entire image would be [tex]\( \frac{6}{2} = 3 \)[/tex] feet tall. Therefore, the smallest size plane mirror he can use is 3 feet tall.
A series circuit consists of four resistors connected in series with values of 1.1,
11, 110, and 1100 ohms. What is the equivalent resistance of the circuit?
Answer:
Explanation:
hope this provides you with some clarity :)
To find the equivalent resistance of a series circuit consisting of resistors with values 1.1 ohms, 11 ohms, 110 ohms, and 1100 ohms, simply add the values together, resulting in an equivalent resistance of 1222.1 ohms.
The question involves calculating the equivalent resistance of a series circuit containing four resistors with the specified values of 1.1 ohms, 11 ohms, 110 ohms, and 1100 ohms. In a series circuit, the total or equivalent resistance can be found by simply adding up all the resistance values of the individual resistors.
To find the equivalent resistance of the circuit, we add the values of the resistors:
1.1 ohms11 ohms110 ohms1100 ohmsThe sum of these values gives us the total resistance:
1.1 + 11 + 110 + 1100 = 1222.1 ohms.
Therefore, the equivalent resistance of the series circuit is 1222.1 ohms.
A 0.4 kg ball is thrown straight up into the air with a velocity of 12.2 m/s. What maximum height will it reach?
Answer:
Maximum height is 7.59 m.
Explanation:
We have,
Mass of a ball is 0.4 kg
It is thrown straight up into the air with a velocity of 12.2 m/s.
It is required to find the maximum height reached by the ball.
Concept used : Law of conservation of energy.
Solution,
Here, the energy of the ball remains conserved. Let h is the maximum height reached by the ball such that,
[tex]\dfrac{1}{2}mv^2=mgh\\\\h=\dfrac{v^2}{2g}\\\\h=\dfrac{(12.2)^2}{2\times 9.8}\\\\h=7.59\ m[/tex]
So, the maximum height reached by the ball is 7.59 m.
How much force is required to produce a torque of 100 Nm if the force is applied at an angle of 40 at a distance of 25 cm from the pivot?
Answer:
Force, F = 622.28 N
Explanation:
It is given that,
Torque, [tex]\tau=100\ N-m[/tex]
Angle between force and displacement, [tex]\theta=40^{\circ}[/tex]
Distance, d = 25 cm = 0.25 m
We need to find the force required to produce the torque. Torque produced by an object is given by :
[tex]\tau=Fd\sin\theta[/tex]
F is force required to produce torque
[tex]F=\dfrac{\tau}{d\sin\theta}\\\\F=\dfrac{100}{0.25\times \sin(40)}\\\\F=622.28\ N[/tex]
So, applied force is 622.28 N.
Explain, in terms of energy, why a pendulum swings lower and lowers when you let go of it
Answer:
because of its energy store it had potential and gravity energy stores befoare you let it go and when it swings it lets off its gravitational enery and the potential energy goes to
Explanation:
(ii)
Calculate the amount of energy required to melt 15 kg of ice at 0 °C.
Specific latent heat of fusion of ice = 3.4 x 105 J/kg.
Energy =
Answer:
uekdjdbrjrnkfkdkfkff
Explanation:
E=mc(tetha)
=15(3.4x105)(0)
=0joules
1. How much work is done on a stalled car if a man pushes with a Force of 3500 N and
moves the vehicle forward 10 m ?
Answer:
35000
Explanation:
Since work is force times distance, W = F x D all you have to do is multiply the force: 3500N times the distance: 10m and you get 35000
Hope this helped and pls mark as brainliest!
~Luna
A woman is pushing a 38.7kg lawnmower initially at rest with a 68.7N forward force against friction. The lawnmower speeds up to 1.44m/s in 3.81s. How much force does friction evert on the mower
Answer:
expected acceleration= 68.7/38.7=1.77 m/s^2
witnessed acceleration = 1.44/3.81 = 0.37 m/s^2
difference = 1.4m/s^2
so friction = 38.7× 1.4= 54.18 N
The magnitude of force does friction evert on the mower is 54.07 N.
What is speed?Speed is distance travelled by the object per unit time. Due to having no direction and only having magnitude, speed is a scalar quantity With SI unit meter/second.
Given parameters:
Mass of the lawnmower: M = 38.7 kg.
Force applied on it: F = 68.7 N.
Final speed of the lawnmower: v = 1.44 m/s.
Time taken: t = 3.81 s.
Then, acceleration of the lawnmower: a = increase in speed/time
= 1.44/3.81 m/s² = 0.38 m/s².
Hence, resisting friction force = applied force - ma
= 68.7 N - 38.7 × 0.38 N
= 54.07 N.
Hence, the magnitude of force does friction evert on the mower is 54.07 N.
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Inside a television picture tube there is a build-up of electrons (charge of 1.602 × 10–19 C) with an average spacing of 38.0 nanometers between electrons. Find the electric field inside the picture tube. (Round to three significant figures.)
Answer:
Electric field, [tex]E=9.97\times 10^5\ N/C[/tex]
Explanation:
We have,
Charge on electron is [tex]1.602\times 10^{-19}\ C[/tex]
Distance between electron is 38 nm.
It is required to find the electric field inside the picture tube. The electric field at a distance r is given by :
[tex]E=\dfrac{kq}{r^2}\\\\E=\dfrac{9\times 10^9\times 1.6\times 10^{-19}}{(38\times 10^{-9})^2}\\\\E=9.97\times 10^5\ N/C[/tex]
So, the electric field inside the picture is [tex]9.97\times 10^5\ N/C[/tex]
Answer:
997,000
Explanation:
just did the assignment for electric fields, grade 10. have a nice day :)
What is potential energy?
Energy released
Energy stored
Moving Energy
Which kind of wave interaction is shown?
A. Absorbtion
B.diffraction
C.refraction
D. Reflection
Answer:diffraction
Explanation: