Question :
If a body acquires a charge of -0.02 C, has it gained or lost electrons? Many?
Solution :
We know, charge gained is shown by negative sign.
Since, charged acquired is given as -0.02 C .
Therefore, it is body has gained electrons.
Now, number of electrons is given by :
[tex]n = \dfrac{net\ charge}{charge \ on \ one \ electron}\\\\n = \dfrac{-0.02}{-1.60 \times 10^{-19}}\\\\n = 1.25\times 10^{17}[/tex]
Hence, this is the required solution.
What type of material are magnets usually made of
Answer:
They come from metal elements or alloys.
Explanation:
Different materials produce magnets of varying strengths. Ceramic magnets, also known as ferric magnets, are made of iron oxide in a ceramic composite. Samarium cobalt magnets are created from the combination of cobalt and samarium, which is a rare-earth element. Neodymium magnets contain boron, iron and neodymium, also a rare-earth element. The strongest naturally occurring magnet is lodestone, a form of magnetite. It attracts even small objects, such as staples and paper clips.
a loaded sack of total mass is 1000 gramme falls down from the floor of a lorry 200cm high, calculate the workdone by the gravity of the loads
Answer:
W = 20 J
Explanation:
Given that,
The mass of a loaded sack, m = 1000 g = 1 kg
It falls down from the floor of a lorry 200 cm high, h = 2 m
We need to find the work done by the gravity. The work done by an object under the action of gravity is given by :
W = mgh
Substitute all the values,
W = 1 × 10 × 2
= 20 J
Hence, the required work done by gravity is equal to 20 J.
What is a disadvantage of using nuclear power to produce electricity?
Answer:
The further implementations of nuclear power are limited because although nuclear energy does not produce CO2 the way fossil fuels do, there is still a toxic byproduct produced from uranium-fueled nuclear cycles: radioactive fission waste.
Explanation:
Answer:
Disadvantages of Nuclear Power
The further implementations of nuclear power are limited because although nuclear energy does not produce CO2 the way fossil fuels do, there is still a toxic byproduct produced from uranium-fueled nuclear cycles: radioactive fission waste.
Explanation:
Use the drop-down menu to answer the question.
According to "Take a Closer Look", what type of lens is used to correct nearsightedness?
Answer: A.) concave lens
Explanation: i hope this helps shawtay :)
In general, a concave lens (also known as a diverging lens) is used to correct nearsightedness, as stated in "Take a Closer Look." Option C is correct.
What is the lens?A lens is an optical component that is used to refract (bend) and focus light. It is typically made of a transparent material, such as glass or plastic, and has a specific shape that allows it to alter the path of light as it passes through.
Here,
In general, a concave lens (also known as a diverging lens) is used to correct nearsightedness, as stated in "Take a Closer Look."
A concave lens is thinnest at the center and thicker at the edges, which causes light rays passing through the lens to diverge or spread out. By placing a concave lens in front of a nearsighted eye, the lens causes incoming light rays to diverge more before they reach the eye's lens, which then focuses them properly on the retina, resulting in clearer vision.
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An object is travelling in a straight line. The diagram is the speed-time graph for
the object.
At which labelled point is the object accelerating at a changing rate?
The point on the graph that object is accelerating at a changing rate is point A.
What is acceleration?
Acceleration of an object is the rate of change of velocity with time.
a = Δv/Δt
where;
Δv is change in velocityΔt is change in timeThus, the point on the graph that object is accelerating at a changing rate is point A.
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A 1300 kg car traveling with a speed of 3.5 m/s executes a turn with a 8.5 m radius of curvature.
Calculate the centripetal acceleration of the car.
I need the answer please help!
Answer:
1.4 m/s/s (2.s.f)
Explanation:
The formula for centripetal acceleration is:
[tex]a=\frac{v^{2} }{r}[/tex], where v is velocity and r is the radius.
In the question we are given the information that the car has a mass of 1300kg, a velocity of 2.5m/s, and a turn radius of 8.5m which are all the values we need. Therefore we can simply substitute in the values to solve the question:
[tex]a=\frac{3.5^{2} }{8.5} \\a=1.4[/tex]
Therefore the centripetal acceleration of the car is 1.4m/s/s. (2.s.f)
Hope this helped!
All electric charge is based on the what in Atoms
Answer:
c. Protons and electrons
Explanation:
electrons carry out negative charge
protons carry out positive charges
Un vehículo que desciende hacia la luna tiene una velocidad vertical hacia la superficie de la luna de 35 m/s. Al mismo tiempo, tiene una velocidad horizontal de 55m/s. ¿Cuál es la velocidad del vehículo en su trayectoria de descenso? ¿Qué ángulo forma la trayectoria con la vertical?
Answer:
1. La velocidad del vehículo en su trayectoria de descenso es 65.2 m/s.
2. El vehículo forma un ángulo de 57.5° con la vertical.
Explanation:
1. La magnitud de la velocidad del vehículo está dada por la suma de las componentes del vector en la dirección vertical (y) y horizontal (x):
[tex] v^{2} = v_{x}^{2} + v_{y}^{2} [/tex]
[tex] v = \sqrt{v_{x}^{2} + v_{y}^{2}} = \sqrt{(55 m/s)^{2} + (35 m/s)^{2}} = 65.2 m/s [/tex]
Entonces, la velocidad del vehículo en su trayectoria de descenso es 65.2 m/s.
2. El ángulo que forma la trayectoria con la vertical se puede calcular con trigonometría:
[tex] tan(\theta) = \frac{v_{x}}{v_{y}} [/tex]
[tex] \theta = tan^{-1}(\frac{v_{x}}{v_{y}}) = tan^{-1}(\frac{55}{35}) = 57.5 ^{\circ} [/tex]
Por lo tanto, el vehículo forma un ángulo de 57.5° con la vertical.
Espero que te sea de utilidad!
3. Silk fibre is obtained from______
whereas artificial silk is obtainedby
chemical treatment of________
Answer:
Silk fibre is obtained from silkworms
whereas artificial silk is obtained by
chemical treatment of wood pulp/cellulose.
Explanation:
Artificial silk, or rayon, is made from cellulose, obtained from cotton or wood pulp.
So any one of them in 2nd blank is correct.
Find the height of the coconut from the ground at the moment the arrow hit it.
Answer:
[tex]v = u + at \\ 0 = 45 \sin(20) - 9.81 \times t \\ t = 1.56s[/tex]
Which action could a student take to produce a longitudinal wave with a large amplitude?
A. Drop a pebble in a pond.
B. Light a candle.
C. Bang on a drum.
D. Stand as still as possible.
Answer:
Bang on a drum.
Explanation:
Amplitude is making loud sounds
If the Angle of Incidence is 14º, what is the Angle of Reflection?
Answer:
Explanation:
The Law of reflection states that angle of incidence equals angle of reflection.
So Angle of reflection is 14° also.
Martin rides his motorcycle at 20 m/s. suddenly he sees a row of stones
blocking the road 170 m ahead. He applies the brakes and the motorcycle is
decelerated at 2 m/s?. Justify will he be able to stop in time?
Answer: Yes
Explanation:
Given
Martin initial speed is [tex]u=20\ m/s[/tex]
Stones is at 170 m ahead
Deceleration [tex]a=2\ m/s^2[/tex]
Using the equation of motion [tex]v^2-u^2=2as[/tex]
Insert the values
[tex]0-20^2=2\times (-2)s\\s=\dfrac{400}{4}\\\\s=100\ m[/tex]
So, it took 100 m to stop completely. Hence martin will be able to stop in time.
Which device transforms electrical energy to mechanical energy?
A. a fan
B. an iron
C. iPod
Kinetic energy is the energy of . It increases with and .Potential energy is the energy of or . It increases with , and
Answer:
k is the energy of motion it increase with four of load you carry
If another vehicle is trying to pass your vehicle,
your speed
Increase
Maintain
<
Ignore
Reduce
Answer:
Reduce you're speed, and let the other vehicle pass you
. A train passes a stationary observer. Which of the following best describes how the amplitude and the
apparent frequency of the sound waves heard by the observer change as the train moves away?
What process is represented by this redox equation ? 6H 2 O+6CO 2 C 6 H 12 O 6 +6O 2
Answer:
C. Photosynthesis
Explanation:
The redox reaction given in this question is given as follows:
6H2O + 6CO2 → C6H12O6 + 6O2
In this reaction, water (H2O) reacts with carbon dioxide (CO2) to form glucose (C6H12O6) and oxygen (O2). This is the general equation for PHOTOSYNTHESIS process, which is the process whereby plants manufacture their food (sugar) by combining water and carbon dioxide.
In the equation above, water is oxidized into oxygen, while carbon dioxide is reduced into glucose. This makes it an oxidation-reduction (redox) reaction.
1>3x>12 hhhhuuytttfff
Is This Related To Physics ?
Help me please!!!!!!!!!!
Answer:
B because 17100 is the half of the carbon
Marine science- question- what is climate change?
Answer:
Defined below
Explanation:
Climate change is simply the long term change in the average weather patterns that are associated with the local, regional and global climates of the earth. Climate change is usually driven by human activities like burning of fossils; natural processes like cyclic ocean patterns; external factors like volcanic eruptions.
true or false? rocks have organic materials and fossil remains in them
Answer:
trueeeee
Explanation:
A person walking in high heals can damages the floor by making small dimples in the floor since all their weight is concentrated on the tip of the high heal. It the person weighs 81 kg and the high of the tip of the high heal is 3.5 cm2, what is the force over the floor?
Given :
Mass of person, m = 81 kg.
Area of high heal, A = 3.5 cm² = 0.00035 m².
To Find :
The pressure applied by the heal on the ground.
Solution :
We know, pressure is given by :
[tex]P = \dfrac{mass}{Area}\\\\P = \dfrac{81}{0.00035} \ N/m^2\\\\P = 231428.57 \ N/m^2[/tex]
Hence, this is the required solution.
Why do you see a rainbow when you look at white light through a prism?
please don't send links or files
Group of answer choices
components of white light (colors) were refracted into different amounts by the prism.
different colored of atoms passed through the prism and were knocked out.
the white light’s energy was diverted and converted into visible light.
the prism converted ultraviolet light to visible light.
Answer:
Sunlight is a mixture of colors. When it passes through a glass prism, some of the light is bent, or refracted, more than other portions. And just as sunlight passing through a prism is bent, so is sunlight passing through drops of water. This produces an atmospheric solar spectrum in the sky for all to see: a rainbow.
Explanation:
Suppose your class invites a person to give a speech. When you test out the sound system in the gym you find there are so many echoes the speaker cannot be understood. What needs to be done to fix this problem?
Answer:
You either need to lower the volume so the sounds intensity is lessened. Or you can pad the walls to absorb the sound rather than defect.
Explanation:
Sound intensity allows it to be heard further, but in an enclosed room it will start returning. Sound will deflect off of hard objects do to its interactions with solids. A softer and foamy material can dampen it.
Which one? A? B? C? D?
Answer:The answer is D.
Explanation:
What element is formed in the following nuclear reaction
Answer:
Oxygen or more precisely, the O-15 isotope.
Next, given the equivalent resistance,
Req(23), what is the equivalent
resistance, Reg, of the series
combination of R1 and Req(23)?
Ri
Req(23)
100 12
120 12
Answer:
Req= 220 ohm
Explanation:
In series combination just add the resistances.
Req=R1+Req(23)
Req=100+120
Req= 220 ohm
I WILLL GIVE BRAINLYEST!!!
The following map was created using modern technology to determine the overall temperature change of the oceans. What can be concluded about the relationship between temperature and salinity from the map? (10 points)
Group of answer choices
Areas of water with higher precipitation have a greater salinity.
Decreasing temperatures evaporate water slowly, causing an increase in salinity.
Increasing temperatures evaporate water faster, causing an increase in salinity.
The areas of water without temperature changes will have a greater salinity.
Answer:
Increasing temperatures evaporate water faster, causing an increase in salinity.
Explanation:
When the water molecules of the ocean become heated, they expand. ... Since warmer water thus can hold more salt and other molecules than cold water; it can have a higher salinity.
The correct option is C, increasing temperatures cause faster evaporation of water which results in an increase in salinity.
What does the map represent?Due to the link between ocean temperature and salinity, this map of ocean temperature can easily be compared to a map of ocean salinity.Salinity rises as water temperature rises, and vice versa: the lower the water's temperature, the higher the salinity. The Timor Sea, Arafura Sea, and the northern portion of the Coral Sea can all be seen on this map as having higher temperatures than most of the nearby waters. These regions' shallow water and proximity to the equator, as well as the influence of warm ocean currents, are the main causes of these higher temperatures. In turn, that would imply that they experience greater water evaporation, which adds to greater salt concentration, resulting in more salinity in the water than in other locations.Hence we can conclude that as the temperature rises, the process of evaporation takes place more rapidly which decrease the concentration of salt in water, which leads to higher salinity.
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Light sources create rays of light. These rays leave the source and travel in a
line until they hit a surface.
A.
broken
В.
straight
C.
curved
D.
bent
Answer:
C. curved
Explanation:
researchers have shown that light can also travel in a curve, without any external influence