20 minutes = 20/60 = 0.33 hr
0.7 kw * 0.33 hr = 0.231 kWh = 0.23 kWh
Plz mark as Brill
Energy used will be 0.23 kWh
What is Energy ?Energy is the capacity of a physical system to do work . The standard unit of energy is Joule(J).
Energy = power * time
Given :
power = 0.70 kW
time = 20 minutes = 20 / 60 hour
Energy = ?
Energy = 0.70 * (20/60)
= 0.23 kWh
Energy used will be 0.23 kWh
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How long would it take for a car to travel 500m if it was moving at a constant speed of 50.0 km/h?
a student is supplied with the following pieces of equipment:
• a small metal ball
• table tennis ball
• metre rule
• stop clock
• calculator
• light gate
• data logger
describe how the student can use this, or other additional equipment, to determine an accurate value for the acceleration of free fall (g). the student need not use all the equipment. show clearly what measurements should be taken and how the students should use these in determining (g). describe one source of error and how this might affect the value of (g).
(6 marks/year9/gcse)
Explanation:
Use a meter stick, small metal ball, stopwatch, calculator.
Have the students mark off a vetrtical distance from which to drop the metal ball. Ready the stopwatch, and start when the object is dropped and stop when the object contact the ground. Repeat 5 times and average the stopwatch times.
Now, use the formula d=vo+(1/2)at^2
There's no initial velocity, so d=(1/2)at^2
We know time and distance, so we can solve for a, acceleration.
2d=at^2
(2d)/(t^2)=a
Now, input the numbers gathered in the experiment in meters and seconds.
One source of error is human error (stopwatch timing)
Air resistance (although pretty negligible)
Sally accelerates a 250 kg cart at 3 m/s/s. What must be the net force?
Please help me please and you will get the brainlist
Answer:
4. Force = 178.6 Newton.
5. Acceleration = 2.28 m/s².
6. Force = 178.6 Newton.
Explanation:
4. Given the following data;
Acceleration = 3.8 m/s²
Mass = 47kg
Force = mass * acceleration
Force = 47 * 3.8
Force = 178.6 Newton.
5. Given the following data;
Force = 785N
Mass = 345kg
Acceleration = force/mass
Acceleration = 785/345
Acceleration = 2.28 m/s²
6. Given the following data;
Acceleration = 6m/s²
Force = 32N
Mass =force/acceleration
Mass = 32/6
Mass = 5.33 kilograms
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Which sentence supports this claim: Training their dogs to provide pet therapy is a fast-growing trend among dog-owners today.
The main job of a pet therapy dog is to allow people it doesn’t know to pet it and play with it.
In 2010, about 24,000 therapy dogs were registered with Therapy Dogs International.
The first known therapy dog was a Yorkshire Terrier named Smokey who comforted wounded soldiers.
Dogs make good therapy pets because they usually crave lots of attention and affection.
Answer:
Dogs make good therapy pets because they usually crave lots of attention and affection.
Answer: In 2010, about 24,000 therapy dogs were registered with Therapy Dogs International
Explanation:
1. Infer how the height of the lines on a seismograph change with an increase in
earthquake magnitude.
Answer:
his movement is proportional to the intensity of the earthquake,
Explanation:
An earthquake is a record of the intensity of an earthquake as a function of time.
Where the intensity is plotted on the y-axis, which corresponds to the vertical movement of the detector, this movement is proportional to the intensity of the earthquake, therefore the intensity increases the amplitude of the oscillation increases.
And the in x corresponds to time
The lines on a seismograph indicate the magnitude of an earthquake. The lines from the seismograph are indicative of seismic waves that the seismograph has recorded.
When there is a straight line on the seismograph, it means there are no earthquakes. However, if the lines become wiggly, it means that the ground is shaking.
How Earthquake Magnitude is measuredThe magnitude of the earthquake is determined from the logarithm of the amplitude of waves recorded by the seismographs.
In order to understand the amplitude of waves, you'd have to be versed with the anatomy of waves. Once the logarithm is computed (after adjustments for the distance between the seismographs and the epicenter of the earthquakes), it is checked against the Richter Magnitude Scale in order to place the earthquake in a category.
For example, an earthquake may be considered moderate if the adjusted amplitude of the waves recorded on the seismograph records 5.3 on the Richter Scale. On the other hand, a rating of 6.3 is considered a strong earthquake.
See the link below for the Anatomy of Waves:
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A uniform meter rule is balanced by 80N and 20N from its ends. Find the position of its pivot from the 20N end. Show your working please
Answer:
80 cm
Explanation:
From the diagram attached,
Sum of clockwise moment = sum of anticlockwise
ΣACW = ΣCW
20x = 80(100-x)
Solve for x
20x = 8000-80x
20x+8x = 8000
100x = 8000
x = 8000/100
x = 80 cm.
The position of its pivot from the 20 N end is 80 cm.
You drive home from school steadily at 90 km/hr for 145 km.
How long did it take you to get home?
Answer:
90km/hr I think but if it is wrong than sorry
The impulse formula allows us to relate the concepts of mass and velocity (an objects momentum) to that of:
1: The motion of an object
2: An objects position in space
3: force acting on an object over time
4: the direction an object travels
Answer:
3: force acting on an object over time
Explanation:
The impulse formula is: change in momentum = force x time
Δp = f x t
Can someone help me please
Metalloids
Metalloids have properties that are intermediate between metals and non-metals. They have properties that are difficult to characterize.
Physical Properties of Metalloids
State of matter - Solid
Lustre - Metallic lustre
Elasticity - Brittle
Conductivity - Semi-conductive in nature
Chemical Properties of Metalloids
Oxidation - They are capable of forming glasses.
Alloys - When mixed with metals, they form alloys.
Allotropic - Metallic and non-metallic allotropes are formed.
Melting - Few metalloids contract when they are melted.
Compounds - Compounds are formed when they react with halogens.
Common Properties of Metalloids
Metalloids are good semiconductors. The reactivity of metalloids is dependent on the properties of the elements they are reacting with. Electronegativity and ionization energy are between metals and non-metals.Non-Metals
Non-metals are those which lack all the metallic attributes. They are good insulators of heat and electricity. They are mostly gases and sometimes liquid. Some they are even solid at room temperatures like Carbon, sulphur and phosphorus.
Properties of Non metals
Characteristic properties of non-metals are high ionization energies and high electronegativity. Owing to these properties, non-metals usually gain electrons when reacting with other compounds, forming covalent bonds. Among the non-metals, the anionic dopants have a strong influence on the VB. Non-Metal dopants are carbon, nitrogen, fluorine, sulphur and iodine.
General properties of non-metals.
The atoms of non-metals tend to be smaller than those of metals. Several of the other properties of non-metals result from their atomic sizes. Non-metals exhibit very low electrical conductivities. The low or non-existent electrical conductivity is the most important property that distinguishes non-metals from metals. Non-metals have high electronegativities. This means that the atoms of non-metals have a strong tendency to attract more electrons than what they would normally have. Non-metals have high electronegativities. This means that the atoms of non-metals have a strong tendency to hold on to the electrons that already have. In contrast, metals rather easily give up one or more electrons to non-metals, metal therefore easily form positively charged ions, and metals readily conduct electricity. Under normal conditions of temperature and pressure, some non-metals are found as gases, some found as solids and one is found as liquid. In contrast, except mercury, all metals are solids at room temperature. The fact that so many non-metals exist as liquids or gases means that non-metals generally have relatively low melting and boiling points under normal atmospheric conditions. In their solid-state, non-metals tend to be brittle. Therefore, they lack the malleability and ductility exhibited by metals.Physical Properties of Non-Metals
Ductility is the property of the material to be stretched into wires but non-metals are not ductile except for carbon, as carbon fibres find uses in a wide variety of industries including sports and music equipment. Another property characteristic to metals is absent in non-metals called malleability. They can’t be drawn into sheets as they are brittle and break on applying pressure. They are not lustrous as they do not have any shiny appearance. They are not sonorous and do not produce a deep ringing sound when they are hit with another material. They are also bad conductors of heat and electricity except for graphite.A 0.5 kg mango falls 22 m from a tree, what is the potential energy of the mango?
Last question guys help
Answer:
I think the first reply me if I'm wrong sorry hehe
Which of these waves probably has the largest wavelength?
Answer:
I think it's the last one
Explanation:
good luck
Answer: The last one...8 waves per second
Explanation:
An object is hit with a force of 25 N and accelerates at a rate of 10 m/s/s. What is the mass of the object?
Answer:
2.5 kg
Explanation:
mass is force divided by acceleration25÷103) Magnets are used to separate steel cans from aluminum cans in recycling plants. How can
they be used for this?
(Will give brainliest if it's a proper answer)
Answer:
Since steel contains iron (a magnetic metal), the magnets will attract the steel cans since aluminum is not magnetic. This is used to separate the steel cans from the aluminum cans so they can be recycled separately.
can somebody definee newton1 word to word pls
Answer:
One newton is a unit of force equal to the force needed to move a one kilogram mass by one meter per second per second. Word originsThis word is named for Sir Isaac Newton (1642-1727), the great English mathematician and physicist who discovered gravity.
Explanation:
hope this help you
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Series Circuits and Parallel Circuits
How similar?
How different?
Answer:
series circuits have a line of several electrical patterns parallel curcuits are seperated
Explanation:
hope this helps..
A book that weighs 0.35 kilograms is kept on a shelf that’s 2.0 meters above the ground. A picture frame that weighs 0.5 kilograms will have the same gravitational potential energy as the book when it’s raised to a height of ____
meters.
(Use PE = m × g × h, where g = 9.8 N/kg. )
Answer:
E p = m · g · h
E p ( book ) = 0.35 kg · 9.8 m/s² · 2 m = 6.86 J
E p ( picture frame ) = 6.86 J
( same gravitational potential energy as the book )
6.86 = 0.5 · 9.8 · h
6.86 = 4.9 h
h = 6.86 : 4.9
h = 1.4 m
Answer: 1.4 M
How to calculate the period of a wave?
Answer:
The wave velocity and the wavelength are related to the wave's frequency and period by vw=λT or vw=fλ. The time for one complete wave cycle is the period T. The number of waves per unit time is the frequency ƒ. The wave frequency and the period are inversely related to one another.
Explanation:
T = 1 / f is the formula to calculate the period of a wave.
What is the period of the wave?The time it takes for two successive crests (one wavelength) to pass a specified point. The wave period is often referenced in seconds.
The calculation of period of wave is:
The formula for period is T = 1 / f ,
where "T" is period – the time it takes for one cycle to complete, and "f" is frequency.
To get period from frequency, first convert frequency from Hertz to 1/s.
Period refers to the time for something to happen and is measured in seconds/cycle.
In this case, there are 11 seconds per 33 vibrational cycles.
Thus the period is (11 s) / (33 cycles) = 0.33 seconds.
Therefore,
T = 1 / f is the formula to calculate the period of a wave.
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2. You push a 12.3-kg shopping cart with a force of 10.1 N.
(a) What is the acceleration of the cart?
(b) If the cart starts from rest, how far does it move in 2.50 s?
Plz answer quick
Answer:
Explanation:
The important part about this problem is the acceleration, which you must find by using
F = ma,
where F is the force applied,
m is the mass,
and a is the acceleration.
F = ma
10.1 N = (12.3 kg)a
a = 0.8211 m/s^2
Now use the kinematics equations.
d = vot + (1/2)at^2
where d is the distance moved,
vo is the initial velocity (0),
a is the acceleration,
and t is the time.
d = vot + (1/2)at^2
d = (0 m/s)(2.5 s) + (1/2)(0.8211 m/s^2)(2.5 s)^2
d = 2.57 m
a. The acceleration of the cart, is 0.821 [tex]m/s^2[/tex].
b. The car moved a distance of 30.63 meters starting from rest.
Given the following data:
Mass of shopping cart = 12.3 kgForce = 10.1 NInitial velocity, u = 0 m/s (since the cart is starting from rest). Time, t = 2.50 seconds.a. To find the acceleration of the cart, we would apply Newton's Second Law of Motion:
Mathematically, Newton's Second Law of Motion is given by this formula;
[tex]Acceleration = \frac{Force}{Mass}[/tex]
Substituting the given values, we have;
[tex]Acceleration = \frac{10.1}{12.3}[/tex]
Acceleration = 0.821 [tex]m/s^2[/tex]
Therefore, the acceleration of the cart, is 0.821 [tex]m/s^2[/tex].
b. To find the distance covered by the shopping cart, we would use the second equation of motion.
Mathematically, the second equation of motion is given by the formula;
[tex]S = ut + \frac{1}{2} at^2[/tex]
Where:
S is the distance covered. u is the initial velocity. a is the acceleration. t is the time measured in seconds.Substituting the values into the formula, we have;
[tex]S = 0(2.5) + \frac{1}{2} (9.8)(2.5)^2\\\\S = 0 + 4.9(6.25)[/tex]
Distance, S = 30.63 meters.
Therefore, the car moved a distance of 30.63 meters starting from rest.
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One of the smallest planes ever flown was the Bumble Bee II, which had a mass of 180 kg. If the pilot’s mass was 70 kg, what was the velocity of both plane and pilot if their momentum was 20,800 kg∙m/s to the west?
Answer:
no one help you this is bad app
what are the effects of ultraviolet sun rays????
Answer: UV rays, either from the sun or from artificial sources like tanning beds, can cause sunburn. Exposure to UV rays can cause premature aging of the skin and signs of sun damage such as wrinkles, leathery skin, liver spots, actinic keratosis, and solar elastosis. UV rays can also cause eye problems.
Explanation: Uv means ultraviolet
What is the smallest particle of an element that still retains of that element
A.compound
B.molecule
C.atom
D.mixture
Answer:
atom
Explanation:
the first guy who gave link this is for you:
we cannot use links in brainly
Thankyou.
A burning candle is placed 20 cm in front of a concave mirror of focal length 10cm. find the nature and position of the image formed
Answer:
:)
Explanation:
u = 20 cm
f = 10 cm
Object is at centre of curvature
So , image will be formed at centre of curvature and the nature will be real and inverted
Image will be of same size as of object
PLEASE HELP!!! GIVING BRAINLIEST!! ill also answer questions that you have posted if you answer this correctly!!!! (70pts)
Answer:
Rolling = Riding a bicycle on a sidewalk
Static = Pushing a car unsuccessfully
Sliding = Pulling your computer across the bed
Fluid = Throwing a soccer ball to your friend
Answer: Rolling = Riding a bicycle on a sidewalk
Static = Pushing a car unsuccessfully
Sliding = Pulling your computer across the bed
Fluid = Throwing a soccer ball to your friend
Explanation:
Please help I’ll give 15 points
Answer:
note duration are measured in beats
resistors - defibrillator - resistance - increases - energy - decreases -capacitors.
1_______________ is the difficulty of passing electric current through a conductor. It 2_______________ as the wire becomes longer and 3_________________ as the wire becomes wider.
4________________ are electric devices used to transform energy into heat or light.
5________________ are similar to batteries. They can store 6_______________. But they charge up quicker and can discharge the all the energy faster than a second. A 7_________________ is an example of a capacitor function.
Answer:
1. Resistance.
2. Decreases.
3. Increases.
4. Defibrillator.
5. Capacitors.
6. Energy.
7. Resistor.
Explanation:
Resistance is the difficulty of passing electric current through a conductor. It increases as the wire becomes longer and decreases as the wire becomes wider.
Defibrillator are electric devices used to transform energy into heat or light.
Capacitors are similar to batteries. They can store energy. But they charge up quicker and can discharge all the the energy faster than a second. A resistor is an example of a capacitor function.
caves are formed from?
Answer:
caves are mainly formed by water or in some other cases limestone.
Z. solid
Y molten
X. solid and liquid
W. solid, rocky
What is the name of the layer of the Earth that is labeled with the letter X?
OA
mantle
ОВ.
outer core
OC. inner core
OD. Crust
Answer:
mantle
Explanation:
The mantle has properties of solids only.
Which of the following elements is the most chemically reactive?
A.Iron
B.Fluorine
C.Boron
D.Argon
Answer:
B) Fluorine
Explanation:
The most reactive element is fluorine, the first element in the halogen group. The most reactive metal is francium, the last alkali metal (and most expensive element).