10. CALCULATE: Find the amount of power used in each of the following examples. Show your calculations. a. You use a force of 10 N to move a box 100 m in 10 seconds. b. An athlete lifting weights does 900 J of work in 1 second. C. A truck does 30,000 J of work in 15 seconds. d. A fumiture mover uses a force of 150 N to push a large trunk 5 m across the floor in 5 seconds
Answers
Answer:
please find attached pdf
Explanation:
Related Questions
PLS HELP WITH THIS DENSITY QUESTIONS AND WHEN SHOWING STEPS PLS USE GRASS
Calculate the density of aluminum if you have a piece of aluminum that has a volume of 48.9 cm³.When the piece is measured it is found to have a mass of 132 g.
A small amount of copper is found to have a mass of 27 g. Calculate the density of copper if the volume of the sample is 3.0 cm³.
The volume of a piece of iron is 65 cm³. If the piece of iron has a mass of 512 g. Calculate the density of the sample of iron.
A stick of cedar wood has a mass of 1.2 kg. It has a volume of 3243 cm³ . What is the density of cedar wood?
Zinc has a density of 7.14 g/cm³. If you are given 50 g of zinc calculate the volume of the sample.
A block of aluminum occupies a volume of 15.0 mL and weighs 40.5 g. What is its density?
Mercury metal is poured into a graduated cylinder that holds exactly 22.5 mL. The mercury used to fill the cylinder weighs 306.0 g. From this Information, calculate the density of mercury.
What volume of silver metal will weigh exactly 2500.0 g. The density of silver is 10.5 g/cm³
Answers
Answer:
Explanation:
Density = mass/volume
132g/(48.9 cm³) = 2.7 g/cm³
(27 g)/(3 cm³) = 9 g/cm³
512 g/(65 cm³) = 7.9 g/cm³
1.2 kg/(3243 cm³) cm³ = 1200 g/(3243 cm³) = 0.37 g/cm³
Displacement a combination of
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Answer:
Displacement a combination of distance
Explanation:
I'm not sure eh
Between steel and iron which is more suitable for making permanent magnets electromagnet and magnetic screen give reason for your answer
Answers
Answer:
steel is suitable for making permanent magnet
as still has hi factor coercity.
iron is for electromagnet and magnetic screen as iron loses its magnetism as soon as the switch is open and a current is switched off.
Steel is better suitable for making permanent magnets than soft iron since it has higher retentivity and lower coercivity. Compared to soft iron, steel has a lower retentivity and higher coercivity. Compared to soft iron, steel is more resilient and coercive.
What is retentivity and coercivity ?Retentivity : The ability to retain the generated magnetization in a magnetic material when the magnetizing force is removedCoercivity : A measure of the ability of a material to withstand an external magnetic field without becoming demagnetized.What is Permanent magnet and Electromagnet?Permanent magnet : To be suitable for permanent magnet, material should retain its magnetism for longer time, since steel have high retentivity and coercivity . Electromagnet : To be suitable for electromagnet , material should have magnetization and demagnetizing property .
Since , steels have high remanence which means it will remain magnetized even after magnetic field is removed which is not suitable for electromagnetic . iron has high permeability so magnetization is larger and have low retentivity so that material will not retain the magnetic properties . Magnetic screen , Iron has high permeability hence it can shield better than steel
To learn more about retentivity and coercivity
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Rewrite the following sentences choosing the right words given between the
| How many/much) (tiverivera) (ts/are) there in Lebanon?
How many/muen) (people/population) (live/lives) in the South
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Answer:
How muen population lives in the South
Answer:
How many people live in the South
I'm not sure about the first one sorry
Which pair of element types is most likely to share valence electrons in a
covalent bond?
A. Two metals
B. A metal and a nonmetal
C. Two nonmetals
D. A metal and a metalloid
Answers
Answer:
It's C, you guys!!!!
Explanation:
need help please and
Answers
please help me guys please please please please please please please please please please please please please
Answers
Answer:
1.F = 256 N
2.a = 8 m/s/s
By looking at the given information, you know force, and an acceleration. Therefore you have enough information to use the first formula.
F = ma
256 N = m * 8 m/s/s
m = 256 N/8 m/s/s
m = 32 Kg
2. a) A student obtained ice at 0°C from a refrigerator and placed it in a beaker on a
bench. After 4 minutes, the temperature rose to 4°C. State the changes that would be observed in the water in terms of;
(i) volume
(ii) mass
(iii) density
(b) Sketch a graph of density against temperature if the ice is warmed from 0°C to
8°C.
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Answer:
2 4
Explanation:
because
State the Law of Electric Charges in your own words.
Answers
[tex] \\ [/tex]
According to Coulomb, the electric force for charges at rest has the following properties: Like charges repel each other; unlike charges attract. Thus, two negative charges repel one another, while a positive charge attracts a negative charge. The attraction or repulsion acts along the line between the two charges.
Things that are negatively charged and things that are positively charged pull on (attract) each other. This makes electrons and protons stick together to form atoms. Things that have the same charge push each other away (they repel each other). This is called the Law of Charges.
[tex] \\ [/tex]
Hope It Helps!
The amount of matter in an object is mass or weight
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Answer:
mass
Explanation:
Consider the four masses. Describe the motion of the masses if you used THE SAME amount of force to move each one over THE
SAME time
A)
The greatest mass would not move at all.
B)
All four masses would move the same distance,
The lower the mass, the greater the distance the mass would move,
D)
The greater the mass, the greater the distance the mass would move,
Answers
Answer:
option c...................
if itis heavier, u have to push hardier or it to move the same distance.
1. If you were the organizer of this dance event, are you favor in moving the date on May? Why
or why not?
Answers
Answer:
I am in favor of the dance event being in may. Because it is nice weather outside, more people will decide to come and spend their time there. It is also light in the evening in may, meaning that you could have the dance event at any time, and younger people will still feel safe at night, meaning their parents will be more open to lwtting kids go.
Anita rides a bicycle to market 60km from her house in 3.5 hours. What is Anita’s
speed?
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60 divided by 3.5. The km divided by the hour gives the km per hour. Hope that helped :)
why do you think people translate sound waves from compression waves to transverse waves ?
Answers
Answer:
Sound waves are translated into transverse waves to know the frequency, amplitude, wavelength etc of the waves.
Explanation:
They translate the sound waves to know the depth about that specific waves and translating it to transverse waves makes it easier.
Hope it helps :D
what are the different benefit of walking?
Answers
Answer:
U can walk to the bathroom
Explanation:
The body weighing 8kg moves in a straight line uniformly accelerated with an acceleration of 3m / s? on a horizontal surface, under the action of force 60N.Find a) What is the friction force acting on the body) The coefficient of friction between the body and the surface where it moves
Answers
Answer:
the friction force f=36
and the coefficient of friction =0.45
The mass of water in the kettle is 0.50 kg. The specific heat capacity of water is 4200 J/kg °C. The initial temperature of the water is 100 °C. Calculate the average power output from the water in the kettle to the surroundings in 2 hours
Answers
Answer:
1.27 Mega watt approx
Explanation:
Given data
Mass= 0.5kg
c= 4200 J/kg °C
T1= 100°C
Time = 2 hours >>>> 7200 seconds
From the given data the water is already at the boiling point
Hence if continuous heat is being added the latent heat of vapourization will result, the latent heat of vaporization is about 2,260 kJ/kg
Q= mL
Q= 0.5*2,260
Q = 1130kJ
Power= Energy * Time
Power= 1130* 1130
Power= 1.27mega watt approx
A protein-digesting enzyme when mixed with starch solution would
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Answer:
It would produce fat..........
How do we know when an object is in static or dynamic equilibrium?
Answers
Answer:
First Condition of Equilibrium
Explanation:
This means that both the net force and the net torque on the object must be zero. The condition Fnet=0 F net = 0 must be true for both static equilibrium, where the object's velocity is zero, and dynamic equilibrium, where the object is moving at a constant velocity.The sum of the forces on it in each direction is zero. The sum of the torques on it in each direction is zero. Its linear momentum is zero.Explain why gaps are left between railway lines
Answers
Answer:
to prevent the derailing of the train due to thermal expansion.
Answer:
Iron are good conductors of heat and electricity. Being a good conductor it expands as well as contracts with the change of temperature.When heat is applied,they expands because molecules inside the element gets excited and number of molecules inside it increases in tremendous amount,so it leads to expansion of iron. So when the temperature is lowered it comes in its normal state.
The term for this is called as thermal expansion or contraction.The gap in the joint between 2 rails is to prevent from the expansion of the iron. It is necessary ,if not there will be change in structure,it may buckle and chance of derailed is increased.
Explanation:
The gap in the joint between to rails is to compensate for the expansion of the material of rail during summer.
The metals expand or contract with the changes in temperature. The expansion or contraction depends on the coefficient of thermal expansion of the material. Based on this property of the metal, the gap in the joint of two rails is provided.
In music, the note G above middle C has a frequency of about 392 hertz. If the speed of sound in the air is 340 m/s, what is the approximate wavelength of this note?(1 point)
1.2 meters
8.7 meters
0.87 meters
0.0026 meters
Answers
Answer:
0.87 meters
Explanation:
Explain the benefits of understanding sound waves properties in real life.
Answers
Answer:
The vibrations from sound waves cause our ears to send signals to our brains to create sound. The speed of sound waves will determine the sound's pitch, or how high or low something sounds. Sound waves are important because they allow us to hear important messages and emergency signals to protect ourselves.
Explanation:
I hope this helps :)
what is the shape of the path traversed by the earth around the sun?
Answers
The shape of the path transverse by the Earth around the sun is called an ellipse.
Answer:
The shape of the path transverse by the Earth around the sun is called an ellipse
Explanation:
:)
Weight is best described as
A) an object’s resistance to acceleration.
B) what causes an object to fall.
C) the downward force exerted on objects due to gravity.
D) a force solely dependent on an object’s mass.
Answers
Answer:
d
Explanation:
Answer:
d
Explanation
a force solely dependent on the object’s mass
If an object is placed between a convex lens and its focal point, which type of image will be produced?
A.
real, inverted, and magnified
B.
real, upright, and smaller
C.
virtual, inverted, and magnified
D.
virtual, upright, and magnified
E.
real, inverted, and smaller
Answers
Answer:
A
Explanation:
Beacuse it has 2 angles
Answer:
b I do believe sorry if I'm wrong
A scientist heats a red powder. Upon heating, a liquid and a gas form.
Which type of substance is the red powder?
O A. anion
B. an isotope
O c. an element
O D. a compound
Answers
Answer:
Compound
Explanation:
If it took Mrs. Coleman 1.4 s to go from the 10 m mark to the 15 m mark, what was Mrs. Coleman's average speed?
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Answer:
1m every 0.28 seconds
Explanation:
she travelled 5 m in 1.4 s, so divide it by itself, 1.4s divided by 5 m gets you 0.28s for 1m
1. What is the velocity of an 250-kg that has 6,250 J of energy?
Please help
Answers
Explanation:
KE = 1/2mv^2
6,250 J =1/2(250kg) v ^2
6250 J = 125kgv^2
125kg. 125kg
v =
[tex] \sqrt{50} [/tex]
Can someone help me answer this question what type of rock will form in this type of environment. Pls don’t guess and actually answer it
Answers
Answer:
Looks like A but I'm not sure.
Explanation:
dont take my word for it I might be wrong
Answer:
deforestación en el mundo es incontrolable
Example 4:
Find the index of refraction for diamond if the speed of light in diamond is 1.24 x 10m/s
Use the proper FORMAT
Answers
Answer:
Given speed of light in diamond =1.24*10m/s
speed of light (c) =3*10^8m/s
refractive index of diamond =3*10^8/1.24*10=2.41*10^7m/s