Answer:
Friction can be minimized by using lubricants like oil and grease and by using ball bearing between machine parts. A substance that is introduced between two surfaces in contact, to reduce friction, is called a lubricant. Fluid friction can be minimized by giving suitable shapes to the objects moving in the fluids.
Explanation:
hope it helps
An electric iron consumes energy at a rate of 840 W when heating is at the maximum rate and 360 W when the heating is at the minimum. The voltage is 220 V. What are the current and the resistance in each case?
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Answer:
At maximum the current is 4A and resistance is 55Ω
At minimum the current is 1.636A and resistance is 134.45Ω
Explanation:
The computation of the current and the resistance in each case is shown below:
At the time when it is heated at max rate,
power, P = 840W
V = 220V
As We know that
P = VI
840 = 220 × I
I = 840 ÷ 220
I = 4 A
Now
R = V ÷ I
= 220 ÷4
= 55 Ω
Hence, the current is 4A and resistance is 55Ω
At the time When it is heated at minimum rate,
power, P = 360W
V = 220V
As We know that
P = VI
360 = 220 × I
I = 360 ÷ 220
I = 1.636 A
Now
R = V÷ I
= 220 ÷1.636
= 134.45 Ω
Hence, the current is 1.636A and resistance is 134.45Ω
A hockey puck slides with a constant velocity across a frictionless ice surface. In one paragraph, using your own words, describe the net force on the hockey puck and the observation which allowed you to draw that conclusion.
Answer:
The net force on the hockey puck is zero because it's acceleration is zero due to constant velocity.
The hockey will remain in it's uniform motion unless compelled by an external force.
Explanation:
[tex]from \: vector \: mechanics \\ a = \frac{dv}{dt} \\ but \: at \: constant \: velocity \\ \frac{dv}{dt} = 0 \\ hence : \: \: a = \frac{0}{dt} \\ a = 0[/tex]
What is the galaxy that our solar system is located in?
Answer:
I think the answer is Milky Way
I hope this Will help you
given the atomic number,how would you know the number of protons?
The momentum of a car traveling in a straight line at 20 m/s is 24,500 kg•m/s. What is the cars mass?
Answer:
p=mv
p=given=24500kg-m/sec
m=?
v=20m/sec
m=p/v
=24500kg-m/sec÷20m/sec
=1225kg=ans
Answer:
1225kg=ans
Explanation:
Much of the United States electricity is produced by the use of coal. Starting with the energy radiating from the sun, and ending with the production of electricity, trace the many conversions of the energy involved. Within your response be sure to
• Include the key terms of mechanical, chemical, kinetic, and potential energy.
Answer:
Chemical energy to heat energy to kinetic energy to electrical energy
HURRY URGENT ASAP I WILL GIVE BRAINLIEST
What does mutate mean?
a)Change the DNA of your cells
b) Kill your DNA
c)Kill your cell
d)Change the cell
Answer:
A
Explanation:
What is the purpose of chloroplasts, and why do you think it is missing from the root hair cell?
Explanation:
Mitochondria are essential parts of many eukaryotes, but they are useless without oxygen. Therefore, chloroplasts are extremely important. They produce breathable air for life. Root hairs are seen to not have chloroplasts as their job is to collect water and nutrients.
BRAINILIEST PLEASEin prokaryotic and eukaryotic cells the amount of water in the cell is kept at a steady state. The organelles
through which water passes into and out of cell is the
A) cell membrane
B) cell wall
C) nuclear
D) ribosome
Answer:
A
Explanation:
It would not be C because prokaryotic cells don't have a nucleus. And if you're looking for a body in the cell that controls the nutrients and water it would be A.
Question 1
1 pts
What measures the amount of current flowing through a wire?
A.voltage
B. ampere
C. watt
ampere is the right answer.
can you please help me with this lab.
Answer: I really don’t know
Explanation:
Pls help meh Kdjdjeidjndiejdididjdjjdidjdjdiejd
Answer:
i think b
Explanation:
i'm not sure
Answer:
I think both pure substance and an element .
hope it is helpful to you ☺️☺️
please help me please
Answer #1:
Physical.
Explanation:
The only thing mentioned to change is the color. Nothing about the gas in general is changing
Answer #2:
Chemical.
Explanation:
The fact this interacted with another element to completely turn something else rather than just being that color makes this a chemical change.
Answer #3:
Physical
Explanation:
Well, how does an element's density have to do anything with a chemical change?
Answer #4:
Chemical.
Explanation:
Fire/heat is involved, and it makes it change states.
How fast must a person lift a barbell with a weight of 635 N to a height of 2.43 meters in order to have a power of 482 W
Answer:
Time = 3.2 seconds
Explanation:
Given the following data;
Weight = 635 N
Height, h = 2.43 m
Power = 482 Watts
To find the time;
Power = mgh/time
But weight = mg = 635
Substituting into the formula, we have;
482 = (635 * 2.43)/time
482 = 1543.05/time
Time = 1543.05/482
Time = 3.2 seconds
Which energy change is caused by an endothermic chemical reaction?
A. An increase in temperature
B. Absorption of thermal energy
C. Release of light
D. Production of thermal energy
The energy change caused by an endothermic chemical reaction is the absorption of thermal energy. So, option B.
What is meant by endothermic reaction ?Endothermic reactions are defined as, those reactions in which the reactants take in heat energy from the environment to create products.
Here,
The endothermic reactions lower the temperature of their surrounding area, thereby creating a cooling effect.
When bonds in the reactants are broken, more energy is absorbed than is released when new bonds are generated in the products. This is known as an endothermic reaction.
A drop in the temperature of the reaction mixture is a characteristic of endothermic reactions.
In endothermic reactions, the enthalpy of the products of the reaction is greater than that of the reactants. Energy is absorbed from the surroundings.
Hence,
The energy change caused by an endothermic chemical reaction is the absorption of thermal energy.
To learn more about endothermic reactions, click:
https://brainly.com/question/23184814
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CAN PEOPLE PLEASE HELP, I NEED TO GET TO THE NEXT LEVEL OR WHATEVER ITS CALLED BUT I NEED 5 BRAINLIEST IN 2 DAYS, I ALREADY HAVE 7 BUT THAT DOSENT COUNT IG, IF YOU HELP ILL RETURN THE FAVOR AND GIVE YOU BRAINLIEST ON YOUR AWENSERS OR QUESTIONS........ ILL AWENSER ONE OF YOUR QUESTIONS AND YOU MAKE ME BRAINLIEST? THXX
Answer:
answer the question i have asked go to my account
Explanation:
can i get brainliest
Answer:
yes you can go on your account
A block is attached to the end of a horizontal ideal spring and rests on a frictionless surface. The block is pulled so that the spring stretches relative to its unstrained length. In each of the following three cases, the spring is stretched initially by the same amount. Rank the amplitudes of the resulting simple harmonic motion in decreasing order (largest first). (a) The block is released from rest. (b) The block is given an initial speed . (c) The block is given an initial speed .
Answer:
The answer is "a, c and b"
Explanation:
Its total block power is equal to the amount of potential energy and kinetic energy.Because the original block expansion in all situations will be the same, its potential power in all cases is the same.Because the block in the first case has no initial speed, the block has zero film energy.For both the second example, it also has the [tex]v_o[/tex] velocity, but the kinetic energy is higher among the three because its potential and kinetic energy are higher.While over the last case the kinetic speed is greater and lower than in the first case, the total energy is also higher than the first lower than that of the second.The greater the amplitude was its greater the total energy, therefore lower the second, during the first case the higher the amplitude.Which of the following is the combination that is used in the formation of achromatic lenses?
1 point
1 convex and 1 plane mirror
2 convex lenses
1 convex and 1 concave lens
2 concave lenses
Answer:
convex and 1 plane mirror
Suppose a new element with atomic number 120 is discovered.If some isotopes of this element have 122 neutrons and some have 124 neutrons,what can you infer about the atomic mass of the element?Explain you answer.
Answer:
I assume you are referring to the standard atomic weight of the elements when you write atomic mass. No elements beyond uranium has a standard atomic weight. The reason is explained by the organization assigned responsibility for the assignment of standard atomic weights,the international Union of Pure and Applied Chemistry commission on isotopic abundances and atomic weights.
A force is used to lift mass to a height of 8 m does 1040 J of work. How much force is used?
Answer:
[tex]\boxed {\boxed {\sf 130 \ Newtons }}[/tex]
Explanation:
Work is the energy transferred to or from an object when force is applied to cause displacement. It is the product of force and displacement.
[tex]W=F*s[/tex]
The displacement (s) is 8 meters and the work (W) is 1,040 Joules. Substitute these values into the formula.
[tex]1040 \ J= F* 8 \ m[/tex]
First, let's convert the units. This will make the question easier later on. 1 Joule is equal to 1 Newton meter, so the 1040 J of work equal 1040 N*m.
[tex]1040 \ N*m= F * 8 \ m[/tex]
Since we are solving for the force (F), we must isolate the variable. It is being multiplied by 8 meters and the inverse of multiplication is division. Divide both sides by 8 m.
[tex]\frac {1040 \ N*m}{8 \ m}= \frac{F * 8 \ m}{8 \ m}[/tex]
[tex]\frac {1040 \ N*m}{8 \ m}=F[/tex]
The meters cancel out, hence our earlier unit conversion.
[tex]130 \ N = F[/tex]
A force of 130 Newtons is used.
1.El diámetro del Universo visible es 8,8 x10^26 m El volumen del Universo visible se calcula usando 4/3 Pi radio^3. La densidad del universo visible es 9.9 x 10^-27 Kg/m^3 Calcule la cantidad de materia que hay en el Universo. Use la fórmula Densidad x Volumen = Masa Exprese su respuesta en Kg 2.La masa del sol es 2x10^30 Kg. ¿Cuántas masas solares se necesitan para completar la masa total del universo visible? Exprese su respuesta en gramos
Answer:
1. La cantidad de materia que hay en el Universo es 3,53x10⁵⁴ kg.
2. Se necesitan 1,8x10²⁴ masas solares para completar la masa total del Universo visible.
Explanation:
1. La cantidad de materia del Universo se puede calcular a través de su volumen (V) y de su densidad (d):
[tex] d = \frac{m_{u}}{V} = \frac{m}{\frac{4}{3}\pi r^{3}} [/tex]
En donde:
r: es el radio = d/2 = 8,8x10²⁶/2 m = 4,4x10²⁶ m
[tex]m_{u}[/tex]: es la masa del Universo =?
d: es la densidad = 9,9x10⁻²⁷ kg/m³
[tex]m_{u} = d*v = 9,9 \cdot 10^{-27} kg/m^{3}*\frac{4}{3}\pi (4,4 \cdot 10^{26} m)^{3} = 3,53 \cdot 10^{54} kg[/tex]
Entonces, la cantidad de materia que hay en el Universo es 3,53x10⁵⁴ kg.
2. La masa del sol es 2x10³⁰ kg, por lo que para completar la masa total del Universo visible se necesitan las siguientes masas solares:
[tex]N = \frac{m_{u}}{m_{s}} = \frac{3,53 \cdot 10^{54} kg}{2\cdot 10^{30} kg} = 1,8 \cdot 10^{24}[/tex]
Por lo tanto, se necesitan 1,8x10²⁴ masas solares para completar la masa total del Universo visible.
Espero que te sea de utilidad!
How many volts flow through a current if it has 550 amps and 50,000 watts
Please help!!!!! This is for science and I don’t understand
Answer:
the correct one is B
Explanation:
In this exercise, indicate that crocodiles need a warm climate to survive.
The current climate in the western Colorado region where the temperature is 53ºF (11.7ºC) does not allow them to survive, therefore the appearance of fossil crocodiles and fossil subtropical plants and a clear indication that the climate in these regions was much more warm
when checking the answers the correct one is B
14. Earth goes around the sun at an astonishing speed of about -hold your breath-107 460 643 meters per second. *
1 point
True
False
15. A car is moving around an oval track at a constant speed of 20km/h. Is it accelerating? *
1 point
True
False
Answer: 14 speed of Earth around Sun I see 30 km/s. FALSE
15. Because car is in circle track, direction of velocity changes
And car is in accelerating motion. direction of acceleration points to
The centre of the circle. RIGHT
Explanation:
a measuring cylinder contains water when put rock level rises what is volume of rock
Answer:
The volume displacement resulting from the action, minus the original volume.
the moon doesn't fall to earth because of it's friction?
Answer:
The Moon does not fall towards Earth right now because Earth rotates itself. The energy from the Earth's own rotation around its axis is gradually tranferred into energy of the Moon's orbital motion. That's why the Earth's rotating speed decreases but the distance to the Moon increases.
Answer:
I think No since the gravitational force of earth is not eneogh to pull moon to it
A type of organism that makes its own food. __________
The highest taxonomic classification of organisms.__________
The process through which organisms make new organisms of the same kind. _______
The taxonomic classification below domains._________
A type of organism that is made of more than one cell and is more specialized and eukaryotic.__________
A characteristic passed from female and male parents to their offspring.________
FILL IN THE BLANKS PLEASEEE WILL GIVE BRAINLIEST AND 50 POINTS
Answer:
1. An autotroph
2. Domain
3. Reproduction
4. Kingdom
5. Multicellular Organism
6. Genetic trait
Explanation: Took Bio honors 1 & 2
A researcher is trying to identify whether household substances are basic. Which approach would BEST help the researcher
investigate whether substances are basic?
A. Test each substance with red litmus paper.
B. Test each substance with blue litmus paper.
C. Observe each substance and record its color.
D. Mix each substance with a weak base and record the results.
Answer:
a
Explanation:
because red litmus paper turn blues under base or alkaline condition
where is the center of the universe located? and any 16 or older guys on here who are down to talk?? i got a pad we can talk on :) (i'm 17)
Answer:
the center of the universe is in your mom's stomach. why do I keep seeing people wanting to look for a date. the f. u. c. k.?
A car travels in 300 km in 3 hours. What can be determined?
Answer: If a car travels 300 km in 3 hours, then it’s speed will will be 100 km/hr. But in practical it depends upon type of car, condition of car, car's maximum speed and also the path in which car is travelling.. Because car can't travel in constant speed of 100 km/hr. So, if car have 120 km/hr as maximum speed than it's minimum speed will be 85–95 km/hr. And so the car travel 300 km in around 5 or 5 and half hours.