hydrogen
Explanation:
Selenium is an element whose trace amounts are essential for life, as proven in 1979 based on its cumulative function with vitamin E [23]. Increasing deficiency of selenium in different parts of the world leads to the occurrence of many pathological disorders
A ball rolls from point A to point B. The total energy of the ball at point A isn’t the same as the sum of its potential energy and kinetic energy at point B. Which statement best explains this situation?
The rolling ball doesn’t follow the law of conservation of energy.
Some of the ball’s energy is transformed to thermal energy.
The rolling ball loses some of its energy because of gravity.
The ball absorbs some of its own potential energy.
Answer:
option b
Explanation:
because the law of conservation
it means that energy can never created nor be destroyed
even it will change into another form if energy
Answer: B
Explanation:
What is the acceleration of an object that goes from 45m/s to 10 m/s in 5 seconds?
Answer:
[tex]\boxed {\boxed {\sf a= -7 \ m/s^2}}[/tex]
Explanation:
Acceleration is the change in velocity over time.
[tex]a= \frac {v_f-v_i}{t}[/tex]
The object accelerates from 45 meters per second to 10 meters per second in 5 seconds. Therefore,
[tex]v_f=10 \ m/s \\v_i= 45 \ m/s \\t= 5 \ s[/tex]
Substitute the values into the formula.
[tex]a= \frac{ 10 \ m/s - 45 \ m/s}{5 \ s}[/tex]
Solve the numerator.
[tex]a= \frac { -35 \ m/s}{5 \ s}[/tex]
Divide.
[tex]a= -7 \ m/s/s[/tex]
[tex]a= -7 \ m/s^2[/tex]
The acceleration of the object is -7 meters per square second. The acceleration is negative because the object's velocity decreases and the object slows down.
Hi people; there's a question that has been so confusing for me and a friend of mine.
0°C + 0°C = 64°F
Is this correct or wrong?
Answer:
The correct answer is: 0°C + 0°C = 32°F
Explanation:
We need to remember the conversion equation from Celsius to Fahrenheit:
[tex]y^{\circ}F=(x^{\circ}C * \frac{9}{5})+32[/tex]
In our case x = 0, then y will be:
[tex](0^{\circ}C * \frac{9}{5})+32=32[/tex]
[tex]y=32^{\circ}F[/tex]
Now 0°C + 0°C is just 0°C because if we add a body at a certain temperature to another body with the same temperature the total temperature will the same.
Then, knowing that 0°C = 32°F we can conclude that:
[tex]0^{\circ}C+0^{\circ}C=32^{\circ}F[/tex]
I hope it helps you!
I don't understand how to do this?
ILL MARK BRAINLIEST
PLEASE HELP
2.Write the formula associating energy with power
Answer:
The formula for potential energy depends on the force acting on the two objects. For the gravitational force the formula is P.E. = mgh, where m is the mass in kilograms, g is the acceleration due to gravity (9.8 m / s2 at the surface of the earth) and h is the height in meters.
Explanation:
Sub to Beast_Building on yt
Oliver builds a circuit connecting a light bulb to a battery with wires, leaving a gap in one of the wires. He places several objects across the gap to close the loop. He wants to see which objects allow electricity to flow and turn on the light bulb. Why do some materials allow electricity to flow through while others do not?
A-Electricity will flow if the atoms in the material are bound tightly to each other.
B-Electricity will flow if the atoms in the material are bound loosely to each other.
C-Electricity will flow if the electrons are bound tightly to their atoms in the material.
D-Electricity will flow if the electrons are bound loosely to their atoms in the material.
Answer:
C-Electricity will flow if the electrons are bound tightly to their atoms in the material.
Explanation:
The flow of electricity through a material is determined by the condition of the electron which make of the atoms of the material. For example, in iron metal, the electron of the material is bounds tightly to their atoms. Do to this reason, the electricity can flow freely inside them unlike the plastic material which has no tightly bound electrons.
A satellite orbits around a planet with a mass of 3.0x10^23kg . If the satellite is 3.0x10^8m from the planet's center, what is the velocity of the satellite as it orbits in a circle around the planet?
Answer:
dyffuosuzfuufoxuusouuofdofusuddsudzufuxfusfdfdfudfuodruodoodoyudfoudoduofuodoufdfoyfyoffyoyofufyfo
Richard Julius once made a model plane that could travel a max speed of 110 m/s. Suppose the plane was held in a circular path by a control line. Suppose the plane ran out of gas while moving at its maximum speed and Richard Julius pulled the line in to bring the plane home while it continued in a circular path. If the line's initial length is 120 m and Richard Julius shortened the line by 0.80 m every second, what was the plane's speed after 33.0 s?
Answer:
85.8 m/s
Explanation:
We know that the length of the circular path, L the plane travels is
L = rθ where r = radius of path and θ = angle covered
Now,its speed , v = dL/dt = drθ/dt = rdθ/dt + θdr/dt
where dθ/dt = ω = angular speed = v'/r where v' = maximum speed of plane and r = radius of circular path
Now, from θ = θ₀ + ωt where θ₀ = 0 rad, ω = angular speed and t = time,
θ = θ₀ + ωt = 0 + ωt = ωt
So, v = rdθ/dt + θdr/dt
v = rω + ωtdr/dt
v = (r + tdr/dt)ω
v = (r + tdr/dt)v'/r
v = v' + tv'/r(dr/dt)
v = v'[1 + t(dr/dt)/r]
Given that v' = 110 m/s, t = 33.0s, r = 120 m and dr/dt = rate at which line is shortened = -0.80 m/s (negative since it is decreasing)
So, v = 110 m/s[1 + 33.0 s(-0.80 m/s)/120 m]
v = 110 m/s[1 + 11.0 s(-0.80 m/s)/40 m]
v = 110 m/s[1 + 11.0 s(-0.02/s)]
v = 110 m/s[1 - 0.22]
v = 110 m/s(0.78)
v = 85.8 m/s
Which of the following would have the most momentum?
A. A train traveling 60 miles per hour.
B. A motorcycle traveling 60 miles per hour.
C. A car traveling at 60 miles per hour.
D. A basketball traveling 60 miles per hour.
Answer:
A. A train traveling 60 miles per hour.
Explanation:
Momentum can be defined as the multiplication (product) of the mass possessed by an object and its velocity. Momentum is considered to be a vector quantity because it has both magnitude and direction.
Mathematically, momentum is given by the formula;
[tex] Momentum = mass * velocity [/tex]
This ultimately implies that, the mass of an object or body is directly proportional to its momentum. Thus, the higher the mass of an object or body, the greater would be its momentum and vice-versa.
Hence, a train traveling 60 miles per hour would have the most momentum because it has the greatest mass among the other objects (options).
Question 5
Joan wants to decrease her BMI number. How can she achieve her goal?
A. Joan can lose some weight
B. Joan can stretch and get taller
C. Joan can have her blood pressure checked.
D. Joan can take medication
Suppose you stand on the rim of a space station. If the radius of the station is 12,000
meters, at what tangential speed must the rim of the station move in order for you to have the same weight as on the Earth?
[HINT: F=mv2/r = mg]
Answer:
circle
Explanation:
because Earth is not oblong
14. Which of the following ideas is NOT a part of cell theory?
A. There are only plant and animal cells
B. All living things contain at least one cell
C. Cells come from other cells of the same kind
D. Cells are the basic unit of structure and function of living things
Cell theory states that all living things contain at least one cell, and there are certainly more types of living things than simply plants and animals. For example bacteria and fungi.
So your answer would be A.
Answer: C
Explanation:
all the other ones are part of the cell theory
A boat trip travels are 15 miles in the direction of 45° east of north for an hour the boat then turn and travels at 18 m/s in a direction 5° north of East for an hour
Answer:
Hello your question is incomplete below is the missing piece
What is the magnitude of the boat’s resultant velocity? Round your answer to the nearest whole number.
answer : 25.73 m/s
Explanation:
Given
V1 = 15 miles/hour = 6.71 m/s [ 45° EN ]
V2 = 18 m/s [ 5° NE ]
Calculate the resultant velocity
Vr = 6.71 m/s[45°] + 18m/s[5°].
Vr = ( 6.71 *Cos45° + 6.71 *sin45°) + ( 18 *Cos5° + 18*sin5° )
Vr = ( 4.74 + 4.74 i )+ ( 17.93 + 1.57i) = 22.67 + 12.18i.
Therefore the magnitude
= [tex]\sqrt{22.67^2 + 12.18^2}[/tex] = 25.73 m/s
True or false question scientists can predict when an earthquake will occur
Answer:
False
Explanation:
Neither the USGS nor any other scientists have ever predicted a major earthquake. USGS scientists can only calculate the probability that a significant earthquake will occur in a specific area within a certain number of years.
brick falls from a height of 10 m. Calculate the time taken for the brick to reach the ground.
Use physics kinematic equations to solve for t. Lookup physics kinematic problems on Kahn for more understanding.
You wake up in the morning and get out of bed. Does the floor feel cold or warm on your bare feet? On the lines below, write a sentence that compares how it feels to step on a bare floor and on a rug on a cold morning
When you get out of bed in a morning it's most likely too be cold so your bare feet on a floor not carpet a bare floor will feel cold since the temperature and molecules had changed and if you step on a warm fuzzy rug it will feel warm since your feet are cold and the rugs fuzziness or material keeps you warn
We feel more cold on feet on morning because heat from our feet will flow to the cold floor. We feel more cold on the bare floor than the rug since it conducts heat away from our feet.
What is heat transfer?Heat will be transfer on a temperature gradient from one substance to the other. Heat is transferring from the hot body to the colder body. There are three types of heat transfer are there namely, conduction, convection and radiation.
Conduction is the heat transfer in solids , convection in liquids and radiation is the heat or energy transfer mode in gases and vacuum. At the morning, the floor will be more cool whereas our body will be hotter, thus heat will flow our body to floor make our feet cool.
A bare floor will conduct thermally more than a rug do. Thus the bare floor conducts heat away from our feet and make our feet more cool.
To find more on heat transfer, refer here:
https://brainly.com/question/13433948
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How did the police catch the Golden State Killer?
Answer:
lhf
Explanation:
.
Tonks changes her hair color for a party with a red color rinse. The next day, she washes the color out of her hair and it returns to its original brown color. Has a chemical change occurred? Explain your answer.
Answer: No , a chemical change has not occured as it was easily reversed.
Explanation:
Chemical change is defined as a change in which rearrangement of atoms take place and leads to formation of new substances. It can only be reversed with the help of a chemical reaction.
Physical change is defined as a change which leads to change in shape, size or state of the substance changes. No new substance is formed.It can be easily reversed.
As the hair colour was washed out and returned to its original brown colour, it was a physical change.
Alondra applies 24 N of force to the end of a stick (a type of lever) to open a can of paint.
The lid resists with 6 N of force. What is the mechanical advantage?
Answer:
1/4
Explanation:
Mechanical Advantage = Load/Effort
Given
Effort applied = 24N
Load = 6N
Substitute
MA = 6/24
MA = 1/4
Hence the mechanical advantage is 1/4
Answer:
4
Explanation:
24n/6n=4
HELPPP!!!! I'LL GIVE BRAINLIEST TO THE CORRECT ANSWER!!
Which uses direct current?
A) A toaster oven thingy (look at pic)
B) A flashlight (look at pic)
C) A microwave (look at pic)
D) A vacuum (look at pic)
Answer:
Which uses direct current - A flash light.
Explanation:
Hope you have a great day.
What do the three variables (f,m, a) in the equation mean?
Answer:
f=force m=mass and a=acceleration
Can someone helpppp plsssss
(this is on motion graphs)
Answer:
Only at point a
Explanation:
If the velocity is greater than zero, than the object must be moving.
A wire has compasses placed around it and a current is passed through the wire. What happens to the compasses
Answer:
If you hold a compass near a wire through which current is flowing, the needle on the compass will be deflected. Since compasses work by pointing along magnetic field lines, this means that there must be a magnetic field near the wire through which the current is flowing
Explanation:
good luck
. The average human walks at a speed of 5 km per hour. If your PE teacher asks you to walk for 30 minutes in
gym class, how far would you walk (km)?
Answer: 2.5 km
Explanation:
5/2 = 2.5 km
60/2 = 30 mins
Answer all of those questions and you will get the brainiest
Answers:
1) A process that occurs when an object or a particle moves, referred to as kinetic energy
2) A potential energy is a stored amount of energy that changes depending on the relative positions.
3) Potential Energy is the energy stored in an object due to its position. Kinetic Energy is the energy of motion in a moving object.
4)
a) C and B
b) A
c) From B to A or from C to A
d) From A to B or from A to C
[tex]\huge\mathfrak\green{answer}[/tex]
1) Kinetic energy of an object is the measure of the work an object can do by the virtue of its motion.
For Example : A river flowing at a certain speed comprises kinetic energy as water has certain velocity and mass.
2) Potential energy is the energy held by an object because of its position relative to other objects, stresses within itself, its electric charge, or other factors.
For Example : A child at the top of the slide
3) KINETIC ENERGY
Kinetic energy is the kind of energy present in a body due to the property of its motionIt can be easily transferred from one body to anotherIt is relative with respect to natureFlowing water is one of the examples of kinetic energyPOTENTIAL ENERGY
Potential Energy is the type of energy present in a body due to the property of its stateIt is not transferableIt is non-relative with respect to natureWater present at the top of a hill is an example of potential energy(make sure to draw a table and write them separately)
4)
a) C and B
b) A
c) B to A then C to A
d) A to B then A to C
(mark me brainliest please I need 1 more :))
[tex]\large\sf\green{thank \: you}[/tex]
He likes to eat (into passive voice)
Answer:
yes he does
Explanation:
A measure of the average kinetic energy per particle in a quantity of matter
Question 4 of 10
Which two options are reasons that electromagnetic waves are effective for
use in communication devices?
A. The entire electromagnetic spectrum can be used.
B. They can travel through matter and through space.
C. Both gamma rays and X-rays can be used.
D. They can carry information for long distances without wires.
They can travel through matter and through space.
What is Electromagnetic waves?Electromagnetic radiation is one of the many ways that energy travels through space. The heat from a burning fire, the light from the sun, the X-rays used by your doctor, as well as the energy used to cook food in a microwave are all forms of electromagnetic radiation.
While these forms of energy might seem quite different from one another, they are related in that they all exhibit wavelike properties.
The electromagnetic spectrum is a taxonomy of electromagnetic waves that groups them according to their varied wavelengths and frequencies.
Therefore, They can travel through matter and through space.
To learn more about Electromagnetic waves, refer to the link:
https://brainly.com/question/18165320
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What is a soundwave please quick
In physics, sound is a vibration that propagates as an acoustic wave, through a transmission medium such as a gas, liquid or solid. In human physiology and psychology, sound is the reception of such waves and their perception by the brain.
a wall is painted yellow with yellow paint. explain why the paint makes the wall look yellow