Answer:
read the explanation
Explanation:
Purchased electricity is fed into our TVs and is converted to light and sound.
Electricity goes into an electric bulb and is converted to visible light and heat energy.
Chemical Energy is converted to Electrical Energy (stove)
Chemical food energy is converted to Energy to Work (person running).
Answer:
Gasoline/chemical is put into our cars, and with the help of electrical energy from a battery, provides mechanical energy/ kinetic energy
red is sus
Physics , help please
A computer is on a desk. The normal force pushing up on the computer is 17 N and the weight is 17 N down. Find the net force.
When A computer is on a desk The normal force pushing up on the computer is 17 N and the weight is 17 N down then the Net force is 0 N
What is Balanced and Unbalance forces ?Motion of the object is because of Force exerted on it. Balanced forces are those forces which are opposite in direction and equal in magnitude. When resultant force acting on a body is zero then it is called as balanced force. motion of the body is not because of Balanced force. ex. when two persons pulling rope on both end with equal magnitude which cause them to be balanced force have 0 net force.
When resultant of all the forces is not equal to zero then we call it as Unbalanced forces. unbalanced force are responsible for the motion of the body.
Given,
Normal Force in upward direction = 17N
weight mg in downward direction = 17N
in this case both forces are in opposite direction. one is on positive y direction and other one is in negative y direction. Therefore net force acting on the computer desk is given by,
[tex]F^{2} _{net} = F^{2} _{1} + F^{2} _{2} + 2F _{1}F _{2}cos\alpha[/tex].....1
where [tex]\alpha[/tex] = angle between two forces.
[tex]\alpha[/tex] = 180 [tex]cos\alpha[/tex] = -1
[tex]F_{1} = F_{2}[/tex] , 17N =17N
With this equation 1 becomes
[tex]F^{2} _{net}[/tex] = 2F₁²-2F₁² = 0N
Hence net force is 0 N. This is a balanced force.
To know more about Force, Click :
https://brainly.com/question/26115859
#SPJ2.
a driver brings a car to a full stop in 2.0 s. if the car was initially traveling at 22 m/s, what is the acceleration?
Answer:-11m/s^2
Explanation:
A boulder rolls off a 100 meter cliff with a horizontal velocity of 2 m/s.
Make a sketch of the cliff and the boulder. Be sure to label the height of the cliff, the horizontal velocty of the
boulder, and the trajectory of the boulder
Explanation:
It is given that,
Height of the cliff is 100 m
Its horizontal velocity is 2 m/s
The attached figure shows the sketch of the cliff and the boulder. It will go in the form of parabola. Its trajectory is parabolic in nature. The horizontal distance is called the range of the parabola.
everything in the universe is made up of what A.atoms B.minerals C.nitrogen
Answer: A) Atoms.
Explanation:
Answer:
a atoms
Explanation:
If a 60-g object has a volume of 30 cm", what is its density?
Answer:
Density = Mass/volume. D= 60/30.Divide it and you'll get ur answer as 2
If the Moon revolves around the Earth in a circular orbit with a period of 27 days, 7 hours, and 43 minutes, and astronomers have clocked it's orbital speed at 1.03 km/s, what is the centripetal acceleration of the Moon due to its orbit around the Earth?
Answer:
T = (27 da * 24 hr/da + 7 hr + 43 min/60 min/hr) * 3600 sec/hr = 2.36 * 10E6 sec period of moon in sec
C = v t = 2 pi R circumference of orbit where v is orbital speed
ac (centripetal acceleration) = v^2 / R = v^2 / (v t / 2 pi) = 2 pi v / t
ac = 2 pi * 1.03 * 10E3 m/s / 2.36 * 10E6 sec = 2.74 * 10E-3 m /s^2
A sailfish swims 120 km/hr. How far will it travel in 8.0 minutes?
Answer:
16km
Explanation:
First change the minutes into hours then multiply by the distance.
(8÷60)×120=16km
When energy is transformed, some is used, but most is released as unusable heat energy, according to the law of thermodynamics.
HELP PLEASE ASAP
A can of tuna, starting from rest, is dropped off a building. If it is only being pulled down by gravity (-
9.8 m/s2) and it hits the ground 3.2s later, how far (Ax) did it drop?
Answer: (displacement/delta x) = -50. m, and distance dropped = 50. m (50. m below the starting location)
Explanation:
We know that the initial velocity of the tuna can is 0 m/s, as it is at rest. Also, we have the acceleration caused by gravity (-9.8 m/s^2). The time for the trip is 3.2 s. We need to find the displacement, or delta x.
To do this, we need to use a freefall equation. The one we can use with initial velocity, time, and acceleration would be the following:
d = (initial velocity)(time) + (1/2)(acceleration caused by gravity)(time)^2
d = (vi)(t) + 1/2(g)(t)^2
d = (0 m/s)(3.2 s) + 1/2(-9.8 m/s^2)(3.2 s)^2
d = 1/2(-9.8 m/s^2)(3.2 s)^2
d = -4.9(3.2)^2
d = -4.9(10.24)
d = -50.176 = -50. m
A) What is the position of the Earth when the Sun rises to its lowest Midday position in the sky in the Northern Hemisphere? b )What is the position of the Earth when the Sun rises to its lowest Midday position in the sky in the southern Hemisphere?
Answer:
A) In northern hemisphere, position of the earth is towards to the sun.
B) In Southern hemisphere, position is away from the sun.
Explanation:
A) In the month of June in the northern hemisphere, the axis of the earth is usually tilted at an angle of about 23.5°. During this period, it revolves around round the sun with one complete revolution of 365 days. Now for the duration of this rotation, the position of the earth is that it leans into the sun when the Sun rises to its lowest Midday position in the sky .
B) For the southern hemisphere, it undergoes the same rotation as in the northern hemisphere. Just that it is usually in the month of December and the position of the earth is that it leans away from the sun when the Sun rises to its lowest Midday position in the sky .
7. Two bikes travelling in the same direction move at a speed of 30 km/hr. The bikes are separated by a distance of 5 km. What would the speed of the car travelling in the opposite direction be if it meets these bikes at an interval of 4 minutes?
Answer:
Explanation:
Call the bike on the right A
Call the bike on the left B
The car begins it's time when it passes A
4 minutes later, it passes B.
But B has moved in 4 minutes and that is the key to the problem.
How far has B moved.
t = 4 minutes = 4/60 hours = 1/15 of an hour.
d = ?
rate = 30 km / hr
d = r * t
d = 30 km/hr * 1/15 hours = 2 km
The distance between the bikes is 5 km.
So the car has traveled 5 - 2 = 3 km
d = 3 km
r = ?
t = 4 minutes = 1/15 hour
r = d/t = 3/(1/15)= 3 / 0.066666666 = 45 km/hr.
In a standard gas grill propane tank, there is approximately 4,579 mL of propane (C3H8). At a temperature of 55˚C, the tank has a pressure of 1,798 kPa. The tank is cooled to 25˚C and the pressure reduced to 1,025 kPa. What will the new volume be?
Answer:
7300 mL
Explanation:
The question is a bit misleading, since tanks generally have a constant volume. But anyway, using ideal gas law:
PV = nRT
If amount of gas (n) is constant, then:
PV / T = constant
P₁V₁ / T₁ = P₂V₂ / T₂
(1798 kPa) (4579 mL) / (55 + 273) K = (1025 kPa) V / (25 + 273) K
V = 7298 mL
Rounded to two significant figures, the volume is 7300 mL.
Look at pic attached
Answer:
d=75 m
Explanation:
The horizontal launching speed is, v = 30 m/s
The vertical distance above the ground is= h m
The time of flight t= 2.5 s
The formula for free fall to apply here is:
h=1/2 *g * t² where g is acceleration due to gravity = -9.8 m/s² and t=2.5 s
Finding h, as ;
h= 1/2 * -9.8 * 2.5² = 30.63 m
Applying the formula for range (distance d)
R= v * t
R= 30 *2.5 =75 m
The range is 75 meters.
PLEASE HELPPP MEEEE!!!!!
Which of the following statments are true?
a
an object’s average velocity and average speed will not always be the same
b
If the object changes direction, then the distance traveled and the displacement will be different
c
If these two values are different, then speed and velocity will also differ.
d
none of the above
Answer:
A, B, C
Explanation:
PLEASE HELP IM UNSURE OF WHAT THE ANSWER IS
Answer:
The horizontal forces (Cols 2 & 3) balance for W and Y.
The vertical forces (Cols 1 & 4) also balance for W and Y.
This is not true for either X (unbalanced horizontal forces) or
Z (also unbalnced horizontal forces)
A dog chasing a cat has 0.55 times the kinetic energy of the cat, which has 0.45 times the weight of the dog. The dog speeds up by 0.91 m/s and then has the same kinetic energy as the cat. What was the original difference in speed of the dog and cat? In other words, what is v_sub_cat - v_sub_dog initially (before the dog speeds up)?
Answer:
The difference in speed of the dog and cat is 2.65 m/s
Explanation:
Given that,
Mass of cat = 0.45 times the mass of dog
K.E of dog = 0.55 times K.E of cat
We need to calculate the velocity of dog
Using given data
[tex]\dfrac{1}{2}m_{d}v_{d}^2=0.55\times\dfrac{1}{2}m_{c}v_{c}^2[/tex]
[tex]m_{d}v_{d}^2=0.55\times0.45\times m_{d}\times v_{c}^2[/tex]
[tex]v_{d}^2=0.2475\times v_{c}^2[/tex]
[tex]v_{d}=0.497v_{c}[/tex]....(I)
The dog speeds up by 0.91 m/s and then has the same kinetic energy as the cat.
We need to calculate the velocity of dog
Using conservation of kinetic energy,
[tex]\dfrac{1}{2}m_{d}v_{d}^2=\dfrac{1}{2}m_{c}v_{c}^2[/tex]
[tex]\dfrac{1}{2}m_{d}(v_{d}+0.91)^2=\dfrac{1}{2}m_{c}v_{c}^2[/tex]
[tex]m_{d}(v_{d}+0.91)^2=0.45m_{d}v_{c}^2[/tex]
[tex]v_{d}+0.91=0.67v_{c}[/tex]
[tex]v_{d}=0.67v_{c}-0.91[/tex]...(II)
From equation (I) and (II)
[tex]0.497v_{c}=0.67v_{c}-0.91[/tex]
[tex]v_{c}=\dfrac{-0.91}{(0.497-0.67)}[/tex]
[tex]v_{c}=5.26\ m/s[/tex]
Put the value in equation (I)
[tex]v_{d}=0.497\times5.26[/tex]
[tex]v_{d}=2.61\ m/s[/tex]
We need to calculate the difference in speed of the dog and cat
Using speed of dog and cat
[tex]v_{c}-v_{d}=5.26-2.61[/tex]
[tex]v_{c}-v_{d}=2.65\ m/s[/tex]
Hence, The difference in speed of the dog and cat is 2.65 m/s
1. What were the 3 basic concepts of government that the English brought with them to North America?
How did these concepts influence constitutional government in America?
Answer:
1)limited system of government
2)representative system of government
3)individual rights system of government
Explanation:
the 3 basic concepts of government that the English brought with them to North America are listed in the answer
What does it mean to say that mass is conserved during a physical change?
Answer:
Alright, so mass is a property of a physical body. During physical changes, such as acceleration, force, etc, the mass stays the same since we are not affecting its physical shape, just where it is physics wise. So yeah mass is conserved during a physical change.
Explanation:
Hopefully this helped, if not HMU and I will get u a better answer
-have a great day! :)
In a physical change the mass remains the same before and after the process, then it is said as the mass is conserved and mass is only conserved in the isolated system.
What is the law of Conservation of Mass?A system that is isolated from its environment is one that does not communicate with it. As a result, no matter what changes or chemical reactions take place in that isolated system, the mass will remain constant; even if the final state may differ from the initial state, there can be no more or less mass than there was before the change or reaction.
The understanding that substances do not actually vanish as a result of a reaction, despite what might appear to be the case, but rather change into another material of equal mass, was made possible by the law of conservation of mass, which was essential to the development of chemistry.
To get more information about law of Conservation of mass :
https://brainly.com/question/13383562
#SPJ5
which one is more important in science, qualitative or quantitative
Answer:
quantitative
Explanation: quantitative research is better for scientist.
What is in between the nucleus and the electrons in an atom?
A jello-like goo
B.Protons and Neutrons
C.mushy substance similar to pudding
D
Empty space
Answer:
D. Empty Space
Explanation:
hey can you plz help me
Leo makes an electrical circuit using a battery, copper connecting wires, and a
lamps.
1 Sketch the assembly and say if the lamp lights up.
2 Specify the direction of movement of the free electrons.
3 Leo reverses the connections to the battery terminals. In which directions do the
free electrons.
Answer:
I can't do the sketch
the direction of elections would move though the wires opposite direction
the 3rd one I'm not sure
What’s wrong with this picture ? ..(a group of musicians having a concert on the moon in space
Answer:
Nobody can hear them play.
Explanation:
There is no sound in space.
What’s wrong with this picture is in space it is not possible to hear any sound.
Why is space completely silent?When these waves reach your ears, they are the particles that vibrate in your eardrum for you to hear. So if space is a big vacuum, there are no particles to create sound waves. Therefore, sound cannot propagate if we are floating through the cosmos.
In this way, the irony of the image is given by the musical concert between astronauts that nobody can hear them playing.
See more about cosmos at brainly.com/question/3035821
An apple is thrown across the cafeteria with a force of 10 N and at an acceleration of 6 m/s2. What is the mass of the apple? ... please answer asap
Answer:
Explanation:
F = m * a
The apple's acceleration is not influenced by the acceleration due to gravity for this question. In real life it most certainly is influenced by gravity.
F = m * a
F = 10 Newtons.
a = 6 m/s^2
m = 10/6 = 1.66 kg. Mighty large apple
PLEASE HELP MEE 15 POINTS
the model represents a(n)
A. Compound
B. Mixture
C. Element
D. Electrons
The model represents a compound, therefore the correct answer is option A.
What is a Chemical compound?
A chemical compound is a combination of two or more either similar or dissimilar chemical elements.
For example, H₂O is a chemical compound made up of two oxygen atoms and a single hydrogen atom.
A single carbon atom is covalently joined to two oxygen atoms to form the chemical molecule known as carbon dioxide or CO2.
Animals exhale it, and plants use it in the process of photosynthesis. Under normal conditions of pressure and temperature, carbon dioxide, or CO2, is a gas.
Thus, the model represents a compound, therefore the correct answer is option A.
Learn more about a chemical compound from here, refer to the link
brainly.com/question/12166462
#SPJ2
Which element would you expect to be more reactive: phosphorus (P) or fluorine (F)? Explain your answer.
Answer:
Fluorine
Explanation: Fluorine is the most reactive non-metal because it is the most electronegative of all of the non-metal elements of the periodic table.
Mark me Brainliest.
Fluorine would be more reactive.
Fluorine is a member of group 17 in the periodic table. The members of that group are called halogens.
Halogens are known to be highly reactive and for this reason they do not occur free in nature.
Also, fluorine is the most electronegative element (4.0 on Paulings scale). This explains why it is far more reactive than phosphorus (2.19).
Learn more: https://brainly.com/question/2060520
What are formed by the outermost electrons
Answer:
Im sorry but i really need these points. FORGIVE ME
Explanation:
Answer:
Valence Electrons
Explanation:
The electrons of an atom that can participate in the formation of chemical bonds with other atoms. they are the furthest electrons from nucleus
Calculate the kinetic energy of a 1500 kg car moving at 42 km/hr.
How long will it take to fall 50 m?
Answer:
down below
Explanation:
Since we aren't the given the time, lets say that an object to 25 seconds to fall 50 meters. We can use the formula [ s = d/t ] to solve.
s = 50/25
s = 2
Therefore, the object was falling at a rate of 2 meters per second.
Best of Luck!
A ball is dropped off a very tall canyon ledge.
How fast is the ball traveling after 5
seconds?
Answer:
V = 49.05 [m/s]
Explanation:
We can easily find the result using kinematics equations, first, we will find the distance traveled during the 5 seconds.
[tex]y =y_{o}+(v_{o}*t)+(\frac{1}{2}*g*t^{2} )[/tex]
where:
Yo = initial position = 0
y = final position [m]
Vo = initial velocity = 0
t = time = 5 [s]
g = gravity aceleration = 9.81 [m/s^2]
The initial speed is zero, as the body drops without imparting an initial speed. Therefore:
y = 0 + (0*5) + (0.5*9.81*5^2)
y = 122.625[m]
Now using the following equation we can find the speed it reaches during the 5 seconds.
[tex]v_{f} ^{2}= v_{i} ^{2}+(2*g*y)\\v_{f}=\sqrt{2*9.81*122.625} \\v_{f}=49.05 [m/s][/tex]
