Electrical energy = Power x time.
30 minutes = 0.5 hours.
Electical energy = 1200W x 0.5 hours = 600W/hour = 0.6kWh
Acid compounds contain a.Oxygen B. Ion c. Hydrogen
Answer:
c hydrogen
Explanation:
The answer is Hydrogen
Number the steps of stellar evolution in the correct order
Answer:
1.) Nebular cloud of gas and dust.
2.) Cloud collapses under the force of its own gravitational attraction; usually triggered by a supernova.
3.)Condensed material begins to combine and form a core center, as it warms, a protostar is formed.
4.)Other gas and matter of the nebular cloud begin to rotate around the protostar, forming a flattened disk.
5.) Stellar core heats as it grows; nuclear fusion begins and a star is born.
6.) Nuclear energy runs out; death: possible supernova.
Hope this helped you out!
which of the following is not transparent? A. clear glass b. plastic c. water d. tracing paper
D is the answer I’m pretty sure
Which describes how sliding friction affects pushing a cereal box across a tabletop?
It is usually greater than static friction.
It acts in the direction of motion.
It equals the weight of the box.
It acts in the direction opposite of motion.
Answer:
It acts in the direction opposite of motion.
Explanation:
The sliding friction is the one offering resistance to motion of the sliding cereal box.This force is created between the box and the tabletop that are sliding against each other.The sliding friction is proportional to the weight of the cereal box when pushed on the horizontal tabletop.We can apply the Newton's second law of motion to describe this motion, where force is a product of mass and acceleration.When the object is massive, the sliding friction force experienced is high thus sliding happens slowly.
When a state legislature or the U.S. congress passes an act into law, it generally becomes known as which
*statute
. ordinance
. appointment
. executive order
Answer:
the answer is . d
Explanation:
the answer is A.Statute
A radioactive polonium sample has a half-life of 103 years. How much of a 100 g sample would remain after 412 years?
Answer:
6.25 g
Explanation:
The half-life of a radioactive isotope is the time needed for the mass of the sample to halve.
Here, we a radioactive polonium sample, whose half-life is
[tex]\tau_{1/2} = 103 y[/tex]
The mass of sample left after a time t is given by the equation
[tex]m(t) = m_0 (\frac{1}{2})^{t/t_{1/2})[/tex]
where
[tex]m_0 = 100 g[/tex] is the initial mass
[tex]\tau_{1/2} = 103 y[/tex] is the half-life
If we substitute t = 412 y , we find the mass of sample left:
[tex]m(t) = (100 g) (\frac{1}{2})^{412 y/103 y}=(100 g)(\frac{1}{2})^{1/4}=6.25 g[/tex]
After 412 years, approximately 6.25 grams of a 100 gram polonium sample would remain, given a half-life of 103 years.
Explanation:The subject matter in this question concerns the half-life of radioactive polonium. A half-life is the time it takes for half of a sample of a radioactive substance to decay. For polonium, this is stated to be 103 years.
Given that the half-life of polonium is 103 years, a 100 g sample would reduce to half its size (50 g) after 103 years. After another 103 years (206 years total), this 50 g would reduce by half again to 25 g. After 309 years, the sample would half again, leaving 12.5 g. Finally, after 412 years (or roughly 4 half-lives), the remaining amount of the initial sample would be half of 12.5 g, which is 6.25 g.
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In the following lever system, what is the counter-clockwise torque?
18 Nm
240 Nm
360 Nm
480 Nm
the correct answer is 480nm
Answer:
D: 480
Explanation:
What happens to energy that is used to overcome friction?
It transforms into heat and gets dissipated to the surroundings in the natural way of moving from hot locations to cooler ones.
What are the reactants of cellular respiration? Check all that apply. carbon dioxide energy glucose oxygen water
Answer:
Glucose and Oxygen
Explanation:
Cellular respiration is the process whereby cells derives energy by the use of glucose and oxygen.
Organisms that use cellular respiration to produce their energy are known as heterotophs. They derive the glucose from food materials obtained from plant sources. They use the oxygen from the environment to liberate energy from the glucose obtained from feeding on plant materials.
Cellular respiration can be simply expressed as shown below:
GLUCOSE + OXYGEN → CO₂ + H₂O + ATP
The reactants are glucose and oxygen.
The products are CO₂, water and ATP
The reactants of cellular respiration are oxygen and glucose. These substances combine in a process that takes place in the mitochondria, ultimately producing ATP alongside waste products carbon dioxide, and water.
Explanation:Cellular respiration is a fundamental metabolic process that occurs in the cells of organisms to produce energy. The reactants of cellular respiration are oxygen and glucose. Oxygen is taken into the body through the process of breathing, and glucose enters the body via the food organisms eat. These reactants are essential for the production of adenosine triphosphate (ATP), the energy currency of cells.
The equation for cellular respiration can be represented as follows: C6H12O6 + 6O2 → 6CO2 + 6H2O + Energy. This indicates that one molecule of glucose (C6H12O6) and six molecules of oxygen (O2) are transformed into six molecules of carbon dioxide (CO2) and six molecules of water (H2O), releasing energy in the process.
The main product of cellular respiration is ATP, which is generated from the energy released during the conversion of glucose and oxygen into carbon dioxide and water. The waste products, carbon dioxide and water, are byproducts of this reaction.
Where would a positive test charge have the least potential energy?
actually the line through the midpoint and perpendicular to the line joining the two charges. that the positive and negative charges are equal in magnitude.
A positive test charge only has potential energy if there's a negative charge out there somewhere, attracting it.
As long as the positive charge is not right up close to the beckoning negative charge, it'll spring in that direction if you let it.
So the positive test charge doesn't run out of potential energy until it reaches the place of its heart's desire ... as far from other positive charges as it can get, AND up against or on top of the nearest negative charge.
An oceanic depth-sounding vessel (sonar) surveys the ocean bottom with ultrasonic sound that travels at an average of 1522m/s. How deep is the water if the time delay of the echo from the ocean floor is 2.0s?
Answer:
1522 m
Explanation:
The ultrasound wave takes t=2.0 s to travel from the vessel to the ocean bottom, and then back to the vessel.
This means that the time the wave takes to travel from the vessel to the ocean bottom is just half of this:
[tex]t=\frac{2.0 s}{2}=1.0 s[/tex]
The wave travels at a speed of
v = 1522 m/s
So, we can find the distance between the vessel and the ocean bottom by using the equation of the uniform motion, and we find:
[tex]d=vt=(1522 m/s)(1.0 s)=1522 m[/tex]
Directions: WRITE a summary of the Newton’s Laws of Motion reading.
Your summary must correctly use the following academic language:
-Motion.
- inertia .
-acceleration interaction.
Answer:
In the Newton's first law of motion, a stationary body or that moving with uniform motion will only chnage its state if acted upon by other forces externally.This kind of resistance is caused by the force of inertia.In his second law of motion,when a body is acted by a force, the force will be equal to the product of mass and acceleration of the body.i.e F=ma. In the third law of motion, it explains that a body will exert an equal and opposite force when interacting with another body.Thus, every action force experiences an equal and opposite reaction force.Here the momentum of the bodies will be conserved.
AlBr3 + K2SO4 → KBr + Al2(SO4)3
What are the coefficients required to balance the chemical equation?
A) 1,3,6,1
B) 2,1,6,1
C) 2,3,1,1
D) 2,3,6,1
Answer: D
Explanation:
Based on the balanced equation of the reaction, the coefficients of the balanced equation are as follows; 2, 3, 6 and 1., option D.
What is the balanced equation of the reaction between aluminium bromide and potassium sulfate?The balanced equation of the reaction between aluminium bromide and potassium sulfateis given below:
2AlBr3 + 3 K2SO4 → 6KBr + Al2(SO4)3
Therefore, the coefficients of the balanced equation are as follows; 2, 3, 6 and 1.
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Neutrons are also known as_____.
Neutrons are also known as subatomic particles. This means that they are smaller than an atom but they can be elementary or composite. Neutrons are located in the nucleus of the atom also called the center.
A book falls off a shelf that is 10.0 m tall. What is the velocity at which the book hits the ground?
Answer:
14 m/s
Explanation:
The motion of the book is a free fall motion, so it is an uniformly accelerated motion with constant acceleration g=9.8 m/s^2 towards the ground. Therefore we can find the final velocity by using the equation:
[tex]v^2 = u^2 + 2gd[/tex]
where
u = 0 is the initial speed
g = 9.8 m/s^2 is the acceleration
d = 10.0 m is the distance covered by the book
Substituting data, we find
[tex]v=\sqrt{0^2 + 2(9.8 m/s^2)(10.0 m)}=14 m/s[/tex]
An object with a mass of 120 kilograms is moving at a velocity of 30 m/s. What's its momentum?
A. 3,600 m/s/kg
B. 0.25 kg-m/s
C. 3,600 kg-m/s
D. 4 kg-m/s
I believe the correct answer is A
The momentum of the object is 3600 kg m/s.
Answer: Option C
Explanation:
Momentum is the measure of motion done by an object. It is a vector quantity. It is defined as measure of velocity at which object is moving. So the momentum is found to be directly proportional to product of mass (m) of the object and velocity attained by the object. Thus,
[tex]\text {Momentum of the object} = m \times \text { Acceleration }[/tex]
As the mass of the object is given as 120 kg and the velocity attained by the object is 30 m/s, then the momentum of the object will be
[tex]\text {Momentum of the object} = 120 \times 30 = 3600 \mathrm{kgm} / \mathrm{s}[/tex]
So, the momentum of the object is 3600 kg m/s.
which ocean zone has the most sunlight? A. Abyssopelegic B. Bathypelagic
C. Hadalpelagic D. Mesopelagic
The answer is D, Mesopelagic.
The ocean zone that has the most sunlight is Mesopelagic. The correct option is D.
What is Mesopelagic?The Mesopelagic zone is a scope of sea depth that beginnings from 650 feet beneath the water's surface to around 3,280 feet underneath. Light entrances from the outer layer of the sea almost scatter at this area. The most widely recognized organic entities found in the mesopelagic zone are little fish, squid, and basic shellfish.
This region receives most of the sunlight.
Thus, the correct option is D.
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A 2.50 kg flower pot is pushed out a window this is at a height of 12.0m onto a spring with a spring constant of 800.N/m. How much does the spring compress if the ball comes to a stop.
Answer:
0.86 m
Explanation:
We can solve the problem by using the law of conservation of energy.
The initial mechanical energy of the flower pot is just gravitational potential energy, given by:
[tex]E_i = U = mgh[/tex]
where
m = 2.50 kg is the mass of the pot
g = 9.8 m/s^2 is the acceleration due to gravity
h = 12.0 m is the height
When the pot hits and compresses the spring coming to a stop, all this energy is converted into elastic potential energy of the spring:
[tex]E_f = U = \frac{1}{2}kx^2[/tex]
where
k = 800 N/m is the spring constant
x is the compression of the spring
Due to the conservation of energy,
[tex]E_i = E_f[/tex]
So we can write
[tex]mgh=\frac{1}{2}kx^2\\x=\sqrt{\frac{2mgh}{k}}=\sqrt{\frac{2(2.50 kg)(9.8 m/s^2)(12.0 m)}{800 N/m}}=0.86 m[/tex]
how do you draw two vectors to represent two forces that balance each other?
If two forces "balance" each other, that means that they add up to zero.
THAT means that they must have exactly equal magnitudes and exactly opposite directions.
If you want to draw a picture of a pair of two balanced force vectors . . . .
1). Draw two arrows with exactly the same length.
2). Flip one of them over, so that it points in exactly the opposite direction compared to the first one.
3). Place them tail-to-tail.
a train travels some distance with a speed of 30km/h and returns with a speed of 45km/h. Calculate the average speed of the train.
Answer:
let distance be D km
total time taken, T (hrs) = D/30 + D/50
Average speed , V = total distance/ total time = 2D/T = 2/(1/30+1/50) = 37.5 km/hr
Explanation:
Average speed = total distance / total time
= (30+45) km / 2hr
= 75 / 2
= 37.5 km/hr is the average speed of the train.
The phrases describes what layer of the atmosphere
Meteors burn up here
special lighting called sprites
noctilucent clouds form over north and south poles
1. exophere
2. ionosphere
3. mesophere
4. thermosphere
Answer:
the answer is Mesosphere
Explanation:
The water pressure at the bottom of the Marianas Trench is approximately 1,100 kPa. With how much force would the water pressure at the bottom of the Marianas Trench push on a fish with a surface area of 0.50 m^2?
Answer:
550 kN
Explanation:
Force is equal to pressure times area.
F = AP
F = (0.50 m²) (1,100,000 Pa)
F = 550,000 N
F = 550 kN
The formation of a standing wave requires _____.
constructive interference between two waves with different frequencies
interference between the incoming and reflected waves of the same frequency
two waves that have been traveling over a long distance
the formation of a standing wave requires interferencethe incoming and reflected waves of the same frequency
Answer: The correct answer is "interference between the incoming and reflected waves of the same frequency"
Explanation:
Standing wave: Standing wave will form when two waves of equal frequency travelling in an opposite direction in the same medium. There is interference between the incoming and reflected waves of the same frequency.
These waves do not appear to move. There is an oscillation up and down in same phase. Standing wave consists of node and antinode.
Anti node: It is the location in the wave where the amplitude is minimum.
Node: It is the location in the wave where the amplitude is maximum.
Therefore, the correct option is "interference between the incoming and reflected waves of the same frequency ".
A person pushes a crate up a 4-m high ramp for a distance of 18m.
a) What is the mechanical advantage of the ramp?
b) How hard does the person have to push if the crate weights 400 N
a) 4.5
The mechanical advantage of a frictionless ramp is given by:
[tex]MA=\frac{L}{h}[/tex]
where
L is the length of the ramp
h is the height of the ramp
In this problem,
L = 18 m
h = 4 m
Substituting these values into the formula, we find
[tex]MA=\frac{18 m}{4 m}=4.5[/tex]
b) 88.9 N
For a frictionless ramp, the input work is equal to the output work:
[tex]W_i = W_o\\F_i L = F_o h[/tex]
where
[tex]F_i[/tex] is the force applied by the person
L = 18 m is the length of the ramp
[tex]F_o = 400 N[/tex] is the output force, which corresponds to the weight of the crate
h = 4 m is the height of the ramp
Solving the equation for [tex]F_i[/tex],
[tex]F_i = \frac{F_o h}{L}=\frac{(400 N)(4 m)}{18 m}=88.9 N[/tex]
Like his parents, Thomas is short, stocky, and heavyset. Although he exercises regularly and eats a well-balanced meal, his body composition stays the same. Explain what factor is most likely affecting his body composition..
Answer:The factor that is most likely affecting Thomas's body composition is genetics. Heredity influences the amount of fat a person possesses, and children with heavyset parents are more likely to be heavyset.
Explanation:
sample response
The factor that is affecting his body composition is genetic makeup.
The factors that affect body compositionThe body composition of an individual is the percentage of the body that is made up of fat, bone and muscles.
The percentage of each component found in an individual is determined by the following factors:
Gender, age, race, nutrition, physical activity, hormonal status andGenetic makeup.The deoxyribonucleic acid (DNA) of an individual can either have little or much effect on the body composition.
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Which of the answers is most accuracy for balancing nuclear equations?
Answer:
#4
Explanation:
In balanced nuclear and chemical equations, the sums of the subscripts on each side of the equation and the sums of the superscripts are the same. The most useful quantity for counting particles is the mole. Steps for balancing a chemical equation involve identifying the most complex substance, balancing the atoms and polyatomic ions, and counting the numbers of atoms to ensure a balanced equation.
Explanation:In balanced nuclear equations, the sums of the subscripts on each side of the equation are the same, as are the sums of the superscripts.
The most useful quantity for counting particles is the mole. So if each coefficient is multiplied by a mole, the balanced chemical equation tells us that 1 mole of nitrogen reacts with 3 moles of hydrogen to produce 2 moles of ammonia. This is the conventional way to interpret any balanced chemical equation.
Steps in Balancing a Chemical Equation:
Identify the most complex substance.Beginning with that substance, choose an element(s) that appears in only one reactant and one product, if possible. Adjust the coefficients to obtain the same number of atoms of this element(s) on both sides.Balance polyatomic ions (if present on both sides of the chemical equation) as a unit.Balance the remaining atoms, usually ending with the least complex substance and using fractional coefficients if necessary. If a fractional coefficient has been used, multiply both sides of the equation by the denominator to obtain whole numbers for the coefficients.Count the numbers of atoms of each kind on both sides of the equation to be sure that the chemical equation is balanced.
2. Which describes the law of reflection?
The angle of reflection equals the angle of incidence.
The angle of reflection is greater than the angle of incidence.
The angle of reflection is less than the angle of incidence.
Answer: Choice 1
Law of Reflection
Theta(i)=Theta(r)
Angle of incidence=Angle of reflection
Which describes the law of reflection?
The angle of reflection equals the angle of incidence. The angle of reflection is greater than the angle of incidence. The angle of reflection is less than the angle of incidence. Further explanationThe laws of reflection are, the incident ray, the reflected ray and the normal to the reflection surface at the point of the incidence are lie in the same plane. The reflected ray and the incident ray are on the opposite sides of the normal.
The law of reflection states that when a ray of light reflects off a surface, then the angle of incidence is equal to the angle of reflection. Light is known to behave in a very predictable manner.
In the diagram the ray of light that approaching the mirror is known as the incident ray (labeled I), whereas the ray of light that leaves the mirror is known as the reflected ray (labeled R) .
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Grade: 9
Subject: physics
Chapter: reflection
Keywords: the law of reflection, reflection, incidence, the angle of incidence, angle
MOST elements on the periodic table are
A) gases
B) metals
C) nonmetals
D) rare earth elements
Answer:
B
Explanation:
MOST elements on the periodic table are metals.
Answer:B
how can magnetic and electric fields be demonstrated?
Answer:
To demonstrate that an electric current (i.e., moving electric charge) generates a magnetic field, all you need do is simply place a magnetic compass next to a wire in a circuit. When current is passed through the wire, the compass will deflect, indicating the presence of a magnetic field circling the wire.
Explanation:
Electric field is always associated with magnetic field.
Explanation:
Relationship between electric and magnetic fields can be explained by the following example. Consider a wire and a magnetic compass placed close together.
When current is flowing through the wire, the needle in the magnetic compass will deflect showing some value indicating the presence of magnetic field during the experiment. This indicates that the electric field is generally accompanied with the magnetic field.
Describe what happens when electrical impulses cross muscle fibers
Answer:
When the electrical potential reaches a threshold, an actual potential occurs in the muscle fibers.
Explanation:
A muscle fiber is a special type of a cell which can change its shape due to actin chains sliding across each other. This process then causes changes in the electrical potential of the muscle.
There are few types of muscle fiber that designed for specific type of muscles activity. Some of them involved in endurance exercises whereas others are best for the strength exercises. These muscles fibers are attached to bones allowing them to move.