Answer:
232 J
Explanation:
Energy is conserved. All of the potential energy at the highest point of the swing is converted to kinetic energy at the lowest point.
5. The load across a battery consists of two resistors, with values of 15 Ohm and 45 Ohm connected in series.
a) What is the total resistance of the load?
b) What is the voltage of the battery if the current in the circuit is 0.1 A?
a) [tex]60 \Omega[/tex]
The total resistance of resistors connected in series is equal to the sum of the individual resistances:
[tex]R=R_1 + R_2 + .... + R_n[/tex]
In this problem, we have two resistors connected in series:
[tex]R_1 = 15 \Omega[/tex]
[tex]R_2 = 45 \Omega[/tex]
So the total resistance of the circuit is
[tex]R=R_1 + R_2 = 15 \Omega + 45 \Omega = 60 \Omega[/tex]
b) 6.0 V
The relationship between voltage, current and resistance of a circuit is given by Ohm's law
[tex]V=RI[/tex]
where
V is the voltage
R is the total resistance
I is the current
In this circuit, we have
[tex]R=60 \Omega[/tex] is the total resistance
I = 0.1 A is the current
So, the voltage of the battery is
[tex]V=(60 \Omega)(0.1 A)=6.0 V[/tex]
A student drew this diagram of Woese’s modern system of classification.
DOMAIN
KINGDOM
PHYLUM
ORDER
CLASS
FAMILY
GENUS
SPECIES
What is the error in this diagram?
The top level is missing.
The class and order levels are switched.
The bottom level is missing.
The kingdom and family levels are switched.
Answer:
The class and order levels are switched
Explanation:
Woese's classification starts with a division in three parts of all the organisms, which is their domain, so according to him there's Bacteria, Archaea, and Eukaryota. After the domain we have the kingdom, then phylum, class, order, family, genus, and species at the end.
We can take the leopard as an example:
Domain - Eukaryota
Kingdom - Animalia
Phylum - Chordata
Class - Mammalia
Order - Carnivora
Family - Felidae
Genus - Panthera
Species - Panthera pardus
when current flows through an electric motor, the electromagnet rotates. true or false?
Answer: true
Explanation:
It helping it rotate
An atom contains 15 neutrons and has a mass number of 30. What is its atomic number? How did you determine the atomic number?
Answer:
15
Explanation:
The mass number is defined as the total number of protons and neutrons. The atomic number is total number of protons. And since we have the mass number and number of neutrons, we can use simple subtraction (30 - 15) to find that the atomic number is 15.
The atomic number is found by subtracting the number of neutrons from the mass number; thus, with 15 neutrons and a mass number of 30, the atomic number is 15.
The atomic number can be determined by subtracting the number of neutrons from the mass number. Given that the atom contains 15 neutrons and has a mass number of 30, we can find the atomic number by using the formula: atomic number = mass number - number of neutrons.
This yields an atomic number of 15 (30 - 15 = 15), which indicates that there are 15 protons in the atom.
Please help me
The pitch of a sound is determined by its wavelength and speed together, or its ______ alone.
Answer:
Speed
Explanation:
Answer:
frequency
Explanation:
Which is the primary consumer in this food chain? rabbit grass snake hawk
Answer:
The Rabbit!
Explanation:
Because primary consumers (the rabbit) consume producers (the grass).
In the given food chain Rabbit is the primary consumer.
Explanation:
Primary consumers are herbivore which will consume plants that produce their food using photosynthesis. A primary consumer feeds on primary producers. The food chain is the consumption chain from producer through level of consumers.
Some of the examples of primary consumers are as follows,
Ruminants – Goat, cow, rabbit, and giraffe are some animals that come under this category. Zooplankton – Microorganisms fall under this category.This chart shows characteristics of three different types of atoms. Which statement is best supported by the information in the chart? Atom X will donate electrons to Atom Y. Atom X will accept electrons from Atom Y. Atom Y will accept electrons from Atom Z. Atom Z will donate electrons to Atom X. 99 PTS FOR ANSWER
- Atom X will accept electrons from Atom Y.
Answer:
Atom X will accept electrons from Atom Y is correct!
Zooflagellates belong to the phylum
a. Monera
b. Protista
c. Fungi
d. Plantae
Answer:
Zooflagellates belong to the phylum Protista.
Why does a hot air balloon rise?
A. The weight of the air displaced by the balloon is less than the volume of the balloon.
B. The weight of the balloon is less than the weight of the air displaced by the balloon.
C. The volume of the air displaced by the balloon is less than the volume of the balloon.
Answer:
B. The weight of the balloon is less than the weight of the air displaced by the balloon.
Explanation:
Hot air balloons rise because of buoyancy (The force that cause objects to rise in the air). In order for the balloon to float, in needs to be lighter (less dense) than the surrounding air. By adding lighter hot air, It's causes the balloon to have less weight that the air it displaces.
Answer:B.
The weight of the balloon is less than the weight of the air displaced by the balloon.
Explanation:gradpoint
The period of a mechanical wave is 5 seconds. What is the frequency of the wave?
10 Hz
2.5 Hz
0.2 Hz
depends on the speed of the wave
The answer is 0.2 Hz. Hope this helps you :)
the answer is 0.2 Hz
through which type of media can mechanical waves move ?
Answer: Solids, liquids, and gasses.
Explanation:
well a mechanical wave is a disturbance in matter that carries energy from one place to another, and a medium (or media because you put the question in pluralised form) is matter through which a wave travels. So, Solids, liquids, and gasses.
what type of wave travels faster through solids than it does through gases?
Answer:
Liquids are more dense than gases, but less dense than solids, so sound travels 2nd fast in liquids. Gases are the slowest because they are the least dense: the molecules in gases are very far apart, compared with solids and liquids.
Explanation:
Answer:
Longitudinal waves travels faster through solids than it does through gases
Explanation:
As we know that longitudinal waves travels through all types of mediums and the speed of longitudinal waves is given as
[tex]v = \sqrt{\frac{E}{\rho}}[/tex]
here we know that
E = elasticity of the medium
[tex]\rho[/tex] = density of the medium
now here we know that elasticity of solids is much more than the elasticity of gases
So the speed of longitudinal waves in solids is more than the speed of waves in gases
(a) Figure 1 shows a mas of 1200 kg hung by a massless cable supported by a counterweight of mass 900 kg. You may assume the gravitational acceleration to be 10 m/s2.
Determine the magnitude of the acceleration (in m/s2) of the 1200 kg mass and also the magnitude of the tension (in N) in the cable. Show your workings clearly.
Please help me bcoz I don't really understand how to do without a proper explanation behind the working. I'm quite weak in this subject, I m sorry :(
Answer:
1.43 m/s², 10,300 N
Explanation:
First things first is to draw a picture. Fortunately, one was already provided.
Next, we need to draw a free body diagram for each mass.
The 1200 kg mass has two forces acting on it: tension pulling up and weight pulling down.
Similarly, the 900 kg mass has two forces acting on it: tension pulling up and weight pulling down.
Now we apply Newton's second law. Let's start with the 1200 kg. If we say that up is positive, then:
∑F = ma
T - W = M(-a)
T - Mg = -Ma
Notice that I made the acceleration negative. That's because we know that the heavier mass will be accelerating down.
Now we apply Newton's second law to the 900 kg mass:
∑F = ma
T - W = ma
T - mg = ma
Now we have two equations and two unknowns (T and a). Let's solve for the acceleration first. To do that, let's subtract the two equations so we can eliminate T (if you prefer, you can also use substitution instead):
-mg − (-Mg) = ma − (-Ma)
-mg + Mg = ma + Ma
g (M - m) = a (M + m)
a = g (M - m) / (M + m)
Given that M = 1200 kg, m = 900 kg, and g = 10 m/s²:
a = 10 m/s² (1200 kg - 900 kg) / (1200 kg + 900 kg)
a = 10/7 m/s²
a ≈ 1.43 m/s²
Now let's find the tension by plugging our answer into either of the two equations.
T - mg = ma
T - (900 kg) (10 m/s²) = (900 kg) (10/7 m/s²)
T = 72000/7 N
T ≈ 10,300 N
I'm not sure what rounding rules you need to follow, but hopefully this helps.
examples of firearm identification includes:
Answer: Firearm identification is the process of analyzing the bullets and cartridge cases left at a crime scene to determine if they came from a particular firearm. Marks on the bullets and cartridges may be common to every firearm of that type (for example, the caliber of the firearm). These are called class characteristics.
Explanation: i go to flvs to what teacher
The temperature of water in a beaker is 45°C. What does this measurement represent?
A.
the heat capacity of water
B.
the total thermal energy of water
C.
the average kinetic energy of water particles
D.
the total kinetic energy of water particles
Answer:
the average kinetic energy of water particles - C.
A house painter uses the chair-and-pulley arrangement of (Figure 1) to lift himself up the side of a house. The painter's mass is 55 kg and the chair's mass is 10 kg .
If the painter is at rest, what is the tension in the rope?
Answer:
Explanation:
Draw a free body diagram for the painter. There are three forces acting on him. The tension in the rope pulling him up, the normal force of the chair pushing him up, and gravity pulling him down.
Apply Newton's second law:
∑F = ma
T + N - W = ma
Since the painter is at rest, a = 0.
T + N - W = 0
T = W - N
T = Mg - N
Now draw a free body diagram of the chair. The chair has three forces acting on it also. The tension in the rope pulling it up, the normal force pushing down, and gravity pulling down.
Newton's second law for the chair:
∑F = ma
T - W - N = ma
Since the chair is also not accelerating, a = 0:
T - W - N = 0
T = W + N
T = mg + N
Now we have two equations and two variables. If we add the equations together, we can eliminate N:
2T = Mg + mg
2T = (M + m) g
T = (M + m) g / 2
Given that M = 55 kg, m = 10 kg, and g = 9.8 m/s²:
T = (55 + 10) (9.8) / 2
T = 318.5 N
If we round to two sig-figs, the tension in the rope is 320 N.
The tension in the rope is 637 Newtons, which is the total weight of the painter and chair multiplied by the acceleration due to gravity (9.8 m/s^2). This is because the system is at rest, so the tension in the rope must balance out the downward force of gravity.
Explanation:The subject of this question is Physics, specifically when discussing forces and tension in ropes. The situation describes a house painter who is on a chair, lifted by a pulley system, and the entire system is at rest. We assume that the only forces acting on the system are gravity and the tension in the rope.
Both the painter and the chair are experiencing a downward force due to gravity. We can calculate this by multiplying their mass by the acceleration due to gravity (which is about 9.8 m/s^2 on Earth). For the painter, this is 55 kg * 9.8 m/s² = 539 N. For the chair, it is 10 kg × 9.8 m/s² = 98 N.
Because the system is at rest, the rope must be exerting an equal and opposite force upwards, to balance out the force of gravity. This force is the tension in the rope. If we add up the forces acting on the painter and the chair, we get a total of 539 N + 98 N = 637 N. So, the tension in the rope is 637 Newtons.
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if two identical cars are traveling at different velocities, which car has the greatest momentum
Answer:
The one with highest velocity
Explanation:
The momentum of an object is given by
[tex]p=mv[/tex]
where
m is the mass of the car
v is the velocity of the car
In this problem, we have two identical cars: identical means they have same mass, so
[tex]m_1 = m_2 = m[/tex]
The momentum of car 1 is
[tex]p_1 = mv_1[/tex]
while the momentum of car 2 is
[tex]p_2 = mv_2[/tex]
By comparing the two expressions, we see that the car with greatest momentum is the one with highest velocity, since the mass is the same.
predict what will happen to the image produced by a concave lens as the lens gets flatter and flatter- more like a flat piece of glass
The flatter concave lens becomes the emergent ray moves towards being parallel two incident rays.
Explanation-
A concave lens is a lens that diverges the rays, passing through the lens, from its path thereby appearing to come from a point where image is formed these types of lenses are used by people who find trouble in seeing things that are at a distance. The flatter the lens become it moves more towards becoming a glass slab which refracts the light such that the emergent ray is parallel two incident Ray but only from another point.
As a concave lens becomes flatter and more like a flat piece of glass, its focal length increases. This reduces its capability to bend light rays, diminishing its effect on the image until the lens no longer forms a distinct image and the virtual image is the same size as the object.
Explanation:As a concave lens becomes flatter, approaching the shape of a flat piece of glass, its focal length increases until it theoretically becomes infinite. A lens with an infinite focal length means there is no specific point at which it focuses light rays, effectively not forming a distinct image. This can be understood using ray tracing methods, where a ray that enters parallel to the axis appears to come from the focal point, and a ray passing through the center of the lens continues straight. In the case of an infinitely flat lens, these rays would continue in a straight path, mimicking what happens with a flat piece of glass. The virtual image produced by a concave lens is always smaller than the object and remains the same when the lens becomes flatter, but the minification effect weakens gradually. Eventually, when the lens is completely flat, it neither diverges nor converges light, so the size of the virtual image is essentially the same as the object.
When talking on a phone, the voice is transformed into electrical energy. This energy passes over wires or is transmitted through the air. Into what kind of energy does the speaker in the phone on the other end change the electrical energy?
Answer:
sound energy
Explanation:
Answer:
sound energy perriod
What is the purpose of each of the components (each shown with leader and line) of the circuit shown is the diagram?
The wires is what is needed to put together the whole thing, kinda like glue when you're gluing a piece of paper on it.
Anyways, the battery is the main source and main energy per say.
That energy that comes from the battery, thanks to the wires, it can transfer that said energy to both the switch and light bulb.
And as you flick the switch, it depends of how you put it together, there's two options, turning the light bulb on or turning it off.
Though it doesn't mean that since the light bulb is connected to the battery makes the bulb turn on no matter what since the switch can cancel the main source's energy.
- Ouma :>
In any energy transformation, energy is _____.
Answer:
In any energy transformation, energy is the change of energy from one form to another.
In any energy transformation, energy is Conduction.
The conversion of one form of energy into every other, or the motion of electricity from one location to every other. A strength transformation is the change of strength from one shape to any other. The cloth that doesn't conduct warmness, electricity, light, or sound. electricity or pressure an object has because of its motion.
Conduction is the system via which warmness electricity is transmitted through collisions between neighboring atoms or molecules. Conduction occurs more with ease in solids and drinks, in which the particles are closer collectively than in gases, in which debris are similarly apart.
While electricity is transferred from one part of a machine to every other?Conduction is the switch of power from one molecule to another by direct contact. This switch happens when molecules hit each differently, much like a game of pool where one moving ball strikes the other, causing the second to move.
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if a light ray strikes a flat mirror at an angle of 44° from horizontal the reflected ray will be
Answer: The reflected ray will be 44 degrees.
Explanation: The Law of Reflection states the angle of incidence ( the incoming light ray) equals the angle of reflection ( the light ray being reflected) Therefore, the angle of reflection will be 44 degrees.
Hope that helped!
Which of the following mechanical waves has the most energy
A
B
C
D
the answer is d because it has the smallest wavelength
Explanation:
Mechanical wave are the waves that requires a medium for its propagation. The energy of wave is given by the following formula as :
[tex]E=\dfrac{hc}{\lambda}[/tex]
Where
h = Planck's constant
c = speed of light
[tex]\lambda[/tex] = wavelength
So, the energy of wave is inversely proportional to its wavelength.
From the given figure, the distance between two consecutive crests and trough is minimum in figure (4). So, figure (4) has most energy.
The distance versus this plot for a particular object shows a quadratic relationship. Which column of distance data is possible for this solution?
Answer:
A
Explanation:
In Column A, the pattern is 1², 2², 3², etc. So x(t) = t², which is quadratic.
In Column B, the pattern is 2*1, 2*2, 2*3, etc. So x(t) = 2t, which is linear.
In Column C, the pattern is 9*1, 9*2, 9*3, etc. So x(t) = 9t, which is linear.
In Column D, the pattern is 1/1, 1/2, 1/3, etc. So x(t) = 1/t, which is reciprocal.
In Column E, the pattern is 1/1², 1/2², 1/3², etc. So x(t) = 1/t², which is reciprocal.
On a flat surface the coefficient of friction is a ratio between _______an weight of the object
Answer:
The Force Of Friction
On a flat surface, the coefficient of friction is the ratio between the force of friction and the weight of the object. Hence, the correct answer is force.
The force of friction is the force that opposes the motion of an object when it is in contact with a surface. The weight of an object is the force exerted on it due to gravity and is calculated as the mass of the object multiplied by the acceleration due to gravity.
μ = F(friction) / N
μ = F(friction) / (m × g)
Therefore, the coefficient of friction is the ratio between the force of friction and the weight of the object. Hence, the correct answer is force.
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Because water molecules are polar and carbon dioxide molecules are nonpolar, Question 9 options: water has a lower boiling point than carbon dioxide does. carbon dioxide cannot exist as a solid. attractions between water molecules are weaker than attractions between carbon dioxide molecules. water has a higher boiling point than carbon dioxide does.
Answer:
The correct answer is: Water has a higher boiling point than carbon dioxide does.
Explanation:
Ok, because water is a polar molecule and its bonds are hydrogen bonds, this causes its boiling point to be higher than that of carbon dioxide, since hydrogen bonding is more resistant to rupture (in this case when heating), on the other hand carbon dioxide has convalent bonds, which are weaker. Therefore, the water will have a boiling point higher than that of carbon dioxide, since it costs more to break its polar bonds. This will also be true for any molecule that has hydrogen bonding links and is polar.
electric energy used in the home is measured in a unit called the _______.
Answer:
Kilowatt per hour
Explanation:
The energy is equal to the power by time.
[tex]E=\frac{P}{t}[/tex]
How does a convex mirror form an image?
A.It bends the light toward a focal point.
B.It bends the light away from a focal point.
C.It bounces the light toward a focal point.
D.It bounces the light away from a focal point.
The convex mirror form an image by bouncing the light away from a focal point.
Answer: Option D
Explanation:
A diverging mirror is a reflecting surface which is a spherical one. The bulging side of the convex mirror will face towards the light source. It is a diverging mirror in which rays diverge upon after reflection. These are often used in the mirrors that are in the automobiles.
The image that is formed by the convex mirror cannot be displayed on the screen. Hence, they are called as Virtual image. The resulting image by the convex mirror is upright, virtual and size diminished.
A convex mirror forms an image by it bends the light away from a focal point. Therefore option B is correct.
A convex mirror is a curved mirror with a reflective surface bulging outward. When light rays hit a convex mirror, they are reflected and diverge, spreading out in different directions.
This divergence of light rays causes the image formed by a convex mirror to appear smaller and virtual (not formed by actual light rays converging at a specific point).
Thus, a convex mirror forms an image by bending the light away from a focal point. The curvature of the mirror causes light rays to diverge and spread out, resulting in the formation of a smaller, virtual image located behind the mirror.
Therefore option B is correct.
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true or false refraction occurs when the amplitude of a wave changes as it goes from one medium to aother
The answer here is true
Final answer:
Refraction is the bending of light waves as they pass from one medium to another and involves a change in speed and direction, not amplitude. The statement provided is false.
Explanation:
The statement provided by the student is false. Refraction is the bending of light waves, which occurs when a light wave passes from one medium to another, such as air to glass. The key aspect of refraction is the change in direction of the wave due to a change in its speed as it moves between media with different densities. However, refraction does not involve a change in the amplitude of the wave, but rather a change in the wave's speed, and, consequently, its wavelength. Moreover, the frequency of the wave remains constant during this process.
Which statement describes Rutherford model of an atom
Answer:
what are the statements
Explanation:
Answer:
Almost all the mass and all the positive charge of the atom is concentrated in a very small region called the nucleus and the negative charge was distributed throughout the rest of the atom
Explanation:
Rutherford's experiment was to bombard a gold foil with alpha particles, finding that most of the particles change their direction very little, some change it a lot and very few almost recede; With these measurements he came to the conclusion that almost the entire mass of the atom had to be in a very small space that I call a nucleus, in addition as the alpha particles have two positive charges so that there is a force of repulsion the charge of the nucleus must also be positive; with this I enunciate an atomic model:
Almost all the mass and all the positive charge of the atom is concentrated in a very small region called the nucleus and the negative charge was distributed throughout the rest of the atom