Answer:
A scientific law is a statement based on repeated experimental observations that describes some aspect of the world. A scientific law always applies under the same conditions, and implies that there is a causal relationship involving its elements
Answer:
An object at rest will remain at rest unless an unbalanced force acts upon it.
Study Island Answer
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.
Zooflagellates belong to the phylum
a. Monera
b. Protista
c. Fungi
d. Plantae
Answer:
Zooflagellates belong to the phylum Protista.
Bill and Amy want to ride their bikes from their neighborhood to school which is 14.4 kilometers away,It takes Amy 40 minutes to arrive at school.Bill arrives 20 minutes after Amy.How much faster (in meters/second) is Amy's average speed for the entire trip?
First you must calculate the speed of Amy and speed of Bill.
[tex]
d=14.4km=14400m \\
t_a=40min=2400sec \\
t_b=20min=1200sec \\
s_a=\frac{d}{t_a}=\frac{14400m}{2400sec}=\boxed{6\frac{m}{sec}} \\
s_b=\frac{d}{t_b}=\frac{14400m}{1200sec}=\boxed{12\frac{m}{sec}} \\
[/tex]
Now calculate the difference between Bill's speed and Amy's speed.
[tex]
\Delta{s}=s_b-s_a=12\frac{m}{sec}-6\frac{m}{sec}=\boxed{6\frac{m}{sec}}
[/tex]
Amy's average speed is not faster. Bill's average speed is faster than Amy's by 6 m/sec.
Hope this helps.
r3t40
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
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.
what is one exsample of a closed economy
Answer:
When we talk about closed economy, it means that the economy is self-sufficient. At a closed economy, no imports from the outside are brought inside a nation and no exports are sent out as well
Explanation:
Answer:
An example of a close economy is Brazil.
Explanation:
A closed economy is an economy that does not interact with other economies. One example is Brazil.
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]
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.
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
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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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
A car with a mass of 600 kg is traveling at a velocity of 10 m/s. How much kinetic energy does it have? The car has J of kinetic energy.
Kinetic Energy = 1/2mv^2
m = mass
v = velocity
Mass is given as 600kg
Velocity is given as 10 m/s
Kinetic energy = 1/2 * 600 * 10^2
Kinetic energy = 3000 J
Answer:
30,000 J
Explanation:
when current flows through an electric motor, the electromagnet rotates. true or false?
Answer: true
Explanation:
It helping it rotate
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.
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.
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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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.
(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.
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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A cube of gold weights1.89N when suspended in air from a spring scale. When suspended in molasses, it appears to weight 1.76 N. What is the bouyancy force acting on the cube? Do you think the buoyancy force would bengreater or smaller if the gold cube were suspended in water?
The buoyancy force acting on the cube will be 3.65 N and the buoyancy force would be greater if the gold cube were suspended in water.
What is buoyancy force?A fluid exerts an upward force against the weight of a partly or completely submerged item.
The weight is acting downward if the weight of a cube of gold in the air is considered then the equation ios found as;
F = W+w
Where,
F is the buoyancy force
W is the weight of a cube in water
w is the weight of the cube in the air
The buoyancy force is found as;
F = W+w
F= 1.89 +1.76
F= 3.65 N
The formula for the buoyancy force is;
F=ρgV
If the density is greater the buoyancy force is greater the density of the water is greater than the air for the same condition the buoyancy force would be greater if the gold cube were suspended in water.
Hence, the buoyancy force acting on the cube will be 3.65 N and the buoyancy force would be greater if the gold cube were suspended in water.
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The buoyancy force acting on the gold cube is 0.13 N, calculated by subtracting its weight in molasses from its weight in air. According to Archimedes' principle, the buoyancy force is due to the weight of the fluid displaced, which means it would be smaller in water than in molasses due to water's lower density.
Buoyancy force acting on a gold cube and understanding how the buoyancy force would change if the cube were suspended in water instead of molasses. When the gold cube is suspended in air, it weighs 1.89 N, and when suspended in molasses, it appears to weigh 1.76 N.
To find the buoyancy force, we subtract the apparent weight in molasses from the weight in air: 1.89 N - 1.76 N = 0.13 N. Therefore, the buoyancy force acting on the cube is 0.13 N.
Archimedes' principle states that the buoyant force on an object is equal to the weight of the fluid it displaces. Since gold is denser than most fluids, it displaces a small amount of fluid, leading to a relatively small buoyancy force.
However, if the cube were suspended in water, the buoyancy force would likely be smaller than in molasses because molasses is denser than water, and thus, the cube would displace more water by volume, but water's lower density means the displaced water would weigh less, resulting in a smaller buoyancy force.
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 :>
With regard to memory, the process of retaining information over time is known as
Answer:
With regard to memory, the process of retaining information over time is known as storage.
It's known as "long-term memory".
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
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]
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
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.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!
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
what is the frequency of light with a wavelength of 6.33x10^-7m
Answer:
[tex]4.74\cdot 10^{14}Hz[/tex]
Explanation:
The frequency of an electromagnetic wave is given by
[tex]f=\frac{c}{\lambda}[/tex]
where
[tex]c=3.0\cdot 10^8 m/s[/tex] is the speed of light
[tex]\lambda[/tex] is the wavelength
For the light wave in this problem, the wavelength is
[tex]\lambda=6.33\cdot 10^{-7}m[/tex]
So by using the equation above, we find its frequency:
[tex]f=\frac{3\cdot 10^8 m/s}{6.33\cdot 10^{-7} m}=4.74\cdot 10^{14}Hz[/tex]
The frequency of light can be found by using the formula f = c ÷ λ, where c is the speed of light and λ is the wavelength. By substituting these values into the formula, you can calculate the frequency of light with a given wavelength.
Explanation:When you are given the wavelength of light and asked to find its frequency, you would use the formula c = fλ, where c is the speed of light (3.00 x 10⁸ m/s in vacuum), f is the frequency, and λ is the wavelength. To find the frequency, we rearrange this formula to get f = c ÷ λ. Given the wavelength λ = 6.33 x 10^-7 m, we can substitute these values into the rearranged formula to find the frequency:
f = (3.00 x 10⁸ m/s) ÷ (6.33 x 10^-7 m)
By calculating the above equation, you will find the frequency of the light with the given wavelength.
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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.