The density at 25 degrees is [tex]1.35\cdot 10^4 kg/m^3[/tex]
Explanation:
The density of a material is given by
[tex]d=\frac{m}{V}[/tex]
where
m is its mass
V is its volume
The volume of a material changes as a function of the temperature, according to
[tex]V(T)=V_0(1+\alpha (T-T_0))[/tex]
where
[tex]V_0[/tex] is the volume at temperature [tex]T_0[/tex]
[tex]\alpha[/tex] is the coefficient of volume expansion
In this problem, let's take a sample of mercury of mass
m = 1 kg
The density at 0 degrees is
[tex]d_0 = 1.36\cdot 10^4 kg/m^3[/tex]
So the corresponding volume is
[tex]V_0 = \frac{m}{d_0}=\frac{1}{1.36\cdot 10^4}=7.35\cdot 10^{-5} m^3[/tex]
For mercury,
[tex]\alpha = 2.8\cdot 10^{-4} ^{\circ}C^{-1}[/tex]
So the volume when [tex]T=25^{\circ}C[/tex] is
[tex]V(25)=(7.35\cdot 10^{-5})(1+2.8\cdot 10^{-4}(25-0))=7.4\cdot 10^{-5} m^3[/tex]
And since the mass has not changed, we can now calculate the density at 25 degrees:
[tex]d_{25}=\frac{m}{V_{25}}=\frac{1}{7.4\cdot 10^{-5} m^3}=1.35\cdot 10^4 kg/m^3[/tex]
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A line on a speed-time graph with a steep slope indicates a greater speed
False: a line on a speed-time graph with a steep slope indicates a greater acceleration
Explanation:
In a speed-time graph, we have:
The time represented on the x-axisThe speed represented on the y-axisThis means that the slope of this graph is
[tex]m=\frac{\Delta y}{\Delta x}=\frac{\Delta v}{\Delta t}[/tex]
where
[tex]\Delta v[/tex] is the change in speed
[tex]\Delta t[/tex] is the change in time
However, acceleration is defined as
[tex]a=\frac{\Delta v}{\Delta t}[/tex]
where [tex]\Delta v[/tex] is the change in velocity. If we consider a motion in a straight line, the change in velocity corresponds to the change in speed: therefore, the slope of a speed-time graph corresponds (for a straight line motion) to the acceleration.
Therefore, the steeper the slope, the greater the acceleration of the body.
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50200 J of heat are removed from
a block of ice, causing its
temperature to drop by 8.00°C.
What is the mass of the ice?
(Unit = kg)
Correct Answer:
3.1375
Explanation:
Use equation [tex]Q=mc[/tex]Δ[tex]T[/tex] to find [tex]m[/tex]
Plug in all variables [tex]-50200=x\cdot 2000\cdot -8[/tex]
Answer: 3.1375
Final answer:
The mass of the ice block is approximately 3.01 kg, calculated using the relation Q = mcΔT with the values given and the specific heat capacity of ice.
Explanation:
To determine the mass of the ice based on the heat removed and the temperature change, we can use the following relation from thermodynamics:
Q = mcΔT
Where:
Q is the heat energy transferred (in Joules)m is the mass of the substance (in kilograms)c is the specific heat capacity (in J/kg°C)ΔT is the change in temperature (in °C)For ice, the specific heat capacity (c) is approximately 2.09 J/g°C or 2090 J/kg°C. Plugging in the values, we have:
50,200 J = m × 2090 J/kg°C × 8°C
Solving for m:
m = 50,200 J / (2090 J/kg°C × 8°C) = ≈ 3.01 kg
Therefore, the mass of the block of ice is approximately 3.01 kg.
The landform pictured above has been growing taller from one year to the next. The picture shows
A.
a sand dune that has been formed by erosion
B.
a sand dune that has been formed by deposition.
C. a mountain that has been formed by crustal uplift.
D.
a mountain that has been formed by plate folding.
Answer:
a sand dune that has been formed by deposition.
Explanation:
The landform pictured above has been growing taller from one year to the next year. The picture shows a sand dune that has been formed by deposition. Thus, the correct option is B.
What are Sand dunes?When the desert winds blow in a particular direction, they carry a lot of sand all around with them. When the wind stops blowing, this sand falls on the land and gets deposited. These deposits look like the little hills or mounds, which are called as the sand dunes.
Sand dunes are usually temporary structures as the next gust of wind can shift them to another place from the actual location where they formed.
Sand dunes are mostly associated with deserts, can be found in the region of deserts.
Therefore, the correct option is B.
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1.
A poorly tuned Yugo can accelerate from rest to a speed of 28 m/s in
20 s.
a) What is the average acceleration of the car?
b) What distance does it travel in this time?
Explanation:
Average acceleration is defined as the rate of change of velocity to the rate of change of period. Change of velocity refers to the difference between final velocity and initial velocity. The unit of acceleration is meter/sec/sec (or) m s^2.
Avg Acceleration=(Final velocity - Initial velocity) /(Final time - Initial time)
a. To find the average acceleration of the car, (initial velocity and initial time is 0, the final velocity is 28 m/s, final time = 20 s)
Avg acceleration of the car = (28 - 0) / (20 - 0)
= 28 / 20 = 1.4 m / s^2.
b. The distance traveled is given by the product of speed and time
Distance traveled = Speed * Time
The Distance traveled by the car = 28 * 20 = 560 m.
By applying basic physics formulas, the car's average acceleration can be determined as 1.4 m/s², and the distance it travels in 20 seconds is 280 meters.
Explanation:To answer this question, you'll need to apply basic physics formulas. Let's go step by step:
a) What is the average acceleration of the car?
Acceleration is defined as the rate of change of velocity per unit of time. The formula is Acceleration = (Final speed - Initial speed) / Time. Here, the initial speed is 0 (because the car is starting from rest), final speed is 28 m/s and time is 20 s.
So, Acceleration = (28 m/s - 0) / 20 s = 1.4 m/s². That's your answer for part a.
b) What distance does it travel in this time?
The distance traveled by the car can be found using the formula of linear motion: Distance = Initial speed x Time + 0.5 x Acceleration x Time². Since the car starts from rest, the initial speed is zero, and this component of the formula will be zero.
So, Distance = 0 + 0.5 x 1.4 m/s² x (20 s)² = 280 m. So, the car travels 280 meters in that time.
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The inside surface of the glass inside a vacuum bottle is coated with aluminum to prevent heat loss by ____.
Answer:
radiation
Explanation:
What is the IMA of a lever whose resistance arm is 7cm long if the effort arm is 0.7m long and the load is 8.5N?
The IMA of the lever is 10
Explanation:
The IMA (Ideal Mechanical Advantage) of a simple machine is given by:
[tex]IMA=\frac{d_e}{d_r}[/tex]
where
[tex]d_r[/tex] is the length of the resistance arm
[tex]d_e[/tex] is the length of the effort arm
For the lever in this problem, we have:
[tex]d_r = 7 cm = 0.07 m[/tex] is the length of the resistance arm
[tex]d_e = 0.7 m[/tex] is the length of the effort arm
Substituting into the equation, we find the IMA of the lever:
[tex]IMA=\frac{0.7}{0.07}=10[/tex]
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Which type of change occurs when the bonds between atoms or molecules change and a new substance forms?
A: Permanent
B: Nuclear
C: Chemical
D: Physical
Answer:
C: Chemical
Hope this help !!!!
C. Chemical
~Sarah Robinsen
6.
What is the speed of a rocket that travels 9000 meters in 12.12 seconds?
Answer:
742.57 m/s
Explanation:
Given:
Distance travels by a rocket = 9000 metres
Time taken by rocket = 12.12 seconds
Questioned asked:
Speed of rocket = ?
Solution:
By applying formula, speed = distance traveled divided by time taken
[tex]speed = \frac{distance}{time} \\ = \frac{9000}{12.12} \\ = 742.57m/s[/tex]
Therefore, the speed of a rocket that travels 9000 meters in 12.12 seconds is 742.57 meters per seconds.
what are 2 examples of levers
Answer:
Some examples of levers include more than one class, such as a nut cracker, a stapler, nail clippers, ice tongs and tweezers. Other levers, called single class levers include the claw end of a hammer.
Explanation:
Answer:
Some examples of levers include more than one class, such as a nut cracker, a stapler, nail clippers, ice tongs and tweezers. Other levers, called single class levers include the claw end of a hammer.
Explanation:
A stunt man is attempting to ride his bike through the loop of a track. The
combined mass of the stunt man and his bike is 101 kg. (a) If the radius of
the loop is 10.1 m and he is traveling at 22.5 m/s, what is the normal force
from the track when he is at the top of the loop?
(b.) What is the minimum speed the stunt man can be traveling and still
make the loop?
Answer:
(a) 4070 N
(b) 9.95 m/s
Explanation:
(a) Draw a free body diagram of the stunt man when he is at the top of the loop. There are two forces: normal force N pushing down and weight force mg pulling down.
Sum of forces in the radial (-y) direction:
∑F = ma
N + mg = m v² / r
N = m v² / r − mg
N = (101 kg) (22.5 m/s)² / (10.1 m) − (101 kg) (9.8 m/s²)
N = 4070 N
(b) At the minimum speed, there is no normal force at the top of the loop.
∑F = ma
mg = m v² / r
g = v² / r
v = √(gr)
v = √(9.8 m/s² × 10.1 m)
v = 9.95 m/s
A 5.5 kg box is pushed across the lunch table. The net force applied to the box is 9.7N. What is the acceleration of the box?
Answer:
1.76 m/s^2
Explanation:
mass of box, m = 5.5kg
net force , F = 9.7N
acceleration = ?
F = m x a
a = F/m = 9.7/5.5
a = 1.76 m/s^2
An advantage of parallel circuits is that A. it is the simplest type of circuit to make. B. electrons can only take one path, so the flow of energy is always known. C. if one part of the circuit is not working, the other parts can still work. D. when one part of the circuit breaks, the whole circuit must be replaced.
Answer:
The answer is c
Explanation:
if a swimmer is traveling at a constant speed of 0.85 m/s how long would it take to swim the length of 50 meter olymic sized pool
Answer:
58.82 Seconds
Explanation:
50m/0.85m/s=58.82s
A uniform brick of length 18 m is placed
over the edge of a horizontal surface with a
maximum overhang of 9 m attained without
tipping.
K18 m
Now two identical uniform bricks of length
18 m are stacked over the edge of a horizontal
surface.
K18 m
What maximum overhang is possible for
the two bricks (without tipping)?
Answer in units of m.
Answer:
13.5
Explanation:
x= Length
.5 = Center Point
x=0.5(9)= 4.5
So total length over the edge will be given as
Length (L) =9+4.5=13.5
The maximum overhang for two uniform bricks of length 18 m each, when stacked, is 13.5 m. This is determined by considering the center of mass and static equilibrium of the bricks.
Explanation:The question involves the concept of static equilibrium and center of mass in the field of physics. When two uniform bricks of length 18 m are stacked and placed such that they overhang the edge of a surface, the maximum overhang is achieved when the center of mass of the system is still supported by the surface. To find the maximum overhang for two bricks, we can apply the principle of moments. For two stacked bricks, the bottom brick can overhang by half its length, namely 9 m. The top brick can be shifted further out but must keep its center of mass over the bottom brick. The maximal overhang of the second brick is therefore half of what remains from the first brick, which is ½ × 9 m = 4.5 m. Hence, the maximum overhang for the top brick is 4.5 m beyond the end of the bottom brick, which itself overhangs by 9 m. Consequently, the total maximum overhang for two stacked bricks is 13.5 m.
A baseball player runs 27 m from third base to home plate in 3.2 s. What is
his average velocity?
Answer:
8.4375m a second
Explanation:
Again, this is such an easy question that I see everywhere. The way to figure this out is to divided the total distance he or she covered, which was 27m, by the time it took him or her to do so, which was 3.2s, so the equation is 27 divded by 3.2 which is 8.4375.
Hope this helps and have a great day.
Answer:
8.44 m/s
Explanation:
Averag v = distance/time
= 27m/3.2s
= 8.44 m/secs
Why should antibiotics be given to a person who is ill with a bacterial disease like strep throat, but NOT to a person who has a viral disease like measles?
Antibiotics kill bacteria but not viruses.
Antibiotics make viruses grow faster.
Antibiotics are made by viruses.
Viruses are not living things.
If you guys dont mind can you please help me with this one
Answer:
b
Explanation:
antibiotics are made with viruses so that ou body can get immune to the virus
Find the current passing through a circuit consisting of a battery and one resistor. The resistance has a retance of 2ohms and the battery hasa voltage of 12 volts
The current passing through a circuit consisting of a battery of 12 V and resistor of 2 ohms is 6 Ampere .
Explanation:
Assume the wires are ideal with zero resistance. The current passing through the circuit will beI = V/R = 12/2 = 6.000 A.
What type of mixture is salad dressing?
Answer:
Heterogeneous Mixture
Explanation:
Heterogeneous by definition is when two different substance are mixed together, but they are not evenly distributed. In this case, the salad dressing is a Heterogeneous Mixture, for the dressing does not mix completely evenly throughout the salad.
~
Thus, an object with a momentum of 0 (does or does not have
kinetic energy.
If an object has a momentum of 10 it (does or does not) have
kinetic energy.
How do you know?
Answer:
At momentum zero, kinetic energy = zero
At momentum 10, kinetic energy can never be equal to zero.
Explanation:
An object is said to have zero momentum when either its mass or its velocity is zero. Since, negetive mass doesn't exist, the velocity should be zero and this case, the object must be at rest. Momentum is zero when change in velocity is zero, but kinetic can never be zero when body is motion or has a momentum of 10.
A clay ball with a mass of 0.50 kg is traveling at 5.7 m/s to the right and hits another clay ball that has a mass of 0.50 kg which is at rest. The two clay balls stick together and move as one. What is the velocity of the two balls?
Answer:
2.9 m/s to the right
Explanation:
Momentum before = momentum after
m₁ u₁ + m₂ u₂ = (m₁ + m₂) v
(0.50 kg) (5.7 m/s) + (0.50 kg) (0 m/s) = (0.50 kg + 0.50 kg) v
v = 2.85 m/s
Rounded to two significant figures, the velocity is 2.9 m/s to the right.
If you wanted to be an auto mechanic for Toyota, where would you go to school to get that training? How much would you make your first year?
Which kind of intelligence involves is the ability to hear pitch, tone, and rhythm?
Answer:
musical intelligence
Explanation:
Find the statement about Fusion that is false. Group of answer choices
A) Fusion releases less energy than fission.
B) Fusion is extremely difficult to contain and maintain here on earth.
C) Fusion occurs when low mass nuclei, such as hydrogen collide and combine to form nuclei with greater masses.
D) fusion most commonly combines heavy isotopes of hydrogen into helium.
E) Fusion could be the world's answer to clean unlimited amounts of energy.
A) Fusion releases less energy than fission.
Explanation:
Nuclear fusion is a process in which nuclei of light elements combine together into heavier elements; in the process, the mass of the final nucleus is less than the total mass of the initial nuclei, therefore energy is released during the reaction.
Nuclear fusion is able to liberate a huge amount of energy, according to the famous Einstein's equation:
[tex]E=mc^2[/tex]
where
E is the energy released
m is the mass converted into energy in the process
c is the speed of light
Let's now analyze the statements given:
A) Fusion releases less energy than fission. --> FALSE. In fact, fusion releases much more energy than fission.
B) Fusion is extremely difficult to contain and maintain here on earth. --> TRUE. In order for fusion to occur, the initial nuclei must overcome the electrostatic repulsion between them in order to come very close to each other, within the range of action of the strong force; for this to happen, the temperature and the pressure must be enormous, and this makes fusion difficult to occur on Earth.
C) Fusion occurs when low mass nuclei, such as hydrogen collide and combine to form nuclei with greater masses. --> TRUE
D) fusion most commonly combines heavy isotopes of hydrogen into helium. --> TRUE, this is the most common reaction that occurs within the core of the stars
E) Fusion could be the world's answer to clean unlimited amounts of energy. --> TRUE: energy from fusion is a clean source of energy (there is no radioactive waste) and virtually unlimited, since it can be produced starting from hydrogen.
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How can electric shock be prevented?
Wearing rubber or stay away from water or/ and a conductor
A football player kicks a 0.94 kg football with a force of 2.4 N.
Calculate the acceleration of the football as the player kicks the ball. Round your answer to the nearest tenth of a m/s2.
The acceleration of the football is
m/s2.
Answer:
The Answer is 2.6m/s(m/s)
Explanation:
Just took the test!
Answer:
2.6 m/s2............................
You are at an office party, a holiday party, or a gathering of friends at the home of a neighbor and you are engaged in conversation with a friend in a discussion. More people are talking behind you, but you are not paying attention to their conversation. Suddenly, you hear your name mentioned by one of the individuals engaged in the conversation behind you. You become unable to concentrate on the discussion, because you are too busy trying to hear what the other people are saying about you. You know you were not deliberately eavesdropping on this conversation, but you know that you heard your name. Is it possible that you were unconsciously eavesdropping?
The correct answer is; Yes, you can be unconsciously eavesdropping.
Further Explanation:
When this occurs it is called the “The Cocktail Party Phenomenon.” Your mind can focus on one conversation that is being made and drown out all other speech and things going on around you. This makes your brain have auditory attention on one specific conversation.
The sensory hearing in the person listening to the conversation is subconsciously filtering the conversation into its own stream in the brain. This phenomenon can also detect certain words that are important to the person with a large amount of noise in the background.
This occurs in the left hemisphere of the brain in the superior temporal gyrus region.
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Final answer:
The experience you described is related to the cocktail party effect, a part of selective attention that allows us to focus on a conversation even in a noisy environment, while still unconsciously monitoring other auditory channels, including hearing one's own name.
Explanation:
Cocktail Party Phenomenon and Selective Attention
The situation you described typically relates to the cocktail party effect, which is a well-documented phenomenon in psychology. This effect explains how people can focus on a specific conversation in a noisy environment yet still notice when something salient, like their name, is mentioned elsewhere. It's a part of selective attention, allowing us to concentrate on a single source of input while still unconsciously monitoring other channels. The information overload at events such as parties necessitates this filtering mechanism, where our brains process background conversations without our active awareness. When your name is mentioned, it becomes a significant stimulus that captures your attention, indicating that some unconscious eavesdropping may occur as a byproduct of this natural cognitive process.
As mentioned by Broadbent (1958) and Cherry (1953), selective attention is not a complete exclusion of all background noise; it's a delicate balance that allows for focus while still keeping us connected to our surroundings. This phenomenon shows that even when you're engaged in conversation, you're unconsciously monitoring the environment around you, including the speech of others. Your brain is attending to more than you might realize, as it sifts through various sensory inputs to alert you to anything important—like the mention of your name.
1) Differences between Magnetic Induction and Demagnetization
2) A freely suspended bar magnet always shows north-south direction. Why?
3) A magnet has stronger force of attraction at the poles than in the middle. Why?
Please guys answer those questions in less than 24 hours.
I really need this answer.
1)
Magnetic Induction is the process by which an object is magnetized by an external magnetic field.
Demagnetization is the process of removing magnetism from an object.
Explanation:
Magnetism is the property of a material to exert a notice magnetic force on anything that is electrically or magnetically charged. Ferromagnetic substances like iron can be magnetized permanently by putting them in an external magnetic field. These materials retain their magnetic properties up to a certain temperature, called the Curie point.
Demagnetization is the process of decreasing the magnetic properties of ferromagnetic materials by heating it past the Curie point, applying a strong magnetic field, applying alternating current, or hammering the metal. Demagnetization occurs naturally over time.
Keywords: magnetism, magnetic induction, demagnetization, Curie point, ferromagnetic.
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2)
A freely suspended magnet always show north-south direction because Earth also shows magnetism.
Explanation:
Earth's magnetic field is similar to that of a bar magnet so it also have two poles; the south pole and the north pole. So when a bar magnet is freely suspended, it arranges itself in such a way that its north pole points towards the south pole of Earth and its south pole points towards the north pole of Earth. Because opposite poles attracts each other.
The south pole of earth's magnet is in geographical north because it attracts the north pole of suspended magnet . Similarly , the north pole of earth's magnet is in geographical south because it attracts the south pole of the suspended magnet . Hence, the suspended bar magnet shows north-south direction.
Keywords: north pole, south pole, magnet, Earth, bar magnet.
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3)
A magnet has stronger force of attraction at the poles than in the middle because the magnetic field lines of a bar magnet are closer at the poles while they almost vanish in the middle comparatively.
Explanation:
Magnetic field lines are used to represent the magnetic field around a magnet. Magnetic field lines are continuous, forming closed loops without beginning or end. They go from the north pole to the south pole. The direction of the magnetic force is tangent to the magnetic field line at that point.
The strength of the magnetic force is directly proportional to the density of the magnetic field lines. Hence, the magnetic force is stronger near the poles and weakens in the middle.
Keywords: magnetic field lines, poles, magnetic force.
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In a hydraulic system, why is the force exerted on a small piston multiplied when it acts on a larger piston?
The force multiplies because of Pascal's law .
Explanation:
Pascal's law states that " when there is an increase in pressure at any point in a confined fluid, there is an equal increase at every other point in the container". So, in a hydraulic system where it is a confined fluid system, where the dimensions of two sides are very different, due to it there is an increased amount of force.
how many neutrons are in calcium
Answer:
I believe there are 20 Neutrons in Calcium.
Explanation:
Final answer:
Calcium has several isotopes, with calcium-40 being the most common and containing 20 neutrons. The number of neutrons in an isotope of calcium can be found by subtracting the atomic number (20) from its mass number. Other isotopes like calcium-48 contain 28 neutrons.
Explanation:
To determine how many neutrons are in calcium, we look at its atomic number (Z) and its mass number (A). Calcium's atomic number is 20, which means it has 20 protons.
The most common isotope of calcium is calcium-40, which has a mass number of 40. To find the number of neutrons, we subtract the atomic number from the mass number:
Neutrons = Mass number - Atomic number = 40 - 20 = 20 neutrons
Therefore, calcium-40 contains 20 neutrons. There are other isotopes of calcium as well, such as calcium-48, which has 28 neutrons, and it is characterized by a half-life of about 2×10¹⁶ years, making it relatively stable.
When calcium forms a cation, such as Ca²⁺, it still retains its 20 protons and the number of neutrons does not change due to electron gain or loss. The resulting ion would have 18 electrons and carry a +2 charge.
A 5 kg book rests on a table. How much force is it exerting on the table?
(Hint: think about acceleration due to gravity.)
Answer:
49N
Explanation:
Basically, think of this problem as asking how much the book weighs, as that is all weight is, how much force you exert on whatever surface you're on.
Thus, the force due to gravity Fgrav = mg = 5 * 9.8m/s^2 = 49N.
The force will be "49 N". A complete solution is provided below.
According to the question,
Mass of books,
m = 5 kg
We know the value,
g = 9.8 m/s⁻¹
Now,
The force exerting on the table, will be:
→ [tex]F = mg[/tex]
By substituting the given values in the above formula, we get
→ [tex]=5\times 9.8[/tex]
→ [tex]=49 \ N[/tex]
Thus the above answer is correct.
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