If a 375 mL sample of water was cooled from 37.5 C to 0 C how much heat was lost in joules?
What are the products of the double-replacement reaction between potassium bromide and silver nitrate? Name the resulting compound(s) (2 Points)
Explanation:
A double replacement reaction is a reaction in which two different compounds are mixed together and both their cations and anions get exchanged with each other respectively.
When potassium bromide reacts with silver nitrate then it results in the formation of potassium nitrate and silver bromide.
The chemical reaction equation is as follows.
[tex]KBr + AgNO_{3} \rightarrow KNO_{3} + AgBr[/tex]
As an object moves along the x axis, many measurements are made of its position, enough to generate a smooth, accurate graph of x versus t. Which of the following quantities for the object cannot be obtained from this graph alone? (Select all that apply.)
the displacement during some time interval
the speed at any instant
the velocity at any instant
the average velocity during some time interval
the acceleration at any instant
Answer:
the acceleration at any instant
Explanation:
1). the displacement during some time interval
We can determine the displacement of the object from the graph because we know that displacement is defined as the change in position of the object and from graph change in position can be obtained easily
2). the speed at any instant
3). the velocity at any instant
speed at any instant of time and velocity at any instant of time must be same in the magnitude and we can determine it by the slope of the graph
As we know that instantaneous velocity is defined as
[tex]v = \frac{dx}{dt}[/tex]
so slope of the graph at any instant will give an idea about instantaneous speed of velocity
4). the average velocity during some time interval
To find average velocity we need the displacement of object at a given interval of time and ratio of this displacement and time interval is known as average velocity
So we can find it from graph
5). the acceleration at any instant
To find the instantaneous acceleration we need to find
[tex]a = \frac{dv}{dt}[/tex]
this is not possible to find from x-t graph because in order to find this slope we need to find velocity time graph.
_______ is the worst way to protect ourselves from the sun's harmful rays.
Sunglasses
Only going outside when it is cloudy
Long-sleeved shirts
Sunscreen
12,000 scientific notation
Answer:
1.2 x 10^4
10^4 is 10,000
If the equation of motion of a particle is given by s = B cos(ωt + δ), the particle is said to undergo simple harmonic motion.
(a) Find the velocity of the particle at time t.
(b) When is the velocity 0?
What must be true of an object that has gravitational potential energy?it is stretched beyond a certain length.it is above a reference point.it is compressed shorter than a given length.it is moving past a reference point.
Answer:
b on edg
Explanation:
Electrical wires sometimes have a plastic coating wrapped around them. How does this make the wires safer to handle
Plastic coating around electric wires are for safe use because plastic is an insulator and does not allow the current to flow.
What is plastic coating?The plastic coating is just the dipping or immersion of liquid polymers including plastic on the surface of an object.
What are insulators ?Insulators are the substances in which electric current can not flow, actually these substances have no free electrons , these are also known as bad conductors , for example: rubber , plastic , cotton , silk , wool ,PVC , wood etc.
Hence plastic coating is wrapped around electric wire for insulation.
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Which words in the sentence are the main and auxiliary verbs? Greg does not like cauliflower. A. does not like B. does not C. not like D. does like
If the current flowing through an electric heater increases from 6 to 12 amp while the voltage remains the same, the heat produced by the heater will be
a. reduced one-half.
c. two times the original heat.
b. unchanged.
d. four times the original heat.
Explanation:
It is given that,
Current, [tex]I_1=6\ A[/tex]
Heat produced, [tex]H_1=I_1^2Rt[/tex]............(1)
Where
R is the resistance
t is the time taken
So, [tex]H_1=36Rt[/tex]
Current, [tex]I_2=12\ A[/tex]
Heat produced, [tex]H_1=I_2^2Rt[/tex]
So, [tex]H_2=144Rt[/tex].............(2)
From equation (1) and (2), it is clear that
[tex]H_2=4\times H_1[/tex]
So, If the current flowing through an electric heater increases from 6 to 12 amp while the voltage remains the same, the heat produced by the heater will be four times the original heat.
what do all types of waves on the electromagnetic spectrum have in common
All electromagnetic waves are transverse waves and can travel through a vacuum. They travel at the same speed in a vacuum just like light, 300,000,000 m/s.
What are electromagnetic waves?Electromagnetic radiation (EMR) is comprised of electromagnetic (EM) field wave propagates through space transporting electromagnetic radiant energy.
Radio waves, microwaves, infrared, visible light, ultraviolet, X-rays, and gamma rays are all examples of these. These waves are all part of the electromagnetic spectrum.
All waves are transverse waves that can travel through vacuum.
Thus, this factor is common in all types of waves in electromagnetic spectrum.
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Sediment laid down by glacial meltwater is called
Answer:
Stratified drift
Explanation:
A rock that is different in size and type when compared to the rocks that are native to the region is called a glacial erratic.
When there is an accumulation of glacial debris that is unconsolidated which occur in currently and formerly glaciated regions on Earth and is glacially formed is called morraine. Ground morraine's are deposited by glacier retreats.
Stratified drift is the type of drift caused by deposits from glacial melt-water.
An outwash plain is formed by glacial sediments deposited by melt-water outwash.
Complete the following statement: today, the standard unit of time is defined in terms of
Today, the standard unit of time is defined in terms of electromagnetic waves emitted by cesium atoms. The correct option is A.
What are electromagnetic waves?In physics, electromagnetic radiation is made up of electromagnetic field waves that travel through space carrying electromagnetic radiant energy.
Radio waves, microwaves, infrared, light, ultraviolet, X-rays, and gamma rays are all examples of electromagnetic waves. These waves are all part of the electromagnetic spectrum.
Because of their oscillating electric and magnetic fields, energy waves are referred to as electromagnetic (EM).
Scientists categorize them based on their frequency or wavelength, from high to low frequency, short to long wavelength.
The second is the duration of 9,192,631,770 radiation periods corresponding to the transition between the two hyperfine levels of the cesium 133 atom's ground state.
Thus, the correct option is A.
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Your question seems incomplete, the missing options are:
(a) the electromagnetic waves emitted by cesium atoms.(b) the motion of the moon around the earth.(c) the motion of a precision pendulum.(d) the average solar day.if the opposite a 45 degree angle in the right triangle equals 12.5 meters, how long is the side adjacent to the angle
Tim and Rick both can run at speed vr and walk at speed vw, with vr>vw. They set off together on a journey of distance D. Rick walks half of the distance and runs the other half. Tim walks half of the time and runs the other half.
Part A
How long does it take Rick to cover the distance D?
Express the time taken by Rick in terms of vr, vw, and D.
Part B
Find Rick's average speed for covering the distance D.
Express Rick's average speed in terms of vr and vw.
Part C
How long does it take Tim to cover the distance?
Express the time taken by Tim in terms of vr, vw, and D.
Answers:
Part A: T = [ D/2 ] [ 1 / Vr + 1 / Vw) ]
Part B: Average speed = 2 × Vr × Vw / [ Vr + Vw ]
Parte C: T = 2 D / [Vr + Vw]
1) Variables:
D = total distance
Dr = run distance
Dw = walk distance
Vr = run speed
Vw = walk speed
T = total time
Tr = run time
Tw = walk time
2) Formulas:
i) velocity = distance / time
ii) distance = velocity × time
iii) time = distance / velocity
iv) Average speed = total distance / total time
3) General table:
person---------- run ------------ walk
RicK-------------- D/2------------- D/2
Tim -------------- T /2 ------------- T /2
4) Part A. How long does it take Rick to cover the distance D?
i) T = Tr + Tw
ii) Tr = Dr / Vr
iii) Dr = D / 2
⇒ Tr = [D/2] / Vr = D / [ 2Vr]
iv) Tw = [D/2] / Vw = D / [2Vw]
v) T = Tr + Tw = [D / 2] × [ 1 / Vr + 1 / Vw ]
T = [ D/2 ] [ 1 / Vr + 1 / Vw) ] ← answer
5) Part B. Find Rick's average speed for covering the distance D.
Average speed = D / T = D × 1 / T = D × [2 / D] × [Vr×Vw] / [Vr + Vw]
Average speed = 2 × Vr × Vw / [ Vr + Vw ]
5) Part C How long does it take Tim to cover the distance?
i) Tr = Dr / Vr = T / 2 ⇒ Dr = Vr × T /2
ii) Tw = Dw / Vw = T / 2 ⇒ Dw = Vw × T /2
iii) ⇒ D = Dr + Dw = Vr × T / 2 + Vw × T / 2
⇒ D = [Vr + Vw] × T / 2
iv) ⇒ T = 2 D / [Vr + Vw] ← answer.
Which of the following concepts underlies all the others: electron affinity, ionization energy, effective nuclear charge, atomic size?
If a 0.20 kg object fell 7.0 Meters before it hitting the ground, what was it's change in Potential Energy during the fall?
Fill in the blank: energy can never be created nor destroyed just _ or _
a ball has a mass of 140 g. what is the force needed to accelerate the ball at 25 m/s2?
Answer:
3.5
Explanation:
One liter of alcohol in a flexible container is carried to the bottom of the sea, where the pressure is 2.6x10^6 N/m^2. What will be its new volume?
Final answer:
According to Boyle's law, the new volume of the alcohol in the flexible container at the bottom of the sea can be calculated using the equation V1P1 = V2P2, where V1 is the initial volume, P1 is the initial pressure, and P2 is the new pressure. By substituting the given values, we find that the new volume is 3.846x10⁻⁷ m³.
Explanation:
According to Boyle's Law, the volume of gas is inversely proportional to the pressure when the temperature is held constant. Therefore, we can use the equation V1P1 = V2P2 to find the new volume. Let's substitute the given values into the equation:
V1 = 1 L
P1 = atmospheric pressure = 1 atm
P2 = 2.6x10⁶ N/m²
Solving for V2, we have:
V2 = (V1 x P1) / P2
V2 = (1 L x 1 atm) / (2.6x10⁶ N/m²)
V2 = 3.846x10⁻⁷ m³
Therefore, the new volume of the alcohol in the flexible container at the bottom of the sea is 3.846x10⁻⁷ m³.
Which one of the following scenarios accurately describes a condition in which resonance can occur?
A.) vibrating tuning fork is struck and begins to vibrate as the object used to strike it is placed away from the tuning fork.
B. ) A pipe's length is equal to 1⁄2 of the wavelength of the sound waves produced by a tuning fork vibrating over one end of the pipe that's open to the air at both ends.
C.) A person is holding a tuning fork on one end of a football field and another person is holding a separate tuning fork on the opposite end of the field.
D.) A column of air has a height equal to 1⁄8 of the wavelength of the sound waves produced by a tuning fork vibrating over the column of air in an open pipe that's partially immersed in water.
Answer:
B. ) A pipe's length is equal to 1⁄2 of the wavelength of the sound waves produced by a tuning fork vibrating over one end of the pipe that's open to the air at both ends.
Explanation:
Resonance is a phenomenon in which a vibrating body causes another body to vibrate at a specified frequency (or wavelength) with greater amplitude. Resonance also occurs in the following situations;
i. Swinging of a pendulum
ii. Plucking a string in an acoustic guitar
iii. Pushing of a playground swing at a regular interval
Why are the action and reaction forces described by Newton’s third law of motion excluded in the free-body diagram of an object?
A. They are equal and opposite, so they cancel one another.
B. They act on different objects, so they would not appear together.
C. They are in opposite directions, so only one would appear.
D. They do not happen at the same time, so only one would appear.
The correct answer is:
B. They act on different objects, so they would not appear together.
Let's take for example a box sitting on a table. If we draw the free-body diagram of the box, we would draw two forces:
- the weight of the box (downward)
- the normal reaction of the table on the box (upward)
However, this is not a pair of action-reaction forces as described in Newton's third law. In fact, the correct action-reaction pair would be:
- weight of the box (=gravitational force exerted by the Earth on the box)
- gravitational force exerted by the box on the Earth
We see that these two forces act on two different objects (the first one on the box, the second one on the Earth), so they do not appear in the same free-body diagram.
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A ship is heading due north at 12 mph. The current
is flowing southwest at 4 mph. Find the actual bearing and speed
of the ship.
A ship is heading due north at 12 mph. The current is flowing southwest at 4 mph. the actual bearing and speed of the ship is 9.5 mph.
What is Speed ?Speed is a rate of change of distance with respect to time. i.e. v=dx÷dt. Speed can also be defined as distance over time i.e. speed= distance ÷ time it is denoted by v and its SI unit is m/s. it is a scalar quantity. Speed shows how much distance can be traveled in unit time. To find dimension for speed is, from formula Speed = Distance ÷ Time.
Dimension for distance is [L¹] ,
Dimension for Time is [T¹],
Dividing dimension of distance by dimension of time gives, [L¹] ÷ [T¹] = [L¹T⁻¹] Dimension for speed is [L¹T⁻¹].
Given,
Speed of the ship in north direction v' = 12 mph
Speed of the current in south west direction v" = 4 mph
magnitude of the resultant speed,
v² = v'² + v"² + 2v'v''cosθ
v² = 12² + 4² + 2×4×12 cos135
v = 9.5 mph
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In about 5 billion years, at the end of its lifetime, our sun will end up as a white dwarf, having about the same mass as it does now, but reduced to about 15,000 km in diameter.What will be its density at that stage?
...?
Finish the following sentence. almost all of the oxygen (o2) one consumes in breathing is converted to _____________.
Almost all of the oxygen consumed during breathing is converted to carbon dioxide and water. Oxygen is transported by hemoglobin in the blood to body tissues, where it is used for metabolism, and carbon dioxide is transported back to the lungs to be exhaled.
Explanation:Almost all of the oxygen (O2) one consumes in breathing is converted to carbon dioxide (CO2) and water (H2O). In the body, oxygen is used by cells in a process called cellular respiration, where it is the final electron acceptor in the electron transport chain. The oxygen is used to oxidize nutrients, like glucose, to produce energy for the cells in the form of adenosine triphosphate (ATP). The oxidation of nutrients leads to the production of carbon dioxide and water as waste products, which are excreted from the body.
Oxygen is transported from the lungs to the tissues primarily through the binding with hemoglobin in red blood cells. As the blood passes through the body's tissues, oxygen is released from the hemoglobin and moves into the cells, where it is used for cellular metabolism. The carbon dioxide produced as a result of this metabolism is then carried back to the lungs via the blood, where it is expelled from the body through exhalation.
at 1 kilometer per year , how many centuries would it take for people to move from africa to china which is 10,000 kilometers away-
One function of the skeletal system is to protect the internal organs.
true/false
True, the skeletal system does protect internal organs, in addition to providing support, allowing for movement, producing blood cells, and storing minerals and fats.
Explanation:True, one function of the skeletal system is indeed to protect internal organs. The skeletal system encompasses bones, cartilage, and ligaments that together provide not only support and shape to the body but also serve crucial protective functions. For example, the skull encases and safeguards the brain, the vertebral column shields the spinal cord, and the rib cage, composed of the ribs, sternum, and associated cartilage, ensures the safety of the heart and lungs, allowing for necessary movements like breathing.
The skeletal system not only protects internal organs but also has several other functions which include supporting the body, facilitating movement through its connection with muscles, and serving as a site for blood cell production. It also acts as a reservoir for minerals and helps in storing and releasing fats. This multifaceted system is essential for the overall functionality of the human body.
A boat travels in a straight path that is 25° west of north. Which describes the values of the west and north components of the boat’s displacement?
Explanation:
It is given that, a boat travels in a straight path that is 25° west of north. Let W and N is the component of the boat’s displacement due west and north directions.
The west component is equal to [tex]W\ cos\theta[/tex] and the north component is equal to [tex]N\ sin\theta[/tex]. According to Cartesian coordinate system, west is negative x direction and north is positive y direction.
So, the west component is a negative number and the north component is a positive number.
Ganymede is one of the many moons of jupiter. it is nearly a sperical in shape. it is larger than the planet mercury and slightly smaller than the planet mars. if it is so large compared with the bodies around it, why is it called a moon and not a planet?
According to ohms law what is the resistance of a light bulb if the applied voltage is 9.0v and the current is 0.30 amps