A 1.2-kg hot iron sphere with heat capacity
576 J °C-1 is cooled by immersing it in a tank of
water (Fig g). (See the photo that I uploaded)The mass of the water is 3 kg and
its initial temperature is 12 °C. After 5 minutes,
both the iron sphere and the water reach a final
temperature of 15 °C.
(a) Find the energy gained by the water.
(b) Find the average rate of energy transfer from
the iron sphere to the water.
(c) What is the initial temperature of the iron
sphere?
Answers
Given the data from the question, the heat gained by the water, the rate of energy transfer and the initial temperature of the iron are:
A. The energy gained by the water is 37656 J
B. The average rate of energy transfer from
the iron sphere to the water is 125.52 J/s (Watts)
C. The initial temperature of the iron
sphere is 65.4° C
A. How to determine the heat gained Mass of water (M) = 3 Kg = 3 × 1000 = 3000 gInitial temperature (T₁) = 12 °C Final temperature (T₂) = 15 °Change in temperature (ΔT) = 15 – 12 = 3 °C Specific heat capacity (C) = 4.184 J/gºC Heat (Q) =?Q = MCΔT
Q = 3000 × 4.184 × 3
Q = 37656 J
B. How to determine the rate of energy transfer Heat (Q) = 37656 JTime (t) = 5 min = 5 × 60 = 300 sPower (P) =?Power = energy / time
Power = 37656 / 300
Power = 125.52 J/s (Watts)
C. How to determine the initial temperature of the iron Mass of iron (M) = 1.2 Kg = 1.2 × 1000 = 1200 gHeat capacity (C) = 576 J/ºC Heat (Q) = 37656 JTemperature (T) =?Q = CT
37656 = 576 × T
Divide both side by 576
T = 37656 / 576
T = 65.4° C
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Related Questions
A 2.0-kilogram ball rolls down a ramp. if the ball accelerates at a rate of 12 m/s2, the net force causing the acceleration is:
a:6 newtons
b:10 newtons
c:12 newtons
d:24 newtons
Answers
Answer:
D
Explanation:
f = ma
2 x 12 = 24
answer could differ since it's rolling down a ramp. if an angle is given our approach differs.
Why is a 1 solar-mass red giant more luminous than a 1 solar-mass main sequence star?.
Answers
Answer:
No
Explanation:
I dont know please help
A distant star gives off a visible range of light whose color depends on its temperature. Which model of light does this example support? O A. The interference model B. The particle model O C. The diffraction model OD. The wave model
Answers
The statement 'a distant star gives off a visible range of light whose color depends on its temperature' is supported by the wave model.
What is wavelength?The wavelength can be defined as the periodic distance of a given wave that repeats in a constant way.
The emissivity of particles is a function of both wavelength and temperature of a given material/object. Visible wavelengths range from 700 nm to 400 nm (violet color).
Star temperature largely determines its color, blue stars are warmer than yellow and red stars, and red stars are cooler than yellow stars.
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PLEASE HELP ASAP
1) During a transformation, a positive radon nucleus repels a positive helium nucleus
(m = 6.64 × 10–27 kg), giving it an energy of 7.37 × 10–13 J. How fast is the helium
nucleus moving when it is far away from the radon nucleus? Draw an energy bar chart
to assist you.
2) A positive charge of +7.2 μC and a positive charge of +6.64 μC are 10 cm apart, at
rest. After t seconds, the particles are at a distance 15 meters apart with velocities
–8.7 m/s and 9.1 m/s, respectively. Draw an energy bar chart of the situation and
determine the direction of the forces and velocities of each charge.
Answers
Which of these circuits has a voltmeter?
O
(A)
(B)
(C)
(D)
(E)
ОА А
OBB
Ос. с
ODD
О Е Е
Answers
Answer:
I think is o or mavey it could be D
You just explored speed. Now test your understanding. A car travels 85 km from Town A to Town B, then 45 km from Town B to Town C. The total trip took 1.5 hours. What was the car’s average speed? A. 65 km/h B. 87 km/h C. 131.5 km/h D. 2 km/h
Answers
Answer:
B. 87 km/h
Explanation:
We can find the average speed by using the relationship between speed, distance, and time.
Distance = Speed * Time
Reaarange this to obtain:
Speed = Distance/Time
Speed = (85+45)/1.5
Speed = 87 km/h
Why does a magnet exert force on another magnet when the two magnets are not in contact?
Answers
Answer:
1. Why does a magnet exert force on another magnet when the two magnets are not in contact? The magnetic field from north to south increases when they're closer together, and when they repel the repelling force increases as well. This is all due to the magnetic field.
Correct me if I'm wrong, Hope this helps
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Do tuning forks make sounds when hit from the vibrations? I'll give brainiest
Answers
Answer:
Yes
Explanation:
they make sound due to the fact that the vibration from the tuning fork itself interacts with the air around it. it's also worth mentioning that anything that vibrates creates sound waves as well.
if predators and habitat do not change, which shade of frogs will have the greatest fitness
Answers
Answer:
The dark green frogs will
Explanation:
because they blend more within the night than any other frog or animal out there
I hope this helps
If predators and habitat do not change, the dark green frogs will have the greatest fitness.
What is predators?Predators are organisms that hunt and kill other organisms for food. The organisms that are consumed by the predators are known as the prey.
The dark green frogs will have greatest fitness because they blend more within the night than any other frog or animal out there.
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A thin uniform disk of mass m and radius r has a string wrapped
Answers
The magnitude of the weight of the disk is greater than the magnitude of the tension force of the string. ((c) [tex]F_{T} < F_{g}[/tex])
How to analysis a rigid body on dynamical conditionA rigid body is a system whose geometry cannot be neglected and in which deformations due to external forces applied on the system are negligible.
In this question we need to establish a free body diagram with all critical forces and motion conditions. There are two external forces: (i) tension ([tex]F_{T}[/tex]), (ii) weight ([tex]F_{g}[/tex]), both in newtons.
The disk falls due to gravity and rotates around the string in a case of rolling, which combines rotation and translation. By Newton's laws of motion we have the following expression:
[tex]\sum F = -F_{g}+F_{T} = -m\cdot R\cdot \alpha[/tex] (1)
Where:
[tex]m[/tex] - Mass of the disk, in kilograms.[tex]\alpha[/tex] - Angular acceleration, in radians per square second.By algebra we derive the following relationship between the two forces:
[tex]-F_{g} = -F_{T}-m\cdot R\cdot \alpha[/tex]
[tex]F_{g} > F_{T}[/tex]
Therefore, the magnitude of the weight of the disk is greater than the magnitude of the tension force of the string. ((c) [tex]F_{T} < F_{g}[/tex]) [tex]\blacksquare[/tex]
Remark
The statement is incomplete and poorly formatted. Correct and complete form is shown below:
A thin uniform disk of mass m and radius r has a string wrapped around its edge and attached to the ceiling. The bottom of the disk is at height 3R above the floor, as shown above. The disk is released from rest. The rotational inertia of a disk around its center is [tex]I = \frac{1}{2}\cdot M\cdot R^{2}[/tex].
When released from rest, the disk falls and the string unwinds. The force that the string exerts on the disk is [tex]F_{T}[/tex], and the gravitational force exerted on the disk is [tex]F_{g}[/tex]. Which of the following expression correctly relates [tex]F_{T}[/tex] and [tex]F_{g}[/tex] as the disk falls?
(a) [tex]F_{T} > F_{g}[/tex], (b) [tex]F_{T} = F_{g}[/tex], (c) [tex]F_{T} < F_{g}[/tex]
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What type of electromagnetic waves cause sunburns?.
Answers
Answer:
ultraviolet waves
Explanation:
Our Sun emits light at all the different wavelengths in electromagnetic spectrum, but it is ultraviolet waves that are responsible for causing our sunburns.
Human skin is very sensitive to it
28. (a) A pendulum that has a period of 3.00000 s and that is located where the acceleration due to gravity is 9.79m/s2 is moved to a location where it the acceleration due to gravity is 9.82m/s2. What is its new period? (b) Explain why so many digits are needed in the value for the period, based on the relation between the period and the acceleration due to gravity.
The answer is "(a) 2.99541 s(b) Since the period is related to the square root of the acceleration of gravity, when the acceleration changes by 1% the period changes by (0.01)2=0.01% so it is necessary to have at least 4 digits after the decimal to see the changes." But please include the steps to each solution.
Answers
Answer:
See below ↓
Explanation:
Assuming the motion of a simple pendulum, the time period is given by
⇒ T = 2π√(L/g)⇒ T₁/T₂ = √(g₂/g₁)The values we have
T₁ = 3 sg₁ = 9.79 m/s²g₂ = 9.82 m/s²Solving
T₂ = T₁/√(g₂/g₁)T₂ = 3/√(9.82/9.79)T₂ = 3.004593 secondsThis many digits are needed because the acceleration is changed by a very small percentage (roughly 2 decimal places)So on taking the square root of the ratio of the gravity due to acceleration (2 values), 4 decimal places will be present at the very least
Item 1
The figure presents a block on a horizontal surface attached to a horizontal spring. The other end of the spring is attached to a wall. The spring is labeled 50 newtons per meter, and the box is labeled 0.5 kilogram. The horizontal position of the center of spring is x equals negative 0.3 meter. The horizontal position of the center of the box is x equals 0 meters. When the spring is stretched the box will be at a horizontal position of x equals 0.3 meter.
A block of mass 0.5kg on a horizontal surface is attached to a horizontal spring of negligible mass and spring constant 50N/m. The other end of the spring is attached to a wall, and there is negligible friction between the block and the horizontal surface. When the spring is unstretched, the block is located at x=0m. The block is then pulled to x=0.3m and released from rest so that the block-spring system oscillates between x=−0.3m and x=0.3m. What is the magnitude of the acceleration of the block and the direction of the net force exerted on the block when it is located at x=0.3m?
Magnitude of Acceleration Direction of Net Force
30m/s2 Positive
, Magnitude of Acceleration Direction of Net Force 30 meters per second squared Positive
Magnitude of Acceleration Direction of Net Force
30m/s2 Negative
, Magnitude of Acceleration Direction of Net Force 30 meters per second squared Negative
Magnitude of Acceleration Direction of Net Force
0 m/s2 Positive
, Magnitude of Acceleration Direction of Net Force 0 meters per second squared Positive
Magnitude of Acceleration Direction of Net Force
0 m/s2 Negative
Answers
Explanation:
No need to calculate the force you can just find by Hookes law
Hookes law states that
F=-kxWhere
F is force ,k is spring constant x is distanceSo
force remains negative as per it
Acceleration=50/0.5÷1/3=100/3=33≈-30m/s²Option B
What does it mean for something to have charge?
Answers
Pure substances can be made of atoms that are attracted to each other or atoms that are not attracted to each other. Which type of pure substance can create elaborate structures? (1 point)
Atoms that are attracted to each other because the bonds that form between them can support the creation of the structure.
Atoms that are attracted to each other because they will mix together to form a mixture with a different structure.
Atoms that are not attracted to each other because they will form bonds with each other and create a larger structure.
Atoms that are not attracted to each other because they will stay still and end up laying on top of each other.
Answers
The type of pure substances that can create elaborate structures is :
( D ) Atoms that are not attracted to each other because they will stay still and end up laying on top of each other.
What is an Elaborate structure ?An elaborate structure is a complex structure formed by the combination of different unrelated parts. Atoms that are un attracted to each other are made of different parts therefore when they come together they will lay on each other, forming an elaborate structure which is complex in nature.
Hence we can conclude that the type of pure substance that can create elaborate structures is Atoms that are not attracted to each other because they will stay still and end up laying on top of each other.
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25 cm 40° 35 N
what's the torque?
Answers
Answer:
t = 562.44 Newton centimeters
or
t = 5.62 Newton meters
Explanation:
The eqaution for torque is:
t = rFsin(θ)
We are given r, f, and θ.
Fill in what we know.
t = 25*35*sin(40)
t = 562.44
t = 562.44 Newton centimeters
or
t = 5.62 Newton meters
A sound wave passes from air into water and then into steel. With each change in medium, what happens to the speed of the wave?.
Answers
Answer:
Explanation:
You need to consider the index of refraction.
index of refraction of air: 1.00
index of refraction of water: 1.33
Index of refraction of steel: 2.75681
If the sound wave passed from air into water, it passes from a lower index to a higher index of refraction.
As the wave travels into the more dense medium (higher n), it slows down. Therefore from air to water (lower to higher) it slows down, and from water to steel (n of steel is higher that n of water) therefore it slows down even more.
Good evening! Can someone please answer this, ill give you brainliest and your earning 50 points. Would be very appreciated.
Answers
Answer:
Gases that are very good at absorbing long wave photons of infrared light
Explanation:
Green house gases examples are Carbon monoxide, nitric oxide etc.These gases absorb long wave photons of infrared light of sun's rays They melts the glaciers and increase the sea level .Activity 1. Circuit Designer
DIRECTIONS: Draw the corresponding circuit diagram and symbols using the given
number of components. If the diagram is given identify its components.
Please answer this correctly thank you.
Answers
The circuit diagram is a representation of an electric system. It represents the components of the system with symbols. Drawings in the attached file.
What is a circuit diagram?The circuit diagram is an electrical circuit representation, including the sequence of electrical components or devices.
These diagrams make use of different symbols to represent the elements in the electrical circuit and make clear the connections to one another.
Some of the components composing the electrical circuits are
Single electric cell ⇒ It is represented with two perpendicular lines. The larger line indicates the positive terminal, and a shorter line represents the negative terminal.
The battery ⇒ combination of cells. Two or more cells together
NOTE: Some authors represent the battery as a single cell. You should draw your diagrams considering this. In my representations, I will consider a battery as two cells.
Switch ⇒ plug key that allows or stops the current flow. It is represented as two circles and a line between them. If it is open, it is a perpendicular line. If it is closed, it is a horizontal line.Wire ⇒ connection between devices. It is represented as a continuous line.
Bulb ⇒ devise that glows when connected to electricity. It might be represented as a cross in a circle.
The resistor ⇒ regulates the amount of energy provided by the source. It is represented as a zig-zag line or a rectangle.
The ammeter ⇒ measures the current. Represented with an A.
Voltmeter ⇒ It measures the voltage. Represented with a V.
In the attached files, you will find the representations and the components. Please remember that a single battery is represented as two single cells. Make changes in your drawings if necessary.
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An object rotates with an angular speed that varies with time, as shown in the graph. How can the graph be used to determine the magnitude of the angular acceleration α of the object? Justify your selection.
Subtract the greatest value of the angular speed from the smallest value of the angular speed, because α=Δω.
Subtract the greatest value of the angular speed from the smallest value of the angular speed, because a equals delta omega .
Determine the slope of the line from 0s to 2s, because the slope represents ΔωΔt.
Determine the slope of the line from 0 second to 2 seconds , because the slope represents the fraction delta omega over delta t .
Determine the area bounded by the line and the horizontal axis from 0s to 2s, because α=12ωΔt.
Determine the area bounded by the line and the horizontal axis from 0 second to 2 seconds , because alpha equals one half omega delta t .
The angular acceleration cannot be determined without knowing the rotational inertia of the object.
Answers
We can find it up angular velocity with respect to time graph .
As
[tex]\\ \rm\Rrightarrow m=\dfrac{\Delta \omega}{\delta T}[/tex]
[tex]\\ \rm\Rrightarrow \alpha=\dfrac{\Delta \omega}{\delta T}[/tex]
So we get
[tex]\\ \rm\Rrightarrow m=\alpha[/tex]
We need the slope in order to find angular acceleration
We can determine the angular acceleration of the object by taking the slope of the line in the plot of angular speed versus time because the change in linear here.
What is angular acceleration ?The angular acceleration of an object is the measure of its rate of change in angular speed. Like the velocity, it a vector quantity and is characterized by a magnitude and direction.
The acceleration is the ratio of change in velocity to the time interval. From the graph of speed of an object versus the time taken, we can obtain the acceleration.
For a linear relation between the two quantities, the slope gives their ratio. Therefore, here, the slop of the line from 0 to 2 seconds represents the fraction delta omega over delta t. Hence, option D is correct.
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You’ll start by investigating how earth’s surface temperature varies. open my nasa data, and click on data set in the top left corner of the page. within the atmosphere category, select all data, then select temperature. now, select monthly air surface temperatures. after the new map appears on your screen, select the animate option near the top of the page, and then select ok to see the animation. set the time range on the animation for the most recent five years, and then click submit. you can control the speed of the animation with the controls beneath the map.
question 1
describe patterns you observe in earth’s surface temperature. how do these patterns change during the course of a year and from year to year? use lines of latitude and degrees celsius in your description.
Answers
Different patterns we observe in earth’s surface temperature due to angle, distance from the sun, latitude of the place and ocean currents.
Describe patterns you observe in earth’s surface temperature?The Earth's surface experiences a range of temperature due to different conditions such as angle of the sun, distance from the sun, the latitude of the place, distance from the sea, altitude of the place and ocean currents.
So we can conclude that different patterns we observe in earth’s surface temperature due to angle, distance from the sun, latitude of the place and ocean currents.
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what is this one too i dont know im lazy right now
Answers
Answer:
The answer is Digestion (d)At a later time interval, the thrust force is 50N, the drag force is 20N, the lift force is 40N, and the weight (gravity) force is 40N.
25N
Drag
40N
Lift
50N
Thrust
40N
Weight
During this time interval, which forces are unbalanced?
Answers
During this time interval, the unbalanced forces are the downward forces which include drag force and weight of the object.
Net force on the objectThe net force on the object is obtained by summing all the forces acting on the object.
Let the upward force = positive
Let the downward force = negative
Thrust force (upward) = 50 NDrag force (downward) = 20 NLift force (upward) = 40 NWeight (downward) = 40 NNet force = (50 N + 40 N) - (20 N + 40 N)
Net force = 90 N - 60 N = 30 N
Thus, during this time interval, the unbalanced forces are the downward forces which include drag force and weight of the object.
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Two pistons are in an enclosed volume with fluid in between them, such that
movement in one piston affects the location of the other piston, as shown in
the image below. If an explosion occurs in the piston on the left such that it
moves 1 m, what is the distance that the piston on the right will move
(assuming that friction can be neglected)? (Recall that work on an object is
equal to the force on the object times the distance it is moved, and that work
is conserved.)
Cross-sectional area - 25 mm
Cross-sectional area = 0,5 m
A. 2 m
B. 0.5 m
C. 1 m
D. 0.25 m
Answers
Answer:
The pressure in the fluid just below Piston 1 is
p_1=F_1/A_1=361\text{ Pa}.p
1
=F
1
/A
1
=361 Pa.
The pressure in the fluid just below Piston 2 is the same according to Pascal's law:
p_2=p_1=361\text{ Pa}.p
2
=p
1
=361 Pa.
The force being exerted on Piston 2 to keep the two pistons in equilibrium is
F_2=p_2A_2=330\text{ N}.F
2
=p
2
A
2
=330 N.
Explanation:
A particular circuit is made up of a battery, a switch, a buzzer, and wires connecting the components. All of the components
e in working order, but the buzzer does not make noise. Which statement explains this observation? (1 point)
The circuit lacks a power source.
The load cannot convert electrical energy
The switch is open
The conductors are not attached
Answers
If the buzzer in this connection fails to make a sound, it follows that the switch or the key is open.
What is a circuit?A circuit is a path designed for the flow of current. We have to take note of the fact that the switch or key must be closed before electric current can pass through the circuit and the buzzer will make a sound.
Therefore, were the buzzer in this connection fails to make a sound, it follows that the switch or the key is open.
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Answer:
C
- CONNECTIONS
--------------------------------
much love! <33
i need help, please. ASAP!!!!
Answers
Answer: A
Explanation:
Work is defined as the inner product between the force vector and the distance traveled. Due to the energy-work theorem, the total work done is equal to the change in kinetic energy. But since there is friction, we must also take into account that frictional force. The frictional force opposes the motion of the object, and will take away energy from the object in the form of heat. Therefore, we must subtract the amount of energy done by friction from the total kinetic energy.
For your case, the answer would be A. Although, that is technically incorrect. The car does not gain energy due to friction.
On the electromagnetic spectrum, what type of light is higher energy: X-rays or radio waves?
Answers
Answer:
Radio
Explanation:
X-rays is 10 x 10^-10
radio is 10⁴
A car is traveling in a race. The car went from the initial velocity of 35 m/s to the final velocity of 65 m/s in 5 seconds
What is the acceleration?
- 13 m/s
om/
6 m/s
13 m/s
Answers
Answer:
6m/s
Explanation:
a = (v-u)/t
acceleration, a
initial velocity, u
final velocity, v
time, t
substitute values and you'll get the answer
Answer:
6 m/s
Explanation:
An empty corn silo in the shape of a cylinder is being filled with corn
Answers
The percent of the silo filled with corn at 10 hours is 90.98%.
What is silo?Silos are used in order to maximize the grain storage life and preserve them. They are round and tall towers with high capacity for commercial or industrial purposes.
As the silo is in shape of cylinder, volume of the cylinder is
V = πr²h
where r = d/2 = 19/2 =9.5 ft
and h = 32 ft
Substitute the values, we get the volume of silo,
V = 3.14 x (9.5)² x 32 = 9068.32 ft³
The silo is filled with the constant rate. After 10 hours, in silo, the amount of corn will be gone doubled as compared to that of in 5 hours.
Amount of corn after 10 hours = 4125 x 2 = 8250 ft³
Percentage of silo filled in 10 hours = (amount after 10 hrs / total amount) x 100
Substitute the values, we get
=(8250 /9068.32 ) x 100 %
=90.98 %
Thus, the percent of the silo filled with corn at 10 hours is 90.98%.
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Light travels at 3.0 × 108 m/s in a vacuum. use the index of refraction for water to determine the speed of light in water. round your answer to the nearest tenth. × 108 m/s
Answers
Answer:
the answer is 2.3. I just answered this question and got it right.
Explanation:
The phenomenon bending of a wave as it crosses from one medium to another is said to be refraction. The speeds of light in the water will be 2.25×10⁸ m/sec.
What is the definition of refraction?The phenomenon bending of a wave as it crosses from one medium to another is said to be refraction. The difference in density is the cause of the bending.
Refraction is a term that is used to describe the phenomenon of refraction."The change in direction of a wave traveling through one medium to another is known as refraction."
The following data are given in the problem;
C is the Speed of light in a vacuum =3×10⁸ m/sec.
n is an index of refraction for water = 1.333
v is the speed of light in the water=?
The index of refraction is the ratio of the speed of light in a vacuum to the speed of light in water. By the formula of the index of refraction.
[tex]n=\dfrac{c}{v}[/tex]
[tex]V=\dfrac{c}{n}[/tex]
[tex]V=\dfrac{3\times10^8}{1.333}[/tex]
[tex]V=2.25\times 10^8 m/s[/tex]
Hence the speed of light in the water will be 2.25×10⁸ m/sec.
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