Let the final temperature be "T".
For the piece of copper :
mass, [tex]\sf{m_c=40\ g.}[/tex]specific heat capacity, [tex]\sf{c_c=0.4\ J\,g^{-1}\,K^{-1}.}[/tex]initial temperature, [tex]\sf{T_c=200^{\circ}C.}[/tex]Then the heat of copper :
[tex]\sf{\dashrightarrow Q_c=m_cc_c\,\Delta\!T_c}[/tex]
[tex]\sf{\dashrightarrow Q_c =16(T-200)\ J}[/tex]
For copper calorimeter :
mass, [tex]\sf{m_{cc} =60\ g.}[/tex]specific heat capacity, [tex]\sf{c_{cc} =0.4\ J\,g^{-1}\,K^{-1}.}[/tex]initial temperature, [tex]\sf{T_{cc} =25^{\circ}C.}[/tex]Then the heat of copper calorimeter :
[tex]\sf{\dashrightarrow Q_{cc} =m_{cc}c_{cc}\,\Delta\!T_{cc}}[/tex]
[tex]\sf{\dashrightarrow Q_{cc} =24(T-25)\ J}[/tex]
For water :
mass, [tex]\sf{m_w=50\ g. }[/tex]specific heat capacity, [tex]\sf{c_w= 4.2\ J\,g^{-1}\,K^{-1}.}[/tex]initial temperature, [tex]\sf{T_w=25^{\circ}C.}[/tex]Then heat of water :
[tex]\sf{\dashrightarrow Q_w=m_wc_w\,\Delta\!T_w}[/tex]
[tex]\sf{\dashrightarrow Q_w=210(T-25)\ J}[/tex]
By energy conservation, the sum of all these energies should be zero as there were no heat energy change before the process, i.e.,
[tex]\sf{\dashrightarrow Q_c+Q_{cc}+Q_w=0}[/tex]
[tex]\sf{\dashrightarrow16(T-200)+24(T-25)+210(T-25)=0}[/tex]
[tex]\sf{\dashrightarrow 250T- 9050=0}[/tex]
[tex]\sf{\dashrightarrow T=36.2^{\circ}C}[/tex]
[tex] \large \underline{\underline{\boxed{\sf T=36.2^{\circ}C}}}[/tex]
____________________________
[Note: in case of considering temperature difference it's not required to convert the temperatures from [tex]\sf{^{\circ}C}[/tex] to K or K to [tex]\sf{^{\circ}C}[/tex].]
An astronaut has a mass of 95 kg. Calculate his weight on the Earth’s moon. The acceleration due to gravity on the Earth's moon is 1.6 m/s^2.
Answer:
95 x 1.6 = 51.78 is your answer
Explanation:
the question is asking for the weight of the object so you multiply and get 51,78
An astronaut has a mass of 95 kg so his weight on earth's moon where the acceleration due to gravity is 1.6 m/s² is 152 N.
What is the acceleration due to gravity?The acceleration that an object experiences as a result of the gravitational force is known as acceleration due to gravity. ms² is its SI unit. It has a direction and a magnitude. It is a vector quantity as a result.
The letter g stands in for the acceleration brought on by gravity. Its typical value at sea level on the surface of the earth is 9.8 ms2. The second law of motion and the law of universal gravitation of Newton serve as the foundation for its computation formula.
According to the question, the given values are :
Mass, m = 95 kg
Acceleration due to gravity, g = 1.6 m/s²
The formula is :
W = m × g
W = 95 × 1.6
W = 152 N
So, the astronaut's weight on the Earth's moon will be 152 N.
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Calculate the percentage increase in speed of the cyclist when the power output changes from 200 W to 300 W.
Answer:
50%
Explanation:
Given
Initial power = 200W
Final power = 300W
Increment = 300 - 200 = 100W
percentage increase = increment/initial power * 100
percentage increase = 100/200 * 100%
percentage increase = 0.5 * 100
percentage increase = 50%
Hence the percentage increase in speed is 50%
I need help on the data section of the circuit design lab on Edg.
I hope it's not too late, but here you go
What is a living organism? Give a few examples.
Please help! Own words please!
Will mark brainliest!
Answer:
It's a individual form of life. Examples of this are bacterium , protists and fungus
If you move 50 meters in 10 seconds, what is your speed
Explanation:
My answer didn't save :(
5 meters per second
11.1845 miles per hour
Explanation:50/10=5
Light strikes a smooth wooden tabletop. What happens to the light after it is reflected?
O The light rays bounce off the table and all move in the same direction.
O The light rays bounce off the table and move in different directions.
O The light rays pass through the table and all move in the same direction.
O The light rays pass through the table and move in different directions.
Answer:
The light rays bounce off the table and all move in the same direction is answer.
Explanation:
I hope it's helpful!
Answer:
A. The light rays bounce off the table and all move in the same direction.
Explanation:
What Determines the amount of TE of an object
Answer:
To find the volume of a rectangular object, measure the length, width and height. Multiply the length times the width and multiply the result by the height. The result is the volume. Give the result in cubic units, such as cubic centimeters.
Explanation:
Answer:
Kinetic energy is the energy possessed by an object due to its motion. If an object is moving, then it has kinetic energy. The amount of kinetic energy depends on mass and speed.
Explanation:
2. Does a solar cell always maintain the potential across its terminals
constant? Discuss.
Answer:
hi
Explanation:
The wavelength of a particular wave on the ocean is 5 meters. The
wave travels at a velocity of 10 m/s.
What is the frequency of this water wave in Hertz?
Answer:
node jaer le cotenidonv
Explanation:
escirbloa em cuietw n bl********
If you stand 50 cm from a plane mirror, where is your image?
Answer:
100 cm away from you
Explanation:
Found a good example demonstrating this problem I think:
A dog running at 7.92 m/s slows down to 3.22 m/s in 4.88 s. How far does he go during this period of time?
Answer:
the distance traveled by the dog is 27.18 m.
Explanation:
Given;
initial velocity of the dog, u = 7.92 m/s
final velocity of the dog, v = 3.22 m/s
time of motion, t = 4.88 s
The distance traveled by the dog is calculated as;
[tex]s = (\frac{v+u}{2} )t\\\\s = (\frac{7.92 + 3.22}{2} )(4.88)\\\\s = 27.18 \ m[/tex]
Therefore, the distance traveled by the dog is 27.18 m.
Would this circuit be parallel or series?
It would be a parallel circuit.
Among the bodies in our solar system are asteroids, moons, planets and the Sun. Which statement least supports the theory that gravity helped form our solar system?
A.The Sun consists primarily of gases.
B.Many objects in space are spherical in shape.
C.Planets revolve around an object of greater mass.
D.Planets form by small masses combining into larger masses.
Answer:
A
Explanation:
Approximately 4.6 billion years ago, the solar system was a cloud of dust and gas known as a solar nebula. Gravity collapsed the material in on itself as it began to spin, forming the sun in the center of the nebula. ... Small particles drew together, bound by the force of gravity, into larger particles.
The Sun consists primarily of gases least supports the theory that gravity helped form our solar system.
What is the Solar System?The Solar System can be defined as the gravitationally bound system of the Sun and the objects that orbit it. Our solar system is formed 4.6 billion years ago from the gravitational collapse of a giant molecular cloud. The vast majority of the mass is in the Sun, with most of the rest mass contained in the planet Jupiter.
The four giant planets of the solar system are substantially larger and extremely massive than the terrestrials planets. Jupiter and Saturn, are gas giants, being made of mainly of hydrogen and helium.
The initial molecular cloud was several light-years across and probably birthed several stars. It consisted mostly of hydrogen, with some helium, and little amounts of heavier elements fused by generations of stars.
This region would become the Solar System, called as the pre-solar nebula collapsed, conservation of angular momentum caused it to rotate.
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Atom X contains seven protons and seven neutrons. Atom Z contains seven protons and eight neutrons. Which of the following statements BEST describes the two atoms?
Two runners start at the same point and jog at a constant speed along a straight path. Runner A starts at time t = 0 s, and Runner B starts at time t = 2.5 s. The runners both reach a distance 64 m from the starting point at time t = 25 s. If the runners continue at the same speeds, how far from the starting point will each be at time t = 45 s?
Answer:
See explanation below
Explanation:
First thing to do here, is to calculate the speed of each runner. The problem states that both runners jog at a constant speed. We are given data for both runners, the starting time and the time where both of them reach the same distance.
With these data we can calculate the speed of both runners. Let's do it with runner 1:
If by t = 25 s it reach a 64 m of distance, then his speed:
V = d/t (1)
Replacing we have:
V₁ = 64 / 25 = 2.56 m/s
With this speed we can calculate the distance at t = 45 s so:
d = V * t (2)
d₁ = 2.56 * 45
d₁ = 115.2 mSo Runner 1 will be at 115.2 from the starting point at 45 seconds.
For runner 2, he began at t = 2.5 s, but he reach the 64 m at 25 s, so his speed would be:
V₂ = 64 / (25-2.5) = 2.84 m/s
And the distance at t = 45 s
d₂ = 2.84 * 45
d₂ = 127.8 mRunner 2 is 127.8 m from the starting point at 45 seconds.
Hope this helps
in December which will have a longer day length a country im notheren hemisphere or southern hemisphere
Answer:
Southern Hemisphere
Explanation:
Identify how scientists use radioactive isotopes by selecting the best answers from the drop-down menus. Archaeologists use radioactive isotopes to . Scientists use radioactive isotopes in agriculture to
Answer:
In order to determine or find out about the age of archaeological finds such as fossils, rocks, etc., archaeologists use radioactive isotopes in a process called radioactive dating.
In agriculture, radioactive isotopes have a lot of uses. These comprise of but are not limited to the following:
Improvement of food cropspreservation of food, Establish and estimate the presence and volume of water in the soil for farms;Hormonal analysis for animals (livestock) etcExplanation:
C-14 and Phosphorus - 32 are examples of Radioactive isotopes. Because they decay over time, they are easy to use when it comes to radioactive dating.
When an isotope carried an unstable amount or number of atoms, neutrons, and protons, they are said to be Radioactive. It also means that they have too unstable or excess energy in their nucleus. This condition causes them to decay faster than their stable relatives.
In archaeology, dating the artifacts that are discovered is important because it helps to establish the correct relationship between one find or artifact and another. Because humans can't go back in time, one of the ways to know what humans did or didn't do, or what events occurred in a place by other living things is the items/evidence they left behind. Categorizing these times/artifacts by date helps to give a clearer picture of what happened in a particular block of time and this is exactly what dating is all about.
In agriculture, one of the radioactive isotopes used is Phosphorus - 32.
When the plant's uptake of fertilizer from the roots to the leaves needs to be established, Phosphorus-32 is utilized. A fertilizer that has already been mixed with the above radioactive isotope is administered to the plant using a hydroponic system or via the traditional means (water in the soil). The phosphorus 32 emits beta radiation which is then tracked and mapped accordingly.
Cheers
Answer:
1. C (determine the age of ancient artifacts)
2. A (understand the biological and chemical processes in plants)
3. B (determine the age of rocks and fossils)
Explanation:
The other guy didn't quite give a clear answer so I might as well help some people.
will give brainliest to correct answer.
A particle has a charge of 1.9x10-6C. What is the charge on a second particle if the electrical force acting on it is 25N at a distance of 0.32m away?
Answer:
1.5X10^-4C
Explanation:
Expression for the electric force between the two charges is given by -
F = (k*q1*q2) / r^2
Here, k = constant = 9 x 10^9 N*m^2 / C^2
q1 = unknown
F=25N
q2 = 1.9x10^-6 C
r = 0.32 m
Substitute the given values in the above expression -
25=9x10^9 *(q1) * 1.9 x10^ -6/ (0.32m)^2
25= 17,100* (q1)/ 0.1024
multiply both sides by 0.1024 to get rid of the denominator
2.56=17,100*(q1)
Divide both sides by 17,100 to isolate q1
q1=1.5x10^-4C
Imagine you are dating a mineral sample that contains one-eighth of its original parent isotope. What is the
absolute age of the sample if the half-life of the parent isotope is 15 years?
A. 1.875 years
B. 23 years
C. 45 years
D. 120 years
Answer:
c
3 half lifes have passed to get to 1/8
1/2 then 1/4 then 1/8
so 15*3
Explanation:
Can someone help me please
Answer: The distance traveled by the car once around the racetrack = 100 meters.
Explanation:
Given: The length of the track = 100 meters
The distance is defined as the actual measurement of the path traveled by a body or an object.Then, the distance traveled by the car around the racetrack = Length of the track = 100 meters.
Hence, the distance traveled by the car once around the racetrack = 100 meters
Tiny droplets of water collect in the air as water vapor becomes liquid water. This process in the water cycle is called...
Answer:Condensation
Explanation:
Answer:
Condensation
Explanation:
Condensation is the process by which water vapor in the air is changed into liquid water.
"Water vapor"
"Becomes"
"Liquid water"
The water vapor converted into liquid water, which is the process of condensation.
Hope it helped!
Have a supercalifragilisticexpialidocious day!
A bromine atom has an atomic number of 35 and an atomic mass of 80.
What is the structure of this atom?
A. It has a central nucleus composed of 45 protons and 35 neutrons,
surrounded by an electron cloud containing 35 electrons.
O B. It has a central nucleus composed of 35 protons and 80 neutrons,
surrounded by an electron cloud containing 35 electrons.
C. It has a central nucleus composed of 35 protons and 35 neutrons,
surrounded by an electron cloud containing 45 electrons.
D. It has a central nucleus composed of 35 protons and 45 neutrons,
surrounded by an electron cloud containing 35 electrons.
The number of electrons is the atomic number of an atom. It is equal to the number of protons as well. Bromine has a central nucleus composed of 35 protons and 45 neutrons, surrounded by an electron cloud containing 35 electrons.
What is bromine?Bromine is 35th element in periodic table. It is a non-metal in the 17th group known as halogen family. Bromine is relatively electronegative and forms ionic compounds with metals.
The atomic number of an atom is the number of electrons in its neutral state. In a neutral atom the number of electrons and protons are equal. Mass number of an atom is the sum of number of protons and neutrons.
Atomic number of Br is 80. Hence, the number of electrons and protons in it is 35. Its mass number is 80. Thus, number of neutrons is 80 - 35 = 45. Thus, option D is correct.
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Now it's your turn
6
A golfer hits a ball of mass 45 g at a speed of 40 m 5-1 (Figure 4.15). The golf club is
in contact with the ball for 3.0 ms. Calculate the average force exerted by the club on
the ball.
Answer:
The average force the golf club exerts on the ball is 600 N
Explanation:
Newton's second law of motion states that force, F, is directly proportional to the rate of change of momentum produced
F = m× (v₂ - v₁)/(Δt)
The given parameters of the motion of the ball are;
The mass of the ball, m = 45 g = 0.045 kg
The initial velocity of the ball, v₁ = 0 m/s
The speed with which the ball was hit by the golfer, v₂ = 40 m/s
The duration of contact between the golf club and the ball, Δt = 3 ms = 0.003 seconds (s)
By Newton's law of motion, the average force, 'F', which the golf club exerts on the ball is therefore, given as follows;
F = 0.045 kg × (40 m/s - 0 m/s)/(0.003 s) = 600 N
The average force the golf club exerts on the ball = F = 600 N.
A train moves at a constant velocity of 90 km/h. How far will it move in 0.25h?
WHICH ONE!!! ASAP FOR A RETAKE FOR SCIENCE PLS
will give brainliest to correct answer.
A particle has a charge of 1.9x10-6C. What is the charge on a second particle if the electrical force acting on it is 25N at a distance of 0.32m away?
Answer:
1.5x10^-4C
C=Couloumb's
Explanation:
Expression for the electric force between the two charges is given by -
F = (k*q1*q2) / r^2
Here, k = constant = 9 x 10^9 N*m^2 / C^2
F=25N
q1 = 1.9x10^-6 x 10^-6 C
q2 = ?
r = 0.32m
Substitute the given values in the above expression -
25N= 9x10^9 *1.9x10^-6 *q2 / 0.32m^2
25N= 17,100*q2 / 0.1024m
Next part is algebra multiply both sides by 0.1024 to remove denominator
2.56=17,100*q2
Divide both sides to isolate q2
q2= 1.5x10^-4C
The three vehicles shown below are all traveling at a speed of 15 m/s, but only the pickup truck has a changing velocity.
The pickup trick has a changing velocity
Because the pickup truck is __________.
Answer: its slowing down
Explanation:
The car is slowing down because its on the corner of the track.
If it were to go the same speed the other cars are going while on the straight part of the track it would go off the track therefore the car must slow down to stay in the race
The pickup truck has a changing velocity as it is slowing down. This is because the truck is on the corner of the truck.
What is the reason for changing velocity?
An object can change its velocity in a number of different ways as it can slow down, it can speed up, or it can change its direction of motion. A change in the speed, or a change in the direction of motion, or a change in both the speed and direction of motion of the object means that the object has an overall change in velocity.
The pickup truck is slowing down because it is on the corner of the track. If it were to go on with the same speed as the other cars are going in the direction while on the straight path of the track it would go off the track and therefore the car must slow down to stay in the race of vehicles.
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Calculate the time of fight for a horizontally launched projectile from a height of 20m above the ground with an initial velocity of 5m/s.
Please
Answer:
0.5sec
Explanation:
Parameters
Height(H) =20m
Initial velocity(u) = 5m/s
Acceleration due to gravity(g) =10m/s^2
Method one
Using the second law of motion
H=ut-1/2gt^2
20=5t-1/2×10×t^2
20=5t-5t^2
dh/dt = 5-10t
where any constant is zero therefore the 20 is zero
5-10t=0
Collect like terms
-10t= -5
t=1/2 = 0.5sec
2nd method
Parameters
Height(H) =20m
Initial velocity(u) = 5m/s
Acceleration due to gravity(g) =10m/s^2
Using the time taken formula
t=u/g
t=5/10
t=0.5sec
: Modeling Chemical Reactions
Due 02/01/21 11:59
Keesha performed a chemical reaction, and the products looked quite different from the reactants She knew the amount of matter had not changed due
to the law of conservation of mass According to the law or conspivation of mass, what happens in a chemical reaction?
A Matter is not created or destroyed and the same amount of mass remains
B A new kind of matter is created and the amount of mass either increases or decreases
C Matter is not created or destroyed and the amount of mass may change after the reaction
D. New matter is created and changes form so that the mass of the reactants and the products will almost be equal
no
Answer:
A Matter is not created or destroyed and the same amount of mass remains
Explanation:
In a chemical reaction, according to the law of conservation of matter, "matter is neither created nor destroyed and the same amount of mass remains in such a process".
New kinds of products are formed in a chemical reaction because they undergo chemical changes. The chemical changes results in energy changes and formation of new kinds of substances. Based on the law of conservation of matter, mass is constant. Mass is not lost or gained.A bucket tied to a rope is moving at a constant speed of 5.0 m/s in a circle of radius
2.0 m. Calculate the approximate magnitude of the centripetal acceleration of the bucket.
The below answer choices are in m/s^2
A.) 2.5
B.) 6.2
C.) 12.5
D. None of these
Answer:
[tex]a=12.5\ m/s^2[/tex]
Explanation:
Given that,
The speed of the bucket tied to a rope, v = 5 m/s
The radius of the circle, r =2 m
We need to find the magnitude of the centripetal acceleration of the bucket. The formula for the centripetal acceleration is given by :
[tex]a=\dfrac{v^2}{r}\\\\a=\dfrac{(5)^2}{2}\\\\a=12.5\ m/s^2[/tex]
So, the centripetal acceleration of the bucket is [tex]12.5\ m/s^2[/tex].
