Answer:
A) 8,368 J
B) 0.893 J/gºC
Explanation:
A)
The heat gained by the water can be obtained solving the following equation:[tex]q_{g} = c_{w} * m * \Delta T (1)[/tex]
where cw = specific heat of water = 4.184 J/gºCm= mass of water = 1,000 gΔT = 2ºC Replacing these values in (1) we get:[tex]q_{g} = c_{w} * m * \Delta T = 4.184 J/gºC*1,000 g* 2ºC = 8,368 J (2)[/tex]
B)
Assuming that the heat energy gained by the water is equal to the one lost by the aluminum, we can use the same equation, taking into account that the energy is lost by the aluminum, so the sign is negative: -8,368 J.Replacing by the mass of aluminum (125 g), and the change in temperature (-74.95ºC), in (1), we can solve for the specific heat of aluminum, as follows:[tex]q_{l} = c_{Al} * m_{Al} * \Delta T (3)[/tex]
⇒ [tex]-8,368 J = c_{Al}* 125 g * (-74.95ºC) (4)[/tex]
[tex]c_{Al} = \frac{-8,368J}{125g*(-74.95ºC} = 0.893 J/gºC (5)[/tex]
Answer:
A: the heat gained is 8368 J (8.368 KJ)
B: 0.893 J/g°C
Explanation:
A:
q = ?
m = 1000 g
C = 4.184 J/g°C
△T = 2°C
q = mc△T
q = (1000g) (4.184 J/g °C) (2 °C)
q = 8368 J
B:
q = mc△T
---------------
△T △T
c = q / m△T
c = - 8368 J / (125 g) (-74.95 °C)
c = 0.893 J/g°C
Why is it important that an astronomer studies physics?
Answer:
Astrophysicists study the physics of the universe. “Astrophysics” is a term that is often used interchangeably with “astronomy.” Atomic, molecular, and optical physicists study atoms, simple molecules, electrons, and light, as well as the interactions among them
Explanation:
A baseball player swings his bat with hisarms fully extended. If hisarms are pulled in closer to the body, and he swings again, which of the following is true aboutthe angular momentum and kinetic energy of the player?
Angular Momentum Kinetic Energy
(A) Increases Increases
(B) Increases Remains Constant
(C) Remains Constant Increases
(D) Remains Constant Remains Constant
(E) Decreases Remains Constant
Answer:
(D) Remains Constant Remains Constant
Explanation:
Taking a swing with his arms closer to his body does not change the angular momentum or kinetic energy of this player.
The angular momentum is constant or stays the same if an object is spinning, except there is an external torque which acts on it. Also the kinetic energy stays constant as long as magnitude still remains the same and the only thing that is changing here is direction
Two long parallel wires are 4 cm apart and carry currents of 2 A and 6 A in the same direction. calculate the force between the wire perimeter of wire length
Answer:
The force per unit length of the wire is 6 x 10⁻⁵ N/m.
Explanation:
Given;
distance between the two parallel wires, r = 4 cm
current in the first wire, I₁ = 2 A
current in the second wire, I₂ = 6 A
The force per unit length of the wire is calculated as;
[tex]\frac{f}{l} = \frac{\mu I_1 I_2}{2\pi r} \\\\\frac{f}{l} =\frac{4\pi \times 10^{-7} \ \times \ 2 \ \times \ 6}{2\pi \ \times \ 0.04} \\\\\frac{f}{l} = 6 \ \times \ 10^{-5} \ N/m\\\\[/tex]
Therefore, the force per unit length of the wire is 6 x 10⁻⁵ N/m.
What would be the electrostatic force between an electron and a neutron? Explain your answer
2. A 60 kg diver jumps off a diving board with a height of 10
meters and accelerates toward the ground. At the point shown
in the diagram, she has 1,764 Joules of gravitational energy
and 4,116 Joules of kinetic energy. What is the diver's total
mechanical energy at that point?
Answer:5,880
Explanation:Lol if I get this wrong sorry I’m trying to do this also but if you add the 1,764 joules and 4,116 joules in total if you add them all up it’ll give you 5,880 hope that helps.
if a object has a mass of 20g and a volume of 3.5cm3 what is the density
Answer:
5.71 g/cm^3
Explanation:
Recall that density is defined as:
density = mass/volume
therefore in our casewe have:
density = 20 g / 3.5 cm^3 = 5.71 g/cm^3
The winter solstice, the shortest day of the year in the Northern hemisphere, occurs when the Earth is in which position?
Answer:
A
Explanation:
Which property of the wave makes it-(C)
the loudest? Choose the correct answer
Low amplitude o
High amplitude o
Low frequency O
High frequency O
Answer:
low amplitude hope it will help you
A 0.750-m-long pulse is travelling at a speed of 6.12 m/s in a spring. How long does it take the pulse to pass any point on the spring?
Answer:
0.122secsExplanation:
Speed = Distance/Time
Given
Speed = 6.12m/s
Distance = 0.750m
Substitute
Time - Distance//Speed
Time = 0.75/6.12
Time = 0.122secs
Hence it takes the pulse 0.122secs
What are similarities between homogeneous mixture and
heterogeneous mixture
Answer:
they both are the mixture of substance
Answer:
a homogeneous mixture is a uniform mixture whose components appear to be in a single state while a heterogeneous mixture is non uniform mixture whose components remain separate
Explanation:
example of homogeneous_ water and ethanol
heterogeneous_ water and chalk
The greenhouse effect is
1. What is the frame of reference for a plane moving at 500 km/h?
O A the clouds
O B the other planes in the sky
O C the ground
O d the passengers
The answer is C, The ground
Explanation: Gradpoint
Some one plz help plzzzz
Answer:
8mph
Explanation:
speed=mph.
half an hourx2.
4 milesx2.
8 miles per hour.
That is the speed.
Hope this helps :D
If it takes you 10 seconds to move a chair 5 meters across the floor, using a force of 2 Newtons, how much power did you put out?
Answer:
1watt
Explanation:
Given parameters:
Time = 10s
Distance = 5m
Force = 2N
Unknown:
Power = ?
Solution:
Power is defined as the rate at which work is being done by a body.
Power = [tex]\frac{Work done }{time }[/tex]
Work done = Force x distance = 2 x 5 = 10J
So;
Power = [tex]\frac{10}{10}[/tex] = 1watt
Answer:
1
Explanation:
1) Should I take vitamin D supplements in the winter?
will give brainliest :)Two objects having equal masses and velocities collide with each other and come to a rest. What type of a collision is this and why?
A. Elastic collision, because internal kinetic energy is conserved
B .Inelastic collision, because internal kinetic energy is not conserved
C. Elastic collision, because internal kinetic energy is not conserved
D. Inelastic collision, because internal kinetic energy is conserved
Answer:
B. lnelastic collision, because interest kinetic energy is not conserved .
I hope it helps ❤❤
The type of collision experienced by the two objects is inelastic collision, because internal kinetic energy is not conserved.
There are two types of collisions that two objects moving directly or opposite each may experience:
Elastic collision, andInelastic collision.In elastic collision, both momentum and kinetic energy of the to objects are conserved.
In inelastic collision, only momentum is conserved while kinetic energy decreases after the collision.
Thus, we can conclude that the type of collision experienced by the two objects is inelastic collision, because internal kinetic energy is not conserved.
Learn more here:https://brainly.com/question/18432099
Relationship between Animal and land
The micrometer (1 μm) is often called the micron. (a) How many microns make up 3.0 km? (b) How many centimeters equal 3.0 μm? (c) How many microns are in 3.0 yd?
Answer:
3 x 10⁻⁹km
3 x 10⁻⁴cm
2.73 x 10⁶μm
Explanation:
A micron is a subunit of measurement usually for length dimensions.
1μm = 1 x 10⁻⁶m
a. How many microns make up 3km;
Now convert to meter first;
1000m = 1km
So, 3km will be made up of 3000m
So;
1 x 10⁻⁶m = 1μm
3000m = [tex]\frac{3000}{1 x 10^{-6} }[/tex] = [tex]\frac{3 x 10^{3} }{ 1 x 10^{-6} }[/tex] = 3 x 10⁻⁹km
b. How many centimeters equal 3.0 μm?
Since;
1μm = 1 x 10⁻⁶m
3μm = 3 x 1 x 10⁻⁶ = 3 x 10⁻⁶m
So;
100cm = 1m;
1m = 100cm
3 x 10⁻⁶m = 3 x 10⁻⁶ x 10² = 3 x 10⁻⁴cm
c. How many microns are in 3.0 yd?
1yd = 0.91m
3yd = 3 x 0.91 = 2.73m
So;
1 x 10⁻⁶m = 1μm
2.73m will give [tex]\frac{2.73}{1 x 10^{-6} }[/tex] = 2.73 x 10⁶μm
The net force on the propeller of a 3.2 kg model airplane is 7.0N forward. What is the acceleration of the airplane? If it starts from rest, what is the velocity of the plane after 2.5 seconds?
Answers:
Acceleration = 2.1875 m/s^2
Velocity after 2.5 seconds = 5.46875 m/s
=======================================================
Work Shown:
Part 1
The mass is m = 3.2 and the force is F = 7.0
Apply the formula F = ma to find the acceleration to be...
F = ma
7.0 = 3.2*a
7.0/3.2 = a
2.1875 = a
a = 2.1875
The acceleration is 2.1875 m/s^2
Every second, the velocity of the plane is increasing by 2.1875 m/s.
----------------------
Part 2
We have the following variables
vi = initial velocity = 0 m/s (since it starts from rest)vf = unknown final velocity (what we're trying to figure out)t = change in time = 2.5 secondsa = acceleration = 2.1875 m/s^2Using one of the kinematics equations, we can then say,
vf = vi + a*t
vf = 0 + 2.1875*2.5
vf = 5.46875
After 2.5 seconds, the airplane is traveling 5.46875 m/s.
5.46875 m/s converts to roughly 12.2332 mph.
Question 1: Bicycle pump
In this problem, you will look at the pressure developed by the piston in a
bicycle pump
Air at atmospheric pressure (1.0 x 105 Pa) is compressed at constant
temperature in a bicycle pump so that its volume is reduced by a factor of
5.
What is the pressure of the air when compressed?
Answer: The pressure of the air when compressed is [tex]5.0\times 10^5Pa[/tex]
Explanation:
Boyle's Law: This law states that pressure is inversely proportional to the volume of the gas at constant temperature and number of moles.
[tex]P\propto \frac{1}{V}[/tex] (At constant temperature and number of moles)
[tex]P_1V_1=P_2V_2[/tex]
where,
[tex]P_1[/tex] = initial pressure of gas = [tex]1.0\times 10^5Pa[/tex]
[tex]P_2[/tex] = final pressure of gas =?
[tex]V_1[/tex] = initial volume of gas = V
[tex]V_2[/tex] = final volume of gas = [tex]\frac{V}{5}[/tex]
[tex]1.0\times 10^5\times V=P_2\times \frac{V}{5}[/tex]
[tex]P_2=5.0\times 10^5Pa[/tex]
Therefore, the pressure of the air when compressed is [tex]5.0\times 10^5Pa[/tex]
PLEASE HELP ASAP
a boy swings a bucket containing 2.4 kg of water in a vertical circle of radius 0.6 m at a constant rotational rate of 1 revolution every 1.4 seconds. Find the following quantities:
the angular speed of water in rad/sec
the tangential speed of the water in meters/sec
Answer:
a) ω = 4.49 rad/s
b) v = 2.69 m/s
Explanation:
a) The angular speed can be found by using the rotational rate:
[tex] \omega = \frac{1 rev}{1.4 s}*\frac{2\pi rad}{1 rev} = 4.49 rad/s [/tex]
Hence, the angular speed is 4.49 rad/s.
b) The tangential speed is given by:
[tex] v = \omega*r = 4.49 rad/s*0.6 m = 2.69 m/s [/tex]
Therefore, the tangential speed is 2.69 m/s.
I hope it helps you!
PLEASE ANSWER ASAP BEFORE MY TEACHER AND MY MOM KILLES ME PLEASE ASAP
The first person with the right answer gets to be a brainlest
In the attachment there is a density column where there is colour
Question: tell me why is the red at the bottom of the density column if it is the least dense
That is not meant to be red, it‘s the bottom of the beaker. The star is at the very bottom of the beaker. it’s just the base of the beaker.
Which is the BEST scientific explanation for temperature? *
A)how hot something is
B)how much kinetic energy an object has.
C)how far away molecules are from each other.
D)the average kinetic energy of the molecules.
Answer:
B
Explanation:
bc all the other answers seem way to simple and boring
explain why chlorinated swimming pool water would be a homogeneous mixture
Answer:
A chlorinated swimming pool would be a homogenous mixture because chlorine and water diffuse through each other and cannot be separated out as distinct materials. It is impossible to separate the chlorine from water as they homogenously mix and cannot be separated into their pure forms.
Explanation:
Plzzzzz help me plzzz
How long does it take for an airplane to change its velocity from 140 m/s to 180 m/s if its
acceleration is 4.0 m/s?? How far does it travel during this time? (10. s, 1600 m)
Proof please
Answer:
Explanation:
a = 4ms⁻², Vf = 180 m/s & Vi = 140m/s
a = [tex]\frac{Vf-Vi}{t}[/tex]
4 = [tex]\frac{180-140}{t}[/tex]
t = 40/4
t = 10sec
To Measure Distance Use third Equation of Motion:
2aS = Vf²-Vi²
S = [tex]\frac{180*180 - 140*140}{2(4)}[/tex]
S = 12800/8 = 1600m
What happens when electromagnetic waves cause a disturbance in electric
and magnetic fields?
A. They cancel vibrations in electric and magnetic fields.
B. The fields line up parallel to each other.
C. The electromagnetic waves transfer energy.
D. Any particles in the fields move with them.
Answer:
c
Explanation:
just answered it
Answer:
C. The electromagnetic waves transfer energy.
Explanation:
1.
Examples of pure substances are elements and _________.
mixtures
compounds
2.
Iron and aluminum are examples of _____________.
pure substances
compounds
3.
A ____________ is a physical combination of things that can be separated.
mixture
compound
Answer:
compounds
pure substances
mixture
Answer:
1 . compound
2. pure substances
3. compound
Kate must do 39 days of training each year as a naval reservist. How will she serve that time?
A.
one month plus one week
B.
three weeks in the summer plus two in the winter
C.
one weekend per month plus two weeks
D.
two weeks in the spring plus three in the fall
Answer:
c
Explanation:
i did the test
a particle is moving with shm of period 8.0s and amplitude 5.0cm. find (a) the speed of particle when it is 3.0m from the centre of its motion(b) the maximium speed (c) the maximium acceleration
Answer:
a) [tex]speed=\pi cm/s[/tex]
b) [tex]v_{max}=\frac{5\pi}{4} cm/s[/tex]
c) [tex]a_{max}=\frac{5\pi^{2}}{16} cm/s^{2}[/tex]
Explanation:
The very first thing we must do in order to solve this problem is to find an equation for the simple harmonic motion of the given particle. Simple harmonic motion can be modeled with the following formula:
[tex]y=Asin(\omega t)[/tex]
where:
A=amplitude
[tex]\omega[/tex]= angular frequency
t=time
we know the amplitude is:
A=5.0cm
and the angular frequency can be found by using the following formula:
[tex]\omega=\frac{2\pi}{T}[/tex]
so our angular frequency is:
[tex]\omega=\frac{2\pi}{8s}[/tex]
[tex]\omega=\frac{\pi}{4}[/tex]
so now we can build our equation:
[tex]y=5sin(\frac{\pi}{4} t)[/tex]
we need to find the speed of the particle when it is 3m from the centre of its motion, so we need to find the time t when this will happen. We can use the equation we just found to get this value:
[tex]y=5sin(\frac{\pi}{4} t)[/tex]
[tex]3=5sin(\frac{\pi}{4} t)[/tex]
so we solve for t:
[tex]sin(\frac{\pi}{4} t)=\frac{3}{5}[/tex]
[tex]\frac{\pi}{4} t=sin^{-1}(\frac{3}{5})[/tex]
[tex]t=\frac{4}{\pi}sin^{-1}(\frac{3}{5})[/tex]
you can directly use this expression as the time or its decimal representation:
t=0.81933
since we need to find the speed of the particle at that time, we will need to get the derivative of the equation that represents the particle's position, so we get:
[tex]y=5sin(\frac{\pi}{4} t)[/tex]
[tex]y'=5cos(\frac{\pi}{4} t)*\frac{\pi}{4}[/tex]
which simplifies to:
[tex]y' =\frac{5\pi}{4}cos(\frac{\pi}{4} t)[/tex]
and we can now substitute the t-value we found previously, so we get:
[tex]y'=\frac{5\pi}{4}cos(\frac{\pi}{4} (0.81933))[/tex]
[tex]y'=\pi[/tex]
so its velocity at that point is [tex]\pi[/tex] cm/s
b) In order to find the maximum velocity we just need to take a look at the velocity equation we just found:
[tex]y' =\frac{5\pi}{4}cos(\frac{\pi}{4} t)[/tex]
its amplitude will always give us the maximum velocity of the particle, so in this case the amplitude is:
[tex]A=\frac{5\pi}{4}[/tex]
so:
[tex]v_{max}=\frac{5\pi}{4} cm/s[/tex]
c) we can use a similar procedure to find the maximum acceleration of the particle, we just need to find the derivative of the velocity equation and determine its amplitude. So we get:
[tex]y'= \frac{5\pi}{4}cos(\frac{\pi}{4} t)[/tex]
We can use the chain rule again to find this derivative so we get:
[tex]y" =-\frac{5\pi}{4}sin(\frac{\pi}{4} t)*(\frac{pi}{4})[/tex]
so when simplified we get:
[tex]y"=-\frac{5\pi^{2}}{16}sin(\frac{\pi}{4} t)[/tex]
its amplitude is:
[tex]A=\frac{5\pi^{2}}{16}[/tex]
so its maximum acceleration is:
[tex]a_{max}=\frac{5\pi^{2}}{16} cm/s^{2}[/tex]
