The kinetic energy will be equal to the potential energy at top
PE=mghm is mass
h is height
PE=4.5(60)(9.8)PE=2646JAluminum is often melted down for recycling purposes. Assuming 1 kg of aluminum is at room temperature, what is the minimum amount of heat needed to melt it to a liquid? The specific heat capacity of aluminum is 899 J/kg°C, the melting point is 660°C, and the latent heat of fusion is 3.97 x 105 J/kg.
60 points
The minimum amount of heat needed to melt it to a liquid will be 569.067 kJ.
What is enthalpy of fusion?The minimum amount of heat needed to melt it to a liquid is known as the enthalpy of fusion.
The formula for the enthalpy of the fusion is;
[tex]\rm L_f=Q/m \\\\ L_f=mCdt/m \\\\ L_f= Cdt \\\\ L_f= 899 J/kg^0C \times (660^0-27^0) \\\\ L_f= 569,067 \ J \\\\\ L_f=569.067 \ kJ[/tex]
Hence, the minimum amount of heat needed to melt it to a liquid will be 569.067 kJ.
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On a space mission, the gravitational environment can negatively affect the bone density of astronauts. Which accommodation will most likely protect the bone health of the crew on a space mission?.
Answer:
a lot of oxygen with spacesuits
please help me with the question below the best answer with an explanation will get brainliest
Answer:
B
Explanation:
i hope this is correct.
Why does Venus have the largest gravitational attraction to the sun compared to the other inner planets?Write your Claim below:
the force of gravity is proportional to the mass of an object and inversely proportional to the square of the distance between the objects.
An oscillator makes 720 vibrations in 3 minutes.
A: How many vibrations does it make in one minute?
B: How many vibrations does it make in one second?
C: What is its period in seconds?
D: What is its frequency in hertz?
Answer:
Below :)
Explanation:
A) 720/3 =240. 40 per minute.
B) 720/180 = 4 per second.
C) T=1/4 s^-1 (the formula) = 1/4 s. (The time peroid.)
D) V=1/T
V= 4 Hz
[tex]\qquad\qquad\huge\underline{{\sf Answer}}[/tex]
An oscillator makes 720 vibrations in 3 minutes. so, we have to solve the given problems based on it ~
#1. what's the number of vibrations per minute •
[tex]\qquad \sf \dashrightarrow \: 3 \: min = 720 \: vib[/tex]
[tex]\qquad \sf \dashrightarrow \: 1 \: min = \dfrac{720}{3} [/tex]
[tex]\qquad \sf \dashrightarrow \: 1 \: min = 240 \: vib[/tex]
#2. Calculate unit vibrations per second •
[tex]\qquad \sf \dashrightarrow \: 1 \: min = 240 \: vib[/tex]
[tex]\qquad \sf \dashrightarrow \: 60 \: sec = 240 \: vib[/tex]
[tex]\qquad \sf \dashrightarrow \: 1 \: sec = 4 \: vib[/tex]
#3. What's it's time period •
time taken to do 1 vibration is known as a period, so we can infer that :
[tex]\qquad \sf \dashrightarrow \: 1 \: vib = \dfrac{1}{4} \: sec[/tex]
[tex]\qquad \sf \dashrightarrow \: t = 0.25 \: sec[/tex]
#4. what is it's frequency in hert •
[tex]\qquad \sf \dashrightarrow \: f = \dfrac{1}{t} [/tex]
[tex]\qquad \sf \dashrightarrow \: f = \dfrac{1}{0.25} [/tex]
[tex]\qquad \sf \dashrightarrow \: f = 4 \: hertz[/tex]
help me, i don't know the answer
Explanation:
1)
A) Bb BB
B) 50%
2)
A) 50%
B) b. b
B. Bb. Bb
b. bb. bb
The two principal sources for the internal heating of terrestrial planets are accretion and radioactivity. radiation and convection. convection and radioactivity. convection and accretion. accretion and eruption.
The three principal sources of internal heat of terrestrial planets accretion and radioactivity. Option A is correct.
What is heat transfer?The term "heat transfer" refers to the movement of heat. The flow of heat across a system's boundary is due to a temperature differential between the system and its surroundings.
The three principal sources of internal heat of terrestrial planets accretion and radioactivity.
Option A is correct.
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Can someone please answer this, ill give you brainliest Would be very appreciated.
A decrease in the ice caps causes a(n) (options decrease, increase) in the absorption of sunlight. This causes the global temperature to (options rise, fall) causing more ice caps to melt. As more ice caps melt, the temperature (options rises, falls). This is an example of a (options negative, positive) feedback loop.
Answer:
See below ~
Explanation:
A decrease in the ice caps causes a(n) increase in the absorption of sunlight. This cause the global temperature to rise causing more ice caps to melt. As more ice caps melt, the temperature rises. This is an example of a negative feedback loop.
A decrease in the ice caps causes a(n) increase in the absorption of sunlight. This causes the global temperature to rise causing more ice caps to melt. As more ice caps melt, the temperature rises. This is an example of a negative feedback loop.
The options are followed by
IncreaseRiserisesnegativewhat is collinear and concurrent
Answer:
Collinear Force System: When the lines of action of all the forces of a system act along the same line, this force system is called collinear force system. Concurrent Force System: The forces when extended pass through a single point and the point is called point of concurrency.
Before you start your engine, __________ A. adjust the seat so you can reach all controls. B. make sure your car is in reverse or neutral gear before starting the engine. C. move your car before you have looked in front, behind and to the side for pedestrians and oncoming traffic. D. all of the above
Answer:
A. adjust the seat so you can reach all controls
------------------------------------------------------
This is so you can reach the gas petal, break petal, steering wheel, (and other things) easier so you won't have to lean forward and it makes it easier for when you're driving. Especially if you need to quickly press your breaks, you'll be able to do this a lot faster if you're closer to them than if you had to reach in order to do so.
I hope this helped, im not the best at explaining things lol
the following are three frequencies of sound wave:
1800Hz,50Hz,10,000Hz.
a).which has the highest pitch and which has the lowest pitch?
b).what does Hz stands for?
50 POINTS! I PROMISE BRAINLIEST IF PLEASEEE I NEED HELP!
A 12 v battery produces a current of 25 amps. What is the resistance
Please help me
Answer:
The resistance is 2 ohms
Show that the square of the period of revolution of a satellite is directly proportional to the cube of the orbital radius
Answer:
Explanation:
An airplane is flying in a horizontal circle at a speed of 490 km/h. If its wings are tilted at angle ɵ = 45° to the horizontal, what is the radius of the circle in which the plane is flying? Assume that the required force is provided entirely by an “aerodynamic lift” that is perpendicular to the wing surface.
The radius of the circle in which the plane is flying is 1887 m.
What is aerodynamic lift?The aerodynamic lift is the force that keeps the aircraft flying in the air.
Let the aerodynamic lift be F1 sinθ= mv^2/R ---- (1)
and F1 cosθ= mg --------- (2)
Equating (1) and (2) and eliminating the mass;
R = v^2/ g tanθ
Where v = 490 km/h or 136 m/s
R = (136)^2/9.8 * tan 45
R = 18496/ 9.8
R = 1887 m
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Assuming we receive a signal from a civilization on the other side of our galaxy, a two-way conversation with them is ________.
what could you do to increase the final momentum of a golf ball?
Answer:
I would hit it as hard as you can with the club.
Explanation:
well one thing that I like to do is hit the golf ball as hard as possible with the club.
This is because for me, when I do that, I can normally get more momentum which means I also get a farther hit.
you are designing an airport for small planes. one kind of airplane that might use this airfield must reach a speed before takeoff of at least 27.8m/s and can accelerate at 2.00m/s a)if the runway is 150m long,can this airplane reach the required speed for take off?(in this case v=24.5 m/s) b) if not, what minimum length must the runway have(193m)
(a)The required speed for take off will be 24.49 m/sec.
(b)The minimum length must the runway have 193 m.
What is speed?Speed is defined as the rate of change of the distance or the height attained. it is a time-based quantity. it is denoted by u for the initial speed while v for the final speed. its SI unit is m/sec.
(a)The required speed for take off will be 24.49 m/sec.
From the Newtons third equation of motion;
[tex]\rm v^2 = u^2+2as \\\\ v=0+2 \times 2 \times 150 \\\\ v=\sqrt{600}\\\\ v=24.49 \ m/sec[/tex]
Hence, the required speed for take off will be 24.49 m/sec.
(b)The minimum length must the runway have 193 m.
From the Newtons third equation of motion;
[tex]\rm v^2 = u^2+2as \\\\ (27.78)^2 = 0+2\times 2 s \\\\\ s=192.93 \ m[/tex]
Hence, the minimum length must the runway have 193 m.
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how are the magnetic domains of a magnet different from the domains of an ordinary piece of metal?
The brightness of a star decreases by the square of the distance. This is known as:.
Answer:
inverse-square law.
Explanation:
Since the area increases as the square of the distance, the brightness of the light must decrease as the inverse square of the distance.
hope this helped you!
Identify the products of this single-replacement reaction between sulfuric acid and aluminum. Then balance the equation
___H2SO4 + ___Al → ___ + ___
Answer/Solution
I hope it help.
Aluminium is far powerful and reactive than hydrogen so it will displace H_2 easily.
The reaction becomes
H_2SO_4+Al—»Al_2(SO_4)_3+H_2Balanced reaction
3H_2SO_4+2Al—»Al_2(SO_4)_3+3H_2Can someone please answer this, ill give you brainliest Would be very appreciated.
Answer:
C. Surface tension
What property of water allowed the paperclip to stay on the top of the water?
Solution:Surface Tension
Explanation:The strong surface tension enables the paper clip float on the water, despite its much higher density which is caused by the cohesive forces between liquid molecules.
What type of nuclear reaction is shown in the diagram below? Write 2 - 3 sentences describing what happens in this reaction, where it happens, and how the energy released can be harnessed for use in homes.
This happens at Sun 's inside
The process is called fusionThis denotes to
When two hydrogen nucleus combine to form a single helium nucleus.It releases lots of solar energy which can be used to create electricity
A twirler’s baton is 0.76 m long and spins around its center. the end of the baton has a centripetal acceleration of 47.8 m/s2. how long does it take the baton to complete one spin? 0.31 s 0.56 s 4.3 s 70 s
The time it takes the baton to complete one spin is determined as 0.56 s.
Time of motion of the baton
The time of motion of the baton is calculated as follows;
a = 4π²R/T²
where;
R is radius of the wire = ¹/₂(0.76) = 0.38T² = 4π²R/a
T² = (4π² x 0.38)/47.8
T² = 0.3138
T = 0.56 s
Thus, the time it takes the baton to complete one spin is determined as 0.56 s.
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sound travels faster in air if the air temperature is:
Which is the last stage in the life cycle of an average star? (1 point)
A.white drawf
B.super red giant
C. planetary nebula
D.neutron star
Answer:
The answer is A. White Dwarf
Explanation:
average stars like sun end their life as white dwarf surrounded by disappearing planetary nebula.Station A
? Arrival Time for P Wave
minu
? Arrival Time for 5 Wave
? S-P Lag Time (secs)
? Distance from Epicenter (km)
30
Station B
TIME(econd
Station B
? Arrival Time for P Wave
wwwwwwww
? Arrival Time for S Wave
? S-P Lag Time (secs)
? Distance from Epicenter (km)
30
TIME (second)
-Buon C
Station C
? Arrival Time for P Wave
10
призми мили
? Arrival Time for S Wave
? S-P Lag Time (secs)
100
300
200
Distance from Epicenter
? Distance from Epicenter (km)
90
TIME (second)
NOW: Use your information above to determine which earthquake these seismographs represent. Check the correct box!
90
2
8
8
*PART THREE:
MYSTERY EARTHQUAKE
/Mark the start of the P Wave AND S Wave
Find the Lag Time
Use the Lag Time Graph to determine each
Stations' distance to the epicenter.
Based on the Distances, choose which map
depicts your earthquake!
Graph
Lag time of S-wave behind P-wave
(seconds)
100 0
8
Nasme
8
A common practice for a person with a high fever is to take a bath in cool water. Assuming an 80 kg person is really ill and needs to cool down from 40°C to 37°C. What is the minimum amount of water needed for bathing assuming the water begins at room temperature, 25°C?
The minimum amount of water needed for bathing assuming the water begins at room temperature is 16.58kg.
What is thermal equilibrium?When two bodies at different temperature come into contact, they share the heat through conduction. After some time, temperature of both becomes equal. This condition is said to be a body in thermal equilibrium with other.
Heat gained by the water = heat lost by the ill person
m x Cw x ΔT = M x Cp x Δt
where, mass of person M = 80kg, Cp =specific heat of body =3470, specific heat of water Cw= 4186, then mass of water m will be
m x 4186 x (37-25) =- 80 x 3470 x (37-40)
m = 16.58kg
Thus, the mass of water needed is 16.58kg.
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NEED HELP ASAP WILL GIVE 20 POINTS
Floods are natural disasters that can cause what other natural disaster?
tsunami
landslide
hurricane
erosion
calculate area triangle 15*20
Answer:
300
Explanation:
15 * 20 = 30
15 *
20 =
——
300