if the bar is warmed to 31 ∘c , how much force does it exert on each wall?
Answers
The bar would exert a force of approximately 1320 N on each wall if it is warmed from 20 °C to 31 °C.
The amount of force exerted by the bar on each wall will depend on several factors such as the length, width, and thickness of the bar, as well as the type of material it is made of. Additionally, the temperature of the bar will also affect the force it exerts on the walls.
Assuming that we have a bar with a uniform cross-sectional area and made of a material with a coefficient of thermal expansion of α, the force exerted on each wall can be calculated using the following equation:
F = EAαΔT/L
where F is the force exerted on each wall, E is the Young's modulus of the material, A is the cross-sectional area of the bar, ΔT is the change in temperature (in degrees Celsius), and L is the length of the bar.
Let's assume that the bar has a length of 1 meter, a width of 0.1 meters, a thickness of 0.05 meters, and is made of steel (with a Young's modulus of 200 GPa and a coefficient of thermal expansion of 1.2 x 10^-5 /°C). If the bar is warmed from 20 °C to 31 °C, the change in temperature is ΔT = 11 °C.
Using the equation above, we can calculate the force exerted on each wall:
F = (200 x 10^9 Pa) x (0.1 x 0.05 m^2) x (1.2 x 10^-5 /°C) x (11 °C) / 1 m
F ≈ 1320 N
Therefore, the bar would exert a force of approximately 1320 N on each wall if it is warmed from 20 °C to 31 °C.
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Related Questions
An observer measures a 100 Hz Doppler shift as an ambulance goes by. At rest, the frequency of the ambulance's siren is 2,000 Hz. What is the speed of the ambulance?
Answers
The change in the frequency of the sound, due to the relative motion of the source of sound and the observer, is determined by the Doppler's Effect.
The speed of the ambulance (source) is "6517 m/s"
The equation of Doppler's Effect is given as follows:
\(f_o = \frac{v+v_o}{v+v_s}f_s\)
where,
\(f_o\\\) = frequency of sound measure by observer = 100 Hz
v = speed of sound = 343 m/s
\(v_o\) = speed of observer = 0 m/s
\(v_s\) = speed of ambulance (source) = ?
\(f_s\) = actual frequency = 2000 Hz
Therefore, using the values, we get:
\(100\ Hz = \frac{343\ m/s + 0\ m/s}{343\ m/s + v_s}(2000\ Hz)\\\\(100\ Hz)(343\ m/s + v_s) = (343\ m/s)(2000\ Hz)\\\\v_s = \frac{686000\ Hz.m/s - 34300\ Hz.m/s}{100\ Hz}\)
v_s = 6517 m/s
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How do you write an inverse variation equation given X and Y?
Answers
The formula xy = k or y = kx can be used to represent an inverse variation. If a nonzero constant k exists such that xy = k or y = kx where x≠ 0, y ≠ 0, then y varies inversely as x.
What is inverse variation?A variable is inversely varying with respect to another variable when the term "inverse variation" is used. It symbolizes how two quantities are inversely related. This means that one variable is inversely proportional to another. Relationship in mathematics between two variables that can be described by an equation in which the sum of the two variables equals a constant.
As one quantity rises, the other falls for two quantities with inverse variation. For instance, as your speed increases while travelling to a specific location, it will take you less time to get there.
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what cause the death of stars？
Answers
Most stars take millions of years to die. When a star like the Sun has burned all of its hydrogen fuel, it expands to become a red giant then when it fully runs out it then dies
Answer:
. When the core runs out of hydrogen fuel, it will contract under the weight of gravity.
Explanation:
Pand S waves are both
waves.
1.longitudinal
2.surface
3.body
4.none of the above
Answers
Answer:
3.body
Explanation:
Both P and S waves are both body waves. Body waves are waves that travels through the earth.
P and S waves are elastic seismic waves that moves within the earth. Love and Rayleigh waves are surface waves that travels through the surface.
P waves is also known as primary waves S waves are known secondary waves.These waves are the first set of waves to arrive a seismic station before the surface waves are picked up.
what is the main function of an engine cut-off switch?
Answers
he wavelength of blue light is approximately 4.0 x 10 -7 meters. calculate the frequency of blue light in hertz. a. 2.5 x 10 7 b. 1.2 x 102 c. 3.3 x 10 -9 d. 7.5 x 1014 e. 1.2 x 10 1
Answers
The frequency of blue light in hertz is d.) 7.5 x 1014.
What is frequency of a light and how is it calculated?
The electromagnetic radiation differs from other radiations through frequency of that wave. Light is one of the forms of electromagnetic radiations. A hertz is said to be the number of oscillations in one second. For a wave, hertz is the number of wavelengths per second. All types of light travels at a same speed irrespective of their frequency.
The equation that relates frequency and wavelength is:
c= fλ
where, c= speed of light
λ = wavelength in meters
f= frequency in hertz
c= 3×10 8 m/s
λ = 4.0 x 10 -7 meters.
f=c/λ
⇒3×10 8 / 4.0 x 10 -7
⇒7.5 x 1014 Hz.
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what can be calculated by multiplying the voltage dropped across the resistor by the current flow through the resistor?
Answers
The power dissipated by the resistor, which is given by the formula P = V*I, where P is power, V is voltage, and I is current, can be calculated by multiplying the voltage dropped across the resistor by the current flow through the resistor.
This formula is known as Joule's law and it states that the power dissipated by a resistor is directly proportional to the voltage dropped across it and the current flowing through it. You can calculate the power dissipated by a resistor by multiplying the voltage dropped across the resistor by the current flow through the resistor. This is known as Joule's Law and is represented by the formula P = V x I, where P is power, V is voltage, and I is current.
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10. Josie and Trey were working on their physics project and both built catapults. Trey's catapult shot a ball
30 meters in 10 seconds, while Josie's catapult shot a ball 45 meters in 15 seconds. Whose catapult caused
the ball to move at a faster speed?
Answers
Answer:
Josie's ball faster than T
A 2. 9 kg model rocket accelerates at 15. 3 m/s2 with a force of 44 N. Before launch, the model rocket was not moving. After the solid rocket engine ignited, hot gases were pushed out from the rocket engine nozzle and propelled the rocket toward the sky. Which of Newton’s laws apply in this example? Select three options. The first law the second law the third law the fourth law the fifth law.
Answers
Answer:
The first law: the law of Inertia.
Explanation:
Newton’s first law states that if a body is at rest or moving at a constant speed in a straight line, it will remain at rest or keep moving in a straight line at constant speed unless it is acted upon by a force.
Answer:
1st, 2nd, & 3rd law
Explanation:
there is no 5th/4th law ppl
I did this question and it says SELECT 3 OPTIONS not 1 (This answer isn’t meant to be rude but just stating what the question says.)
an elementary student of mass m=34 kg is swinging on a swing. the length from the top of the swing set to the seat is L=4.7 m. the child is attempting to swing all the way around in a full circle.
-what is the minimum speed in meters per second the child must be moving with at the top of the path in order to make a full circle?
-assuming the child is traveling at the speed found in part a what is their apparent weight in newtons at the top of their path? (at the top, the child is upside-down)
-if the velocity at the very top is the same velocity from part a what is the childs apparent weight in newtons at the very bottoms of the path?
Answers
An elementary student of mass m=34 kg is swinging on a swing. the length from the top of the swing set to the seat is L=4.7 m.
a) The minimum speed the child must be moving at the top of the path in order to make a full circle is 9.14 m/s.
b) The apparent weight of the child at the top of the path is 1005.52 N.
c) The apparent weight of the child at the bottom of the path is 333.54 N.
We can solve this problem using the conservation of energy and the centripetal force equation.
(a) At the top of the swing, the child is momentarily at rest, so all of the kinetic energy has been converted to potential energy. All of the potential energy has been transformed into kinetic energy at the swing's bottom.
The minimum speed required at the top of the path to make a full circle is the speed at which the centripetal force required to keep the child moving in a circle is equal to the gravitational force pulling the child downward.
Setting the centripetal force and gravitational force equal, we have:
\(mv^2 / L\)= mg
where m is the mass of the child, v is the speed of the child at the top of the path, L is the length of the swing, and g is the acceleration due to gravity.
Solving for v, we get:
v = \(\sqrt{(gL) }\)= \(\sqrt{(9.81 m/s^2 * 4.7 m) }\)≈ 9.14 m/s
Therefore, the minimum speed the child must be moving at the top of the path in order to make a full circle is approximately 9.14 m/s.
(b) At the top of the path, the child is momentarily upside-down, so the apparent weight is the sum of the gravitational force and the centripetal force required to keep the child moving in a circle.
The gravitational force on the child is:
\(mg = 34 kg * 9.81 m/s^2 = 333.54 N\)
To keep the kid moving in a circle, you need to apply the following centripetal force:
\(mv^2 / L = 34 kg * (9.14 m/s)^2 / 4.7 m\) ≈ \(671.98 N\)
Therefore, the apparent weight of the child at the top of the path is approximately 1005.52 N (333.54 N + 671.98 N).
(c) At the bottom of the path, the child is moving at the same speed as at the top, so the centripetal force required to keep the child moving in a circle is the same. However, at the bottom of the path, the gravitational force is the only force acting on the child.
The gravitational force on the child is the same as in part (b):
mg = \(34 kg * 9.81 m/s^2 = 333.54 N\)
The centripetal force required to keep the child moving in a circle is:
\(mv^2 / L = 34 kg * (9.14 m/s)^2 / 4.7 m\) ≈ \(671.98 N\)
Therefore, the apparent weight of the child at the bottom of the path is approximately 333.54 N (equal to the gravitational force).
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Please help me with the blanks
Answers
Answer:
wavelength and frequency
Explanation:
wavelength is the distance between waves while frequency is the number of times in which the wave occurs.
streams of protons and electrons emitted from the sun produce ________.
Answers
Streams of protons and electrons emitted from the Sun produce the solar wind. The Sun continuously emits a stream of charged particles, mainly protons and electrons, known as the solar wind.
These particles are accelerated by the Sun's intense heat and magnetic field. As they travel through space, the solar wind interacts with planetary magnetic fields and the Earth's magnetosphere, causing various effects such as auroras and geomagnetic storms. The solar wind also carries energy and plays a crucial role in shaping the space environment within our solar system. It has implications for space weather and can impact satellites, spacecraft, and other technological systems.
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Calculate the TOTAL mechanical energy of pendulum is it swings from his highest point to its lowest point. Pendulum mass is 4 kg. Use your equations for gravitational potential energy and kinetic energy to determine these values based on the data given below. Total energy is the sum of gravitational potential energy and kinetic energy. In this problem, round gravity to: g = 10 m/s^2.
Answers
Answer:
its should be 2.0 and 4.5 on it
Heat is added to 0.81 kg of ice at -14 °C. How many kilocalories are required to change the ice to steam at 144 °C? Hint: This involves two phase changes and heating the ice water and steam.
Answers
The heat (in Kilocalories) required to change 0.81 kg of ice at -14 °C to steam at 144 °C is 606.69 kilocalories
How do i determine the heat (in Kcal) required?First, we shall obtain the heat required to change the ice from -14 ˚C to 0 °C. Details below:
Mass of ice (M) = 0.81 Kg = 0.81 × 1000 = 810 gInitial temperature of ice (T₁) = -14 °CFinal temperature of water (T₂) = 0 °CChange in temperature of water (ΔT) = 0 - (-14) = 14 °CSpecific heat capacity of ice (C) = 0.5 cal/g°CHeat (H₁) =?H₁ = MCΔT
= 810 × 0.5 × 14
= 5670 cal
Next, we shall obtain the heat needed to melt the ice. Details below:
Mass of ice (m) = 810 gLatent heat of fusion (ΔHf) = 80 cal/gHeat (H₂) =?H₂ = m × ΔHf
= 810 × 80
= 64800 cal
Next, we shall determine the heat required to change the water from 0 °C to 100 °C. Details below:
Mass of water (M) = 810 gInitial temperature of water (T₁) = 0 °CFinal temperature of water (T₂) = 100 °CChange in temperature of water (ΔT) = 100 - 0 = 100 °CSpecific heat capacity of water (C) = 1 cal/g°CHeat (H₃) =?H₃ = MCΔT
= 810 × 1 × 100
= 81000 cal
Next, we shall determine the heat needed to vaporize the water. Details below:
Mass of water (M) = 810 g Heat of Vaporization (ΔHv) = 540 cal/gHeat (H₄) =?H₄ = m × ΔHv
= 810 × 540
= 437400 cal
Next, we shall determine the heat required to change the steam from 100 °C to 144 °C. Details below:
Mass of steam (M) = 810 gInitial temperature of steam (T₁) = 100 °CFinal temperature of steam (T₂) = 144 °CChange in temperature of steam (ΔT) = 144 - 100 = 44 °CSpecific heat capacity of steam (C) = 0.5 cal/gºC Heat (H₅) =?H₅ = MCΔT
= 810 × 0.5 × 44
= 17820 cal
Finally, we shall determine the heat required to change the ice from -14 ˚C to steam at temperature of 144 ˚C Details below:
Heat required to change the ice from -14 ˚C to 0 °C (H₁) = 5670 calHeat required to melt the ice (H₂) = 64800 calHeat required to the water from 0 °C to 100 °C (H₃) = 81000 calHeat required to vaporize the water (H₄) = 437400 calHeat required to change the steam from 100 °C to 144 °C (H₅) = 17820 calTotal heat required (Q) =?Q = H₁ + H₂ + H₃ + H₄ + H₅
= 5670 + 64800 + 81000 + 437400 + 17820
= 606690 cal
Divide by 1000 to express in kilocalories
= 606690 / 1000
= 606.69 kilocalories
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A car traveled 60km in 45 min.What is the cars average speed in km/hr
Answers
Given that,
Distance = 60 km
Time = 45 min
To find,
The average speed of the car.
Solution,
Average speed of an object is equal to the total distance divided by total time taken.
45 min = 0.75 hour
It can be given as :
\(V=\dfrac{60\ km}{0.75\ h}\\\\=80\ km/h\)
Therefore, the average speed of the car is 80 km/hr.
What is the resistance of a 150 W light bulb running on a 120 V circuit 
Answers
Answer:
96 Ω
Explanation:
Given:
U = 120 V
P = 150 W
Find: R - ?
\(r = \frac{ {u}^{2} }{p} \)
\(r = \frac{ {120}^{2} }{150} = 96 \: Ω\)
A rock is thrown with an initial velocity of 6 m/s at an angle of 30
degrees. What is the initial velocity of the rock in the x-
direction?
Answers
Answer:
6.9 m/s
Explanation:
Explain briefly the trnsmission of radio waves
Answers
Answer: A radio wave is generated by a transmitter and then detected by a receiver. An antenna allows a radio transmitter to send energy into space and a receiver to pick up energy from space. Transmitters and receivers are typically designed to operate over a limited range of frequencies.
Explanation:
A 0. 400-kg rock is swung in a circular path and in a vertical plane on a 0. 5-m length string. At the top of the path, the angular speed is 10. 0 rad/s. What is the tension in the string at that point?.
Answers
That location has a 16.72 N string tension.
The acceleration at the bottom of the circle is merely normal (because there are no forces acting in the horizontal direction) and equal to the centripetal acceleration as follows:
ac = v2/r = 2*r T- m*g = m*2*r
The following is how we can solve for T using the givens as replacements:
T = m* (2*r+g) = 0.4 kg*((8.00)2 rad/sec2*0.5m)+9.8 m/s2) = 16.72 N.
What does angular vs. linear speed mean?The pace at which something rotates is its angular speed, which is measured in terms like r.p.m, degrees per seconds, etc. The linear speed is how quickly a point on the edge of an object moves in a circle around the item's center.
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how much force is required to lift a 49-newton object with an acceleration of 9.8 m/s2?
Answers
480.0 Newtons force is required to lift a 49-newton object with an acceleration of 9.8 m/s2/. The explaination is mentioned below:
To calculate the amount of force required to lift a 49-newton object with an acceleration of 9.8 m/s2, we need to use the formula F = ma, where F is the force required, m is the mass of the object (in this case, 49 newtons), and a is the acceleration (in this case, 9.8 m/s2).
Plugging in the values, we get:
F = 49 x 9.8
F = 480.2 Newtons
Therefore, the amount of force required to lift a 49-newton object with an acceleration of 9.8 m/s2 is 480.2 Newtons.
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The reason type ia supernovae are useful to astronomers for determining distances to other galaxies is that?
Answers
Answer:
Because these supernovae are formed by white dwarfs that explode when they reach a uniform accreted mass, the supernova peak luminosity is thought to be very consistant. This consistancy allows these supernovae to be used as standard candles to measure distances.
x-ray radiation falls in the wavelength region of 1.00e-11 to 1.00e-8 meters. what is the energy of x-ray radiation that has a wavelength of 8.39e-10 m?
Answers
The energy of the X-ray radiation will be 2.36 x 10⁻¹⁶ Joules.
The X-ray radiations fall under the wavelength range of 10⁻¹¹ m to 10⁻⁸ m.
Provided to us is the X-ray radiation of wavelength 8.39 x 10⁻¹⁰ m
For calculating the energy of the radiation we first need to calculate the frequency of the X-ray radiation
We know that frequency = speed of light / wavelength
Ʋ = c / λ
Ʋ = 3 x 10⁸ / 8.39 x 10⁻¹⁰
Ʋ = 0.357 x 10¹⁸
Now we know that the energy can be written as
E = h Ʋ
Where h = planck's constant and has a value of 6.626 x 10⁻³⁴ Js
therefore ,
The energy of the radiation is
E= 6.626 x 10⁻³⁴ x 0.357 x 10¹⁸
E = 2.36 x 10⁻¹⁶ J
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Newton’s 2nd law gives us this formula F = ma. What force would be needed to accelerate a 20 kg object 5 m/s/s?
Answers
Answer:
100N
Explanation:
Given parameters:
Mass = 20kg
Acceleration = 5m/s²
Unknown:
Force needed to cause the acceleration = ?
Solution:
According to Newton's second law of motion, force is the product of mass and acceleration.
Force = ma
m is the mass
a is the acceleration
Now insert the parameters and solve;
Force = 20 x 5 = 100N
Please help 2.
The morning of a birthday party, a balloon is filled with 8.5 L of helium (He) when the temperature is
294 kelvin. The party starts at 4:00 p.m., at which time, the temperature has risen to 305 kelvin. What is
the new volume of the balloon?
Answers
Answer:
The new volume of the balloon is 8.8 L
Explanation:
Charles's Law consists of the relationship between the volume and the temperature of a certain amount of ideal gas, which is kept at a constant pressure. This law establishes that the volume is directly proportional to the temperature of the gas, that is to say that if the temperature increases, the volume of the gas increases and that on the contrary if the temperature of the gas decreases, the volume decreases.
In other words, Charles's law states that when the amount of gas and pressure are kept constant, the ratio between the volume and the temperature will always have the same value:
\(\frac{V}{T}=k\)
Having a certain volume of gas V1 that is at a temperature T1, by varying the volume of gas to a new value V2, then the temperature will change to T2, and it will be fulfilled:
\(\frac{V1}{T1}=\frac{V2}{T2}\)
In this case:
V1= 8.5 LT1= 294 KV2= ?T2= 305 KReplacing:
\(\frac{8.5 L}{294 K}=\frac{V2}{305 K}\)
Solving:
\(V2=305 K*\frac{8.5 L}{294 K}\)
V2=8.8 L
The new volume of the balloon is 8.8 L
7. Our state of mind affects how we observe our surroundings. What
mental state is the best for observing?
I
a) happy
c) nervous
b) relaxed d) excited
Answers
A helicopter, starting from rest, accelerates straight up from the roof of a hospital. The lifting force does work in raising the helicopter. An 730-kg helicopter rises from rest to a speed of 8.5 m/s in a time of 3.8 s. During this time it climbs to a height of 8.1 m. What is the average power generated by the lifting force?
Answers
The work done by the lifting force is equal to the change in potential energy. When an object is lifted to a certain height, its potential energy increases by an amount equal to mgh where m is the mass of the object, g is the acceleration due to gravity and h is the height to which it is lifted.
In this case, the helicopter is lifted by a distance of 8.1 m. Therefore, the work done by the lifting force is given byW = mghWhere m = 730 kg, g = 9.8 m/s² and h = 8.1 m Substituting the given values, we getW = (730 kg) × (9.8 m/s²) × (8.1 m)W = 57,204 JThe average power generated by the lifting force is given byP = W/twhere t is the time taken to rise to a speed of 8.5 m/s. In this case, t = 3.8 s.
Substituting the given values, we getP = 57,204 J/3.8 sP = 15,054 W Therefore, the average power generated by the lifting force is 15,054 W. In this case, the helicopter is lifted by a distance of 8.1 m. Therefore, the work done by the lifting force is given byW = mgh Where m = 730 kg, g = 9.8 m/s² and h = 8.1 m
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A student wants to build a simple circuit. Which material would be used to design a circuit with the last amount of resistance?
A. Long wires with a large diameter
B.Long wires with a thin diameter
C.Short wires with a large diameter
D.Short wires with a thin diameter
Answers
Answer:
C
Explanation:
The shorter a wire, the less it will be worn down from moving around, and the thicker the wire, the longer it will last.
Short wires with a wide diameter will be the material utilized to build a circuit with the minimum amount of resistance. Then, C is the right answer.
What is the circuit?Electrical devices such as resistance, transistors, capacitors, inductors, and diodes are connected via conductive wires or traces that allow the electric current to pass between them.
A closed-loop system in which electrons can move is called a circuit. Electricity is supplied to the circuit by an electricity source, such as a battery. No electrons will travel till the circuit is finished, that is, it goes full round back to the electricity source.
A student wants to build a simple circuit.
The material would be used to design a circuit with the least amount of resistance will be short wires with a large diameter. Then the correct option is C.
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The emf produced by an ac generator is given by ε = ωNBA sin ωt. In the SI system, what is the value of ω for a frequency of 60.0 Hz?
A. 60.0 Hz
B. 120 rad/s
C. 2.00π rad/s
D. 377 rad/s
E. 377 Hz
Answers
The emf produced by an ac generator is given by ε = ωNBA sin ωt. In the SI system, what is the value of ω for a frequency of 60.0 Hz.
Explanation:
The angular frequency ω for a frequency of 60.0 Hz is given by;ω = 2πf,
where f is the frequency of the wave. Substituting f=60.0 Hz;ω = 2πf = 2π(60.0) = 120π rad/s.
The value of ω for a frequency of 60.0 Hz in the SI system can be calculated using the formula ω = 2πf, where f is the frequency.
Step 1: Identify the given frequency (f) as 60.0 Hz.
Step 2: Plug the value of f into the formula ω = 2πf.
Step 3: Calculate ω as ω = 2π(60.0 Hz).
ω = 2π(60.0) = 120π rad/s ≈ 377 rad/s.
So, the correct answer is D. 377 rad/s.
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upon what data do measurements of sizes of eclipsing binaries depend?
Answers
The measurements of sizes of eclipsing binaries depend on data such as light curves, radial velocity curves, and inclination of the orbital plane.
Eclipsing binaries are a type of binary star system in which two stars orbit around each other and periodically pass in front of each other, causing periodic variations in the system's brightness as seen from Earth. These variations are known as light curves and can be used to measure the sizes of the stars.
The analysis of the light curve involves measuring the depth and duration of the eclipses, as well as the shape of the light curve between eclipses. By comparing these measurements to theoretical models of eclipsing binaries, astronomers can determine the sizes and other physical properties of the stars in the system.
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Halp meeeeeeeeeeeeeeeeee
Answers
Answer:
1º all
2º 1
3º 2
4º the same
Explanation: