Answer:
0.68 m
Explanation:
α = dL / L1*(dT)
dL = L1(dT) * α
Initial length, L1 = 100
Chang in Length =dL
α linear expansivity ; dL = change in length ; dT = change in temperature ; L1 = initial length
α of iron rod = 1.13 * 10^-5 k
dL = 100(40 - 10) * 1.13 * 10^-5
dL = 100(30) * 1.13 * 10^-5
dL = 3000 * 1.13 * 10^-5
dL = 3390 * 10^-5
dL = 0.0339 m
Error :
Distance measured = 2km = (2 * 1000) = 2000m
[Distance measured / (initial length + change in length)] × change in length
Error = (2000 / (100 + 0.0339)) * 0.0339
Error = (2000 / 100.0339) * 0.0339
Error = 19.993222 * 0.0339
Error = 0.6777702
Error = 0.68 m
3. A 3.0 g bullet traveling at a speed of 400 m/s enters a tree and exits the other side with a speed of 200 m/s. Where did the I bullet's lost KE go, and what was the energy transferred? Solution:
Answer:I had two questions: 1) Shouldnt the equation be : Change of internal energy= Change in Ke or KEi +Ui=KEf+Uf .. I cant seem to understand how the change in KE+ Change in Internal Energy equals 0 2) Also, it has a note which says that if the bullet alone was chosen as a system, then work would be done on it and the heat transfer woudl occur. How would one formulate an equation for this?
Explanation:
What is the net force EF?
Answer:
Physics Net Force
Explanation:
Physics Net Force
The net force is the combined force of all individual forces acting on an object. Newton's First Law can be seen to be the special case in the Second Law when F, the net force, is zero. When that happens, the acceleration a must also be zero.
Hope this helped you!!
i need help with this i don’t understand
Answer:
I TOO DONT UNDERSTAND ☹☹☹☹✌✌✌
What must occur to produce electric current?
A tennis ball launcher works by using a spring to
propel the ball forward.
One model of tennis ball launcher has
advertised that it is capable of imparting
15,000 J of kinetic energy to a 0.5 kg ball
initially at rest. A student carefully measures the
compression of the spring to be 0.10 m.
What is the value of the spring constant for the
tennis ball launcher according to the data
provided?
Answer:
3MN/m
Explanation:
Step one:
given data
Kinetic Energy KE=15,000J
mass m= 0.5kg
compression x= 0.1m
Step two:
The expression for the energy stored in spring is
[tex]KE= 1/2ke^2\\\\15000=1/2 *k*0.1^2\\\\15000=1/2*k*0.01\\\\15000=0.005k\\\\[/tex]
divide both sides by
0.005
[tex]k= 15000/0.005\\\\k=3000000\\\\k= 3MN/m[/tex]
From conservation of energy, the value of the spring constant for the tennis ball launcher according to the data is 3 x [tex]10^{6}[/tex] Nm
The work done by a tennis ball launcher by using a spring to propel the ball forward is equal to the kinetic energy which is 15,000 Joule. That is,
W = K.E
The given parameters are:
K.E = 15,000 J
Mass m = 0.5 kg
compression x = 0.1 m
The elastic potential energy on the spring will be equal to the work done by the tennis ball launcher. That is,
E = W
since W = K.E
E = K.E
1/2k[tex]x^{2}[/tex] = 1/2m[tex]v^{2}[/tex] = 15,000
1/2k[tex]x^{2}[/tex] = 15000
Substitute for 0.1 for x
1/2 K ([tex]0.1^{2}[/tex]) = 15000
[tex]0.1^{2}[/tex] K = 30000
K = 30000/0.01
K = 3 x [tex]10^{6}[/tex] Nm
Therefore, the value of the spring constant for the tennis ball launcher according to the data is 3 x [tex]10^{6}[/tex] Nm
Learn more about Elasticity here: https://brainly.com/question/9821607
(I WILL GIVE OUT BRAINLIEST) Two objects were lifted by a machine. One object had a mass of 2 kilograms, and was lifted at a speed of 2 m/sec. The other had a mass of 4 kilograms and was lifted at a rate of 3 m/sec. Which object had more potential energy when it was lifted to a distance of 10 meters?
Answer:
Consinder the first body
[tex]potential \: energy = mgh \\ = 2 \times 10 \times 10 \\ = 200 \: joules[/tex]
Consider the second body
[tex]potential \: energy = mgh \\ = 4 \times 10 \times 10 \\ = 400 \: joules[/tex]
The body of mass 4 kg had the greater potential energy than the body of 2 kg
In a ballistics test at the police station an officer
shoots a 6.0g bullet at 350m/s into a wooden block. If
it takes 1.8ms for the bullet to stop, what is the
average force acting on the bullet as it stops? (Hint:
ms stands for milliseconds.)
The refraction of a wave is caused by a
change in
A. amplitude.
B. frequency
C. speed.
D. wavelength.
Answer:
C- speed
Explanation:
Refraction is the bending of waves caused by a change made in the speed which allows it to move from one medium to another.
Answer:
C. Speed of light
Explanation:
Refraction of light is caused due to change in the speed of light in different mediums. Refraction is the bending of the path of a light wave as it passes from one material into another material. The refraction occurs at the boundary and is caused by a change in speed of light wave upon crossing the boundary
Help me on question 5 pls I’m giving out brainlest!!
What is the relationship between the frequency of light and refraction?
Answer:
The refractive index of a medium is dependent (to some extent) upon the frequency of light passing through, with the highest frequencies having the highest values of n. It also changes the wave speed, frequency, and wavelength.. Although the wave slows down, its frequency remains the same, due to the fact that its wavelength is shorter. When waves travel from one medium to another the frequency never changes. As waves travel into the denser medium, they slow down and wavelength decreases
Explanation:
Answer:the higher the frequency the greater the index of refraction
Explanation:The index of refraction of any material besides vacuum varies slightly with the frequency of light too soo basically the more or higher the frequency the greater the refraction (index of refraction)
For example
Say you have green or red light which they have lower frequency that blue or purple
So the index of refraction will be lower
Identify how the energy flows up through the ecosystem. Describe how decomposers help to cycle matter in an ecosystem and their limitations?
Answer:
Decomposers are organisms that break down dead or decaying organisms, they carry out decomposition, a process possible by only certain kingdoms, such as fungi. Like herbivores and predators, decomposers are heterotrophic, meaning that they use organic substrates to get their energy, carbon and nutrients for growth and development. While the terms decomposer and detritivore are often interchangeably used, detritivores ingest and digest dead matter internally, while decomposers directly absorb nutrients through external chemical and biological processes. Thus, invertebrates such as earthworms, woodlice, and sea cucumbers are technically detritivores, not decomposers, since they must ingest nutrients - they are unable to absorb them externally.
Explanation:
how much power does it take to lift 30 kg 10n high in 5sec
Answer:
the answer is 60 w. i hope this helps
this is the last question
Answer:
It's C
Explanation:
convert 67km/hr to m/s
Answer:
answer is 18.6111
you can easily convert km/hr into m/s
just divide it by 3.6
A student wants to get real and inverted
image of same size as object. Which type of
mirror should be used and draw ray diagram
for this.
Answer:
concave mirror
Explanation:
A dart is thrown from 1.50 m high at 10.0 m/s toward a target 1.73 m from the ground. At what angle was the dart thrown?
Answer:
The angle of projection is 12.26⁰.
Explanation:
Given;
initial position of the dart, h₀ = 1.50 m
height above the ground reached by the dart, h₁ = 1.73 m
maximum height reached by the dart, Hm = h₁ - h₀ = 1.73 m - 1.50 m= 0.23 m
velocity of the dart, u = 10 m/s
The maximum height reached by the projectile is calculated as;
[tex]H_m = \frac{u^2sin^2 \theta}{2g}[/tex]
where;
θ is angle of projection
g is acceleration due to gravity = 9.8 m/s²
[tex]H_m = \frac{u^2sin^2 \theta}{2g}\\\\sin^2 \theta = \frac{H_m \ \times \ 2g}{u^2} \\\\sin^2 \theta = \frac{0.23 \ \times \ 2(9.8)}{10^2} \\\\sin ^2\theta =0.04508\\\\sin \theta = \sqrt{0.04508} \\\\sin \theta = 0.2123\\\\\theta = sin^{-1}(0.2123)\\\\\theta = 12.26^0[/tex]
Therefore, the angle of projection is 12.26⁰.
Can the distance coverd by a body ever be negative? What about its distance and displacement
answer in photo enjoy
You serve a volleyball with a mass of 1.4 kg. The ball leaves with a speed of 13 m/s. Calculate KE
Answer:
118.3 J
Explanation:
Givens:
m = 1.4 kg
V = 13 m/s
Formula for kinetic energy:
KE = (1/2)*(m)*(v)^2
KE = .5*(1.4 kg)*(13 m/s)^2
KE 118.3 J
J = Joules
do you know this???
ill give you 20 points
Answer:
it looks like B on the first one and D on the second hope this helps!!
Explanation:
A student lifts a basketball to a height of 6 feet and lets the ball drop to the ground. Which statement accurately compares the ball's energy at a height of 6 feet (at rest) and at a height of 2 feet (falling)?
A.
The ball's kinetic energy is the same at both heights, but its potential energy is different.
B.
The ball has less potential energy and more kinetic energy at 6 feet than at 2 feet.
C.
The ball's potential energy is the same at both heights, but its kinetic energy is different.
D.
The ball has more potential energy and less kinetic energy at 6 feet than at 2 feet.
Answer:C
Explanation:
If you are holding the ball that would be the ball would have potential energy since it it not moving. Once you drop the ball it will have kinetic energy since it’s moving. If you drop the ball from 6ft it will have more kinetic since it will have more time to accelerate. If you drop the ball from 2ft then it will have less kinetic energy since it is closer to the ground and won’t have beeping time to accelerate and get rid of the potential energy.
Answer:
c
Explanation:
Increase or decrease? 35 points ??? Please help
Answer:
increase, GPE, KE, KE, KE, PE, PE, KE, KE,
Explanation:
Which of the following is a layer of the solid Earth? A. convecting mantle B. Ring of Fire C. biosphere D. atmosphere
Answer:
It's a cause that's the last layer
Answer:
I believe the answer is A
Explanation:
It is not the ring of fire because the ring of fire is the result of tectonic plates moving. It is not the biosphere because biosphere is the regions of the surface. The convecting mantle is the solid layer of the Earth because the mantle is mostly solid. The atmosphere is a solid plastic layer of the Earth. I hope this helps.
Please help ASAP I’ll give brainly and 10 points
The mass of a box is 300 kg and it's base area is 15m². Calculate the pressure exerted by the box on the ground.
Answer:
• Mass, m = 300 kg
• Area, a = 15 m²
• Acceleration due to gravity, a = 9.8 m/s²
To Find :
• The pressure exerted by the box on the ground
Solution :
We know that,
★ Pressure = Force/Area
For calculation of Pressure we will have to find the force acquired first
From Newton's 2nd law of motion :
★ Force = Mass × Acceleration
→ F = 300 × 9.8
→ F = 2940 Newtons
Put the value of Force in the formula of Pressure :
→ Pressure =
→ Pressure = 196 Pascals
The pressure exerted by the box on the ground is 196 Pascals.
Which unit of measurement is most appropriate for measuring the length of your computer screen?
Answer:
Inches or Centimeters
Explanation:
Inches or centimeters are the most appropriate units of measurement for the computer screen because they are in the form of whole figures that can be easily comprehended. Usually the width of computer screens span from 10 to 20 inches.
Conversion of a 15inches computer to meters;
1inch=0.0254meter
15inches= ?
15inches*0.0254/1
=0.381meters
The above is a very small figure which might be hard for most people to fathom or visualize.
define watt and write how much watt is equal to one horse power
Answer:
A watt (W) is a joule (J) of energy used or produced per second. In 2010, the average US power use was 3.3 terawatts, or 3,300,000,000,000 watts. A horsepower is a unit of power. 1 horsepower (hp) is 745.7 watts.
extra info
How many watts does it take to make 1 horsepower?
746 watts !
One electric horsepower is equal to exactly 746 watts.
can someone help me with my qustions :(
A car is traveling at a velocity of 22 m/s when the driver puts on the brakes
to decelerate it at 1.4 m/s? over a distance of 110 m. What is the car's
velocity at the end of this distance?
Answer:
v = v +at = 22 + (1.6 6.8 s ms) = 33 ms
Explanation:
Suppose a pendulum starts with a potential energy of 100 J. Assuming the pendulum has a height of 0 m at the bottom of its swing, what is its maximum kinetic energy? Explain.
Answer:
100 J
Explanation:
What will most likely happen ifa light wave moves through a solid?
O It will increase in wavelength.
O It will decrease in speed.
O It will increase in speed.
O It will decrease in wavelength.
Which has the greatest amount of energy: ultraviolet rays, infrared rays, or
microwaves? (1 point)
Answer:
ultraviolet rays
Explanation:
It is because it have more photons.