The cross-sectional area of the lead bar is [tex]9.188 \times 10^{-4} \ m^2[/tex].
Young's modulus of lead barThe Young's modulus (E)of lead bar is given as 1.6 x 10¹⁰ Pa.
Cross-sectional area of the barThe cross-sectional area of the bar is calculated as follows;
[tex]E = \frac{stress}{strain} = \frac{F/A}{e/l} = \frac{Fl}{Ae} \\\\A = \frac{Fl}{Ee}[/tex]
where;
A is cross-sectional areaF is applied force due to its weightE is Young's moduluse is compressionl is length[tex]A = \frac{(mg) l}{Ee} \\\\A = \frac{(10^3 \times 9.8) \times 3}{1.6 \times 10^{10} \times 2 \times 10^{-3}} \\\\A = 9.188 \times 10^{-4} \ m^2[/tex]
Thus, the cross-sectional area of the lead bar is [tex]9.188 \times 10^{-4} \ m^2[/tex].
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Help me pls, I need it now
6.) a
7.) d
8.) b
9.) b
10.) a
1. a
2. d
3. b
4. b
5. a
[tex] \: \: [/tex]
Rick's car has a mass of 1000 kg and its brakes can apply 8000 N of force. If he is driving at 32 m/s and sees something in the road suddenly, how long will it take his car to come to a stop? Use the equation below to help you.
Answer:
Given:
m=1000kg
F=8000 N
u=32m/s
v=0m/s
Required:
T=?
Solution:
F=m × a
8000N = 1000kg × a
a = 8m/s^2
Since it's deceleration -8m/s^2
a= v - u / t
-8m/s^2 = 0 - 32m/s / T
T = 4 s
Hence the car takes 4sec to stop
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The stopping time of the car is equal to 4 seconds.
What is speed?Speed is defined as the ratio of the time distance travelled by the body to the time taken by the body to cover the distance. Speed is the ratio of the distance travelled by time. The unit of speed in miles per hour.
Given that,
m=1000kg
F=8000 N
u=32m/s
v=0m/s
The acceleration will be calculated by the formula below,
F = m × a
8000N = 1000kg × a
a = 8 m/s²
Since its deceleration -8m/s². The time taken is calculated by the formula,
a= v - u / t
-8= (0 - 32 ) / t
t = 32 / 8
t = 4 seconds
Therefore, the stopping time of the car is equal to 4 seconds.
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i need help question confuseing
Answer:
could you tell me what the question is pls, that way I can help you
Explanation:
right answer gets brainliest, wrong answer gets ignored
The star Sirius has a temperature of 10,700 degrees Celsius and has a luminosity of 23 solar luminosity units. At which letter on the HR Diagram would you place Sirius?
Answer:
A
Explanation:
Because A looks like it's in the 10,700 degree area and also in the 23 luminosity area.
(06.02 MC)
What can a scientist use to observe very small things?
Answer:
microscopic light or Nano technology
Is this an example of outline??And why?
Answer:
Yes
Explanation:
You included all the stages of matter and described each of them. You're outlining their properties and you've created a clear diagram (and by diagram I mean chart) of solids, liquids, and gas.
what force is required to acceleration a body with a mass of 32 kilograms at a rate of 12 m/s
Answer:
384 N
Explanation:
F=m×a
F= ?
m= 32kg
a= 12m/s
32×12 = 384 N
N is newton's
hope this helps
How many neutrons are in He
Which car is faster A or B
Answer:
A
Explanation: Car A is the fastest
what is the kinetic energy of an object that has a mass of 12 kg and moves with a velocity of 10 m/s
Answer:
600 J
Explanation:
The formula to find the kinetic energy of an object is [tex]\frac{1}{2}mV^2[/tex]
m = mass in kgV = velocity in m/sKE is measured in Joules just as all other forms of energy.Now, let's plug in the variables we're given and simplify.
[tex]\frac{1}{2}(12)(10)^2[/tex] [tex]\frac{1}{2}(12)(100)[/tex] [tex](6)(100)[/tex] [tex](600)[/tex]Thus, the answer is 600 Joules.
Okay the question is calculate the current when 1200C of charge flows through a wire in 200 s.
Hi there!
Using the equation for current:
[tex]I = \frac{\Delta Q}{\Delta t}[/tex]
I = Current (A)
Q = Charge (C)
t = time (s)
Therefore, the current is equivalent to the amount of charge passing through a wire over a given time interval.
We can plug in the given values and solve.
[tex]I = \frac{1200}{200} = \boxed{6 A}[/tex]
Which one is true ?????
Answer:
b. horizontal distance/time graph
Explanation:
d is incorrect because object is moving at the same pace the entire time
Devon is riding his bicycle at 15 m/s. How far will he travel in 12 s?
How does the evolutionary process contradict the second law of thermodynamics?
Calculate how long it takes Neptune in earth years for one trip around the sun by using an average Sun-Neptune distance of 30 A.U. ( ) 0.735 earth years Show calculation: ( ) 1.84 earth years ( ) 3.37 earth years ( ) 164 earth years
Answer:
164 earth years
Explanation:
By Kepler's third law
r³/T² = constant
(30 A.U)³/T² = (1 A.U.)³/(1 earth year)²
so T = 30^1.5 = 164 earth years
A proton high above the equator approaches the
Earth moving straight downward with a speed of
365 m/s.
Find the acceleration of the proton, given that the magnetic field at its altitude is 4.10*10^-5 T.
We can see from the calculations that the acceleration of the proton is 1.43 * 10^7 ms-2.
What is acceleration?Acceleration is the rate of change of velocity with time. We know that the magnetic force is obtained by;
F = qvB
q= 1.6 * 10^-19 C
v = 365 m/s
B = 4.10*10^-5 T
F = 1.6 * 10^-19 C * 365 m/s * 4.10*10^-5 T
F = 2.39 * 10^-20 N
Recall that the mass of the proton is 1.67 × 10−27 kg hence
a = F/m = 2.39 * 10^-20 N/1.67 × 10−27 kg = 1.43 * 10^7 ms-2
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What is the average power consumption in watts of an appliance that uses 5.00 KW.h of energy per day?
Brainliest if correct
Answer:
the answer is C. rocket 4.
Explanation:
[tex]a = \frac{f}{m} \\ \\ c) a = \frac{120}{3.25} = 36.923...[/tex]
it's the biggest amongst the four.
rocket one has an acceleration of 34.782...
rocket two has an acceleration of 22.429...
rocket three has an acceleration of 26.666...
rocket four has an acceleration of 36.923
Which of the following states that energy cannot be created or destroyed?
Answer:
germany
Explanation:
The pressure on a volume of liquid V = 1.0 mº at the surface is approximately equal to the atmospheric pressure Patm = 1.00 x 105 N/m2. If this volume of liquid is now
placed at a depth where the pressure is P = 2.30 x 10' N/m², what will be the change in volume of the liquid (in mº)? The bulk modulus of the liquid is 8.0 x 100 N/m².
(Include the appropriate sign with your answer.)
m
Additional Materials
Answer:-2.86*10⁻⁴
Explanation: Use the equation change in volume = (change in pressure * original volume) / Bulks Modulus. ΔV = (-Δp*V₀) / B
Plugging in your numbers, you should get ΔV = (-2.29*10⁷*1) / (8*10¹⁰) = -2.86*10⁻⁴
ΔP = P₂-P₁ ----> ΔP = 2.30*10⁷ - 1.00*10⁵ = 2.29*10⁷
i need help on a english book report
Answer:
I can help, but
Explanation:
Where is the question?
A 2kg rock is at the edge of a cliff 20m above the surface of a lake. It comes loose and falls. Half way down it is falling at 14 m/s. What is its Kinetic Energy at the half way point?
Please show work!
Answer:
196 Joules
Explanation:
kinetic energy = 1/2 * mass * velocity²
Given:
mass: 2 kgvelocity: 14 m/susing formulae:
[tex]\rightarrow \sf kinetic \ energy = \dfrac{1}{2} * 2 * 14^2[/tex]
[tex]\rightarrow \sf kinetic \ energy = 196 \ J[/tex]
what negative influences must be avoided to be able to achieve your goal mention at least 3
The negative influences that must be avoided in order to achieve your goal are excuses, procrastination and distractions.
What is negative influence?A negative influence is someone or something that induces negative or bad action in someone. This bad influence can create bad energy within and corrupt good mind.
Three negative influence to avoidAvoid excusesAvoid procrastinationAvoid distractions.Thus, the negative influences that must be avoided in order to achieve your goal are excuses, procrastination and distractions.
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A student shines a mixture of red and blue light onto a blue toy car what color will the car appear to have explain your answer
Answer:
If we use a mixture of red and blue light, the blue toy car might reflect deep magenta color. If the toy car is made up of metal, it might reflect glittery magenta color. If the intensity of the blue color is greater, the toy car might show dark blue color
Explanation:
is this right please let me know:D
Help me pls, ASAP..
____1. These are motion graphs that show a change in an object’s location over time.
____2. It can show us if an object is going backwards or forwards (direction).
____3. These are useful and effective tools in visually presenting the motion of objects.
____4. It is the line of dots on the tape that is created when a long tape is attached to
an object that is moving.
____5. It is a periodic disturbance that moves away from a source and carries energy with it.
____6. It is the maximum displacement of a particle of the medium on either side of its
normal position when the wave passes.
____7. It is a measurement of how fast the sound wave vibrates.
A. Amplitude
B. Displacement-time graph
C. Frequency
D. Motion graphs
E. Position-time graphs
F. Ticker tape diagram
G. Wave
[tex] \qquad \huge \underline{ \boxed{\sf Answer}}[/tex]
Here's the correct choices for the blank questions~
# 1 : position - time graph
#2 : Displacement - time graph
#3 : Motion graphs
#4 : Ticker tape diagram
#5 : Wave
#6 : Amplitude
#7 : Frequency
The answers to the questions are as follows :
Position time graphs ( E ) Displacement time graph ( B )Motion graphs ( D )Ticker tape diagram ( F ) Wave ( G ) Amplitude ( A ) Frequency ( C ) The different types of motion graphsPosition time graphs are motion graphs that show the change in an object position in relation to time traveled, while a displacement time graph shows if an object is going backwards or forward and unlike distance, she does not consider the direction of movement of an object.
Motion graphs are used for the presentation of the motion of objects visually.
Hence we can conclude that the answers to your questions are as listed above.
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The speed of sound is measured to be 336 m/s on a certain day. What is this measurement in kilometers per hour
Answer:here’s how you do it
Explanation:
)Which will likely produce a greater amount of static charge: a wool sweater worn under a cotton jacket, or a wool sweater worn under a rubber rain coat? Why?
A wool sweater worn under a cotton jacket produces more static charges.
What is static charge?Static charge is an imbalance of electric charges within or on the surface of a material or between materials.
Static charges can be produced by two materials together (friction method).
A wool sweater worn under a cotton jacket (in the absence of lubricant like water) creates friction which enables more static charge to be produced.
Thus, a wool sweater worn under a cotton jacket produces more static charges.
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A 2-kg block is thrown upward from a point 20 m above the Earth's surface. At what height above Earth's surface will the gravitational potential energy of the Earth-block system have increased by 500 J?
Answer:
45.5 m
Explanation:
m = 2 kg, h = 20 m, E = 500 J, radius of earth = R, mass of earth = M
find the new height H
at h, the potential energy = -GMm/(R + h)
at H, the potential energy = -GMm/(R + H)
increase of the potential energy
= [-GMm/(R + H)] - [-GMm(R + h)]
= GMm[1/(R + h) - 1/(R + H)] = E
1/(R + h) - 1/(R + H) = E/(GMm)
(H - h)/[(R + H)(R + h)] = E/(GMm)
R + h ≈ R, R + H ≈ R
so (H - h)/R² = E/(GMm)
H - h = ER²/(GMm)
note GM/R² = g = 9.81 m/s²
so H - h = E/(mg)
H = h + E/(mg) = 20 + 500/(2*9.81) = 45.5 m
In scientific terms, anything that represents something else is called a
O theory
O model
O hypotnesis
O chemical bond
Question #1
Given the free body diagram below, which direction will the object accelerate? Assume that the length of
Fair is the same as Fapp.
Given the diagram provided, we can confirm that the object will accelerate in a downward direction.
Why will it accelerate downwards?The free-body diagram shows us the forces that are acting on this object. Through this diagram, we can see that the forces on the left and right of the object are balanced, meaning that there will not have movement in either of these directions.
The diagram shows that the downward force being applied is not balanced by an opposite force, so the object will accelerate in this direction.
Therefore, we can confirm that object will accelerate in a downward direction due to its downward force not being balanced by an opposing force.
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