Answer:
i) Hooke's Law works for some materials
ii) Hooke's Law only applies up to a certain force
iii) The force at which Hooke's Law stops working for springs is lower than for most materials
Explanation:
Hooke's Law of elasticity states that the deformation of an elastic material is proportional to the applied for small deformations
The law is applicable to elastic materials whose values of deformation or extension as well as the applied load or stress are expressible by a single real number
Hooke's Law is applicable when the force and the extension of the elastic material are proportional, at larger force, the elastic material is observed to expand more than as expected based on Hooke's Law
The nature of springs is such that its elastic limit is reached by a much lower force than for most materials. Therefore, Hooke's law stops working for springs at a lower force than for most materials.
A paratrooper jumping from the plane lands safely ,why?
A constant force of 4.5N acts on a 7.2 kg object for 10 s what is the change in the object velocity
Answer:
The change in the object's velocity is 6.25 m/s
Explanation:
Force
According to the second Newton's law, the net force exerted by an external agent on an object of mass m is:
F = ma [1]
Where a is the acceleration of the object.
On the other hand, the equations of the Kinematics describe the motion of the object by the equation:
[tex]v_f=v_o+at\qquad\qquad[2][/tex]
Where:
vf is the final speed
vo is the initial speed
a is the acceleration
t is the time
It's given a constant force of F=4.5 N acts on an object of mass m=7.2 kg. The object has an acceleration we can calculate solving [1] for a:
[tex]a=\frac{F}{m}[/tex]
[tex]a=\frac{4.5}{7.2}=0.625[/tex]
[tex]a=0.625\ m/s^2[/tex]
It's required con compute the change of velocity (or its magnitude, the speed). From [2]:
[tex]v_f-v_o=at[/tex]
The expression at the left side is the change of speed Δv:
[tex]\Delta v=at[/tex]
Knowing the time is t=10 s:
[tex]\Delta v=0.625*10[/tex]
[tex]\Delta v=6.25\ m/s[/tex]
The change in the object's velocity is 6.25 m/s
How high will the ball go? I would really appreciate a step by step answer!
Answer:
y = 3.26 [m]
Explanation:
In order to solve this problem, we must use the following equation of kinematics.
[tex]v_{f}^{2}= v_{o}^{2}-2*g*y[/tex]
where:
Vf = final velocity = 0
Vo = initial velocity = 8 [m/s]
g = gravity acceleration = 9.81 [m/s²]
y = elevation [m]
Note: The negative sign in the equation above represents that the movement is againts the direction of the gravity acceleration.
Now replacing:
[tex]0=8^{2} -2*9.81*y\\19.62*y=64\\y=3.26 [m][/tex]
An incandescent bulb is supplied with
100 J of energy every second and
transfers 5 J of energy by light
Calculate the efficiency of the bulb.
I need some help can you explain this to me please and thank you
Answer:
Efficiency = 5%
Explanation:
Given that,
Supplies energy to the bulb = 100 J
Transferred energy by the bulb = 5 J
We need to find the efficiency of the bulb. It can be given by "
[tex]\eta=\dfrac{\text{useful energy out}}{\text{useful energy in}}\times 100\\\\=\dfrac{5}{100}\times 100\\\\=5\%[/tex]
So, the efficiency of the bulb is 5%.
Does static electricity attract dead skin cells
Answer:
no i dont think so
Explanation:
Twins Jody and Taylor are rearranging the furniture in their bedroom and want to move a dresser across the room. The dresser has a sliding force of 90N. Jody can push with a force of 55N and Taylor can push with a force of 38N. What is the Net Force? Can the twins move the dresser across the room? Explain why in complete sentences and show all math work to support your answer.
Plz help this is due in 5 days ;-;
Answer:
yes, They will be able to move the dresser.
Explanation:
sliding force 90N
55N + 38N = 93N
therefore, yes the twins can move the dresser
In what direction do the velocity vectors point in circular motion?
The velocity vector is always perpendicular to the radius. By radius, I mean the inward centripetal force that pulls the object to continue on its curved path. Without this inward force, the object would continue on a straight path tangential to the curve it was previously on.
A student wants to use all of the appliances at the same time so plugs them in to a multiway socket.
The socket has a maximum safe current of 30A and the mains electricity is 230V.
a. Is it safe to use all five appliances at once?
Explain your answer showing your use of the equation
Answer:
The answer would be no
Explanation:
because the voltages are so high, we can assume that 5 appliances divided up between the voltages would not be safe to use together and would ultimately cause the circuits to overload
the distance between pole and position of image can denoted by___
a)u. b)v. c)R. d)C
Answer:
b) v
Explanation:
the distance between pole and position of image can denoted by v
1. Two vectors have magnitudes 6 & 8 units, respectively. Find the maximum &
minimum resultant vectors.
nitsdoftboltant fuo vectors acting in the same direction is 20
Answer:
The maximum magnitude of their resultant is 14 units, and the minimum is 2 units
Explanation:
Resultant Vectors
When two or more vectors are added or subtracted, the resultant vector can be found by considering their magnitudes and directions.
Two vectors applied to the same point can produce a result that can vary from being completely collaborative or completely opposite.
If two vectors act in a collaborative form, their magnitudes are added and the result has the maximum possible magnitude. If they act in opposite directions, the result has the minimum possible magnitude.
Thus, being 6 and 8 units the magnitudes of the vectors, the maximum magnitude of their resultant is 14 units, and the minimum is 2 units.
the height has a distance of 2.5 seconds to hit the ground what is gravity?
Answer:
11 times
Explanatiom:
756 fourty
For this graph to the right, what is the
velocity of the object? Show your work.
I dont see a mark where it is, if there was a line it would be marking the constant speed of it. There is just time(s) which probably stands for speed, and position(m) which probably stands for miles. There is a measurement of 50, down to 10. Please give me more explanation to this question and I may be able to help!
You are driving at 30.0 m/s on a freeway curve of radius 25.0 m. What is the magnitude of your acceleration?
Answer:
36.0 m/s^2
Explanation:
The magnitude of your acceleration is equal to 36.0 [tex]m/s^2[/tex].
Given the following data:
Radius, r = 25.0 meters. Speed, V = 30.0 m/s.To calculate the magnitude of your acceleration:
Mathematically, the centripetal acceleration of an object is given by this formula:
[tex]A_c = \frac{V^2}{r}[/tex]
Where:
[tex]A_c[/tex] is the centripetal acceleration.r is the radius of the circular track.V is the velocity of an object.Substituting the given parameters into the formula, we have;
[tex]A_c = \frac{30.0^2}{25.0}\\\\A_c = \frac{900}{25.0}[/tex]
Centripetal acceleration = 36.0 [tex]m/s^2[/tex]
Read more on centripetal acceleration here: https://brainly.com/question/2788500
_____ is the sum of all potential and kinetic energy.
Group of answer choices
Law of Conservation of Energy
Gravitational Potential Energy
Stored energy
Mechanical Energy
Answer:
mechanical energyis the sum of all potential and kinetic energy.hope it helps!
force of 4 Newtons in 20 power output? 40 Nm/sec 2 Nm 2 Nm/sec 1
Answer:
P = 0.2 W
Explanation:
Given that,
Force, F = 4 N
Displacement, d = 1 m (say)
Time, t = 20 s
We need to find the power output. Power is the rate of doing work. So,
P = W/t
[tex]P=\dfrac{Fd}{t}\\\\P=\dfrac{4\times 1}{20}\\\\P=0.2\ W[/tex]
So, the required power is 0.2 W.
Calculate Density:
Volume=43cm3, Mass=45g
Answer:
P= 1.04651 g/cm3
Explanation:
Zach drives his car around a circular section of a road having a radius of 50 meters at a constant speed of 20 m/s. What is the centripetal acceleration of Zach's car?
Answer:
Centripetal acceleration = 8m/s²
Explanation:
Given the following data;
Radius, r = 50m
Velocity, v = 20m/s
To find centripetal acceleration;
Centripetal acceleration = v²/r
Centripetal acceleration = 20²/50
Centripetal acceleration = 400/50
Centripetal acceleration = 8m/s²
Therefore, the centripetal acceleration of Zach's car is 8 meters per seconds square.
After a rocket falling through the air explodes, the net momentum of its
fragments...
A. increase
B. Decrease
C. stays the same
D. Is zero
it increase it momentum
When the velocity of an object is quadrupled , by what factor is its kinetic energy changed ?
Answer:
I believe it is 16
Explanation:
Answer:so add the momentum twice and then the kinetic energy becomes four times
Explanation:This includes to me not the factor but by what factor it’s kenetic energy changes Momentum becomes twice and kinetic energy becomes four times its original value
2. What is the smallest particle into which an
element can be divided?
O proton
particle
O atom
O nucleus
Explanation:
atommmmmmmmmmmmmmmmmmmmm
The density of solid copper is 8960 kg/m3.
The density of molten copper is 7900 kg/m3.
Explain this difference in density by referring to the particle model and the arrangement of
atoms in the two states. (2)
Explanation:
The density of a solid copper is 8960kg/m^3 while the density of a molten copper is 7900kg/m^3 this is due to the difference in the state of matter, the solid copper is in solid state while the molten copper is in form of a liquid. In the solid copper atoms are tightly pack while they atom are not tightly packed.
PLEASEEEE HELP MEEEEE!!!! WILL GIVE BRAINLIST!
Which point is located at (4, –2)?
On a coordinate plane, point A is 2 units to the left and 4 units up. Point B is 4 units to the right and 2 units down. Point C is 4 units to the left and 2 units up. Point D is 2 units to the right and 4 units down.
A
B
C
D
Answer:
It is B
Explanation:
Answer:
the other guy is right im answering so you can give him brainliest have a nice day :)
Explanation:
What does the universe contain?
A. Only stars and planets
B. Everything
Answer:
B
In my opinion. :)
Explanation:
Which of the following is a force?
Momentum
Friction
Acceleration
Velocity
Answer:
friction
Explanation:
have you not heard frictional force?
have you ever heard momentum force or acceleration force
hope this helps. if not. please report it and let someone else try it
an object is moving along a straight road at the speed of 6 km per hour
a,how future away is the object every one hour
Answer:
6km
Explanation:
Drag the tiles to the correct boxes to complete the pairs. Not all tiles will be used. Match the reactants with the products.
This is an incomplete question, the complete question is given below.
Drag the tiles to the correct boxes to complete the pairs. Not all tiles will be used. Match the reactants with the products.
copper sulfate + oxygen
copper oxide
zinc sulfate + copper
aluminum chloride + copper
copper + water
copper sulfate + zinc →
aluminum + copper chloride →
copper oxide + hydrogen →
copper + oxygen →
Answer :
Copper sulfate + Zinc → Zinc sulfate + copper
Aluminium + Copper chloride → Aluminium chloride + copper
Copper oxide + Hydrogen → Copper + Water
Copper + Oxygen → Copper oxide
Explanation :
As we know that chemical reaction is a reaction in which two or more than two substances or reactants are reacted to give two or more than two different products.
According to the question:
Copper sulfate + Zinc → Zinc sulfate + copperThis reaction is a single replacement reaction in which zinc is more reactive than copper and zinc displaces copper from its salt to give products.
Aluminium + Copper chloride → Aluminium chloride + CopperThis reaction is a single replacement reaction in which aluminium is a more reactive element than copper and aluminium displaces copper from its salt to give products.
Copper oxide + Hydrogen → Copper + waterThis reaction is a single replacement reaction in which hydrogen displaces less reactive metals from their oxide to form water and the metal.
Copper + Oxygen → Copper oxideThis reaction is a synthesis reaction in which two different atoms or molecules combine to form single compound.
Answer:
Copper sulfate + Zinc → Zinc sulfate + copper
Aluminium + Copper chloride → Aluminium chloride + copper
Copper oxide + Hydrogen → Copper + Water
Copper + Oxygen → Copper oxide
Explanation:
guy above me
The intensity of a sound is another way to say the _________ of a sound.
frequency
amplitude
wavelength
loudness
Answer:
Frequency and tfcvvbyfgffhhi
Answer:
I think frequency
Explanation:
What two things determine whether a molecule is polar?
Check all that apply.
A. If there is an anion and a cation
B. If the molecule is easily ionized
C. If the bonds are polar
D. The molecular shape
Answer:
c
Explanation:
Answer:C&D
Explanation:
I just did it
How are electromagnetic waves different from sound or water waves?
Explanation:
Electromagnetic waves are different from sound or water waves in such a way that water and sound waves are called mechanical waves that requires a material medium for their propagation.
Electromagnetic waves do no require a material medium for propagation.
Electromagnetic waves are carried or transported by radiation and this can be passed through vacuums and different other materials. But mechanical waves such as water and sound waves requires a material medium for their propagation. They cannot pass through a vacuum.mechanical waves apply________to push molecules in their path?
(fill in the blank)
Answer:
what is the force of gravitational attraction between an object with a mass of 100 kg and another object that has a mass of 300 kg are at a distance of 2m apart