Explanation:
The options are; Ice Steam and Water.
The state of matter associated with the options are;
Ice - Solid
Steam - Gas
Water- Liquid
The particles are arranged in a regular pattern in ____________________
Among all the state of matter, the particles are closely packed and in an ordered manner is observed in the solid state - Ice
The particles are close together but not in a pattern in ____________________
In the liquid state of matter, the particles are not as tightly bounded as that of the solid. Hence they are able to still move around a bit. - Water
The particles move quickly in all directions in ____________________
The particles of the gaseous state move in all directions colliding with each other and the walls of the container. - Steam
Its main function is to carry information of amino acid sequences from genes to the ribosomes (where proteins are then made) in the cytoplasm.
Think of RNA as a blueprint for DNA. I hope this helped!!
Answer:
a) Ffr = -0.18 N
b) a= -1.64 m/s2
c) t = 9.2 s
d) x = 68.7 m.
e) W= -12.4 J
f) Pavg = -1.35 W
g) Pinst = -0.72 W
Explanation:
a)
- While the puck slides across ice, the only force acting in the horizontal direction, is the force of kinetic friction.
- This force is the horizontal component of the contact force, and opposes to the relative movement between the puck and the ice surface, causing it to slow down until it finally comes to a complete stop.
- So, this force can be written as follows, indicating with the (-) that opposes to the movement of the object.
![F_{frk} = -\mu_{k} * F_{n} (1)](https://tex.z-dn.net/?f=F_%7Bfrk%7D%20%3D%20-%5Cmu_%7Bk%7D%20%2A%20F_%7Bn%7D%20%281%29)
where μk is the kinetic friction coefficient, and Fn is the normal force.
- Since the puck is not accelerated in the vertical direction, and there are only two forces acting on it vertically (the normal force Fn, upward, and the weight Fg, downward), we conclude that both must be equal and opposite each other:
![F_{n} = F_{g} = m*g (2)](https://tex.z-dn.net/?f=F_%7Bn%7D%20%3D%20F_%7Bg%7D%20%3D%20m%2Ag%20%282%29)
- We can replace (2) in (1), and substituting μk by its value, to find the value of the kinetic friction force, as follows:
![F_{frk} = -\mu_{k} * F_{n} = -0.167*9.8m/s2*0.11kg = -0.18 N (3)](https://tex.z-dn.net/?f=F_%7Bfrk%7D%20%3D%20-%5Cmu_%7Bk%7D%20%2A%20F_%7Bn%7D%20%3D%20-0.167%2A9.8m%2Fs2%2A0.11kg%20%3D%20-0.18%20N%20%283%29)
b)
- According Newton's 2nd Law, the net force acting on the object is equal to its mass times the acceleration.
- In this case, this net force is the friction force which we have already found in a).
- Since mass is an scalar, the acceleration must have the same direction as the force, i.e., points to the left.
- We can write the expression for a as follows:
![a= \frac{F_{frk}}{m} = \frac{-0.18N}{0.11kg} = -1.64 m/s2 (4)](https://tex.z-dn.net/?f=a%3D%20%5Cfrac%7BF_%7Bfrk%7D%7D%7Bm%7D%20%3D%20%5Cfrac%7B-0.18N%7D%7B0.11kg%7D%20%3D%20-1.64%20m%2Fs2%20%20%284%29)
c)
- Applying the definition of acceleration, choosing t₀ =0, and that the puck comes to rest, so vf=0, we can write the following equation:
![a = \frac{-v_{o} }{t} (5)](https://tex.z-dn.net/?f=a%20%3D%20%5Cfrac%7B-v_%7Bo%7D%20%7D%7Bt%7D%20%285%29)
- Replacing by the values of v₀ = 15 m/s, and a = -1.64 m/s2, we can solve for t, as follows:
![t =\frac{-15m/s}{-1.64m/s2} = 9.2 s (6)](https://tex.z-dn.net/?f=t%20%3D%5Cfrac%7B-15m%2Fs%7D%7B-1.64m%2Fs2%7D%20%3D%209.2%20s%20%286%29)
d)
- From (1), (2), and (3) we can conclude that the friction force is constant, which it means that the acceleration is constant too.
- So, we can use the following kinematic equation in order to find the displacement before coming to rest:
![v_{f} ^{2} - v_{o} ^{2} = 2*a*\Delta x (7)](https://tex.z-dn.net/?f=v_%7Bf%7D%20%5E%7B2%7D%20-%20v_%7Bo%7D%20%5E%7B2%7D%20%3D%202%2Aa%2A%5CDelta%20x%20%20%287%29)
- Since the puck comes to a stop, vf =0.
- Replacing in (7) the values of v₀ = 15 m/s, and a= -1.64 m/s2, we can solve for the displacement Δx, as follows:
![\Delta x = \frac{-v_{o}^{2}}{2*a} =\frac{-(15.0m/s)^{2}}{2*(-1.64m/s2} = 68.7 m (8)](https://tex.z-dn.net/?f=%5CDelta%20x%20%20%3D%20%5Cfrac%7B-v_%7Bo%7D%5E%7B2%7D%7D%7B2%2Aa%7D%20%3D%5Cfrac%7B-%2815.0m%2Fs%29%5E%7B2%7D%7D%7B2%2A%28-1.64m%2Fs2%7D%20%3D%2068.7%20m%20%20%288%29)
e)
- The total work done by the friction force on the object , can be obtained in several ways.
- One of them is just applying the work-energy theorem, that says that the net work done on the object is equal to the change in the kinetic energy of the same object.
- Since the final kinetic energy is zero (the object stops), the total work done by friction (which is the only force that does work, because the weight and the normal force are perpendicular to the displacement) can be written as follows:
![W_{frk} = \Delta K = K_{f} -K_{o} = 0 -\frac{1}{2}*m*v_{o}^{2} =-0.5*0.11*(15.0m/s)^{2} = -12.4 J (9)](https://tex.z-dn.net/?f=W_%7Bfrk%7D%20%3D%20%5CDelta%20K%20%3D%20K_%7Bf%7D%20-K_%7Bo%7D%20%3D%200%20-%5Cfrac%7B1%7D%7B2%7D%2Am%2Av_%7Bo%7D%5E%7B2%7D%20%3D-0.5%2A0.11%2A%2815.0m%2Fs%29%5E%7B2%7D%20%20%20%3D%20-12.4%20J%20%20%289%29)
f)
- By definition, the average power is the rate of change of the energy delivered to an object (in J) with respect to time.
![P_{Avg} = \frac{\Delta E}{\Delta t} (10)](https://tex.z-dn.net/?f=P_%7BAvg%7D%20%3D%20%5Cfrac%7B%5CDelta%20E%7D%7B%5CDelta%20t%7D%20%20%2810%29)
- If we choose t₀=0, replacing (9) as ΔE, and (6) as Δt, and we can write the following equation:
![P_{Avg} = \frac{\Delta E}{\Delta t} = \frac{-12.4J}{9.2s} = -1.35 W (11)](https://tex.z-dn.net/?f=P_%7BAvg%7D%20%3D%20%5Cfrac%7B%5CDelta%20E%7D%7B%5CDelta%20t%7D%20%3D%20%5Cfrac%7B-12.4J%7D%7B9.2s%7D%20%3D%20-1.35%20W%20%2811%29)
g)
- The instantaneous power can be deducted from (10) as W= F*Δx, so we can write P= F*(Δx/Δt) = F*v (dot product)
- Since F is constant, the instantaneous power when v=4.0 m/s, can be written as follows:
![P_{inst} =- 0.18 N * 4.0m/s = -0.72 W (12)](https://tex.z-dn.net/?f=P_%7Binst%7D%20%3D-%200.18%20N%20%2A%204.0m%2Fs%20%3D%20-0.72%20W%20%2812%29)
Explanation:
The two postulates of special theory of relativity
Postulate 1: The law of physics are invariant under any of inertial frame of reference.
Postulate 2: The velocity of light is remains same in each ans every frame of reference and independent of relativity.
They are differ from classical mechanics that in classical mechanics there is no change in mass and length in relative velocity but in relativistic mechanics it changes.
These two postulates implements in phenomenon like time dilation , length contraction etc.
Thanks