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12345 [234]
3 years ago
8

How could you increase the rolling friction between the car and track? How could you decrease it?

Physics
2 answers:
Radda [10]3 years ago
4 0
Applying brakes
Lubricating axle
ValentinkaMS [17]3 years ago
3 0

Once a wheel is rolling, several factors inhibit its motion.


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A corrosion cell consisting of Zinc and Nickel is formed. Which of the following statement is true? (A) Nickel will act as Anode
Yanka [14]

Answer: B) Zinc will act as Anode

Explanation:

Standard reduction potential of zinc and nickel are:

E^0_{[Zn^{2+}/Zn]}= -0.76V

E^0_{[Ni^{2+}/Ni]}=-0.25V

Here Zinc undergoes oxidation by loss of electrons, thus act as anode as it has more negative reduction potential.

Nickel undergoes reduction by gain of electrons and thus act as cathode. as it has less negative reduction potential.

Zn+Ni^{2+}\rightarrow Zn^{2+}+Ni

E^0_{cell}=E^0_{cathode}- E^0_{anode}

Where both E^0 are standard reduction potentials.

E^0=E^0_{[Ni^{2+}/Ni]}- E^0_{[Zn^{2+}/Zn]}

E^0=0.25-(-0.76V)=0.51V

As the emf is positive, the reaction is spontaneous and reaction will occur.

Thus Zinc will act as anode.

4 0
4 years ago
0.10-kilogram model rocket’s engine is designed to deliver an impulse of 6.0 newton-seconds. If the rocket engine burns for 0.75
UkoKoshka [18]

Answer:

8.0 N

Explanation:

Force: This can be defined as the mass of a body and its acceleration. The S.I unit of Force is Newton (N).

Mathematically, Fore is expressed as

F = ma ........................... equation 1

Where F = force, m = mass, a = acceleration.

and

I = mΔv

Δv = I/m ............................ Equation 2

Where I = impulse, m = mass, Δv = change in velocity

Given: I = 6.0 Newton-seconds, m = 0.1 kilogram.

Substituting into equation 2

Δv = 6.0/0.1

Δv = 60 m/s.

But

a = Δv/t

where t = time = 0.75 seconds.

a = 60/0.75

a = 80 m/s²

Substitute the values of a and m into equation 1.

F = 0.1(80)

F = 8.0 N.

Thus the average force produced = 8.0 N

6 0
3 years ago
A company designed and sells an ultrasonic​ receiver, which detects sounds unable to be heard by the human ear. The receiver can
Kruka [31]

Answer:

the diameter of the outside edge of the receiver is 8\sqrt{18} \ \ \ inches

Explanation:

From the schematic free body diagram illustrating what the question is all about below;

Let represent A to be the vertex where the receiver is being placed

S to be the focus

BP to be equal to r (i.e radius of the outer edge)

BC to be 2 r   (i.e the diameter)

Given that AS = 4 in and AP is 18 in

Let AP be x- axis and AY be y -axis

A=(0,0)

S=(4,0) = (0,0)

So that the equation of the parabolic path of the receiver will be:

y^2 =4 ax  \\ \\ y^2 = 4*4*x \\ \\ y^2 = 16x

B = (AP, BP)

B = (18, r)

B lies  y² = 16 x

r² = 16 x

r² 16 × 18

r = \sqrt{16*18 } \\ \\ r = 4\sqrt{18}

Diameter BC = 2r

2* 4\sqrt{18} \\ \\= 8\sqrt{18 }  \ \ \ inches

6 0
4 years ago
Butter is an example for<br>liquid in solid or solid in liquid ​
ioda

Answer:

Liquid in solid.

Explanation:

Butter is colloidal in nature belonging to the category of gels. This means that the dispersed phase is liquid and the dispersing medium is solid. In short, butter is an example for liquid in solid.

8 0
3 years ago
You accidentally drop a book down a stairwell. Assuming no air resistance, How fast will the book be moving after 1.1 second?
nlexa [21]
It would be accelerating at -9.8 m/s^2 so it’s velocity would be equal to -9.8•1.1 so the answer is 10.78m/s
3 0
3 years ago
Read 2 more answers
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