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Serhud [2]
3 years ago
11

I have a question regarding friction in rolling without slipping.

Physics
1 answer:
Solnce55 [7]3 years ago
4 0

Explanation:

They probably put "rolls without slipping" in there to indicate that there is no loss in friction; or that the friction is constant throughout the movement of the disk. So it's more of a contingency part of the explanation of the problem.

(Remember how earlier on in Physics lessons, we see "ignore friction" written into problems; it just removes the "What about [ ]?" question for anyone who might ask.)

In this case, you can't ignore friction because the disk wouldn't roll without it.

As far as friction producing a torque... I would say that friction is a result of the torque in this case. And because the point of contact is, presumably, the ground, the friction is tangential to the disk. Meaning the friction is linear and has no angular component.

(You could probably argue that by Newton's 3rd Law there should be some opposing torque, but I think that's outside of the scope of this problem.)

Hopefully this helps clear up the misunderstanding for you.

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Two bodies, A and B, have equal kinetic energies. The mass of A is nine times that of B. The ratio of the momentum of A to that
mylen [45]

Answer:

D. 3 : 1

Explanation:

Let suppose that A and B are particles. From statement we know that K_{A} = K_{B } (same kinetic energy) and m_{A} = 9\cdot m_{B}. Then,

K_{A} = K_{B}

\frac{1}{2}\cdot m_{A}\cdot v_{A}^{2} = \frac{1}{2}\cdot m_{B}\cdot v_{B}^{2}

m_{A} \cdot v_{A}^{2} = m_{B}\cdot v_{B}^{2}

\frac{v_{B}}{v_{A}} = \sqrt{\frac{m_{A}}{m_{B}} }

\frac{v_{B}}{v_{A}} = 3

And the ratio of the momentum of A to the momentum of B is:

r = \frac{m_{A}\cdot v_{A}}{m_{B}\cdot v_{B}}

r = 9\times \frac{1}{3}

r = 3

Hence, the correct answer is D.

4 0
3 years ago
A car is traveling in a race.The car went from the initial velocity of 35 to the final velocity of 65 in 5 seconds what is the a
Ann [662]

Answer:

Acceleration = 6m/s²

Explanation:

<u>Given the following data;</u>

Initial velocity = 35m/s

Final velocity = 65m/s

Time = 5 seconds

To find the acceleration;

In physics, acceleration can be defined as the rate of change of the velocity of an object with respect to time.

This simply means that, acceleration is given by the subtraction of initial velocity from the final velocity all over time.

Mathematically, acceleration is given by the equation;

Acceleration (a) = \frac{final \; velocity  -  initial \; velocity}{time}

Where,

  • a is acceleration measured in ms^{-2}
  • v and u is final and initial velocity respectively, measured in ms^{-1}
  • t is time measured in seconds.

Substituting into the equation, we have

a = \frac{65 - 35}{5}

a = \frac{30}{5}

<em>Acceleration = 6m/s²</em>

7 0
3 years ago
The current and the potential difference in an inductor are in phase. B. The current lags the potential difference by π/2 in an
slava [35]

Answer:

The current lags the potential difference by π/2 in an inductor

Explanation:

The potential difference leads to the current by  \frac{\pi}{2}. Alternate signals such as current and voltage -in this case- are periodic, this means that this signals are repeated at fixed spaces of time. Thus, In an inductor the current lags the potential difference by \frac{\pi}{2}.

6 0
3 years ago
A 2.00 kg block hangs from a spring. A 300 g body hung below the block stretches the spring 2.00 cm farther. (a) What is the spr
Leokris [45]

The spring constant is 147 N/m

Given the mass of the block is 2.00 kg , the mass of the body is 300 g and the length of the spring is 2.00 cm

We need to find the spring constant

A spring is an object that can be deformed by a force and then return to its original shape after the force is removed.

The force required to stretch an elastic object such as a metal spring is directly proportional to the extension of the spring

We know that F = kx

300(9.8)= k (0.02)

k = 147.15 N/m

Rounding off to the nearest is 147N/m

The spring constant is 147N/m

Learn more about Hooke's law here

brainly.com/question/15365772

#SPJ4

7 0
2 years ago
How do u get rid of a hacker? plz help my friend needs this
Alja [10]
IP address then call the cops
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3 years ago
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