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Ber [7]
4 years ago
14

A bike is traveling to the left with the speed of 27 m/s when the rider slams on the brakes. The bike skids for 41.5 m with the

constant acceleration before it comes to a stop.
What was the acceleration of the bike as it cane to a stop?
Physics
2 answers:
Darina [25.2K]4 years ago
5 0

The acceleration of the bike is equal to 8.78\frac{m}{s^{2}} opposing the movement (to the right).

Why?

Since after the rider slams the brakes, the bike came to a stop, we know that the acceleration is opposite to the velocity/movement.

We can use the following equation to calculate the acceleration:

v_{f}^{2}=v_{o}^{2}+2*a*d

So, substituting, we have: (let's consider negative to the left and positive to the right)

0=(-27\frac{m}{s} )^{2}+2*a*41.5m\\\\0=729\frac{m^{2} }{s^{2} }+83*a\\\\a=\frac{-729\frac{m^{2}}{s^{2}}}{83m}=-8.78\frac{m}{s^{2}}

The negative sign means that the acceleration's direction is opposite to the movement.

Hence, we have that the acceleration is equal to 8.78\frac{m}{s^{2}} opposing the movement (to the right).

Have a nice day!

Ghella [55]4 years ago
4 0

Answer: 8.78

Explanation:

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3 years ago
The noble gases have eight valence electrons and as a result are
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The noble gases have eight valence electrons and as a result are stable. 

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4 years ago
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3 years ago
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An 8 g bullet leaves the muzzle of a rifle with
Elena-2011 [213]

Answer: 1872 N

Explanation:

This problem can be solved by using one of the Kinematics equations and Newton's second law of motion:

V^{2}=V_{o}^{2} + 2ad (1)

F=ma (2)

Where:

V=611.9 m/s is the bullet's final speed (when it leaves the muzzle)

V_{o}=0 is the bullet's initial speed (at rest)

a is the bullet's acceleration

d=0.8 m is the distance traveled by the bullet before leaving the muzzle

F is the force

m=8 g \frac{1 kg}{1000 g}=0.008 kg is the mass of the bullet

Knowing this, let's begin by isolating a from (1):

a=\frac{V^{2}}{2d} (3)

a=\frac{(611.9 m/s)^{2}}{2(0.8 m)} (4)

a=234013.5063 m/s^{2} \approx 2.34(10)^{5} m/s^{2} (5)

Substituting (5) in (2):

F=(0.008 kg)(2.34(10)^{5} m/s^{2}) (6)

Finally:

F=1872 N

4 0
3 years ago
What impact has the use of optical fibre cables had on the way we receive and communicate information? Discuss both positive AND
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Due to rising demand for higher bandwidth and faster speed connections, fiber optic transmission is becoming more and more common in the developing world. Optical fiber has had a great impact on the way we receive and transmit signals. They have largely replaced copper wire communications in core networks in the developed world, because of its advantages over electrical transmission. But they brought some difficulties as well.

Following are the advantages and disadvantages of optical fiber:

Advantages

  • They provide extremely High Bandwidth.
  • Optical fiber is capable of low power loss at long distances.
  • Optical fiber is highly resistant to electromagnetic disturbances. They are virtually error free.
  • The data is transferred through light that is why there is no security risk of data being detected.
  • Optical fiber has lesser weight and size as compared to other cables.

Disadvantages

  • They are made of glass that is why they are very fragile and they have to be handled carefully.
  • They are difficult to install. If you bend them too much, they will break. And fiber cable is highly susceptible to damage during installation or construction activities.
  • Extra optical components have to be added to handle dispersion of light at longer distances.
  • Optical fiber costs a lot more than copper cables. The installation itself is very costly.

Keywords: fiber optics, bandwidth, transmission, impact, advantages, disadvantages

Learn more about Fiber Optics from brainly.com/question/1373678

#learnwithBrainly

5 0
4 years ago
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