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Lady bird [3.3K]
3 years ago
6

I did questions 2 and 3 but I don't know if they are right. Someone help!

Physics
2 answers:
Tems11 [23]3 years ago
8 0

You got it right my friend

Alex73 [517]3 years ago
8 0
Yes they are correct
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Jimmy held the end of a metal bar over a fire while holding on to the opposite end. After a few minutes, the end he was holding
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A. Conduction

Explanation:

Conduction is the transfer of heat within the material itself, and he's holding the metal bar over the fire.

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How far does a runner run if he runs for 60 seconds at 5 m/s
mylen [45]

Answer: 20 miles

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Which statement best explains how a planet affects the orbit of a comet as the comet passes by the planet?
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2 years ago
Hello, why do all electromagnetic waves travel at the same speed in vacuum?
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6 0
3 years ago
At an accident scene on a level road, investigators measure a car's skid mark to be 84 m long. It was a rainy day and the coeffi
Flura [38]

The given data is incomplete. The complete question is as follows.

At an accident scene on a level road, investigators measure a car's skid mark to be 84 m long. It was a rainy day and the coefficient of friction was estimated to be 0.36.  Use these data to determine the speed of the car when the driver slammed on (and locked) the brakes. (why does the car's mass not matter?)

Explanation:

Let us assume that v is the final velocity and u is the initial velocity of the car. Let s be the skid marks and \mu be the friction coefficient and m be the mass of car.

Hence, the given data is as follows.

                v = 0,     s = 84 m,     \mu = 0.36

According to Newton's law of second motion the expression for acceleration is as follows.

                      F = ma

                 -\mu N = ma

                 -\mu mg = ma

                      a = -\mu g

Also,    

               v^{2} = u^{2} + 2as

              (0)^{2} = u^{2} + 2(-\mu g)s

                  u^{2} = 2(\mu g)s

                            = \sqrt{2(0.36)(9.81 m/s^{2})(84 m)}

                            = 24.36 m/s

Thus, we can conclude that the speed of the car when the driver slammed on (and locked) the brakes is 24.36 m/s.

4 0
3 years ago
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