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Arturiano [62]
3 years ago
12

A sled is pushed along an ice covered lake. It has some initial velocity before coming to rest in 15m. It took 23 seconds before

the sled and rider came to a rest. If the rider and sled have a combined mass of 52.5 kg, what is the magnitude and direction of the stopping force? What do we call the stopping force?

Physics
1 answer:
ZanzabumX [31]3 years ago
7 0
Since no external force is acting except frictional force, so stopping force is frictional force with magnitude ~ 3N in the direction opposite to the motion of sledge.

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The state highway patrol radar guns use a frequency of 8.66 GHz. If you're approaching a speed trap driving 35.0 m/s, what frequ
otez555 [7]

Answer:

The frequency shift detected is \Delta  f  =1010.3 Hz

Explanation:

From the question we are told that

    The normal frequency of the state highway patrol radar guns f = 8.66 GHz =   8.66 *10^{9} \ Hz

     The speed of approach is v  =  35 .0 \ m/s

       

Now the frequency measure by the the state highway patrol radar guns as your car approaches is mathematically represented as

        f_n  =  f (1 + \frac{v}{c} )

Where c is the speed of light which a has constant value of

     c =  3.0 *10^{8 } \ m/s

  Now

       f_n - f  =  \frac{fv}{c} )

=>    \Delta  f  =   \frac{fv}{c}

substituting values

        \Delta  f  = \frac{ 8.66 *10^{9} *  35}{3.0 *10^8 }

        \Delta  f  =1010.3 Hz

 

3 0
4 years ago
The point beneath the surface where rock breaks and an earthquake is produced is known as the ______.
posledela
B. Focus is the answer.
8 0
4 years ago
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in a billiards game, the white cue ball hits the black ball, moving the black ball to the right while the cue ball moves to the
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Answer:

The black ball moving to the right after being struck by the white ball

Explanation:

4 0
3 years ago
During a race, a runner runs at a speed of 6 m/s. 2 seconds later, she is running at a speed of 10 m/s. What is the runner’s acc
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V o = 6 m/s,
t = 2 s
v = 10 m/s
v = v o + a t
a t = v - v o
a = ( v - v o ) / t 
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Answer:
The runner`s acceleration is 2 m/s².
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3 years ago
Would this be Newtons 1st, 2nd, or 3rd law​
nekit [7.7K]

Answer:

Newton's First Law of Motion.

Explanation:

Newton's First Law of Motion states that a body continues its state of motion untill and unless an external force acts on it. Here, the truck moves forward even after the breaks are applied in order to maintain its State of motion.

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3 years ago
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