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DiKsa [7]
3 years ago
5

If a sled is being pulling on the ground toward the right with a force of 100 N and friction is acting on it to the left with a

force of 85 N, what is the net force
of the sled?
O 15 N to the left
15 N to the right
185 N to the right
185 N to the left
Physics
1 answer:
Korolek [52]3 years ago
5 0

Answer:

15 N to the right.

Explanation:

100 N to the right -->

85 N to the left <--

So therefore in order to find the net force of where the sled is being dragged towards is 100 N - 85 N = 15 N.

So the sled is moving towards the right of 15 N.

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A ruby laser delivers a 16.0-ns pulse of 4.20-MW average power. If the photons have a wavelength of 694.3 nm, how many are conta
stepan [7]

Answer:

The  value is  n  =  2.347 *10^{17} \  photons

Explanation:

From the question we are told that

     The  amount of power delivered is  P  =  4.20 \  M W  =  4.20  *10^{6} \  W

      The  time taken is  t =  16.0ns  =  16.0 *10^{-9} \  s

       The  wavelength is  \lambda  =  694.3 \  nm =  694.3 *10^{-9} \  m

     

Generally the energy delivered is  mathematically represented as

     E  =  P  * t  =  \frac{n  *  h  *  c  }{\lambda }

Where  h is the Planck's constant with value  h  =  6.262  *10^{-34} \  J \cdot  s

           c  is the speed of light with value  c =  3.0*10^{8} \  m/s

     

So  

    4.20 *10^{6}  *  16*10^{-9}=  \frac{n  *  6.626 *10^{-34}  *  3.0*10^{8}  }{694.3 *10^{-9}}

=>    n  =  2.347 *10^{17} \  photons

4 0
3 years ago
Which of the following is an example of an anaerobic exercise?
Nataly [62]
Sitting. Because its no move at all
7 0
4 years ago
The siren on an ambulance is emitting a sound whose frequency is2550 Hz. The speed of sound is 343 m/s.(a) If the ambulance is s
Sati [7]

Answer:

0.13451 m

0.124196 m

0.119997901132 m

Explanation:

v_o = Velocity of the observer

v_s = Velocity of sound source

v = Velocity of sound in air = 343 m/s

Wavelength is given by

\lambda=\dfrac{v}{f}\\\Rightarrow \lambda=\dfrac{343}{2550}\\\Rightarrow \lambda=0.13451\ m

The wavelength is 0.13451 m

From Doppler effect we have the formula

f=f'\dfrac{v}{v-v_s}\\\Rightarrow f=2550\dfrac{343}{343-26.3}\\\Rightarrow f=2761.7619198\ Hz

\lambda=\dfrac{343}{2761.7619198}\\\Rightarrow \lambda=0.124196\ m

The wavelength is 0.124196 m

f=f'\dfrac{v+v_o}{v-v_s}\\\Rightarrow f=2550\dfrac{343+12}{343-26.3}\\\Rightarrow f=2858.38332807\ Hz

\lambda=\dfrac{343}{2858.38332807}\\\Rightarrow \lambda=0.119997901132\ m

The wavelength is 0.119997901132 m

8 0
4 years ago
The ______ length of a lens is the distance from the center of the lens to<br> its principal focus.
Marizza181 [45]

Answer:

<h2>Focal length</h2>

Explanation:

The Focal length of a lens is the distance from the center of the lens to

its principal focus.

3 0
3 years ago
This chart shows the volumes of four different objects. If the objects all have the same mass, which object is the most dense? O
svet-max [94.6K]

Object 3 on e2020. Hope this helps

3 0
3 years ago
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