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Paraphin [41]
3 years ago
9

When a gun is fired how come yhe recoil is not strong enough to knock the shooter over?

Physics
1 answer:
ASHA 777 [7]3 years ago
8 0
Because inside the gun it has dynamite
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A pulley system with a mechanical advantage of 15 is used to lift a 1750 N piano to a third floor balcony that is 7 m above the
devlian [24]

Answer:

The  force is E = 117 \  N

Explanation:

From the question we are told that

     The  mechanical advantage is  ME =  15

     The load is L  =  1750 \  N

      The  height is  h  =  7  \  m

Generally mechanical advantage is mathematically represented as

       ME =  \frac{L }{E }

Here E is the force that must be applied to move the piano

=>     E =  \frac{L}{ ME }

=>     E =  \frac{1750 }{15  }

=>     E = 117 \  N

6 0
2 years ago
A fox is 7 meters from the base of a tree that is 15 m tall. A nest of owls is at the top of the tree. One of the owlets tosses
mamaluj [8]
Refer to the diagram shown below.

In this analysis, wind resistance is ignored, and g = 9.8 m/s².

The meat falls with zero vertical velocity, therefore the time, t, before the meat hits the ground is
\frac{1}{2}*(9.8 \, \frac{m}{s^{2}})*(t \, s)^{2} = (15 \, m) \\ t= \sqrt{ \frac{15}{4.9} }= 1.75 \, s

If the fox catches the meat before it hits the ground, then the fox should travel a horizontal distance d in the same time that the meat travels a horizontal distance (7 -d).
The meat travels a distance of 
7 - d = (1.2 m/s)*(1.75 s) = 2.1 m
or
d = 4.9 m

Let v =  velocity of the fox when it catches the meat.
If the acceleration of the fox is a m/s², then
v = 1.75a
Also,
d= \frac{1}{2} *(a \,  \frac{m}{s^{2}} )*(1.75 \, s)^{2} =  \frac{1}{2}( \frac{v}{1.75})^{2}*(1.75^{2})  \\ 4.9 = 0.875v^{2} \\ v^{2} = 5.6 \\ v = 2.366 \, m/s

Answer:  2.37 m/s  (nearest hundredth)



5 0
3 years ago
Why is a biome an open system?
Rasek [7]
Biome is an open system because energy and matter are constantly being transferred in and out.
 

i hope this helped you..

:)

5 0
3 years ago
If a black hole itself emits no radiation, what evidence do astronomers and physicists today have that the theory of black holes
AleksandrR [38]

Answer:

Einstein's general theory of relativity is the theory behind black holes has been tested with a wide range of experiments of which all confirm the predictions the theory makes. We cannot see black holes phenomena inside the event horizon, we do observe things outside this limit.

Black holes in binary star systems leave signs of their presence on neighboring star thats detected and the signs include X-ray emissions, accretion disks, and large orbit perturbations.

this is the evidence that astronomers and physicists have to show that the theory about black holes is correct.

6 0
3 years ago
The speed of sound waves
neonofarm [45]
B. Is faster in solids than liquids would be the correct answer because the molecules in solids are much closer and can pass along energy faster and more effectively.
4 0
2 years ago
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