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astra-53 [7]
2 years ago
13

A 500.0-kilogram cannon is at rest on a frictionless surface. A remote triggering device causes a 5.0-kilogram projectile to be

fired from the cannon moving at 30 m/s. What is the recoil speed of the cannon?
A. 83.3 m/s
B. 0.3 m/s
C. 16.7 m/s
D. 75 m/s
Physics
1 answer:
KiRa [710]2 years ago
3 0
From the law of conservation of momentum the initial momentum is equivalent to the final momentum. Therefore, the total momentum before firing will be equivalent to the momentum after firing. if we take mass of the projectile to be mass i and that of the cannon as mass ii.
The initial momentum will be given by m1v1 +m2v1 
This initial momentum is equivalent to zero since initially both the cannon and the projectile are at zero velocity.
The final momentum is given by m1v2 + m2v3, where v2 is the velocity of the projectile  and v3 is the recoil velocity of the cannon.
Therefore, m1v2 + m2v3 =0
              ( 5 × 30 ) + ( 500 × v3) =0
               500 v3 = -150
                       v3 =  - 0.3 m/s
The velocity is negative indicating that the cannon moved in the opposite direction. therefore, the recoil velocity is 0.3 m/s
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In-s [12.5K]

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A Physicist in the canoe, or on a raft floating downriver next to the canoe, will say that the canoe's kinetic energy is zero.

A Physicist on the riverbank, watching the canoe drift by at 1 m/s, will say that its kinetic energy is 9 Joules.

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8 0
3 years ago
On Earth, 1 kg = 9.8 N = 2.2 lbs. On the Moon, 1 kg = 1.6 N = 0.37 lbs. Use these relationships to answer the following question
romanna [79]

Answer:

(a) 490 N on earth

(b) 80 N on earth

(c) 45.4545 kg on earth

(d) 270.27 kg on moon

Explanation:

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And 1 kg = 1.6 N = 0.37 lbs on moon

(a) We have given mass of the person m = 50 kg

As it is given that 1 kg = 9.8 N

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As it is given that on moon 1 kg = 1.6 N

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As it is given that 1 kg = 2.2 lbs on earth

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8 0
3 years ago
If a substance has a density of 2.7g/cm3 and a mass of 86.4g, what is its volume?
Gennadij [26K]

Answer:

32cm³

Explanation:

Given parameters:

  Density of substance  = 2.7g/cm³

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Unknown:

Volume of substance  = ?

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Since the unknown is volume we solve for it;

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    volume  = \frac{86.4}{2.7}   = 32cm³

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lys-0071 [83]
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If the mass is 167, and 48 of those are protons, then there are

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