Answer:
15.29m/s
Explanation:
Using the law of conservation of momentum
m1u1+m2u2 = (m1+m2)v
m1 is the mass of the clown = 85kg
u1 is the velocity of the clown = 0m/s (fired out from rest)
m2 is the mass of the cannon = 480kg
u2 is the velocity of the cannon = 18m/s
Let v me the recoil speed of the cannon
Substitute into the formula
85(0)+480(18) = (85+480)v
0+8640 = 565v
v = 8640/565
v = 15.29m/s
Hence the recoil speed of the cannon is 15.29m/s
B)comet nuclei are not uniform in composition
Answer: Option (c) is the correct answer.
Explanation:
According to the second law of motion mass of an object times its acceleration is equal to the net force on the object.
Mathematically, F = ma
Generally, mass is expressed in kilograms (kg) and acceleration is expressed as follows.
acceleration = ![\frac{velocity}{time}](https://tex.z-dn.net/?f=%5Cfrac%7Bvelocity%7D%7Btime%7D)
= ![\frac{m/s}{s}](https://tex.z-dn.net/?f=%5Cfrac%7Bm%2Fs%7D%7Bs%7D)
= ![ms^{-2}](https://tex.z-dn.net/?f=ms%5E%7B-2%7D)
Hence, S.I unit of acceleration is
.
Therefore, units of force will be as follows.
F = ma
= ![kg \times ms^{-2}](https://tex.z-dn.net/?f=kg%20%5Ctimes%20ms%5E%7B-2%7D)
Thus, we can conclude that
gives the correct units for force.
There are eight planets in the milky way galaxy
V=IR, V=30, I=2, algebra and tada, R=15