C the correct but not sure?
by momentum conservation we can say
since gun and bullet was initially at rest so initial momentum of both must be ZERO
<em>so it will recoil back with speed 9 m/s</em>
Answer:
F = 51 10² N and The force applied is 11.6 times greater than the weight
Explanation:
As we are asked the force we can use Newton's second law and we calculate the acceleration by kinematics
y = v₀ t + ½ a t²
On the ground its initial velocity is zero (v₀ = 0)
y = ½ a t²
a = 2y / t²
a = 2 2.5 / 0.21²
a = 113.38 m / s²
We calculate the force
F = ma
F = 45 113.38
F = 5102 N
F = 51 10² N
For the relationship of this force with the weight, divide the two
F / W = 51 10²/45 9.8
F / W = 11.6
The force applied is 11.6 times greater than the weight
The main cause of weather is uneven heating of the earth's surface.
There are various factors that contribute to weather, however the main factor is the uneven heating of the earths surface. This creates temperature differences and can cause water to evaporate and condense. This, combined with earth's spin lead to large scale weather systems and wind currents. These in turn are influenced by land forms, bodies of water, and even vegetation.
The resultant force on the object is
∑ <em>F</em> = 〈0, 8〉 N + 〈6, 0〉 N = 〈6, 8〉 N
which has a magnitude of
<em>F</em> = √((6 N)² + (8 N)²) = √(100 N²) = 10 N
By Newton's second law, the acceleration has magnitude <em>a</em> such that
<em>F</em> = <em>m a</em>
10 N = (2 kg) <em>a</em>
<em>a</em> = (10 N) / (2 kg)
<em>a</em> = 5 m/s²
so the answer is B.