Question 4 is using records of flood patterns to predict future flooding
Question 5 is Hutton and Lyell
Answer:
6 m/s²
Explanation:
We are given;
- The mass of the block as 6.2 kg
- Horizontal force as 50.9 N
- Frictional force as 13.7 N
We are required to determine the acceleration of the block.
- According to second Newton's Law of motion; Resultant force is directly proportional to the rate of change in linear momentum.
Therefore;
F = Ma , where F is the resultant force, m is the mass and a is the acceleration.
In this case;
Resultant force, F = Horizontal force - friction force
= 50.9 N - 13.7 N
= 37.2 N
Thus;
37.2 N = 6.2 kg × a
Hence;
acceleration, a = 37.2 N ÷ 6.2 kg
= 6 m/s²
Therefore, the acceleration of the block is 6 m/s²
Answer:
0.5kg
Explanation:
Given parameters:
Potential energy = 147J
Height = 30m
Unknown:
Mass of the bird = ?
Solution:
Potential energy is the energy due to the position of a body. Now, the expression for finding the potential energy is given as;
P.E = mgH
m is the mass
g is the acceleration due to gravity = 9.8m/s²
H is the height
147 = m x 9.8 x 30
m = 0.5kg
Nah cause it would sink m8 so no its false