A strong wind exerts a horizontal force of 2000N on a flat 1500kg roof. Calculate the acceleration of the...

1. A strong wind exerts a horizontal force of 2000N on a flat 1500kg roof. Calculate the acceleration of the roof.
2. Which of the following is most likely to be used as a lightning conductor?
A. Copper
B. Iron
C. Aluminium
D. Steel
3. The table below compares the electrical resistivity of some materials.
Material: Glass, Steel, Aluminium, Iron
Resistivity (Ωm): 10^10, 10^-7, 10^-8, 10^-7
Which material is the best conductor of electricity?
4. The graph below shows the relationship between stress and strain for some materials as shown below.
Stress (N/m^2): 0, 2, 4, 6, 8, 10
Strain: 0, 0.2, 0.4, 0.6, 0.8, 1.0
Which material has the highest Young modulus?
5. The table below shows the relationship between two quantities X and Y.
X/Y: 1/X, X/L, 5X, L/S, L/S
Y/X: D/P/S, P/S, S/X, L/S, L/S
The two forces, F and X, are acting on a solid material to produce a force F. What is the ratio of the diameter of the material X to the length L of the material?
6. A material has a density of 1000 kg/m^3 and a volume of 0.5m^3. Calculate its mass.
7. Which of the following is a solid material that has the highest ability to withstand deformation referred to as its Young modulus?
A. 0.63
B. 1.63
C. 2.27
D. 3.27