Homework Sourse1 Find the surface area and the volume of a sphere whose rad
1. Find the surface area and the volume of a sphere whose radius is 6.4E3 m.
2. Draw a sample time vs force graph when a heavier cart pushes a lighter cart.
3. For how many seconds would a force of 8.00 N have to act on a 2.00 kg mass in order to change its velocity from 2 m/s to 7 m/s.
1. Find the surface area and the volume of a sphere whose radius is 6.4E3 m.
2. Draw a sample time vs force graph when a heavier cart pushes a lighter cart.
3. For how many seconds would a force of 8.00 N have to act on a 2.00 kg mass in order to change its velocity from 2 m/s to 7 m/s.
2. Draw a sample time vs force graph when a heavier cart pushes a lighter cart.
3. For how many seconds would a force of 8.00 N have to act on a 2.00 kg mass in order to change its velocity from 2 m/s to 7 m/s.
Solution
1)R = 6.4 x 10^3 m
A = 4 pi R^2
A = 4 x 3.14 x (6.4 x 10^3)^2 = 5.145 x 10^8 m^2
Hence, A = 5.145 x 10^8 m^2
V = 4/3 pi R^3
V = 4 x 3.14 x (6.4 x 10^3)^3/3 = 1.098 x 10^12 m^3
Hence, V = 1.098 x 10^12 m^3
2)This required more information.
3)We know from the defination of impulse
J = F t ; also
J = m (v2 - v1)
F t = m (v2 - v1)
t = m (v2 - v1)/F = 2 (7 - 2)/8 = 1.25 s
Hence, t = 1.25 s
