Answer:
(a) The horizontal ground reaction force
(b) The vertical ground reaction force
(c) The resultant ground reaction force
Explanation:
Given
John mass , m = 65 kg
Horizontal acceleration ,
Vertical acceleration ,
(a) Using Newton's 2nd law in horizontal direction
=>
Thus the horizontal ground reaction force
(b) Using Newton's 2nd law in vertical direction
=>
=>
Thus the vertical ground reaction force
(c) Resultant ground reaction force is
=>
=>
Thus the resultant ground reaction force
Answer:
Explanation:
Given
No of logs
diameter of log
Length of log
42 % of log volume(V) is above water when no one is on raft
so 58 % of log volume(V) is submerged in the water
Weight of 14 log
Buoyancy force on 14 logs
as system is in equilibrium so
Specific gravity of log
You can tell if vector is an unit because it has something to do with taking the magnitude of the vector.
also has a length 1. thus you should use pythagoras to check.
Hope this help
Answer:
0.00264C
Explanation:
Using the Columbs law formula
F = kq1q2/r²
F is the force of attraction
q1 and q2 are the charges
r is the distance between the charges.
k is the Coulomb's cinsrsnty
Given F = 19N, q1 = -0.0005C
r = 25m q2 = ?
Substituting
19 = 9×10^9×-0.0005q2/25²
11875 = -4,500,000q2
q2 = 11,875/-4,500,000
q2 = - 0.0264C
Magnitude of the second charge is 0.00264C