mass/volume
30/3x4x5
10/4x5
2/4
.5g/cm3
Answer: 3.906kg
Explanation:
K.E = 2000J
V = 32m/s
m =?
K.E = 1/2MV2
2000 = 1/2M x (32^2)
2000 = 1/2M x 1024
2000 = 512M
M = 2000/512
M = 3.906kg
Answer:
A
From a Solenoid we know that a magnetic fiel is always inversely proportional to lenght L or BL = constant
As I is constant