Answer:
Explanation:
Magnetic Force on the rod F = Bi L
Work done by this force = F X d
= Bi Ld
This energy is converted into both rotational and linear kinetic energy
= 1/2 I ω² + 1/2 mv²
= 1/2 x 1/2 m r²ω²+ 1/2 mv²
= 1/4 m v² + 1/2 mv²
= 3/4 mv²
So according to conservation of energy
Bi Ld = 3/4 mv²
v = 
B
add them all by direction
13 East
10 West
subtract difference
3 E
Answer:
D
Explanation:
The friction force is the weight force times the coefficient of friction. So diving by the coefficient gives you the weight force which is equivalent to the normal force.
Answer:
The kinetic energy of the bullet is 5.4 × 10³ J
Explanation:
Hi there!
The equation of kinetic energy is the following:
KE = 1/2 · m · v²
Where:
KE = kinetic energy.
m = mass of the bullet.
v = speed of the bullet.
Let´s convert the mass unit to kg so that our result is in Joules:
64 g · ( 1 kg / 1000 g) = 0.064 kg
Then, the kinetic energy will be the following:
KE = 1/2 · 0.064 kg · (411 m/s)²
KE = 5.4 × 10³ J
