What are the statements? both of the objects do move attract and maybe that is the answer
Answer:
The self-inductance is 
Explanation:
From the question we are told that
The number of loops is 
The length of the rod is 
The radius of the rod is 
The self-inductance for the solenoid is mathematically represented as
Now the cross-sectional of the solenoid is mathematically evaluated as
substituting values
and 
is the permeability of free space with a value 
substituting values into above equation
Answer:
14J
20000J
200J
Explanation:
formula :W=FS
W:work done
F:force (N)
S:displacement moved in direction of force (m)
1) 20N×0.7m
=14J
2) 400N×50m
= 20000J
3) 10N×20m
=200J
Answer:
The forward speed of the disk is 4.07 m/s
Explanation:
Step 1: Data given
Angle = 25 °C
Distance the disk has rolled = 3.0 m
Step 2= Calculate the initial energy
Since the disk is, at moment t=0, at rest and at a height we only have potential energy
Ei = m*g*h
⇒with E = the potential energy
⇒with m = the mass of the disk
⇒with g = 9.81 m/s²
⇒with h = the height = x*sin 25° = 3*sin25°
Ei = m*g*X*sin25
Step 3: Calculate the final energy
Ef = 1/2 (mv²) + 1/2 Iw²
Ef = 1/2 (mv²) + 1/2(mR²)(v/R)²
Ef = 1/2mv² + 1/4 mv²= 3/4 mv²
Step 4: The law of conservation of energy
Ei = Ef
m*g*X*sin25 = 3/4 mv²
g*X*sin25 = 3/4 v²
Step 5: Calculate v
v = √(4/3 * g*X sin25°)
v = √(4/3 * 9.81*3 sin25°)
v = 4.07 m/s
The forward speed of the disk is 4.07 m/s
The initial horizontal velocity of the rock, in m/s is 21.241 m/s.
<h3>What is projectile?</h3>
When an object is thrown at an angle from the horizontal direction, the object is said to be in projectile motion. The object which follows the projectile motion.
Time taken by the stone to reach the ground is
t = √2h/g
t = √(2x 86)/9.81
t = 4.19s
The horizontal velocity is
V(x) = Horizontal distance traveled / Time taken t
Put the values, we get
V(x) = 89 m/4.19 s
V(x) = 21.241 m/s
Thus, the horizontal velocity is 21.241 m/s
Learn more about projectile.
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