Answer:
A solenoid is a device comprised of a coil of wire, the housing and a moveable plunger (armature). When an electrical current is introduced, a magnetic field forms around the coil which draws the plunger in. More simply, a solenoid converts electrical energy into mechanical work.
Explanation:
The coil is made of many turns of tightly wound copper wire. When an electrical current flows through this wire, a strong magnetic field/flux is created.
The housing, usually made of iron or steel, surrounds the coil concentrating the magnetic field generated by the coil.
The plunger is attracted to the stop through the concentration of the magnetic field providing the mechanical force to do work.
Answer:
The acceleration of the car, a = -3.75 m/s²
Explanation:
Given data,
The initial velocity of the airplane, u = 75 m/s
The final velocity of the plane, v = 0 m/s
The time period of motion, t = 20 s
Using the I equations of motion
v = u + at
a = (v - u) / t
= (0 - 75) / 20
= -3.75 m/s²
The negative sign indicates that the plane is decelerating
Hence, the acceleration of the car, a = -3.75 m/s²
Answer:
3.28 m/s
Explanation:
From the question,
Applying newtons ,
F = mv²/r........................ Equation 1
Where m = mass of the rock, v = speed, r = radius of the circle, F = Centriputal force.
But,
Centriputal force is equal to the weight of the rock
F = mg................. Equation 2
Equate equation 2 into equation 1
mg = mv²/r
Therefore,
v = √gr...................... Equaion 3
Given: r = 2.2/2 = 1.1 m
Constant: g = 9.8 m/s²
Substitute into equation 3
v = √(9.8×1.1)
v = √(10.78)
v = 3.28 m/s
Hence the minimum speed is 3.28 m/s
Answer:
420mph
Explanation:
This is a weird thing to do for an account.
T = 12.4 h, x(t) = .250 d (displacement)
The total amplitude is half of the distance d from the highest to lowest level.
Using the equation x(t) = x(m) cos(wt + φ), we get:
.250d = .5d cos(wt + φ)
To find w, use the equation w = 2π / T
.250d = .5d cos((2π / 12.4)t + φ)
.250d = .5d cos((2π / 12.4)t + 0)
Solve the equation for t.
.250d / .5d = cos ((2π / 12.4) t)
arccos(.5) = 2π / 12.4 * t
arccos(.5) * 12.4 / 2 / π = t
t = 2.066666 hours
