Electromagnet Fluctation

A uniform ladder 5.0 m long rests against a frictionless, vertical wall with its lower end 3.0 m from the wall. The ladder weigh

DiKsa [7]

Answer:(a)360N,(b)171N,(c)2.702m

Explanation:

(a)Maximum Friction Force = $\mu \left ( N\right )=0.4\times \left ( 740+160\right )$

=360 N

$cos\theta =\frac{3}{5}$

$sin\theta =\frac{4}{5}$

(b)Moment about Ground Point

$740\times 1\times cos\theta +2.5\times 160\times cos\theta -N_15sin\theta$

$N_1tan\theta =1140$

$N_1=171 N$

$N_1=f=171 N$

(c)

$740\times x\times cos\theta +2.5\times 160\times cos\theta -N_15sin\theta$

Here maximum friction force can be 360 N

Therefore $N_1=360 N$

Where x is the maximum distance moved by man along the ladder

$360\times 5\times \frac{4}{3}=740x+160\times 2.5$

740x=2000

x=2.702m

5 0

3 years ago

What season is the Southern hemisphere in

Iteru [2.4K]

Answer:

hope this answer helps this is what I understand

3 0

3 years ago

Read 2 more answers

Describe briefly with used of practical knowledge the effect of the voltage stores across and current

DaniilM [7]

Answer:

Answer in explanation

Explanation:

The path of flow of circuit is called electric circuit. In an electric circuit, resistances are connected in two different ways, which are:

1- Series Combination of Resistances

2- Parallel Combination of Resistances

Series combination of resistances

In series combination resistors are connected end to end, and there is only one path for the flow of current.

Characteristics Of Series Circuit:

1. In series circuit there is only one path for the flow of current.

2. Same amount of current flows through each resistor.

I = I₁ = I₂ = I₃ = In

3. Total voltage of the battery is equal to the sum of voltages across each resistor.

V = V₁ +V₂ + V₃ + ... + Vn

4. In series combination the combined resistance of the resistors can be obtained by adding the value of each resistor.

R = R₁ + R₂ + R₃ + … + Rn

Parallel combination of resistances

Resistances are set to be connected in parallel, when each of them is connected directly from the terminals of electric source.

Characteristics Of Series Circuit:

1. There are more than one path for the flow of current.

2. The value of potential difference remains constant on each resistor.

V = V₁ = V₂ = V₃ = Vn

3. Total current is equal to the sum of current passing through each resistor.

I = I₁ + I₂ + I₃ +...+ In

4. Reciprocal of equivalent resistance is equal to the sum of reciprocals of resistances connected in parallel.

1/R = 1/R₁ + 1/R₂ + 1/R₃ + … + 1/Rn

The circuit diagrams are in attachment.

7 0

3 years ago

The strength of friction depends on what two factors

makvit [3.9K]

How hard the surfaces push together and the types of surfaces involved.

4 0

3 years ago

The spring of a toy car stores 10 J of potential energy. Only 8 J of energy changes to kinetic energy as the car moves. What hap

FromTheMoon [43]

Answer:

It will be converted into thermal energy

Explanation:

In an ideal world, energy can be converted from one form into another without any loss of energy.

However, in the real world this does not really happen, because there are some frictional forces always acting on the system we are considering. Because of this, part of the mechanical energy of the system is always converted into thermal energy (as heat), and it cannot be "retrieved" back, so it becomes a form of energy that cannot be used anymore.

In this example, the initial mechanical energy of the system is the elastic potential energy of the spring, which is

U = 10 J

Later, when the spring is released, this energy is converted into kinetic energy of the moving car. However, as we are told, only part of this energy is actually converted, which is

K = 8 J

However, the law of conservation of energy states that energy cannot be created or destroyed, but only transformed: this means that the other 2 J of energy have not been actually destroyed, but they have only been converted into another form of energy, which is thermal energy, due to the presence of frictional forces.

3 0

3 years ago