The direction of a force can be represented by the length of an arrow.<br> True<br> False

How does Newton's second law of motion can be used to calculate the acceleration of an object?

Alex777 [14]

Newton's second law of motion can be formally stated as follows: The acceleration of an object as produced by a net force is directly proportional to the magnitude of the net force, in the same direction as the net force, and inversely proportional to the mass of the object.

4 0

4 years ago

Only 25% of the intensity of a polarized light wave passes through a polarizing filter. What is the angle between the electric f

Firdavs [7]

Answer: Only 25% of the intensity of a polarized light wave passes through a polarizing filter. Then the angle between the electric field and the axis of the filter will be 60 degrees.

Explanation: To find the answer of the problem given, we have to know about the Malu's law of polarization.

<h3>What is Malu's law of polarization?</h3>

This law states that, when a beam of completely polarized light is passed through an analyzer, then then intensity I of the transmitted light varies directly as the square of the angle $\alpha$ between the transmission direction of the polarizer and the analyzer.
The expression for this law will be,

$I=I_0cos\alpha$

Where, I₀ is the maximum intensity of the transmitted light through the polarizer.

<h3>How to solve the problem?</h3>

From the question, it is clear that, the 25% of the intensity of a polarized light wave passes through the filter.

$\frac{I}{I_0} =0.25\\$

Thus, the angle between electric field and the axis of the filter is,

$cos^2\alpha =0.25\\cos\alpha =\sqrt{0.25} =0.5\\\alpha =cos^-1(0.5)=60 degrees$

Thus, we can conclude that, the angle between the electric field and the axis of the filter will be 60 degrees.

Learn more about the Malus law of polarization here:

brainly.com/question/28020002

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4 0

2 years ago

Ions are unequally distributed across the plasma membrane of all cells. This ion distribution creates an electrical potential di

nekit [7.7K]

Answer: Resting Membrane Potential

Explanation:

The <u>resting membrane potential</u> refers to the difference in voltage between the inside and outside of the cell membrane when the cell is at physiological rest. It should be noted that <u>the cell membrane is a selective semipermeable barrier, which only allows the transit through it of certain molecules and prevents the transit of others. </u>

This selectivity causes an uneven distribution of charged particles (ions), as the membrane only accepts some types of ions.

Now, in the case of neurons, which are electrically excitable nerve cells; the transport of electrical signals is due to these changes in the permeability and asymmetric distribution of ions (mainly sodium and potassium) when the neuron is not excited (at rest).

4 0

3 years ago

A circular coil of radius 5.0 cm and resistance 0.20 is placed in a uniform magnetic field perpendicular to the plane of the coi

levacccp [35]

B is your answer your welcome

8 0

3 years ago

A 200kg block is going down a frictionless surface on a 20 degree ramp (down the ramp is positive and up the ramp is negative).

nalin [4]

Magnitude of acceleration is 3.35 m/ $s^{2}$

Explanation:

Here, the box is sliding down in a frictional force. When we draw the free body diagram, the forces acting on it are normal force and gravitational force.
We know that normal force would act in a perpendicular direction.

The gravitational force has x and y components since it is sliding down. These two components are mg cosθ and mg sinθ, where θ is the angle of the ramp. Since the motion is along the x-direction, the force act on it is mg sinθ.

According to Newton's second law, F = ma, to find acceleration a = $\frac{F}{m}$
When you substitute the x-axis force, the equation will simplify into

a = g sinθ, so the answer is 3.35 m/ $s^{2}$

3 0

3 years ago

The direction of a force can be represented by the length of an arrow. True False