Same diagram... Which location shows SUMMER in the SOUTHERN hemisphere? *

Voltage is defined as the. Select one: a. force that causes electrons to flow b. opposition to current flow c. basic unit in whi

elena-s [515]

Voltage is defined as the force that causes electrons to flow. That is option A.

<h3>What is a voltage?</h3>

A Voltage is defined as an electromotive force and the potential difference in charge between two points in an electrical field.

It is equally known as the force that causes electrons of a current to flow.

Mathematically, it's = V = current × resistance.

Learn more about current here:

brainly.com/question/1100341

#SPJ1

4 0

2 years ago

A ray of light traveling in glass (refractive index na) reflects at the flat interface between the glass and water (refractive i

pickupchik [31]

Answer:

θr will increase.

Explanation:

We know that when light travel from one medium to another medium the relationship between refractive index and angle given as

na. sinθa = nb . sinθr

$sin \theta _r=\dfrac{n_asin\theta _a}{n_b}$

If na is increased (by using a different type of glass) but θa is kept the same then sinθr will also increase.

So answer is θr will increase.

5 0

3 years ago

Why is it important to use the correct number of significant digits when

Artemon [7]

Answer:

D

Explanation:

Scientists use significant figures to avoid claiming more accuracy in a calculation than they actually know.

6 0

3 years ago

Read 2 more answers

A 0.26 kg rod of length 80 cm is suspended by a frictionless pivot at one end. It is held horizontal and released.

Daniel [21]

Answer:

a) $a_{center} = 7.38 ~m/s^2$

b) $a_{end} = 14.77 ~m/s^2$

c) $v_{center} = 2.43~m/s$

Explanation:

a) Immediately after the rod is released, <u>the rod is still horizontal but now subject to gravity.</u> Since one end of the rod is fixed, then the weight of the rod applies a torque. Then by Newton's Second Law, the acceleration can be found.

$\tau =I\alpha$

where I is the moment of inertia of the rod with respect to its fixed end, and α is the angular acceleration.

The net torque of the rod is

$\vec{\tau} = \vec{r} \times \vec{F}\\\tau = rF\sin(90) = rF$

where r is the distance from center of the mass to the fixed end, so r = 0.4 m.

The weight of the rod is w = mg = 0.26 x 9.8 = 2.54 N.

So the net torque is τ = 1.01 Nm.

The moment of inertia of the rod is

$I = \frac{1}{3}mL^2 = \frac{1}{3}(0.26)(0.8)^2 = 0.055~kg m^2$

So, the Newton's Second Law yields

$\tau = I\alpha\\\alpha = \frac{\tau}{I} = \frac{1.01}{0.055} = 18.47$

<u>The relation between angular acceleration and linear acceleration is a = αr </u>

So, the linear acceleration of the rod is

$a = \alpha r = 7.38~m/s^2$

b) Using the same relationship between angular acceleration and linear acceleration, the linear acceleration of the end of the rod can be found.

$a = \alpha L = 14.77~m/s^2$

c) The conservation of energy can be used to find the velocity when the rod is vertical.

$K_1 + U_1 = K_2 + U_2\\0 + mg(L/2) = \frac{1}{2}I\omega^2 + 0\\(0.26)(9.8)(0.4) = \frac{1}{2}(0.055)\omega^2\\\omega = 6.08~rad/s$

The linear velocity is v = ωr, so

v = 2.43 m/s.

4 0

3 years ago

A 60kg student is sitting in a chair and is not moving. what is the force of a student acting on the chair? what is the force of

vazorg [7]

The force with which the student is acting in the chair and the force of the chair acting on the student is 588 N

Explanation:

There are two kinds of forces acting on you when you are sitting on the chair, they are the gravitational force and the force exerted by the chair on you.
The forces acting on the chair when you are sitting are the gravitational force and the force exerted by you.
As per Newton's third law of motion, for every action, there is an equal and opposite reaction.
Hence, F = ma

that is, F = 60 * 9.8

=588 N

So, 588 N force should be applied from both sides then only you can sit properly in the chair.

7 0

3 years ago