as the change in speed at the boundary of two materials is greater what happened to the angle of refraction (please help )
a. it becomes less
b. it becomes more
c. it stays the same
​

Answer:

(B) 15 N.m

Explanation:

The deceleration of the wheel is first found by using the following formula:

[tex]\alpha = \frac{\omega_f - \omega_i}{t}[/tex]

where,

α = angular acceleration = ?

ωf = final angular speed = 0 rad/s

ωi = initial angular speed = 12 rad/s

t = time = 0.4 s

Therefore,

[tex]\alpha = \frac{0\ rad/s - 12\ rad/s}{0.4\ s}\\\\\alpha = -30\ rad/s^2[/tex]

here, the negative sign shows deceleration.

Now, we find the torque responsible for this deceleration:

[tex]\tau = I\alpha[/tex]

where,

τ = torque = ?

I = rotational inertia = 0.5 kg.m²

Therefore,

[tex]\tau = (0.5\ kg.m^2)(30\ rad/s^2)\\[/tex]

τ = 15 N.m

Therefore, the correct answer is:

(B) 15 N.m

Answer:

Explanation:

There is no change in mass. Therefore, mass =  70 k g

Weight on Jupiter  ≈  1578  N

Answer:

120 volts

Explanation:

The output voltage is the voltage released by a device, such as a voltage regulator or a generator. Voltage regulators maintain constant voltage levels. A conductor carries the output voltage to various destinations, such as homes and businesses.

Answer:

to find the weight, use the following formula

F= m x g

in Earth---> 45 x 9.8= 441 N

in Moon---> 45 x 1.6= 72 N

Explanation:

I HOPE THIS HELPS!!! :)

The change in gravitational potential energy of a 45 kg weight that is moved from 2 m to 18 m on Earth and Moon are 7.056kJ and 1.152kJ respectively.

Gravitational potential energy is defined as the energy possessed by or acquired by an object due to a change in its position when it is present in a gravitational field. This can be said that gravitational potential energy is the energy which is related to the gravitational force or gravitation.

Gravitational potential energy is expressed as

U=m g h

Where, U = gravitational potential energy

m = mass

g = gravitational field

h = height

For above given example,

The change in gravitational potential energy for Earth

mass= 45kg

Difference in height [tex](H_2-H_1)[/tex]= 18-2= 16m

g= [tex]9.8m/s^2[/tex]

U= 45*16*9.8 = 7056J or 7.056kJ

The change in gravitational potential energy for Moon

mass= 45kg

Difference in height [tex](H_2-H_1)[/tex]= 18-2= 16m

g= [tex]1.6m/s^2[/tex]

U= 45*16* 1.6= 1152J or 1.152kJ

Thus, the change in gravitational potential energy of a 45 kg weight that is moved from 2 m to 18 m on Earth and Moon are 7.056kJ and 1.152kJ respectively.

Learn more about Gravitational potential energy, here:

https://brainly.com/question/19768887

#SPJ2

Answer:

Lunar eclipse

Explanation:

Lunar eclipse occurs when Earth comes in between sun and Moon. The moon is either partially or fully blocked and the moon sighting appears to be black from earth since the light rays coming from sun are blocked by Earth. Lunar eclipse occurs only at full moon. The moon is aligned with the position of earth and sun so that they all form a straight line.

Answer:

In order to create a new element you have to change the number of protons in a nucleus.

Answer:

The correct option is (C).

Explanation:

Electric current can be direct or alternating.

The direct current flows only in one direction. It is unidirectional.

The alternating current or an C current reverse its direction periodically.

So, the correct statement regarding the alternating current is (c) i.e. Electrons reverse direction periodically.

r

[tex]- \frac{mR^2 }{I } \ v[/tex]Answer:

a)      w = - [tex]\frac{m r }{I} v[/tex]  ,  b)   W = - ½ m_woman R² (1 + m_woman R / I²) v²

Explanation:

a) To solve this exercise, let's use the conservation of angular momentum.

We define a system formed by the table and the woman, therefore the torques are internal and the moment is conserved

initial instant. Before starting to move the woman

         L₀ = 0

final instant. After starting to move

         L_f = I w + m v r

the moment is preserved

        L₀ = L_f

         0 = Iw + m v r

         w = - [tex]\frac{m r }{I} v[/tex]                    (1)

the direction of the angular velocity is opposite to the direction of the linear velocity, that is, counterclockwise

b) for this part we use the relationship between work and kinetic energy

        W = ΔK

in this case the initial speed is zero and the final speed of the table, using the relationship between linear and angular variables

         v = w r

we substitute

          W = 0 - ½ I_total w²

          I_total = I + m_{woman} R²

          W = - ½ (I + m_woman R²)  ( [tex]\frac{m_{woman} R}{I} \ v[/tex]) ²

          W = - ½ (m_woman² R² + m_woman³ R³ / I²) v²

          W = - ½ m_woman R² (1 + m_woman R / I²) v²

Answer:

Some muscles in the body are “involuntary”, which means you can't control them. The heart is made of a special involuntary muscle called cardiac muscle, and this muscle is made up of cells called cardiomyocytes (which literally means “heart muscle cells” in Latin)

Answer:

c

Explanation:

diluted means weakened

Another term for weak solutions is dilute solution. Thus, the correct option for this question is C.

A weak solution may be defined as a type of solution that significantly partially dissociates into its ions in an aqueous solution or water. In contrast, a strong solution fully dissociates into its ions in water.

The concentration of the weak solution is found to be lower as compared to the strong solution. The word dilute also symbolizes the presence of less concentration in any solution.  

The main difference between weak and strong solutions is true that for strong solutions we are given a Brownian motion on a given probability space whereas for weak solutions we are free to choose the Brownian motion and the probability space.

Therefore, another term for weak solutions is dilute solution. Thus, the correct option for this question is C.

To learn more about Weak and strong solutions, refer to the link:

https://brainly.com/question/8676275

#SPJ2

Answer:

Following are the responses to the given question:

Explanation:

Please find the attached table.

[tex]\to t= 10\ /sec\\\\ \to v = 15\ m /sec\\\\ \to a= ?\\\\\to a=\frac{v}{t}\\\\[/tex]

       [tex]=\frac{15}{10}\\\\=1.5[/tex]

Answer:

Option B

Explanation:

Looking at the 3 galvanometer readings given above, for galvanometer A, the reading is -2 mA.

For galvanometer B, the reading is 4 mA.

While for galvanometer C, the reading is -5 MA

Thus, option B is correct.

Answer:

B, the second picture

Explanation:

edge 2022

Answer:

E = 0.4 kWh

Explanation:

Given that,

The power of a bulb, P = 40 W

Time, t = 10 hours

We need to find the energy used by the bulb. Let it is equal to E. So,

[tex]E=P\times t\\\\E=40\times 10\\\\E=400\ W-h\\\\or\\\\E=0.4\ kWh[/tex]

So, 0.4 kWh of energy would be needed.

Answer: 146,000 Wh or 146 kWh

Explanation:

65 days × 10 hours × 40 W = 146,000 Wh or 146 kWh

Answer:

The higher the pressure

Answer:

r = 14.13 m

Explanation:

Given that,

Charge 1 = +0.0129 C

Charge 2 = -0.00707 C

The force between charges, F = 4110 N

We need to find the distance between charges. Let the distance be r. The force between two charges is given by :

[tex]F=\dfrac{kq_1q_2}{r^2}\\\\4110=\dfrac{9\times 10^9\times 0.0129\times 0.00707}{r^2}\\\\r=\sqrt{\dfrac{9\times 10^9\times 0.0129\times 0.00707}{4110}} \\\\r=14.13\ m[/tex]

So, the distance between charges is equal to 14.13 m.

Answer:

14.13 m

Explanation:

acellus

The current drawn by a microwave is greater than the amount of current used by an electric bulb, hence the microwave consumes more power.

The amount of energy dissipated by an electrical appliance is the calculated using the following formulas;

P = I²R

where;

The current drawn by a microwave is greater than the amount of current used by an electric bulb, hence the microwave consumes more power.

Learn more about power here: https://brainly.com/question/13881533

#SPJ1

Answer:

Atoms

Explanation:

Answer:

an example for applied force is

Explanation:

The applied force is the force applied to the object to either displace it or change its shape.

HOPE THIS HELPS

Answer:

Reflection of light means the bouncing back of light in another direction after hitting a smooth polished surface

1) Angie of incidence is equal to the angle of reflection

2) The nornal ray, reflected ray and the incident ray all lie in the same plane

Answer:

I'm pretty sure its product.

Explanation:

Hope this helps and have a wonderful day!!!!

Answer:

Explanation:

306.12 Kg,

Answer:

The mass of an object weighing 3000N is 300kg

Explanation:

Here,

Weight (W) = 3000N is given

So,

we will use

W = mg

where,

m = mass of the body

g = acceleration due to gravity

Now,

W = mg

3000 = m × 10

m = 3000 ÷ 10

m = 300kg

Thus, The mass of an object weighing 3000N is 300kg

-TheUnknownScientist

Answer:

2.6m

Explanation:

The formula for calculating the wavelength is expressed as;

λ = v/f

v is the velocity

f is the frequency of vibration

Given

f = 7.80Hz

We need to get the velocity

For string;

f = V/2L

7.80 = V/2(1.3)

7.80 = V/2.6

V = 2.6 * 7.8

V = 20.28m/s

Get the required wavelength

λ = v/f

λ = 20.28/7.80

λ = 2.6m

Hence  the wavelength of the first harmonic is 2.6m

Answer:

2.5705594546378 mol

Explanation:

Used this calculator

http://www.endmemo.com/chem/mmass.php

Answer:

Mechanical

Explanation:

The tank is at rest. And energy of any substance at rest is known as potential energy.

Now, in forms of energy, potential energy is a type of mechanical energy.

Thus, the correct option is mechanical Energy.

Answer:

Car A has a velocity of 40 km/hr  west.

Explanation:

The velocity of an object is a vector quantity. It has both magnitudes as well as direction.

Arrows are used to show direction.

Car A is moving towards west. Car B is moving towards east-south direction. Car C is moving towards South direction. Car E is moving towards North direction.

So, the correct option is (a) i.e. Car A has a velocity of 40 km/hr  west.

Answer:

The Astronomical Unit (AU) is approximately [tex]92.96\times 10^{6}\,mi[/tex], the ratio of Astronomical Units per mile is [tex]r = 1\,AU\,:\,92.96\times 10^{6}\,mi[/tex].

Explanation:

The distance from the Earth to the Sun is approximately [tex]92.96\times 10^{6}\,mi[/tex], then the Astronomical Unit (AU) is approximately [tex]92.96\times 10^{6}\,mi[/tex]. The ratio can be described by the quantity of miles per Astronomical Unit, then we define:

[tex]r = 1\,AU\,:\,92.96\times 10^{6}\,mi[/tex].

Answer: Newtons second law of motion: the acceleration of an object is directly related to the net force and inversely related to its mass. ... So, the force/mass ratio (from the equation acceleration = force/mass) is the same for each. Therefore, the acceleration is the same and they reach the ground at the same time.

Explanation:

Hope this helps you! Have a good day!

Answer:

Newton's second law states that the acceleration of an object is directly related to the net force and inversely related to its mass. ... So, the force/mass ratio (from the equation acceleration = force/mass) is the same for each. Therefore, the acceleration is the same and they reach the ground at the same time.

Example:Newton's Second Law of Motion says that acceleration (gaining speed) happens when a force acts on a mass (object). Riding your bicycle is a good example of this law of motion at work. Your bicycle is the mass. Your leg muscles pushing pushing on the pedals of your bicycle is the force.

Explanation:

~Hope this helps

Answer:

C. unlikely to combine with other elements.

Explanation:

In Chemistry, electrons can be defined as subatomic particles that are negatively charged and as such has a magnitude of -1.

Valence electrons can be defined as the number of electrons present in the outermost shell of an atom. Valence electrons are used to determine whether an atom or group of elements found in a periodic table can bond with others. Thus, this property is typically used to determine the chemical properties of elements.

Noble gases are chemical elements with eight valence electrons and as such have a full octet. Some examples are argon, neon, etc.

Hence, the full octet makes the gas (neon) unlikely to combine with other elements.

Answer:

The bearings are generally ceramic, metal (stainless steel or chrome), and some are hybrids—such as ceramic balls with stainless races and cages.

Explanation:

good luck