c) The infra-red detectors are made from thermocouples soldered to blackened metal plates. These are connected to galvanometers. In the space below, draw
a labelled diagram of a thermocouple. [2] [Total 6]

(c) When the two pulses completely overlap on the string forms a straight line.

A single disturbance that travels via a transmission medium is referred to as a pulse. This medium might be formed of stuff or a vacuum, and it might be endlessly large or finite in size.

Consider two pulses that are identical in shape and proceed in opposite directions along a string, with the exception that one has positive displacements of the string's elements while the other has negative displacements.

On the string, the two pulses blend together completely.

The pulses completely balance one another out in terms of removing string elements from equilibrium, yet the string still moves. Shortly after the string is once again shifted, the pulses will have passed each other.

The correct option is (c)

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The nucleus of an atom will have a positive charge due to the existence of protons, which are positively charged subatomic particles.

Protons and neutrons are present in an atom's nucleus. We are aware that a proton has a charge of + 1 and a neutron has a charge of 0 (or no charge). As a result, the atom's nucleus will always be positively charged. A nucleus is a name for the dense area in the middle of an atom. Because there are positively charged subatomic particles present, the nucleus usually has a positive charge. The subatomic particles, which are present in atoms but far smaller than atoms, are there. Protons, neutrons, and electrons are the three primary subatomic particles found in matter. An atom's nucleus contains protons and neutrons, while its outermost nucleus contains electrons. Neutrons are subatomic particles with a charge of zero, whereas protons are positively charged.

Therefore, the nucleus of an atom will always have a positive charge. Consequently, an atom's nucleus has a positive charge because of the presence of protons.

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Differentials are the components of a car that transfer engine torque to the axles allowing the wheels on the same axle to turn at different speeds.

There are two differentials in a car. The first one is located on the rare wheels and the second one is located on the front wheels.

The purpose of differentials is to allow the wheels to turn at different speeds required when the car is making a turn. The differentials send the torque from the transmission to the drive wheels.

During the turn, the differentials allow the front and rare wheels to turn at different speeds.

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Answer:

The answer is positive.

Explanation:

In a middle of an atom, nucleus, contain neutrons (neutral charge) and protons (positive charge) so it will become positively charge nucleus.

Answer:

i think its unbalance because one side has 25 newtons and the other is 20 newtons there not the same

The  possible sequence in the life cycle of a massive star is protostar, star, super red giant, planetary nebula, supernova, black hole.

A supernova is the enormous, dazzling explosion of a star. Supernovae or supernovas are the plural forms of its abbreviation, SN or SNe. This brief astronomical event occurs either in the latter stages of the formation of a large star or when a white dwarf is set off into uncontrolled nuclear fusion. The original object, referred to as the progenitor, either falls into a neutron star or a black hole, or entirely disintegrates. Before fading over the course of several weeks or months, the optical luminosity of a supernova can reach a peak that is similar to the luminosity of an entire galaxy. The latest supernova in the Milky Way to be directly observed was Kepler's Supernova in 1604, however more recent supernova remnants have been found.

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Answer:

F L = W * L/2    

F = W / 2 = 42.5 N

The crowbar is uniform and can be replaced by a point mass of 85 N at distance of L/2 and the applied force is at a distance of L

Answer:

1-physical properties, and chemical properties.

2-The physical properties of matter are those characteristics that can be measured without altering the atomic structure, while the chemical properties of matter are those.

3-For the change of state to occur, the temperature must be constant. The melting point is an intensive physical property of matter; this means that it is not linked to the amount of substance or the size of the body.

The fundamental frequency of the tube is 0.240 m long, by taking air temperature to be [tex]37^o[/tex]C is 367.42 Hz.

A standing wave is basically a superposition of two waves propagating opposite to each other having equal amplitude. This is the propagation in a tube.

The fundamental frequency in the tube is given by

[tex]f=\frac{v_T}{4L}[/tex]

where, [tex]v_T=v\sqrt{\frac{T}{273} }[/tex]

Since, T=37+273 K = 310 K

v = 331 m/s

[tex]\therefore v_T=331\sqrt{\frac{310}{273} } = 352.72 \ m/s[/tex]

Using this, we get:

[tex]f=\frac{352.72}{4(0.240)} \\f=367.42 \ Hz[/tex]

Hence, the fundamental frequency is 367.42 Hz.

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Answer:second law

Acceleration of an object depends on the mass of the object and the amount of force applied

Answer:

Animals cerate Carbon Dioxide through the process of respiration.

All animals exhale carbon dioxide out through respiration and increase the level of carbon dioxide in the atmosphere and this is intaken by the plants for photosynthesis.

Carbon cycle is the geological  process that balance the amount of carbon dioxide in the atmosphere and biosphere. Carbon dioxide is an essential gas that maintains the living condition on earth.

All animals inhales oxygen and exhales carbon dioxide out. This carbon dioxide is used by plants to carry photosynthesis in plants. Plants absorb this carbon dioxide and combine with water forming oxygen gas and glucose.

This process repeats cyclically and the level of oxygen and carbon in the atmosphere gets balanced. Therefore, animals have a significant role in carbon dioxide cycle and oxygen cycle.

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Answer:

From the given options, the option (D) is correct. Because Al is the aluminium which is located in period 3 of the periodic table.

Explanation:

We know that the 3rd period contains 8 elements which are as follows:

The sodium and magnesium, the first 2 elements, are members of the s-block of the periodic table, while the rest of the members are the elements of the p-block.

Thus, from the given options, the option (D) is correct. Because Al is the aluminium which is located in period 3 of the periodic table.

Answer:

B) Friction force

Explanation:

if the object is heavy then it will need more force to move it unlike a tennis ball for example.

Explanation:

fall at a faster velocity than what it was thrown! Hope this helps!

The minimum energy required is 3.02 x 10²³ joule.

We need to know about relativistic energy to solve this problem. The rest energy of the object can be determined by

Eo = m₀ . c²

where Eo is rest energy, m₀ is rest mass and c is the speed of light (3 x 10⁸ m/s).

The total energy of object can be described as

E = Eo / √(1 - v²/c²)

where E is total energy, v is the object speed.

From the question above, we know that :

m₀ = 2.4 x 10⁶ kg

c = 3 x 10⁸ m/s

v = 0.7c

Find the rest energy

Eo = m₀ . c²

Eo = 2.4 x 10⁶ . (3 x 10⁸)²

Eo = 2.16 x 10²³ joule

Determine the total energy

E = Eo / √(1 - v²/c²)

E = 2.16 x 10²³ / √(1 - (0.7c)²/c²)

E = 2.16 x 10²³ / 0.71

E = 3.02 x 10²³ joule

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Answer:

b

Explanation:

the cockroach was rubbing up against something

Answer:

Explanation:

The potential energy of a body can be found by using the formula

PE = mgh

where

m is the mass

h is the height

g is the acceleration due to gravity which is 10 m/s²

From the question we have

PE = 250 × 10 × 32

We have the final answer as

Hope this helps you

Answer:

Explanation:

VR = Velocity ratio = Distance moved by effort/Distance moved by load

Given:

Distance moved by effort = 20m

Distance moved by Load = 5m

VR = 20/5

VR = 4

Hence the velocity ratio of the car is 4

Answer:

Impairs one's ability to function

Explanation:

Answer:

Impairs one's ability to functionExplanation:

I just took the test

Answer:

185.3m

Explanation:

Given parameters:

Initial velocity  = 10m/s

Final velocity  = 21m/s

Time  = 12s

Unknown:

Total distance traveled by the car = ?

Solution:

To solve this problem, we use that appropriate motion equation:

            v² = u² + 2as

v is the final velocity

u is the initial velocity

a is the acceleration

s is the unknown distance

t is the time taken;

    acceleration = [tex]\frac{v - u}{t}[/tex]

                   a  = [tex]\frac{21 - 10}{12}[/tex]   = 0.92m/s²

 now;

            v² = u² + 2as

            21²  = 10²  + 2(0.92)(s)  

            441 = 100 + 1.84s

           441 - 100  = 1.84s

                  s  = 185.3m

Answer:

15m/s²

Explanation:

According to Newton's second law;

Force = mass * acceleration

Given

Force = 1.5N

mass = 0.10kg

Required

acceleration

Substitute into the expression;

1.5 = 0.1a

a = 1.5/0.1

a = 15m/s²

Hence the acceleration that the puck move across the air table is 15m/s²

Answer:

0.675 kg m/s

Explanation:

Momentum = mass x velocity

= 0.015 x 45 = 0.675 kg m/s

P.S. I'm not sure of this answer,  so it might be a good idea to check this with some other sources.

Change in momentum  = 0.675 kg m/s

Momentum  is a  property of a moving body that the body has by virtue of its mass and motion and that is equal to the product of the body's mass and velocity

change in momentum = final momentum - initial momentum

final momentum  = m*v = 0.015 *  45 = 0.675 kg m/s

initial momentum = m* v = 0.015 * 0 = 0

change in momentum  = 0.675 kg m/s

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At extreme position, velocity is zero but acceleration is maximum in Simple Harmonic motion because of maximum displacement of pendulum.

At extreme position, velocity is zero but acceleration is maximum in Simple Harmonic motion because at extreme points the motion of the pendulum is at zero which means that velocity is zero but the pendulum attains maximum displacement. Acceleration is maximum when it gets the extreme position because the displacement is maximum at extreme position. If the velocity of the simple harmonic motion is maximum, the acceleration must be equal to zero and we know that the acceleration is equal to zero only when the particle or object is at initial position.

So we can conclude that at extreme position, velocity is zero but acceleration is maximum in Simple Harmonic motion because of maximum displacement of pendulum.

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The environment because maintaining a healthy environment is central to increasing quality of life and years of healthy life.

Explanation:

Answer:

t=v/a

Explanation:

Acceleration is defined as the rate of change of velocity with time. It is mathematically expressed as;

  Acceleration  = [tex]\frac{Final velocity - Initial velocity}{time}[/tex]  

The change in velocity per unit of time is the acceleration

 From this equation;

      time  = [tex]\frac{change in velocity }{acceleration}[/tex]  

This expression is analogous to the expression chosen.