75m X A car moves with a uniform velocity 21 ms-1 from position P and a truck moves from rest with uniform acceleration 2 ms-2 from position Q in the same time in the same direction.

i) Determine the distance travelled in 20 seconds.
ii) How many times the private car will meet? Analyze mathematically.​

Answer:

The dominant theory of the strong fields of magnetars is that it results from a magnetohydrodynamic dynamo process in the turbulent, extremely dense conducting fluid that exists before the neutron star settles into its equilibrium configuration.

How strong is a magnetar magnetic field?

It can generate the most intense magnetic field observed in the Universe. The field strength of a magnetar is one thousand trillion times stronger than Earth's and is so intense that it heats the surface to 18 million degrees Fahrenheit. We only know of about 10 magnetars in the Milky Way galaxy.

when we throw an arrow , we first stretch the string of the bow. while stretching the string of the bow, the work done by us in stretching the bowstring gets stored as potential energy in the bow. This potential energy of the bow is transformed into kinetic energy when the bowstring is released and this gives the momentum and Kinetic energy to the arrow.

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When an arrow is drawn back by a bow, the work done by us in stretching the bowstring gets stored at potential energy in the bow. This potential energy of bow is transformed into kinetic energy when the bowstring is released and this gives kinetic energy to the arrow.

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Answer:

If the DNA of the proteins changes, this is called a mutation.

Explanation: Hope it helps you :))))

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If a defibrillator is in use with the given potential difference and charge in the given time, the resistance of the person's chest is 120 Ohms.

From Ohm’s law;

V = I × R

Where V is the voltage or potential difference, potential difference, I is the current and R is the resistance.

Given that;

First, we calculate the current I.

Since current is the electric charge transferred per unit time.

I = Q/t

I = 0.16C / 0.004s

I = 40A

Now, the resistance of the person's chest will be;

V = I × R

R = V / I

R = 4800V / 40A

R = 120Ω

Therefore, If a defibrillator is in use with the given potential difference and charge in the given time, the resistance of the person's chest is 120 Ohms.

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The best way would be to test groups of each kind of fabric by exposing them to the same amount of water for the same amount of time. The correct option is A.

In conducting scientific experiments to compare test subjects such as the fabrics mentioned in the illustration, the test subjects must be subjected to the same conditions.

The outcome of the experiment will no longer be scientifically valid if the test subjects are not exposed to the same condition.

Thus, the two fabrics must be exposed to the same amount of water for the same amount of time in order to come to a valid conclusion about which is a better water repeller among the two.

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Since the displacement is equal to zero, the velocity from 30 to 40s will also be zero.

Velocity is the distance travelled by a body in a specific direction per time taken. It is measured in meter per second. That is, m/s

Given that a car started its journey at point A. After 30 seconds, the car had reached point B. The car stops at point B for 10 seconds. Then, the car turned around and arrived at point A after 15 seconds. The car stopped at point A for 20 seconds. The car then went on his way and get to the point C after 10 seconds.

To find the velocity from 30 to 40s, we must realize that velocity can also be defined as;

Velocity = displacement / time

The displacement from point A to B and back to A is equal to zero.

Therefore, The velocity from 30 to 40s is also zero.

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Plants have more food is the chemical energy.

Two north magnetic poles have been brought together is the magnetic energy.

A person has walked to the top of hill posses gravitational potential energy.

A balloon has gained negative charged after being rubbed with a wool cloth is the electric energy.

A spring has been compressed inside a toy.

Energy is the ability to do work.

There are different kind of energies like kinetic energy, potential energy, gravitational energy, heat energy, elastic energy, chemical energy, etc.

Thus, the statement are connected to the correct type of potential energies.

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In stretching or compressing the spring by a distance of x (in meters), one performs 1/2 (350 N/m) x² of work on the spring, or equivalently the spring performs -1/2 (350 N/m) x² of work on the door. This work is negative since the restoring force of the spring opposes the force used to stretch or compress the spring.

Then when the spring is allowed to relax, it performs 1/2 (350 N/m) x² of work to return it to equilibrium position. The force from the spring acts in the direction of the door's motion, so the work done is positive once more.

Now, the work done on the door …

• … to return it from 85.0 cm = 0.850 m to equilibrium is

1/2 (350 N/m) (0.850 m)² = 126.4375 J

• … to return it from 5.0 cm = 0.050 m to equilibrium is

1/2 (350 N/m) (0.050 m)² = 0.4375 J

• … to relax from 85.0 cm to 5.0 cm from equilibrium is

126.4375 J - 0.4375 J = 126 J

Answer:

22785 square inches

Explanation:

        A = 294 ÷ 20 = 14.7 m²

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The amount of energy required to raise the temperature of one gram of water by one celsius degree is called a calorie.

In physics, we can define it as a unit of measurement that defines the amount of energy to raise the temperature of 1 gram  of water by 1°C. Each material has its unique calorie, however by definition we use water as it is the lowest of all the elements.

Normally, calorimetry is directly linked with the thermal capacity that an element has to contain heat.

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Answer: it’s actually umbrella

Explanation: because

Answer:

The answer to the question is 72N

The formular for calculating force is;

Force = Mass× acceleration due to gravity

therefore 6kg×12m/s/s = 72N

Flying animals utilize their wings to create both lift and propulsion by moving them in relation to the body.

They both consist of fundamentally simple building blocks. They are composed of substance or mass. Atmospheric and molecular building blocks make up the world.

The differences between how living and non-living things fly;

1. Moving both living and non-living objects consumes energy. Flying animals utilize their wings to create both lift and propulsion by moving them in relation to the body.

In contrast to most air vehicles where the components that generate lift wings and thrust engines or propellers are distinct and the wings stay stationary.

Animal aviators like birds as well as natural parachuters like patagial as well as human inventions like aircraft as well as rockets that can power spacecraft and spaceplanes are just a few examples of the many things that can fly.

Hence there are similarities and differences between how living and non-living things fly.

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The maximum number of cubes that can be stacked on the inclined plane without sliding is determined as 8.

The net force on the box can be used to determine the maximum number of cubes that can be stacked without sliding.

The stack cubes must be at equilibrium.

∑Fx = 0

nW - μFₙ = 0

where;

n(mg)sinθ - μmgcosθ = 0

n(mg)sinθ  = μmgcosθ

nsinθ  = μcosθ

nsinθ  = cosθ

n = cosθ/sinθ

n = 1/tanθ

n = (1)/(1/8)

n = 8

Thus, the maximum number of cubes that can be stacked on the inclined plane without sliding is determined as 8.

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The kinetic energy of the phone right before it hits the ground is 9J.

The kinetic energy of the phone right before it hits the ground is calculated as follows;

K.E = ¹/₂mv²

where;

K.E = ¹/₂(0.08)(15)²

K.E = 9 J

Thus, the kinetic energy of the phone right before it hits the ground is 9J.

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1.41 × 10³⁰ MeV

As we know, E=mc², where E is energy, m is mass and c is the speed of light(i.e. 3×10⁸ m/s).

Given mass = 2.5 kgs

∴ E = (2.5)×(3×10⁸)² J = 22.5×10¹⁶ J

As our answer is in joules so we have to convert it into mega electron volt(MeV)

1 J = 6.242 × 10¹² MeV

⇒ 22.5×10¹⁶ J = 22.5×10¹⁶ × (6.242 × 10¹²) MeV

⇒1.41 × 10³⁰ MeV

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Answer:

2 Hz

Explanation:

the frequency of a wave is how many waves pass in one second. So, to find the frequency of this wave, we should look at how many wave cycles have occurred at 1 second.

2 full wave cycles are shown between 0.0 seconds and 1.0 seconds, making the frequency 2 Hz

The direction of the friction force F exerted by the horizontal surface on the crate will be in the left direction.

From the information given, the 85-lb force P is applied to the 200-lb crate, which is stationary before the force is applied.

mg = 200 ×  0.2248 × 9.8 = 440.608

The static friction force will be:

= 0.5 × 440.608

= 220.304N

Therefore, the static friction is greater than the force applied. Therefore, there'll be a static friction acting on the box on the left direction.

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The receiver of a signal must understand the code or language being used to avoid confusion and losses.

This is usually in the form of a sound or body movement and is involved in conveying messages to people.

The receiver must understand the code or language in order to prevent confusion or loss of lives and properties.

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Answer:

T - M g - Ff = M a     describes the acceleration of the object

T = M g + Ff      if the object moves at constant speed  (a = zero)

Ff = μ M g = .3 * 40 * 9.8 = 118 N     the force of friction

Ff will be in a direction opposite to the motion

M g = 40 kg * 9.8 m/s = 392 N

a) T = M g + Ff   for an object moving upwards

T = 392 + 118 = 510 N

b) T = M g - Ff     for an object moving downwards

T = 392 - 118 = 274 N

Answer:

Negative particles will be transferred to the sphere,

Assuming the sphere is not grounded the sphere will be negatively charged when the plastic rod is withdrawn,

(The sphere can be positively charged by grounding the sphere and bringing the rod close to the sphere and then remove the grounding to the sphere)

Care must be taken in noting if and when the sphere is grounded.

The extra energy allows the molecules to convert states of molecules.

When the temperature is increased , the body or particle is said to be heating.

The water in this pot is in the process of changing from a liquid to a gas. Thermal energy is still being added to the water as it vaporizes, but its temperature and the motion of its particles are not increasing.

When the liquid is converted to gas, the temperature reaches the boiling point of water. After boiling, the heat added up will only make the particles to convert its phase and go away in then atmosphere.

Thus, extra energy added helps molecules of water to change its state from liquid to solid.

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The answers to the questions are:

ABS is known as an Anti-lock braking systems (ABS) that act in the capacity of steering one in times in emergencies by bringing back traction to one's tires.

Note that it often helps to hinder  wheels from locking up and helping the driver to be able to steer to safety.

When vehicle wheels are about to lock, the ABS senses the impending lock up and prevents this from occurring is true as that is its function.

Note that Electronic stability helps to control helps to the risk of rollover crashes, such as are common with SUVs.

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Answer:

  0.8976 seconds

Explanation:

The period of oscillation for the simple harmonic motion can be found using the formula ...

  T = 2π√(d/g)

where d is the displacement of the spring due to the attached weight, and g is the acceleration due to gravity.

__

For d = 0.20 meters, the period is ...

  T = 2π√(0.20/9.8) ≈ 0.8976 . . . . seconds

_____

Additional comment

The formula for the oscillator period is usually seen as ...

  T = 2π√(m/k)

where m is the mass in the system and k is the spring constant. The value of the spring constant is calculated from ...

  k = mg/d

Using that in the formula, we find it simplifies to ...

  [tex]T=2\pi\sqrt{\dfrac{m}{k}}=2\pi\sqrt{\dfrac{m}{\left(\dfrac{mg}{d}\right)}}=2\pi\sqrt{\dfrac{d}{g}}[/tex]

Answer:

4.0208 x 10^16 meters

Explanation:

speed of light in m/s   *      # seconds in a year      * 4.25 years =

2.99792 x 10^8   *        3600*24*365.25  *     4.25 = 4.0208 x 10^16 m

Answer:

The answer is B

Explanation:

When inflation increases, the cost of goods increases. The correct option is B.

Generally speaking, inflation raises the price of products sold. The price of producing and purchasing those things rises together with the prices of goods and services owing to inflation.

This can be attributable to elements like escalating manufacturing costs, rising input costs, and shifting dynamics of supply and demand.

As a result, companies might need to modify their pricing plans to take inflation-related cost increases into account, the cost of goods typically increases when inflation occurs.

Thus, the correct option is B.

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Answer:

If she stands on the North side of a river flowing to the East at 5 mph,

she must head towards the SouthWest to arrive on the South side of the river directly across from her starting point and we have

x^2 + 5^2 = 10^2 where x is her speed directly across the river

x = (75)^1/2 = 8.66 mph towards the South

sin theta = 5 / 10 = 1/2

She must angle the boat at 30 deg from straight South