How much force is needed to accelerate a 1,800kg car at rate of 1.5 m/s2?

Answer: C

Gauge pressure = 156 kPa ,

What is absolute pressure =?

     We know that,

      absolute pressure = gauge pressure + atmospheric pressure

                           Pabs = Pgauge + Patm

                                     = 156 + 101.3             (since atm.pr. = 101.3 Kpa)

                                     = 257.3 KPa absoulte

                                     approximately  = 256 KPa absolue

Number 1 is correct.

The amount of power has decreased. This is most likely the result of

A. less work being done over a longer period of time.

Power is defined as work divided by time, or P = W / t. Therefore, as work increases and time decreases power increases.

Performance is the speed at which work is completed. The rate in this case means per unit time. Performance is calculated by dividing the work done by the time it takes to complete the work.

As already mentioned, performance is the speed of work. Therefore, it can be calculated by dividing the work done by the time. The formula for power is: Where P is the power, W is the work done, and t is the time required.

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Given that:

spring compressed ( x) = 0.2 m

                        Work (W) = 24 J

 determine , spring constant (x)=?

               We know hat ,

                      Work   (W) = (1/2). k.x²

                                   24 = 1/2 ( k × 0.2²)

                                     48 = k × 0.2²

                                      k = 1200 N/m

I think it is there is no change in the energy's sunlight

To understand acceleration, you need to know speed and velocity.

Why?

Acceleration is the change in velocity, and the velocity equation is:

velocity = distance / time     Units: (m/s)

If a change in position means an object has a velocity, then that means that a change in velocity has an acceleration (I recommend you look at the graphs, it will help a lot to understand the relationship between each).

Now that we have some background, lets use it to answer the problem!

The change in velocity is from 25 m/s to 10 m/s, and we have a time. Lets plug it into the (average) acceleration equation so we can visualize it better!

The symbol delta means "change" : Δ

a = Δv / Δt

expanded to:

a = vf - vi / tf - ti  

(vf = velocity final, vi = velocity initial, tf = time final, ti = time initial)

So if the train's speed went from 25 m/s to 10 m/s, then that means that 10 m/s is our final velocity and 25 m/s is the initial:

a = 10 - 25 / 240

a = -15 / 240

a = -0.0625 m/s^2

Since we ended up with a negative number, it means that the train has a negative acceleration!!!!!

The fast way to do this:

25 m/s is bigger than 10 m/s, so that means that to go from 25 m/s to 10 m/s you have to slow down--otherwise known as putting on your brakes. So if the change in speed is negative then the acceleration will be negative.

In other words, if your final speed is less than your initial speed then your acceleration would be negative.

Sorry for the long explanation! I hope you never struggle with this again though!

Hope it helped,

Answer: negative acceleration

Explanation:

Formula for density is

D = mass/volume

So...

Answer: 0.3479 g/cm^3

hope this helps!

The density of the sphere is approximately 3.58×10⁶ g/m³  or 3.58g/cm³.

To calculate the density (ρ) of an object, you can use the formula:

ρ= 4/3  πr³

​where m is the mass of the object and r is its radius.

In this case, the mass of the sphere is m=12g and the radius is r=2cm (r=0.02m in SI units).

Plugging in the values:

ρ= 12g / 4/3 π(0.02m)³

​First, calculate the volume of the sphere:

Volume= 4/3 π(0.02m)³

Volume≈3.35×10⁻⁶ m³

Now, divide the mass by the volume to find the density:

ρ= 12g / 3.35×10⁻⁶m³

ρ≈3.58×10⁶ g/m³

Therefore, the density of the sphere is approximately 3.58×10⁶ g/m³  or 3.58g/cm³.

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Answer: Chemical energy to kinetic energy, heat energy, sound energy and light energy.

Explanation: The crackers are made up of gunpowder which is a chemical substance. When this gunpowder powder burns it produces smoke and hot gases (generation of heat and light energy) which create high pressure inside the can and blows the can open, and make all the tiny particles of powder blow out and chemical energy is converted to kinetic energy.

It makes the air to push outward and when it collapses back, it leads to generation of sound. So the chemical energy stored in gunpowder gets converted to sound.

To determine if a chemical reaction represents a single displacement reaction or a double displacement reaction, examine the reactants and products. Single displacement reactions involve the replacement of an element in a compound, while double displacement reactions involve the exchange of ions between two compounds.

In order to determine if a chemical reaction represents a single displacement reaction or a double displacement reaction, you need to examine the reactants and products in the reaction equation.

For a single displacement reaction, one element is replaced by another element in a compound. This can occur when a more reactive element displaces a less reactive element. An example of a single displacement reaction is the reaction between zinc metal and hydrochloric acid:

Zn(s) + 2HCl(aq) → ZnCl2(aq) + H2(g)

On the other hand, a double displacement reaction involves the exchange of ions between two compounds. This can result in the formation of a precipitate or a gas. An example of a double displacement reaction is the reaction between sodium sulfate and barium chloride:

Na2SO4(aq) + BaCl2(aq) → 2NaCl(aq) + BaSO4(s)

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When a ball is thrown against a wall, the ball exerts a force on the wall, and the wall exerts an equal force in the  opposite direction back on the ball.  (D)

Answer:

The ball exerts a force on the wall and the wall exerts a force back.

Explanation:

When a ball is thrown against a wall, the ball exerts a force on the wall and the wall exerts a force back. This is due to Newton's third law of motion. According to this law, every action have equal and opposite reaction and both action and reaction forces acts on different object.

In this case, when a ball is thrown against a wall, the wall exerts an equal force on the the ball but in opposite direction. It follows the newton's third law.

Hence, the correct option is (D).  

Magnets can have zero resistance due to the properties of superconductors. These materials exhibit zero electrical resistance and perfect diamagnetism at very low temperatures, a phenomenon known as the Meissner effect. Consequently, the magnetic field within a superconductor is zero, and once a current is established, it will persist without any applied voltage source.

Magnets are capable of having zero resistance due to the properties of superconductors. Superconductors exhibit zero electrical resistance and perfect diamagnetism when cooled down to very low critical temperatures. This expulsion of all magnetic fields results in a net magnetic field of zero within the superconductor, even in the presence of an applied magnetic field, known as the Meissner effect.

An interesting consequence of this zero resistance is that once a current is established in a superconductor, it will persist without any applied voltage source. Furthermore, with a magnetic object, each surface you can imagine that encloses all or part of the magnet ultimately has zero net flux of magnetic field lines flowing through the surface. Just as many outward-flowing lines from the magnet's north pole pass through the surface as inward-flowing lines from the south pole of the magnet.

In superconductors, resistance disappearing is not the only intriguing phenomenon. The exclusion of magnetic fields, which is another manifestation of the Meissner effect, occurs as well. The forces on these currents tend to cancel, making the magnetic drag almost zero.

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Superconductivity, a state achieved at very low temperatures, allows magnets to have zero resistance and to expel all magnetic fields - a phenomenon known as the Meissner effect. In this state, a current persists without a needed voltage source. This property has practical applications such as in the technology used to levitate high-speed trains.

In order for magnets to have zero resistance, they have to achieve a state known as superconductivity. Superconductivity is a phenomenon that occurs in some materials when they are cooled to very low critical temperatures. In this state, there is a resistance of exactly zero and all magnetic fields are expelled. This lack of resistance means that, once a current is established in a superconductor, it persists without an applied voltage source.

This is closely linked to something known as the Meissner effect, whereby superconductors expel all magnetic field lines. This perfect diamagnetism means that the net magnetic field within a superconductor is always zero — any magnetic field lines that pass through a superconducting sample when it is in its normal state are expelled once the sample becomes superconducting.

The practical applications of these properties are considerable. For instance, high-speed trains have been developed that levitate on strong superconducting magnets, exploiting the fact that a light, permanent magnet placed over a superconducting sample will levitate in a stable position above the superconductor.

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Explanation:

Bond Enthalpy : It is defined as amount of energy required to break a the particular bond in there gaseous state. It is also known as bond energy. It units are kJ/mol.

If the average bond enthalpy for a C-H bond is 413 kJ/mol, When the C-H bond breaks in which energy will be required ,which will be an endothermic reaction.

Answer:

grating

Explanation:

Diffraction is a phenomenon in which light bends at the edges of an object because of which light falls even in the shadow region.

Diffraction grating consists of thousands of slits through which the light splits. The diffracted light travels in different directions and forms a alternate dark and bright fringes.

Answer;

density = (mass/volume)

here density varies with respect to change in volume by assuming constant volume.

changing the temperature, change in density. most matter increases in volume when it gets hotter. Example, when an iron rod is heated, it will get longer and its density will decrease. This happens because the mass of the rod constant, but volume increase.

It takes Earth about 24 hours to rotate once on its axis. The movement of one object around another object is called revolution. ... Earth's path as it revolves around the sun is called its orbit. Earth's orbit is a slightly elongated circle, or ellipse.

formed by the process of glaciation.

The mass of Block-B is DOUBLE the mass of Block-A.  (choice-a)

The mass of Block-B is twice the mass of Block-A and the mass of products = mass of reactants. This question asks us about the law of conservation of mass. Thus, option A is correct.

The law of conservation of mass states that matter can neither be created nor destroyed but can be transformed form one state or form to another. This is the basics of science which implies that whatever matter we have, it was created from something before it was converted into what we have at the moment.

However, this law does not hold nuclear reactions because they undergo changes in the core of the matter which can change the proton of that same matter or neutron from one element to another. This is to say that in nuclear reactions, matter can be created and it can also be destroyed.

Therefore, The answer to this problem is mass of products = mass of reactants and this question asks us about the law of conservation of mass. Thus, option A is correct.

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Since the whole cannon AND the lead cannonball inside it are starting out motionless, there's no momentum before the shot.  

We know that momentum is conserved, so the total momentum after the shot must also be zero.  This tells us that whatever momentum the ball carries away in THAT ===> direction, the cannon itself will have the same amount of momentum in THIS <=== direction.  That way, they'll add up to zero like we need them to.

The physics we need:  Momentum = (mass) x (velocity)

OK. All students hearing protection ready now.  Ready on the left.  Ready on the right.  Ready on the firing line.   Cannon discharge in three.  Two.  One.  ZERO.  BOOM !

-- 10 kg ball flying THAT way ==> at 200 m/s.

Momentum= (10kg)x(200 m/s THAT==>way = 2,000 kg-m/s THAT==>way

-- Cannon momentum = (1000 kg) x (velocity THIS <== way)

Cannon momentum = 2,000 kg-m/s THIS<==way

(1000 kg) x (velocity) = 2,000 kg-m/s this<==way

Divide each side by (1,000 kg):

Velocity = (2,000 kg-m/s) / (1,000 kg)  this<==way

Velocity of the cannon = 2 m/s this<==way

Thermal energy comes from moving particles

By making particles go faster, you increase the kinetic energy creating heat.

The answer is B because if you seen a movie you would see it happen

The change in the car engine's sound as it approaches the camera can be explained by the Doppler Effect. The sound will get louder, and the pitch will get higher.

This question pertains to the Doppler effect observed in sound waves. When a race car starts its engines, the sound of the car's engine roaring is heard at a certain pitch. As the car begins to move towards you, the source of the sound gets closer and the waves reach your ear more frequently. This translates into our perception as a higher pitch. So, the correct answer is B. The sound of the engine will get louder and pitch higher as the car approaches the camera.

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Jumping with more acceleration

Answer:

Explanation:

D) Jumping with greater initial velocity would increase the height of his jump.  

Answer: Land cools faster than water

Reason: Water has high specific heat capacity, so it absorbs huge amount of heat energy to increase comparatively small amount of temperature. Loosing a large amount of heat requires more time, so water takes more time to cool down.

Answer:

The net force is 392N, pointing down.

Explanation:

The net force is the sum of all forces acting on the rock, namely the gravity ("+" acting downward) and the friction force due to air resistance ("-" acting upward):

[tex]F_{net} = F_g - F_{air}\\F_{net} = m\cdot g - F_{air} = 50kg\cdot 9.8\frac{m}{s^2}-98N= (490-98)N=392N[/tex]

The net force is 392N and pointing down (positive)/

Answer:

Work done by the machine (W) =  500 × 1.5 = 750 J

Work supplied to the machine (W) = 100 × 10 = 1000 J

              Here, work supplied to the machine is input work = 1000 J

Answer: d, All of the above.

    It states that "Every object will remain at rest or uniform motion unless compelled to change its state by the action of an external force".  

 All the choices a, b, c and d are explaining the newtons I law and proving above statement.

An object with more mass has more kinetic energy than an object with less mass, if both objects are moving at the same speed. (c)

Answer:

c. at the same speed

Explanation:

i think it's Precambrian

Given data

mass (m) =8 Kg ,

speed (v) =10 m/s ,

time (t) = 5 s

determine magnitude of force (Fnet) = ?

                    we knoe that

                                        Fnet = m.a

                                                 = 8 × (v/t)       since a = v/t

                                                 = 8 × (10/5)

                                                 = 16 N

Magnitude of net force is 16 N

Figure 1

Speed is a scalar quantity, It has only magnitude but no direction. It is defined as rate of change of distance.

Mathematically,    speed = distance÷time

                                     S = d ÷ t

                                      S = 2560 ÷ 60

                                      S =  42.67 m/s.

Bits:

Speed is a scalar quantity, that describes only the magnitude (42.67 m/s) of the rate of change of an objects distance. Determine the objects speed requires a unit of distance per unit of time

Figure 2

Velocity is a vector quantity, It has both magnitude and direction. It is defined as rate of change of displacement.

Mathematically, Velocity = Displacement ÷  time

                                     V =  75 ÷ 1.5

                                     V = 50 Km/h.

Velocity is a Vector quantity that describes both the magnitude and direction  of the rate of change of objects displacement plus it describes its position. An objects overall change in position is known as  its Displacement  per unit time.