Two boys, Shrijan having weight 600N and Shrijesh having weight
300N are playing see-saw. If Shrijan is sitting at 2m from fulcrum,
where should Shrijesh sit from fulcrum to balance Shrijan? ​

Answer:

The extension of the spring is 7.35 cm

Explanation:

Spring Force

When a spring is compressed or extended by a distance x, it exerts a force given by the Hooke's Law:

F=k.x

Where k is the constant of the spring.

A mass of m=75 gr is hung to the spring of constant k=10 N/m. The force applied to the spring is the weight of the mass:

W = mg

The mass must be converted to kg:

m = 75/1000 = 0.075 kg

W=0.075*9.8

W = 0.735 N

The extension of the spring can be computed by solving for x:

[tex]\displaystyle x=\frac{0.735}{10}[/tex]

x=0.0735 m

x = 7.35 cm

The extension of the spring is 7.35 cm

Answer:

I don't think so

Explanation:

Answer:

yes

Explanation:

Answer:

Acceleration = 1.33m/s² East

Explanation:

Given the following data;

Initial velocity = 10m/s

Final velocity = 50m/s

Time = 30secs

To find the acceleration;

In physics, acceleration can be defined as the rate of change of the velocity of an object with respect to time.

This simply means that, acceleration is given by the subtraction of initial velocity from the final velocity all over time.

Hence, if we subtract the initial velocity from the final velocity and divide that by the time, we can calculate an object’s acceleration.

Mathematically, acceleration is given by the equation;

[tex]Acceleration (a) = \frac{final \; velocity - initial \; velocity}{time}[/tex]

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

Where,

a is acceleration measured in [tex]ms^{-2}[/tex]

v and u is final and initial velocity respectively, measured in [tex]ms^{-1}[/tex]

t is time measured in seconds.

Substituting into the equation, we have;

[tex]a = \frac{50 - 10}{30}[/tex]

[tex]a = \frac{40}{30}[/tex]

Acceleration = 1.33m/s² East

Answer:

Hydrogen

Explanation:

The atomic number is the number of protons in the nucleus :)

The force does the racket exert on the ball will be 18 N. Force is defined as the product of mass and acceleration. Its unit is Newton.

Force is defined as the push or pull applied to the body. Sometimes it is used to change the shape, size, and direction of the body.

The given data in the problem is;

The mass of tennis ball is, [tex]\rm m= 0.060 \ kg[/tex]

The speed of tennis ball is,[tex]\rm u = 25m/s[/tex]

The rebound's speed is,[tex]\rm v = 40 \ m/sec[/tex]

The time period of ball is in contact,[tex]\rm t=50 \ ms =50 \times 10^{-3} \ sec[/tex]

The force on the rocket is found as;

[tex]\rm F= m [\frac{v-u}{t}] \\\\\ \rm F= 0.060[ \frac{40-25}{50 \times 10^{-3}} ]\\\\\ F= 18 \ N[/tex]

Hence, the force does the racket exert on the ball will be 18 N.

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Answer:

Acceleration, a = 2.38m/s²

Explanation:

Given the following data;

Mass = 1.01 kg

Force = 2.4N

To find the acceleration;

Force is given by the multiplication of mass and acceleration.

Mathematically, Force is;

[tex] F = ma[/tex]

Where;

Making acceleration (a) the subject, we have;

[tex]Acceleration, a = \frac{F}{m}[/tex]

Substituting into the equation, we have;

[tex]Acceleration, a = \frac{2.4}{1.01}[/tex]

Acceleration, a = 2.38m/s²

Therefore, the magnitude of the acceleration of the ball at the time of the crash is 2.38 meters per seconds square.

Answer:Each method of dating has constraints around its use and effectiveness. Not all methods are well-suited for each situation – and sometimes it is just not possible to use a particular dating method.

Examples of some of the constraints of using a dating method include:

the size of the sample

the type of sample

contamination of the sample

the type of associated geo-archaeological materials

the need to minimise destructive testing

the chronologies involved

Explanation:

Answer:

A

Explanation:

marijuana affects the brain

In this case, they may be under-performing at school. Hence, option (A) is correct.

Routines that are routinely carried out are referred to as habits. They can also be characterized as behaviors brought on by an internal or external stimulus (Robbins & Costa, 2017). Additionally, habits are the actions you take in specific situations.

Perhaps someone else always brushes their teeth before going to bed. Basically, anything that is repeated frequently enough to become automatic might be considered a habit. You don't really need to consider doing it any more. It simply occurs.

Some would argue that our behaviors are what causes life (or at the very least, success). The routine actions we take shape who we are and the outcomes we attain. Because of this, developing healthy habits and breaking negative ones is a vital life skill that has numerous advantages.

Learn more about habits here:

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Answer:

B . 68.7 N

Explanation:

Given in the question that;

Force = 22 N

Mass = 7.0 kg

Velocity = 4.0 m/s

Gravitational force is the weight of wooden block , calculated as mass times acceleration due to gravity.

F= m* a

F= 7 * 9.81

F= 68.67 N

F= 68.7 N

Answer:

D.) Object 1 has 4x the kinetic energy of object 2

Explanation:

Kinetic Energy

Is the type of energy an object has due to its state of motion. It is proportional to the square of the speed.

The formula for the kinetic energy is:

[tex]\displaystyle K=\frac{1}{2}mv^2[/tex]

Where:

m = mass of the object

v = speed at which the object moves

Now suppose we have two objects with the same mass m1=m2=m and object 1 moves twice as fast as object 2, that is:

[tex]v_1=2v_2[/tex]

Let's compute their kinetic energies:

[tex]\displaystyle K_1=\frac{1}{2}mv_1^2[/tex]

[tex]\displaystyle K_2=\frac{1}{2}mv_2^2[/tex]

Since v1=2v2, the first kinetic energy is:

[tex]\displaystyle K_1=\frac{1}{2}m(2v_2)^2[/tex]

[tex]\displaystyle K_1=4\frac{1}{2}m(v_2)^2[/tex]

Dividing both equations:

[tex]\displaystyle \frac{K_1}{K_2}=\frac{4\frac{1}{2}m(v_2)^2 }{\frac{1}{2}m(v_2)^2}[/tex]

Simplifying:

[tex]\displaystyle \frac{K_1}{K_2}=4[/tex]

Or, equivalently:

[tex]K_1=4K_2[/tex]

Answer:

D.) Object 1 has 4x the kinetic energy of object 2

Answer:

150,000 Joules.

Explanation:

Given that a 50.0 kg shell is fired from a cannon on Earth's surface to a maximum height of 400 m. It then falls to a height of 100 m. What is the loss of potential energy as it falls?

From Potential energy formula,

P.D = mgh

Assuming g = 10m/s^2

P.D = 50 × 10 × 400

P.D = 200000 Joules

Then it fell on 100m

The potential energy will be

P.D = 50 × 10 × 100

P.D = 50000 Joules

The lost Potential energy will be:

Lost P.D = 200000 - 50000

Lost P.D = 150000 Joules

Therefore, the loss of potential energy as it falls will be 150,000 Joules.

Answer:

The absorption of water and minerals by taproot is more efficient with the taproot system. Fibrous root absorbs water more efficiently as it reaches deep into the soil. Taproots are capable of withstanding drought.

Answer: The new gas pressure is 150 kPa.

Explanation :

Boyle's Law: This law states that pressure is inversely proportional to the volume of the gas at constant temperature and number of moles.

[tex]P\propto \frac{1}{V}[/tex]     (At constant temperature and number of moles)

[tex]P_1V_1=P_2V_2[/tex]  

where,

[tex]P_1[/tex] = initial pressure of gas  = (100+200) kPa = 300 kPa

[tex]P_2[/tex] = final pressure of gas  = ?

[tex]V_1[/tex] = initial volume of gas  = v

[tex]V_2[/tex] = final volume of gas  = 2v

[tex]300\times v=P_2\times 2v[/tex]  

[tex]P_2=150kPa[/tex]

Therefore, the new gas pressure is 150 kPa.

Answer:

visible rock fragments

Explanation:

sedimentary rocks start as sediments carried in rivers and deposited in lakes and oceans then get buried so the sediments lose water and become cemented to form the rock.

Answer:

c

Explanation:

Answer:

According to our principle, when an object is slowing down, the acceleration is in the opposite direction as the velocity. Thus, this object has a negative acceleration. In Example D, the object is moving in the negative direction (i.e., has a negative velocity) and is speeding up.

Given that,

Initial velocity of the airplane = 66 m/s

Distance = 560 m

Final velocity of the airplane = 0 (stops)

To find,

Acceleration of the airplane.

Solution,

Let us consider that a is the acceleration of the airplane. We can find it using third equation of motion as follows :

[tex]v^2-u^2=2as\\\\a=\dfrac{v^2-u^2}{2s}\\\\a=\dfrac{0^2-66^2}{2(560)}\\\\a=-3.9\ m/s^2[/tex]

Therefore, the acceleration of the airplane is [tex]-3.9\ m/s^2[/tex]

Answer: It is correct to say iron is heavier than the wood.

Explanation:

It's because the density of iron is more than wood. What is this mean is iron the space between iron molecules in iron much less than as that of wood. So in iron there is more molecules than wood in same volume. More molecules means more mass, that's why iron is much heavier than wood for same volume.

Answer:

d is the correct answer for this question hope it helps

Explanation:

when you see a A in a circle the the ammeter

Answer:

D.

Explanation:

PLATO

Answer:

82.01m

Explanation:

Using the formula:

R^2=A^2+B^2

R= √ A^2+B^2

Where R= displacement

A=50m

B=65m

R= √ 50^2+65^2

R= √ 2500+4225

R= √ 6725

R=82.01m

The substance with a boiling point of 220°C and a melting point of -120°C will be liquid at room temperature. The room temperature ranges from 15-35°C.

The state of matter is the behavior of atoms and molecules present in a substance at a particular condition. There are three states of matter which include:

a. Solids: These are relatively rigid with a definite volume and shape, the atoms and molecules are attached to each other and vibrate in place,

b. Liquids: These are fluid in nature with a definite volume but not a definite shape, atoms and molecules are attached to each other by chemical bonds, and have more energy than solids,

c. Gases: In this state molecules do not have a definite shape nor a definite volume, the molecules are unstable as they carry maximum energy.

Boiling point of a substance is the temperature at which the vapor pressure of the liquid becomes equal to the pressure of surrounding (atmospheric pressure) of the liquid and the liquid therefore changes into the vapor state.

The process by which a solid substance changes to a liquid substance is called melting. The melting point is the temperature at which melting of a solid into a liquid takes place. The melting point of a substance is the same as the freezing point.

Learn more about Matter here:

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Answer:

Shape of the object

Explanation:

This depends on the shape of the object. For a spherical object, a unitless value of 0.47 is typical. The magnitude of the velocity squared. The faster you go, the greater the air resistance force

Strategies currently being implemented include:

Vapor recovery nozzles at the gasoline pumps to reduce refueling emissions;

Cleaner burning gasoline reformulated to reduce VOC, NOx and other pollutants;

Strict NOx emission limits for power plants and industrial combustion sources;

Enhanced vehicle inspection programs in states; and

Strict limitations on the solvent usage in factories.

hope this helps

Answer:

30×6=n

Explanation:

30 students in her class× 6 = number of students in the entire 4th grade.

Answer:

12.5

Explanation:

If the half life is 25 days then in 50 days it will half twice

50/2=25

25/2=12.5

Explanation:

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Calculus 1 : How to find acceleration

Study concepts, example questions & explanations for Calculus 1

Example Questions

Calculus 1 Help » Spatial Calculus » Acceleration » How to find acceleration

Find Acceleration : Example Question #1

The position vector of an object moving in a plane is given by r(t)=3t4i + 6t2j. Find its acceleration when t=1.

Possible Answers:

3i + 2j

36i + 12j

3i + 6j

6i + 2j

36i - 12j

Correct answer: 36i + 12j

Explanation:

To find acceleration at time t, we have to differentiate the position vector twice.

Differentiating the first time gives the velocity:

v(t) = r'(t) = 12t3i + 12tj

Differentiating a second time gives the accelaration:

a(t) = r''(t) = 36t2i + 12j

Plug in t=1 to solve for the final answer:

a(1) = r''(1) = 36i + 12j

Explanation:

Given

mass (m) = 1000 kg

Force (F) = 4000 N

Acceleration (a) = ?

We have the relation

F = m * a

or, 4000 = 1000 * a

or a = 4000 / 1000

a = 4 m/s²

The acceleration of the automobile is 4 m/s²

Hope it will help :)❤

Answer:

[tex]\boxed {\boxed {\sf 4 \ m/s^2}}[/tex]

Explanation:

According to Newton's Second Law of Motion, force is equal to the product of mass and acceleration.

[tex]F=m*a[/tex]

We know the mass is 1000 kilograms and the force is 4000 Newtons. Let's convert the units to simplify the question for later.

[tex]m= 1000 \ kg \\F= 4000 \ kg*m/s^2[/tex]

Substitute the values into the formula.

[tex]4000 \ kg*m/s^2=1000 \ kg *a[/tex]

We want to find the acceleration, a. We must isolate the variable on one side of the equation.

1000 kg and a are being multiplied. The inverse operatio of multiplication is division. Divide both sides of the equation by 1000 kg.

[tex]\frac{4000 \ kg*m/s^2 }{1000 \ kg } =\frac{1000 \ kg*a}{1000 \ kg}[/tex]

The kilograms will cancel.

[tex]\frac{4000 \ m/s^2 }{1000 }=a[/tex]

[tex]4 \ m/s^2 =a[/tex]

The autombile's acceleration is 4 meters per square second.