please help answer worth 15!!

Answer:

  D.  No, because the student needs to know the direction that the force is applied

Explanation:

The change in momentum depends on the direction of the force as well as its magnitude. Since the graph only supplies force magnitude information, it is insufficient to allow the student to calculate the change in momentum.

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:  It is important to study Earth because it is the one place in the entire solar system where humans can live.  Earth is a planet too! The advantage is Earth science or geoscience includes all fields of natural science related to planet Earth. This is a branch of science dealing with the physical and chemical .

quote explanation: I hope that was helpful and please mark me as brainliest!

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:

0 J

Explanation:

Work is the product of force and distance in the direction of force.

The formula is ; Work = Force * Distance

Given that :

Force = 400 N

Distance = 0 meters

Work = 400 * 0 = 0 J

No work was done because the boulder did not move.

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:

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:

Difficult to Pour.

Explanation:

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:

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

Answer:

it's answer is B

A planet is round because of gravity. A planet's gravity pulls equally from all sides. Gravity pulls from the centre to the edges like the spokes of a bicycle wheel. This makes the overall shape of a planet a sphere, which is a three -dimensional circle

Hope it helps you

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:

Hydrogen

Explanation:

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

Answer:

500km

Explanation:

Given parameters:

Speed  = 200km/hr

Time taken  = 2.5hrs

Unknown:

Distance  = ?

Solution:

To solve this problem, we use the speed, time and distance equation.

   Therefore;

  Distance  = Speed x time

So;

  Distance  = 200 x 2.5  = 500km

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.

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Answer:

The weight of the lunar research module on Earth is 150.000 N

Explanation:

The given parameters for the mass of the lunar module are;

The mass of the lunar moon, m = 15.000 kg

The gravitational field strength of the Earth, g = 10 N/kg

The weight, 'W', of the lunar research module on Earth is given as follows;

W = m·g

Substituting the known values, we get;

W = 15.000 kg × 10 N/kg = 150.000 N

The weight of the lunar research module on Earth, W = 150.000 N.

Answer:

30km

Explanation:

Distance= speed x time

15x2=30km

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:

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.

Answer:

it change speed

Explanation:

its because when light passes through one medium to another (rarer to denser)its velocity change and its speed also changes

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:

point of support on which a lever rotates.

Explanation:

The fulcrum is the point of support on which a lever rotates. Fulcrum is a pivotal part of simple machines.

The fulcrum provides the platform for a lever to torque.

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

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:

I believe its called the crest

Explanation:

Answer:

crest

Explanation:

the highest surface is called crest. the lowest is the trough. the vertical distance between the crest and trough is the wave height. the horizontal distance between two adjacent crests or troughs is known as the wavelength.

Answer: The potential energy of the weights is 24,500 J

Explanation:

For an object of mass M, that is at a distance H from the ground, the potential energy can be written as:

U = M*H*g

where g is the gravitational acceleration g = 9.8m/s^2

In this case, we have that:

mass of the weights = 1,250 kg

height = 2m

Then the potential energy of the weights is:

U = 2m*1,250kg*9.8m/s^2 = 24,500 J

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.

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Answer: The answer in scientific notation with the unit included is (1 × 10^-3m.)

Explanation:

In the field of physics, when working with too large or too small numbers, such can be expressed with the use of scientific notation. This helps to eliminate huge or ambiguous numbers with significant units. It is written is such a way that the first number is greater than or equal to 1 and less than 10 which is then multiplied by a factor of 10.

Units are symbols that are used to represent a measurement For example the unit of meters is (m).

Converting 1mm to m:

1000millimeters = 1meter

1 millimetre = X

Making X the subject of formula,

X = 1 ×1 /1000

X = 0.001m

Therefore expressing X in scientific notation is

1 × 10^-3meter (m)