Please help anyone knows the answer?!!!

Answer:

C. observations

Explanation:

a scientist have to observe somethng to find the answers or solve problems

Answer:

The substance is changing state from a gas to a liquid to a solid. As the temperature changes we also know that A

Explanation:

Answer:

Option A is correct.

Explanation:

In the given triangle , x is the base and 14 is the hypotenuse for angle 33°.

cos 33 = base / hypotenuse

Putting the given values

cos 33 = x / 14

.84 = x / 14

x = .84 x 14

= 11.7

Option A is correct.

Answer:

X = 12N

Explanation:

Anticlockwise moment = Clockwise moment

Taking the moment at the pivot,

Anticlockwise moment = X×2.0m

Clockwise moment = (2.0N × 4.0m) + (4.0N × 4.0m)

Hence, 2X = (8 + 16)

2X = 24

X = 12N.

I HOPE IT'S OK.

Answer:

By Lenz's law, for, coils, if he North pole is activated on the electromagnet, the pole on the side of the coil closest to the electromagnet will be a North pole and the flow of the current will be counter clockwise

Explanation:

Lenz's law states that where a changing magnetic field induces an electric current in a solenoid, the magnetic field that is produced by the coil opposes the initial activation of the electromagnet in the solenoid

By Flamings right hand rule, we have;

Therefore, by Lenz's law, for, coils, if he North pole is activated on the electromagnet, the pole on the side of the coil closest to the electromagnet will be a North pole and the flow of the current will be counter clockwise.

Explanation: The molecules are continually colliding with each other and with the walls of the container. When a molecule collides with the wall, they exert small force on the wall The pressure exerted by the gas is due to the sum of all these collision forces. The more particles that hit the walls, the higher the pressure.

hope it helps

Answer:

It is in contact with two vertical rails which are joined at the top. The rails are without friction and resistance. There is a horizontal uniform magnetic field of magnitude B perpendicular to the plane of the ring and the rails.

Explanation:

Not sure if this is correct but pls give thanks anyway!

Explanation:

The speed of the red car, relative to the blue car, is:

v = 75 m/s − 50 m/s

v = 25 m/s

Answer:

Hey there!

He starts from km 257.

Then he travels to km 133.

Finally, he travels to km 173.

His displacement is 257-173, or 84 km.

He traveled 164 km. (Note that distance traveled and displacement are not the same thing.)

Let me know if this helps :)

John's resultant displacement from the 257 km märker would be 84 kilometers .

He traveled a distance of 164 kilometers on the highway.

An object's position changes if it moves in relation to a reference frame, such as when a passenger moves to the back of an airplane or a professor moves to the right in relation to a whiteboard.

As given in the problem, Johın is traveling along a straight inter-state highway, he notices that the mile marker reads 257 km. John travels until he reaches the 133 km marker and then retraces his path to the 173 km marker.

The total displacement of the John = 257 - 173

                                                     = 84 kilometers

the total distance traveled by John = (257-133) + (173-133)

                                                          = 164 kilometes

Thus, John's resultant displacement from the 257 km märker would be 84 kilometers.

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Answer:

[tex] I = \frac{mgd}{4\pi^{2}f^{2}} [/tex]

Explanation:

The moment of inertia (I) of the pendulum can be found using the following equation:

[tex] T = 2\pi\sqrt{\frac{I}{mgd}} [/tex]    

Where:

T: is the period of the pendulum

m: is the pendulum's mass

g: is the gravity

d: is the distance of the pivot from the center of mass

Solving the above equation for I:

[tex]  I = \frac{T^{2}*mgd}{(2\pi)^{2}} [/tex]     (1)

We have that the pendulum moves in simple harmonic motion with a frequency f, and this f is equal to:

[tex] f = \frac{1}{T} \rightarrow T = \frac{1}{f} [/tex]

By entering T into equation (1) we have:

[tex] I = \frac{T^{2}*mgd}{(2\pi)^{2}} [/tex]

[tex] I = \frac{(1/f)^{2}*mgd}{(2\pi)^{2}} [/tex]  

[tex] I = \frac{mgd}{4\pi^{2}f^{2}} [/tex]

Therefore, the moment of inertia of the pendulum about the pivot point is [tex] I = \frac{mgd}{4\pi^{2}f^{2}} [/tex].

I hope it helps you!  

Answer:

1.33

Explanation:

Apparent Depth = 1.0m

Real Depth = x

Refractive Index = 1.33

n = r.d/a.d

1.33 = x/1

x = 1.33 x 1

1.33

Answer:

Volume, [tex]V=23.8\ cm^3[/tex]

Explanation:

It is given that,

Mass of small object of brass, m = 200 g

The density of brass is 8.4 g/cm³

We need to find the volume of the brass object. Density is equal to mass of an object per unit its volume.

So,

[tex]d=\dfrac{m}{V}[/tex]

V is the volume of the brass object

[tex]V=\dfrac{m}{d}\\\\V=\dfrac{200\ g}{8.4\ g/cm^3}\\\\V=23.8\ cm^3[/tex]

So, the volume of the brass object is [tex]23.8\ cm^3[/tex].

The volume of the brass object is 23.81 cm³.

Density is the ratio of the mass of a body and its volume. The S.I unit is kg/m³

To calculate the volume of the brass, we make use of the formula below

D = m/V................. Equation 1

Where D = density of the brass object, m = mass of the brass object, V = volume of the brass object.

make V the subject of equation 1

V = m/D.............. Equation 2

From the question,

Given: m = 200 g, D = 8.4 g/cm³

Substitute these values into equation 2

V = 200/8.4

V = 23.81 cm³

Hence, The volume of the brass object is 23.81 cm³

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Answer:

The correct option is C

Explanation:

Emperical data is a data that is collected or recorded during the course of an experiment by means of observation. In the case of the question, all the birds that came to the park were said to have had there feather colors and beak shapes recorded during the course of a student's observation.

Answer:

A qualitive

Explanation:

i think "Barsaman Pun"

Explanation:

BARSAMAN PUN IS THE CURRENT ELECTRIC MINISTER OF NEPAL.

Answer:

The independent variable: is the amount of compost applied to each plant

The dependent variable: the height of the plants

Hypothesis: Older grass compost will produce taller plants

Three groups were created:

the control group is group C to which no compost was applied

investigated group A and B with different amounts of compost applied

Explanation:

The students are considering using the scientific method to analyze the problem.

The independent variable is the one controlled by the researcher and the dependent variable is the response of the system

The independent variable: is the amount of compost applied to each plant

The dependent variable: the height of the plants

Hypothesis: Older grass compost will produce taller plants

Three groups were created:

the control group is group C to which no compost was applied

investigated group A and B with different amounts of compost applied

Answer:

Explanation:

THE SPEED OF AN OBJECT IN A PARTICULAR DIRECTION IS THE OBJECT'S VELOCITY.

[tex]hope \: this \: helps[/tex]

Answer:

acceleration

Explanation:

Answer:

YES

Explanation:

An echo may be defined as a sound which is repeated because of the sound waves that are produced are reflected back after striking a surface. Sound waves can smoothly bounce off the hard objects in the same manner as a rubber ball bounces back the ground.

When a sound wave strikes a hard surface, the sound waves gets reflected back and bounces back to the observer and produces an echo. If the sound waves strikes a soft surface it absorbs the sound.

Although the direction of a sound changes but the echo sounds in the same way as the original sound.

Answer:

25 N

Explanation:

Force : This is defined as the product of mass and acceleration. The unit of force is Newton or kgm/s².

From the question,

F = ma......................... Equation 1

Where F = Force of the brake, m = mass of the break, a = acceleration.

But,

a = v/t.................. Equation 2

where v = velocity, t = time.

Substitute equation 2 into equation equation 1

F = m(v/t)................ Equation 3

Given: m = 5.0 kg, v = 10 m/s, t = 2 seconds

F = 5(10/2)

F = 25 N.

Hence the average force of the brakes on the bike is 25 N

Answer:

The average force of the brakes on the bike is 25.0 N

Explanation:

The parameters given in the question are,

Mass, m = 5.0kg

Initial velocity, u = 10 m/s

Time, t = 2 sec

Since the bike came to a complete stop, then

Final velocity, v = 0 m/s

To determine the average force of the brakes on the bike; From Newton's second law of motion, Force is given as

F = ma

Where F is the force in N (Newtons)

m is the mass in kg

and a is acceleration in m/s²

Hence, we will first determine the acceleration.

From one of the equations of kinematics for linear motion,

[tex]v = u + at[/tex]

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

Putting the given parameters into the above equation, we get

[tex]a = \frac{0 - 10}{2}[/tex]

[tex]a = \frac{-10}{2}\\ a = - 5[/tex]m/s²

The negative sign indicates deceleration since the bike came to a stop,

Hence, [tex]a = 5[/tex] m/s²

From,

F = ma

F = 5.0 × 5

F = 25.0 N

Answer:

The kinetic energy for both objects is the same.

Explanation:

While in other cases the kinetic energies of two objects that have different masses might be different depending on their velocities, in this case both the 3 kg book and 5 kg bowling ball have the same kinetic energy.

This is because kinetic energy is calculated using the formula: K = 1/2 * m * v^2, where m represents the mass and v represents the velocity of the object.

Since the book and the bowling ball are sitting still on the floor, their velocities are zero.  Hence, when we plug in 0 for velocity into the equation for kinetic energy, we will get that the kinetic energy is 0 for the book and the bowling ball.

Hope this helps!

Answer:

Let's define the North as the positive y-axis.

At t = 0s (t is the variable of time) we know that Raul is 30m at the South, so in our system, the position of Raul at t = 0s is:

p(0s) = -30m

After 5 seconds, at the time t = 5s, we know that the position of Raul is 20m at the North, so now the position is:

p(5s) = 20m.

a) First, speed is calculated as distance over time, or:

S = ( p(5s) - p(0s))/5s = (20m - (-30m))/5s = 50m/5s = 10m/s.

b) The displacement is defined as the difference between the final position and the initial position:

Displacement = p(5s) - p(0s) = 20m - (-30m) = 50m.

Now, knowing the speed is 10m/s, we can write the movement equation as:

p(t) = 10m/s*t + p(0s) = 10m/s*t - 30m

So the displacement at a time t is:

D = p(t) - p0s = 10m/s*t - 30m - (-30m) = 10m/s*t

c) the position one minute after he started will be:

p(1min)

But we have our equation in seconds, so we write 1min = 60s

p(60s) = 10m/s*60s - 30m = 600m - 30m = 570m

Answer:

Explanation:

1 cm =10mm so 800cm is equal to 8000mm.so b is the correct answer

Answer:

we use the formula,

[tex]v {}^{2} = u {}^{2} + 2gh[/tex]

[tex]89 {}^{2} = 76 {}^{2} + 2(10)h[/tex]

[tex]h = (89 {}^{2} - 76 {}^{2} ) \div 20[/tex]

h= 107 m

Answer:24/225

Explanation:density =mass/volume

Answer:

B = 5.3x10⁻¹⁷ T

Explanation:

The magnetic field can be calculated as follows:

[tex]B = \frac{\mu_{0}I}{2\pi R}[/tex]

Where:

μ₀: is the magnetic permeability = 4πₓ10⁻⁷ H/m

I: is the current          

R: is the distance between the magnetic field and the beam = 1.5 m

The current is:

[tex] I = 2.5 \cdot 10^{9} p/s*1.6 \cdot 10^{-19} C/p = 4.0 \cdot 10^{-10} A [/tex]

Hence, the magnetic field is:            

[tex]B = \frac{\mu_{0}I}{2\pi R} = \frac{4\pi \cdot 10^{-7} H/m*4.0 \cdot 10^{-10} A}{2\pi*1.5 m} = 5.3 \cdot 10^{-17} T[/tex]

Therefore, the magnetic field is 5.3x10⁻¹⁷ T.

I hope it helps you!  

The magnetic field will be "[tex]5.3\times 10^{-17} \ T[/tex]".

According to the question,

Magnetic permeability, [tex]\mu_0 = 4 \pi\times 10^{-7} \ H/m[/tex]

Distance between magnetic field and beam, R = 1.5 m

The current (I) will be:

= [tex]2.5\times 10^9\times 1.6\times 10^{-19}[/tex]

= [tex]4.0\times 10^{-10} \ A[/tex]

hence,

The magnetic field (B) be:

= [tex]\frac{\mu_0 I}{2 \pi R}[/tex]

By substituting the values,

= [tex]\frac{4 \pi\times 10^{-7}\times 4.0\times 10^{-10}}{2 \pi\times 1.5}[/tex]

= [tex]5.3\times 10^{-17} \ T[/tex]

Thus the response above is appropriate.

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Answer:

option C is correct

Explanation:

given mass=5 kg  

velocity=20 m/s

momentum,P=m v

p=5*20=100 kg m/s

The momentum of the object is 100kg.m/s

HOW TO CALCULATE MOMENTUM:

Momentum (p) = mass (m) × velocity (v)

p = 20m/s × 5kg

p = 100 kg.m/s

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Answer: D. 0.5

Explanation:

The slope formula is y2-y1/x2-x1.

2-(-1)/4-(-2) = 2+1/4+2

2+1/4+2 = 3/6 = 1/2

1/2 = 0.5

The slope is 1/2, or 0.5.

Answer:

the answer is 0.7

Explanation:

because in this this case he asked nearest millimeter so the anwer can be qualified as 0.7 you can covert this into cos tita

A 0.7 m

A meter ruler is a gadget or a sort of ruler that is used to measure the length and distance of various objects.

A meter rule has a length of one meter, which is equal to one hundred centimeters, as the name suggests.

According to the questions,

On a metric ruler, each individual line represents a millimeter (mm). The numbers on the ruler represent centimeters (cm). There are 10 millimeters for each centimeter. To read a metric ruler, each individual line represents .

As 0.7m = 70cm =700mm

Meter ruler can measure up to 100 cm. As the meter ruler is of 1m.

A metre ruler has a length of one metre, which is equal to one hundred centimetres, as the name suggests. A metre rule, on the other hand, is divided into smaller units called millimetres, with each centimetre divided into ten millimetres.

A metre rule, on the other hand, is divided into smaller units called millimetres, with each centimetre divided into ten millimetres.

As a result, up to one millimetre, a metre rule can be used to measure the shortest length.

A metre rule can be used for more than just measuring distances; it can also be used to draw straight lines and cut blades.

Therefore,

0.7m reading is shown to the nearest millimeter.

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