calculate the volume of sphere with radius 7 cm​

Answer:

An atom that loses one or more valence electrons to become a positively charged ion is known as a cation, while an atom that gains electrons and becomes negatively charged is known as an anion.

Explanation:

Atoms that lose electrons acquire a positive charge as a result because they are left with fewer negatively charged electrons to balance the positive charges of the protons in the nucleus.

Given what we know about the speed of light, we can confirm that a single ray of light would take 1.3 seconds to travel from the Moon to the Earth.

Therefore, since the Moon sits at a distance of 390 million meters from the Earth, and the fact that light travels at approximately 300 million meters per second, we can confirm that light from the moon takes roughly 1.3 seconds to reach Earth.

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Answer:

Find the dimension of each and every quantity in all the options to check whether they are the same or not. We can use any one formula of each identity to find its dimension.

Complete step by step solution:

To find the dimension of a quantity, we can use any formula related to that quantity but we will use the easiest ones to save time.

Force-

from Newton’s law of motion,

F=maF=ma

Dimension of force =[M][LT−2]=[MLT−2]=[M][LT−2]=[MLT−2]

Work done-

W=F×sW=F×s

Dimension of work=[MLT−2][L]=[ML2T−2]=[MLT−2][L]=[ML2T−2]

Momentum-

p=mvp=mv

Dimension of momentum=[M][LT1]=[MLT−1]=[M][LT1]=[MLT−1]

Impulse-

I=F×tI=F×t

Dimension of impulse=[MLT−2][T]=[

Answer:

m

Explanation:

Question:

A block of mass 1kg is placed on an inclined plane at an angle of 30° to the horizontal. Calculate the frictional force, normal reaction, the coefficient of the static friction​

Answer:

Break the mg force into components in the plane of the inclined plank. Now force acting parallel is mgsin37°. Perpendicular force is mgcos37° which is equal to normal force.  

Now calculate max value of friction force which is 0.8*mg cos37°. Since its greater than pulling force mgsin37°, the body will be at rest and acceleration is zero.  

Force applied by surface is vector sum of normal force and friction force acting.

Answer:

When the temperature drops from 0°C to 4°C, water expands instead of contracting, resulting in a reduction in density. In solid form, water molecules normally form open crystal structures, so as they freeze, their density decreases.

When liquids cool, they constrict and become denser. This is not the case with water. Upon cooling to 4°C, it contracts, but upon reaching 0°C, it begins to expand and becomes ice. Thus, it becomes denser as it cools.

Answer:

Its True

Explanation:

hope this helps

Answer:

Le due rette rappresentano le leggi del moto di due punti

materiali (per esempio due macchine) che si muovono di moto

rettilineo uniforme. La retta meno pendente (velocità più bassa)

è riferita alla macchina che parte da una posizione iniziale più

avanti rispetto alla seconda macchina. Però, la seconda

macchina, avendo una velocità maggiore della prima (retta più

pendente), nonostante parta più indietro rispetto alla prima, dopo

un certo tempo la raggiungerà. Pertanto, il punto P, intersezione

delle due rette, rappresenta la situazione fisica in cui la seconda

macchina raggiunge la prima. In particolare, le coordinate del

punto P (tempo e spazio), rappresentano l’istante e la posizione

in cui la seconda macchina raggiunge la prima.

Answer:

The object will move if forces are unbalanced

Answer:

acceleration = 3v 125 m/s^

final speed= 50 m/s

final speed in km/hr = 180 km/hr

Explanation:

A new model BMW can start from rest and travel 400 m in 16 s.then the acceleration during this time would be  1.5625 m/s²

There are three equations of motion given by  Newton

The first equation is given as follows

v = u + at

the second equation is given as follows

S = ut + 1/2×a×t²

the third equation is given as follows

v² - u² = 2×a×s

As given in the problem, A new model BMW can start from rest and travel 400 m in 16 s

distance covered by BMW  = 400meters

initial velocity(u) = 0 m/s

time = 16 seconds

acceleration(a) =? m/s²

By using the second equation of motion given by newton

S = ut + 1/2at²

S = 400 m ,u= 0 m/s , and t =16seconds

400  = 0 + a16²

a =400/256

a = 1.5625 m/s²

For the final speed of the car

v= u + at

v = 0 + 1.5625×16

v = 25 m/s

For calculating the speed in km /h

v = 25 ×3600/1000

 = 90 km/h

Thus, the acceleration during the first 16 s  time would be  1.5625 m/s²

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Answer:

150

Explanation:

15m/s×10s= 15m/a

and that is the correct answer

Hi there!

Distance and displacement are different.

Distance is WITHOUT direction (scalar quantity)

Displacement TAKES INTO ACCOUNT direction (vector quantity), and is RELATIVE to the initial point.

DISTANCE:

Add up each segment's position:

0 - 2 sec: 0 m

2 - 5 sec: 10 - 4 = 6 m

5 - 6 sec: 0 m

6 - 8 sec: 10 - 2 = 8 m

8 - 9 sec: 0 m

9 - 12 sec: 5 - 2 = 3 m

Add up:

6 + 8 + 3 = 17 m

DISPLACEMENT:

To find displacement, simply look at the position at the final point (t = 12 sec) and compare to the initial position:

At t = 12: Position = 5 m

At t = 0: Position = 4 m

5 - 4 = 1 m

Answer:b

Explanation: each cm is 10mm so 5cm is 50mm that is less than 500mm

Answer:

2,500 Joules (J) or Newton Meter (N M)

Explanation:

Work = Force x Distance

The force in this equation is 500 Newtons. The distance (displacement) is 5 meters. Plug it into the equation above.

Work = 5m x 500n

Work = 2,500 Joules or Newton-Meters.

Therefore 2,500 Joules or Newton Meters of work is done on an object.

Answer:

Strongest

Explanation:

100% correct

Answer:

The acceleration of an item is proportional to the net force exerted on it and inversely proportional to its mass. The acceleration of an item increases as the force pressing on it increases. The acceleration of an item decreases as the mass of the thing increases.

Answer:

F=ma

Explanation:  Let X stand for the new acceleration with the tripled force.

F = m*(12.0 m/s/s)

3F = m*(X)

3F = 3*m*(12.0 m/s/s)

3F = m*(X)

3F = m*(3*12.0 m/s/s)

X = (3*12.0 m/s/s)

a for 3X the force is = (3*12.0 m/s/s), or 36.0 m/s/s

The characteristics of the random error allow to find the result for the best value of the forces is:

In a measurement in physics some type of instrument is used, therefore all measurements have a precision due to the minimum amount that can be measured with the given instrument, the correct way to give the measurement is

     m = m ± Δm

Where m is the measure and Δm the error due to the appreciation of the instrument.

In the measurement process there are variables type that can affect the results, in general they can be divided into two groups:

Statistical methods can be applied to the random type of processes to reduce their effect on the final result, one of the most efficient way is to carry out the measurement several times and since the errors are random, if we obtain the average it must be closer to the true value.

       [tex]m_{average} = \frac{\sum m_i}{n}[/tex]  

Where m_i  is each measurement and n is the number of measurements.

As a result it is

        [tex]m = m_{average} \pm \sigma[/tex]

Where σ  is the standard deviation.

It indicates that three measurements were made of each force, suppose that their values ​​are: F₀₁, F₀₂ and F₀₃, and the best value is

       [tex]F_{o \ average} = \frac{1}{3} (F_{o1} + F_{o2} + F_{o3} )[/tex]

For the tension of the body also takes three measurements.

        [tex]F_{t \ averag} = \frac{1}{3} (F_{t1} + F_{t2} + F_{t3} )[/tex]

The best value of the net forces should be obtained using the average values.

        [tex]\Delta F = F_{t \ average} - F_{o \ average}[/tex]  

In conclusion using the characteristics of the random error we can find the result for the best value of the forces is:

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Answer:

dry ice, air fresheners, polar evaporation, arsenic treatment

Answer:

Hey there

A) wave A and B have the same speed.

When they return to the air they will have the same speed. Yes they did have different speeds in water and wood but now they are back in air ("AFTER they encountered different media").

They all search for planets by measuring properties of a star rather than of the planets themselves. ... The size of the Doppler shift that we detect depends on the tilt of a planet's orbit.

120m per minute

If you take 960 and divide it by 8 you get 120 then you have the answer 120m per minute

Answer:

Uwu

Explanation:

The best exercise for Alicia to add to her routine will be biking with occasional sprints. Thus, the correct option is A.

Anaerobic exercise is a type of exercise which involves breaking down of the glucose sugar in the body without using the oxygen gas. Anaerobic means without oxygen, the exercises which does not require oxygen. In practical terms, it means that anaerobic exercise is more intense exercise, however shorter in duration than that of aerobic exercise.

Alicia’s coach thinks that she should try some interval training so that she can get some anaerobic activity. The activity which should be added to her routine is biking with occasional sprints.

Therefore, the correct option is A.

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Answer:

mass = 25.5kg

Explanation:

The gravitational force equivalent, or, more commonly, g-force, is a measurement of the type of force per unit mass – typically acceleration – that causes a perception of weight, with a g-force of 1 g equal to the value of gravitational acceleration on Earth, g, of about 9.8 m/s².

Mass, m = [tex]\frac{Force}{acceleration due to gravity}[/tex]

[tex]mass,m=\frac{F}{g} = \frac{250}{9.8}= 25.5 kg[/tex]

Answer:

25.

Explanation:

5

because you're taking off the front number which is one

The distances traveled by the boy will be 4 m. Newton's second equation of motion is applied.

Distance is a numerical representation of the distance between two objects or locations.

The distance can refer to a physical length or an estimate based on other factors in physics or common use. |AB| is a symbol for the distance between two points A and B.

Given data;

acceleration(a)=2m/s²

Time (t)=2 s

u(Initial velocity)=0

The distance traveled by the boy will be;

[tex]\rm S=ut+\frac{1}{2} at^2 \\\\ \rm S=0+\frac{1}{2} (2)(2)^2 \\\\ S=4 \ m[/tex]

Hence, the distance traveled by the boy will be 4 m.

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Explanation:

v(speed)=10/120=0.08m/s

Answer:

0.08

Explanation:

10/120 = 0.08

I hope this helps!