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This website is very helpful…..Is there chemistry and biology website like this…plz tell me….

Consider a stationary box at height x. The block is lifted by a student such that it comes to a rest at higher height y.

Consider the following discussion between two students:

Student 1: I exert an upward force on the box, which moves upward, so I do positive work on the box. The Earth exerts a downward force, so it does negative work on the box. The box begins and ends at rest, so its kinetic energy hasn’t changed. That means that the net work on the box is zero, so the work on the box by my hand and the work on the box by the Earth must have the same absolute value.

Student 2: But the box has moved upward, so its potential energy has increased. That means that the net work on the block must be positive, so the work on the box by your hand must be greater than the work on the box by the Earth.

What can you say about the reasoning given by the two students?

1. They are both incorrect.

2. Student 2 is correct and student 1 is incorrect.

3. They are both correct.

4. Student 1 is correct and student 2 is incorrect.

why is the answer 4

student 2 is incorrect as they say that the work done on the box by the hand must be greater than the work done on the box by gravity, which, if it was true, would mean that the box is accelerating. Student 1 however says that the work done on the box must be zero, and have the same value.

idk just guessing

yes thats the reason

no

volume of ten steel balls =50-20=30

volume of a steel ball=30/10=3 cm^3

mass of a steel ball=27 g

density=mass/volume=27g/3cm^3=9g/cm^3

Thank you very much

I was also thinking about it when he incorrected it

I also have a question.

Which of these have a greater refractive index and why?

A) water

B)ice

1)water, since it has more density

2) ice, since it has more density

3) water, since it has less density

4) ice, since it has less density

water since it has more density

so what should i do

1. Ten identical steel balls, each of mass 27 g, are immersed in a measuring cylinder containing 20 cm3cm3 of water.

The reading of the water level rises to 50 cm3 .

What is the density of the steel?

a)8.1 g/cm3

b)13.5 g/cm3

c)9.0 g/cm3[correct]

d)0.90 g/cm3

The volume of the ten steel balls is 50 – 20 = 30 . Density is calculated using Density= mass/volume.

Can someone explain to me why c is correct?

But I think d is correct.

Each of the steel balls is 27 g.

The total mass will be 27 x 10 = 270 g.

THNX.: )

Dont we use 270g for calculating the density

ံCorrect answer is (d).

Coz

Mass of steel ball =27g

Volume of steel ball = 50cm^3- 20cm^3 =30cm^3

Density of steel ball = mass /volume

rho = 27g/30cm^3=0.9gcm^-3.

(By Archimedes’ principle,

volume of body = volume of the liquid displaced by the body.)

Density=mass/volume

Volume of 10 metal balls =volume of the water that rose

=50-20

=30cm^3

Mass of 10 steel balls=mass of 1 steel ball ×10

=27×10

=270gm

Density=mass/volume

=270/30

=9gm/cm^3

good way to test your ability

oh wait I get it!! Sorry! 😛 My bad!

There is a problem with these tests….. I tick the correct answers but when they show the result, all the answers that I ticked are shown wrong. I mean, they do not check correctly what I ticked. e.g if I ticked the answer c, which is correct, then instead of giving me marks, they think I ticked something else for example d and them tell me the correct answer is c which I eventually did tick.!!!! I AM CONFUSED!

The answer that you chose is shown in blue, while the correct answer is shown as a tick. If you have chose a wrong answer, it is shown as a cross beside the blue answer.

Uhh… no you didnt get the point. Is there any way I could send a screenshot?

maybe u have been mistaken nothings like that