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3 years ago

PLZ WHAT I DOO I BROKE A WINDOW WHAT I DO

1 answer:

3 0

Hmmmm, you either tell your parent, try to fix it, or blame it on the dog with a baseball bat that always comes on your yard and tries to eat you.

o(*￣▽￣*)ブ

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Table 1 contains data about two completely ionised samples of pure boron.

WITCHER [35]

Answer:

I think it would most likely be 2... but not so sureee

7 0

3 years ago

A beaker of mass 1.3 kg containing 2.8 kg of water rests on a scale. A 3.7 kg block of a metallic alloy of density 4600 kg/m3 is

Oksana_A [137]

1) Force read on the upper scale: 33.4 N

2) Force read on the lower scale: 43.0 N

Explanation:

The reading on the upper scale is equal to the net force acting on the block of metallic alloy. The net force is given by:

$F=W-B$ (1)

where

W is the weight of the block (downward)

B is the buoyant force (upward)

The weight of the block is given by

$W=mg$

where m = 3.7 kg is the mass of the block and $g=9.8 m/s^2$ is the acceleration of gravity.

The buoyant force is given by

$B=\rho_w V g$

where

$\rho_w=1000 kg/m^3$ is the water density

V is the volume of the block

The volume of the block can be written as

$V=\frac{m}{\rho_b}$

where $\rho_b=4600 kg/m^3$ is the density of the block.

Substituting everything into eq.(1), we find:

$F=mg-\rho_w \frac{m}{\rho_b}g=(3.7)(9.8)-(1000)\frac{1.3}{4600}(9.8)=33.4 N$

Here we want to find the force on the lower scale.

The force on the lower scale is equal to the difference between the total weight of the system (given by the weight of the beaker + the weight of the water + the weight of the block) and the upper net force exerted on the upper scale, therefore:

$F' = m_B g + m_wg+m_b g - F$

where:

$m_B=1.3 kg$ is the mass of the beaker

$m_w=2.8 kg$ is the mass of the water

$m_b = 3.7 kg$ is the mass of the block

$F=33.4 N$ is the upper net force

Substituting and solving, we find:

$F'=(1.3+2.8+3.7)(9.8)-33.4=43.0 N$

Learn more about forces and weight:

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#LearnwithBrainly

6 0

3 years ago

Describe the structure of an atom

kvv77 [185]

The structure of an atom is in the middle of an atom has the neutron (nucleus) which has no charge around the neutron is the protons which has a positive charge and the ones that orbit around the atom is the electrons which has a negative charge in it. The number of protons is call the Atomic Number. Protons have a relative charge of +1 and the electron have a relative charge of -1.

4 0

3 years ago

A student must determine how the mass of a block affects the period of oscillation when the block is attached to a vertical spri

zysi [14]

Answer:

the step that the student should change is step 7

Explanation:

The movement of the spring with block is a simple harmonic type movement, so the procedure proposed by the student is correct, but we must take some care.

Step 3 is important since each movement will be started with similar conditions, also if any displacement is very large we can get out of the linear approximation of Hooke's law, for which we need to know the equilibrium point, since from this point displacements will be measured.

Step 6 should be changed to measure various oscillations to find the average period and thus decrease the error in the time reading.

Step 7 is wrong since the objective of the experiment is to analyze the effect of different masses in the period of oscillation and this step prevents this objective from being carried out.

In conclusion, the step that the student should change is step 7

5 0

3 years ago

The mc002-1.jpgHrxn of formation of carbon dioxide is negative. Which statement is true?

s344n2d4d5 [400]

When the formation of carbon dioxide is negative, it means that it releases heat to the surroundings. When it releases heat to the surroundings, the reaction is exothermic.

3 0

3 years ago