If the force of the explosion was focused onto a smaller _____ of the window, then the pressure of the explosion on the window would be even greater.

length
area
volume
density

When a student practicing for a cross country meet runs 250 m in 30 s, then her average speed would be 8.33 m/s.

The total distance covered by any object per unit of time is known as speed. It depends only on the magnitude of the moving object.

The mathematical expression for speed is given by

speed = total distance /Total time

As given in the problem a student practicing for a cross country meet runs 250 m in 30 s,

Total distance covered by the student while running =  250 m

Time is taken by the student while running = 30 seconds,

Her average speed = 250/30

                                 =8.33 m/s.

Thus. her average speed would be 8.33 m/s.

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Answer:

5 seconds is a poor time to ask about, because the speed abruptly changes at exactly 5 seconds.

Up until that time, the speed has been 1 m/s. And then, at exactly 5 seconds, it becomes zero.

_________

It's also a poor question because speed is calculated from the distance covered, but the graph shows displacement, not distance. You can't really tell the distance covered from a displacement graph. For example, if an object happens to be moving in a circle around the place where it started, then the total distance covered keeps increasing, but its displacement is constant.

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Explanation:

Answer :

Law of conservation of mass : It states that the mass of reactant molecules must be equal to the mass of product molecules.

[tex]Mg+HCl\rightarrow H_2+MgCl_2[/tex]

First we have to balance the chemical reaction.

[tex]Mg+2HCl\rightarrow H_2+MgCl_2[/tex]

Now we have  to calculate the mass of reactant side molecules and product side molecules.

Mass of reactants = [tex]Mg+2HCl=(24)+2(1+35.5)=97g[/tex]

Mass of products = [tex]H_2+MgCl_2=2(1)+(24+2(35.5))=97g[/tex]

From this we conclude that the mass of reactant is equal to the mass of product.

Answer:

Law of conservation of mass do not apply to this equation.

Explanation:

The law of conservation of mass states that the mass of objects/element before any reaction must be equal to the mass of objects/element after the reaction.  

Here in this case –  

Mg+HCL->H2+MgCl2

Mass of Mg before reaction = 1

Mass of H before reaction = 1

Mass of Cl before reaction = 1

Mass of Mg after reaction = 1

Mass of H after reaction = 2

Mass of Cl after reaction = 2

Thus it is clear that mass of H and Cl before and after the reaction is not equal and thus law of conservation of mass do not apply to this equation.

[tex]R_x = A_x + B_x + C_x[/tex]

[tex]A_x[/tex] is negative as the vector is in third quadrant.

[tex]B_x[/tex] is positive as it points in the first quadrant.

[tex]C_x[/tex] is positive as it points in the fourth quadrant.

Hence,

[tex]R_x = -1.6 + 3.9 + 1.2[/tex]

[tex]R_x = 3.5[/tex] km

[tex]R_y = A_y + B_y + C_y[/tex]

[tex]A_y[/tex] is negative as it is in third quadrant.

[tex]B_y[/tex] is positive as it is in first quadrant.

[tex]C_y[/tex] is negative as it is in fourth quadrant.

[tex]R_y = -2.8 + 6.4 - 0.7[/tex]

[tex]R_y = 2.9[/tex] km

To calculate the density of a can, the student must first determine its volume, which can be done using the formula for the volume of a cylinder V = πr²h or through displacement methods. Once the volume is known, density is calculated by dividing the mass by the volume.

To calculate the density of a can, the student needs to determine its volume. The volume of a cylindrical can be calculated using the formula for the volume of a cylinder, which is π (pi) times the radius squared times the height (V = πr²h). The student already knows the mass of the can, so once the volume is calculated, density can be found by dividing the mass by the volume

The formula provided (D = m/V) can also be transformed to solve for volume, providing another formula: Volume (V) = Mass (m) divided by Density (D).

In cases where the volume needs to be found through displacement, the formula V = m/p (where p is the density) is used, such as determining the volume of a coin by the water displacement method.

Answer: The box will displace towards right side.

Explanation:

In the given problem, a 5 N force pushes on the right side of a box. At the same time, a 10 N force pushes on the left side of the box. The net force acting on the force is 5 N.

The magnitude of the force acting on the box from the left side is more than the force acting on the box from the right side. The body will displace in that direction in which the magnitude of the applied force is more.

The box is displaced to right by a net force of 5 N.

Therefore, the box will displace towards right side.

Solids, liquids, and gases can be distinguished by their shape, density, and kinetic energy, while molecular weight and mass remain consistent across the states of matter.

Solids, liquids, and gases, the three common phases of matter, can be distinguished by several properties. Solids have a definite shape and volume. Liquids have a definite volume but adapt to the shape of their containers. Gases, on the other hand, have neither a definite shape nor a specific volume, as they expand to fill their containers.

The characteristics that distinguish these states include:

The properties that do not generally differ across the different states of matter include molecular weight and mass. A substance's mass or molecular weight remains consistent regardless of whether it is a solid, liquid, or gas.

The volume of 325 g of metal with a density of 9.0 g/cm³ is 36.11cm³

HOW TO CALCULATE VOLUME:

Volume(mL) = mass(g) ÷ density (g/mL)

Volume = 325g ÷ 9g/cm³

Volume = 36.11cm³

Therefore, the volume of 325 g of metal with a density of 9.0 g/cm³ is 36.11cm³

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