A 5.0 kg rock is dropped from the top of a building. The speed of the rock after it has fallen for 2.2 seconds is?
an airplane travels from St. Louis to Portland, Oregon in 4.33 hours. If the distance traveled is 2742 km what is the airplanes average speed?
what is the volume of 325 g of metal with a density of 9.0 g/cm3
The volume of 325 g of metal with a density of 9.0 g/cm³ is 36.11cm³
HOW TO CALCULATE VOLUME:
The volume of a substance can be calculated by dividing the mass of the substance by its density as follows:Volume(mL) = mass(g) ÷ density (g/mL)
According to this question, the density of 325g of metal is given as 9.0 g/cm³, hence, the volume can be calculated as follows: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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What is the instantaneous speed at 5 seconds? (remember s=d/t)
1 m/s
25 m/s
5 m/s
15 m/s
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:
Choose all that apply. Solids, liquids, and gases can be distinguished by their:
molecular weight
shape
temperature
kinetic energy
mass
density
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:
Shape: Solids have a fixed shape, while liquids take the shape of their container and gases have no fixed shape.Density: Typically, solids are denser than liquids, which are in turn denser than gases, although there are exceptions when substances change phase.Kinetic Energy: Gases have the highest kinetic energy due to the fast movement of their molecules, while solids have the least.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.
How does the law of conservation of mass apply to this reaction Mg+HCL->H2+MgCl2?
Answer :
Law of conservation of mass : It states that the mass of reactant molecules must be equal to the mass of product molecules.
The given unbalanced reaction is,[tex]Mg+HCl\rightarrow H_2+MgCl_2[/tex]
First we have to balance the chemical reaction.
The balanced chemical reaction is,[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.
explain how does air resistance affect acceleration and speed of an object?
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. What happens to the box?
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.