How much force is needed to get a 0.9kg block of wood to slide if the static coefficient of friction is 0.8

Answers

Answer 1

Answer: 0.8?? DONT know how to solve

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Cecil is working with samples of chlorine (Cl), oxygen (O), bromine (Br), and silver (Ag). The samples are all at room temperature. Which substance is most likely the most dense?chlorine
oxygen
bromine
silver

Answers

Answer: Option (d) is the correct answer.

Explanation:

As it is known that density is the amount of mass divided by the volume.

Mathematically, Density = $(mass)/(volume)$

Since, mass is directly proportional to density. Hence, more is the mass of an object more will be its density.

At room temperature chlorine exists as a gas and its molar mass is 35 g/mol.

At room temperature oxygen exists as a gas and its molar mass is 32 g/mol.

At room temperature bromine exists as a liquid and its molar mass is 80 g/mol.

At room temperature silver exists as a solid and its molar mass is 108 g/mol.

As the mass of silver is greater and it exists as a solid at room temperature. Hence, it will be most dense in nature.

Therefore, we can conclude that out of the given options silver substance is most likely the most dense.

The answer is silver. Silver is the most dense, it's a solid so it is more compact and is obviously the most likely to have more mass to it.

A soccer ball is kicked horizontally off a bridge with a height of 36 m. The ball travels 25 m horizontally before it hits the pavement below. What was the soccer ball’s speed when it was first kicked

Answers

Answer:

9.23 m/s

Explanation:

Let, the initial velocity be ux.

The horizontal velocity remans the same. So, time required, t = 25/ux

For vertical component, we know,

h = uy*t + (1/2)*g*t^2 [ g is positive because ball is falling downward ]

Putting in the values, we get,

36 = 0*(25/ux) + 1/2 * 9.81 * (25/u)^2

36 = 3065.625/u^2

u^2 = 85.15625

u = 9.23

[ If there's a problem with the solution, please inform me ]

A sound wave is traveling at a speed of 330 m/s. If the frequency of the wave is 660 Hz, what is the wavelength of the sound wave?2 m
330 m
990 m
0.5 m

Answers

Answer:

The wavelength of the sound wave traveling at 330 m/s is 0.5 m.

Explanation:

Given:

Speed of sound wave is, $v=330\ m/s$

Frequency of the sound wave is, $f=660\ Hz$

Speed of a sound wave is related to its frequency and wavelength as:

$v=f\lambda$ , where, $\lambda$ is the wavelength.

Now, plug in 330 for $v$ , 660 for $f$ and solve for $\lambda$ . This gives,

$330=660\lambda\n\lambda=(330)/(660)=0.5\ m$

Therefore, the wavelength of the sound wave traveling at 330 m/s is 0.5 m.

According to the first law of thermodynamics what could happen when heat is added to a system

Answers

Answer: Increase internal energy and work done by the system

Explanation: According to the first law of thermodynamics conservation of energy, when heat is added to the system then the system gain or loss of energy.

So, when we add heat to a system then increases internal energy and external work done by the system.

temperature rises ? specific heat capacity etc ...

Ionic compounds molecules have strong forces of attraction between neighboring molecules. Which conclusion could be drawn about materials held together by ionic bonds? A) These materials would have low densities as solids. Eliminate B) These materials would have very high boiling points. C) These materials will likely be gases at room temperature. D) These materials will likely be liquids at room temperature.