I need help with these questions please help


25 points

Answer:

I think 18 not entirely sure though

Explanation:

Group 18 are the noble group so 16 + 2 = 18

Answer:

2 * 10^5 pa

Explanation:

Pressure = Force / Area

Each thigh bone has a cross sectional area of 10cm²

Both thigh bones :

2 * 10cm² = 20cm²

To m² : 20 * (0.01)²

20 * 0.0001 m² = 0.002 m²

Force = mass * acceleration due to gravity(g)

g = 10m/s² ;

Force = 40 * 10 = 400N

Pressure = 400 N / 0.002 m²

Pressure = 200,000 N/m² = 2 * 10^5 pascal

Answer:

The desk will move to the left.

Explanation:

Since Manuel is exerting a force of 10 N to the right, and Lynn is exerting a force of 15 N to the left, it means that Lynn is exerting a force of 5 N more than Manuel, meaning that the desk will move to the left, the direction Lynn is pushing it too.

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Hope it helps!

Answer:

He not only hypothesized that lightning and electricity were linked, but that metal objects could be used to draw lightning in order to protect homes from being hit. But Franklin didn't feel that he could get his conductor high enough into the clouds to do any good, so he never completed the experiment.

Explanation:

there ya go :)

The mass of a 5kg object is 5kg. Makes no difference where it happens to be located.

Answer:

The mass of a 5kg object is 5kg

Explanation:

Have a great day

Answer:72 N

Explanation: thats whats right

Answer:

t=3.964s

Explanation:

Use t=d/s

t=53.2m/13.42m/s= 3.964s

Answer:

V=21.0211m/s

Explanation:

Use V=vi+at

So, V=17.46m/s+(1.49m/[tex]s^{2}[/tex])(2.39s)= 21.0211m/s

Answer:

322.5mL

Explanation:

According to Charles's law, which state that at constant pressure the volume of fixed mass of a gas is proportional directly to it's temperature.

This can be expressed as

V1/ T1 = V2 / T2

Where

V1= initial volume= 693 mL

V2= final volume

T2= final temperature=( –125°C + 273)= 148K

T1= initial temperature= (45°C+ 273)=318K

V1/ T1 = V2 / T2

693/318 = V2/148

693×148 = 318 × V2

V2=102564/318

= 322.5mL

Answer:

2.5 hours

Explanation:

we know that the train travels 64km every hour so we just need to divide 160km by 64km to see how many hours it will take

160÷64= 2.5

hope this helps chu :3

Answer: transverse wave

Explanation: the particles are moving up and down

Answer:True. The number of calories in a food is a measure of how much potential energy that food possesses.

Explanation:

Answer:

40,000N

Explanation:

Force = Acceleration × Mass

2000×20=40,000

Answer is in the photo. I can't attach it here, but I uploaded it to a file hosting. link below! Good Luck!

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Answer:

40m

Explanation:

distance = length traveled = 20+20 = 40

Answer:

silverware and tupperware?

Answer:

Climate.

Explanation:

Weather can be defined as the atmospheric conditions of a particular area over a short period of time.

The elements of weather include precipitation, wind, temperature, atmospheric pressure, relative humidity, cloud, and wind speed.

The long-term average weather for a region is called climate.

This ultimately implies that, when the average atmospheric conditions prevailing in a specific region persists for a very long period of time, it is known as climate.

Answer:

convergence is the correct answer

Answer:

absorption, concealment, containment, refrain, repression, suppression, withholding, confinement, restriction, constraint

wait no....

diffusion, emission, polarization, spread, ramification, divarication, propagation, transmission, broadcast, circulation and dissipation.

LOL

Answer:

sorry I didn't get it, my apologies

Explanation:

let us asume 2 balls here,

ball 1 and ball2

ball 1 is dropped from the lower hight

where as the ball2 is dropped from higher height

which means ball2 has more force

which is, to every action there is an opposite reaction!

thus ball2 will bounce more!

I dont really know but i think the first one is true super sorry

Electromagnets are an example of how electricity can create magnetism is True statement.

Permanent magnets are not the same as electromagnets. Coils of wire with electricity running through them make up electromagnets. An electromagnet's wire coils act like magnets when an electric current flows through them because moving charges produce magnetic fields.

The coils stop functioning as a magnet when the electricity is turned off. When magnetic forces are only required for brief periods of time, electromagnets are frequently used in electrical equipment.

They both make use of electromagnets, which use electricity to apply a magnetic field. Extremely strong electromagnets are used by wrecking yards to transfer heavy scrap metal or even entire cars from one location to another.

Therefore, Electromagnets are an example of how electricity can create magnetism is True statement.

To learn more about Electromagnet, refer to the link:

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The speed of the blocks after the collision is most nearly will be Vf= 2.376 m/s.

Collision is defined as when two bodies of different masses move towards each other with a particular speed, then there will be three cases after the collision.

Elastic collision, in which the kinetic energy of the object remains constant.

Inelastic collision in which the kinetic energy is not conserved after the collision.

Completely elastic collision, in which the masses stick together after the collision and  move with a final speed.

It is given in the question that

Mass of body A= 2 kg

Velocity of body A= ?

Mass of body B=3 kg

Velocity of body B= 0 m/s

since the body is coming from the inclined place at an angle 30 so the height will be calculated as:

[tex]\rm Sin\theta=\dfrac{h}{H}[/tex]

Inclined plane H=3.6 m

[tex]\rm Sin30=\dfrac{h}{3.6}[/tex]

[tex]h=1.8 m[/tex]

Now the initial velocity of the object from the conservation of energy

[tex]m_Agh=\dfrac{1}{2}m_Av_A^2[/tex]

[tex]v_A=\sqrt{2gh[/tex]

[tex]v_A=\sqrt{2\times9.81\times 1.8}=5.94\ \frac{m}{s}[/tex]

Now form the collision is completely elastic so the momentum before collision will be equal to after collision.

[tex]m_Av_A+m_Bv_B=(m_A+m_B)v_f[/tex]

[tex](2\times 5.94)+(3\times0)=(2+3)v_f[/tex]

[tex]v_f=\dfrac{11.88}{5}=2.376\ \frac{m}{s}[/tex]

Thus the speed of the blocks after the collision is most nearly will be Vf= 2.376 m/s.

To know more about collisions, follow

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Answer:

People might misunderstand it and problems might happen because the audience will have different opinions.

Explanation:

Researchers aboard the International Space Station use the latest technology to advance our understanding of health and medicine. option B. This is further explained below.

Generally, wellness refers to a condition of absence of disease or harm.

In conclusion, The newest technological advances in health and medicine are being used by researchers on board the International Space Station. choice B

Read more about health

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Answer: health and medicine

Explanation:

Answer:

* in a tube with both ends open

        λ = 2L / n                    n = 1, 2, 3,…

* tube with one end open and the other closed.  

         λ = 4L / n                     n = (2n ’+ 1 )

Explanation:

When a sound wave enters a pipe, a resonance process occurs, whereby only some wavelengths can occur.

* in a tube with both ends open

in this case there are maximums at each end, so if the length of the had is L

              λ = 2L 1st harmonic

              λ = 2 L / 2 2nd harmonic

              λ = 2L / 3

              λ = 2L / n                    n = 1, 2, 3,…

* In the case of a tube with one end open and the other closed.

At the open end there is a belly and at the closed end a node

              λ = 4L 1st harmonic

              λ = 4L / 3 3rd harmonic

              λ = 4L / 5

              λ = 4L / n                  n = 1, 3, 5,… odd

                                       n = (2n ’+ 1 )      where n’ are all integers

Answer: 44.57°C

Explanation:

The following can be deduced from the question:

Specific heat of water = 4.186 J/kg

From the question, we can infer that 625 × 4.186 joules of heat will be lost when there's a 1°C drop of water.

We then calculate the amount if degrees that it'll take to cool for 7.96 x 10⁴J. This will be:

= 7.96 × 10⁴ /(625 × 4.186)

= 79600/(625 x 4.186)

= 79600/2616.25

= 30.43°C

The final temperature will then be:

= 75.0°C - 30.43°C

= 44.57°C

Answer: an isolated system

Explanation:

Answer:

25m/s

Explanation:

speed = distance/time = 50/2 = 25

Answer:

The plane travels at a rate of 313 meters per second.

Explanation:

Since the speed of sound at an elevation of 40,000 feet, where many aircraft fly, is 295 m / s, if an airplane is flying at Mach 0.92 at this altitude, to determine how fast is the airplane traveling in meters per second you must perform the following calculation:

1 Mach = 1,225.04 km / h

1 km = 1,000 m

1 h = 3,600 sec

1 = 1225.04

0.92 = X

0.92 x 1225.04 = X

1,127.03 = X

(1,127.03 x 1,000) / 3,600 = X

1,127,030 / 3,600 = X

313.06 = X

Thus, the plane travels at a rate of 313 meters per second.

Explanation:

The tension between cars 2 and 3 accelerates cars 3 through 17. That is a total of 15 cars.F = M*a, with M = 15*37,000 = 555*10^3 kga = 0.7 m/s^2Solve for F, in Newtons