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3 years ago

why are waves faster in liquids and gases than in air

Physics

2 answers:

amm18123 years ago

8 0

Answer:

see explanation

Explanation:

sound travels faster in liquid than in gases because the molecules are packed closer together!

hope this helped! xoxo raina

Alika [10]3 years ago

4 0

Answer:

Sound travels faster in liquids than in gases because molecules are packed more closely together. This means that when the water molecules begin to vibrate, they quickly begin to collide with each other forming a rapidly moving compression wave. Sound travels over four times faster than in air

Explanation:

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To practice Problem-Solving Strategy 2.1 Motion with constant acceleration You are driving down the highway late one night at 20

Alekssandra [29.7K]

Answer:

a) $\Delta s=5\ m$ is the distance between deer and the vehicle

b) $u'=22.36\ m.s^{-1}$ is the maximum speed the driver can be at and still not hit the deer.

Explanation:

Given:

initial speed of driving, $u=20\ m.s^{-1}$

distance of deer from the vehicle, $x=35\ m$

reaction time taken to step onto the brakes, $t'=0.5\ s$

maximum deceleration of the car, $a_m=-10\ m.s^{-2}$

Now the distance travelled after application of the brakes till the vehicle stops:

$v^2=u^2+2a_m.s$

(assuming that the brakes are applied with maximum acceleration)

where:

$s=$ displacement of the vehicle after braking till it stops

$v=$ final velocity of the vehicle = 0 (stops)

putting the values:

$0^2=20^2-2\times 10\times s$

$s=20\ m$

Now before the application of the brakes 0.5 second is taken to react and the vehicle travels during this time as well.

So, distance covered before applying the brakes:

$s'=u.t'$

$s'=20\times 0.5$

$s'=10\ m$

The distance between the deer and the vehicle:

$\Delta s=x-(s+s')$

$\Delta s=35-(20+10)$

$\Delta s=5\ m$

The maximum speed the driver can have with the vehicle and still not hit the deer is given as:

$v^2=u'^2+2. a_m.(x-s')$

because s' is the distance covered before braking during the reaction time.

$0^2=u'^2-2\times 10\times (35-10)$

$u'=22.36\ m.s^{-1}$ is the maximum speed the driver can be at and still not hit the deer.

3 0

4 years ago

A car of mass 1000 kg travels around a level curve of radius 40 m. If the maximum frictional force that can be exerted upon the

Tasya [4]

Answer:

The car can travel V=19.8m/s without spinning out

Explanation:

Given that

Mass of the car m=1000kg

Radius of curve r =40m

frictional force R=7000N

Coefficient of friction u=?

We know that F=uR

But F=ma

F=1000*9.81

F=9810N

Therefore u=F/R

u=9810/7000

u=1.40

For the car to travel without spinning out we

Equate it centripetal force formula to frictional force formula

F=mv²/r

F=ur

hence mv²/r=uR

Making velocity subject of formula we have v²=u*r*R/m

V²=(1.4*40*7000)/1000

V²=392

V=√ 392

V=19.8m/s

8 0

3 years ago

the atomic number of an element is equal to the number of______ contained in one atom of that element

Tems11 [23]

Answer:Protons

Explanation:

4 0

3 years ago

Read 2 more answers

A couple walking in the park strolls 1.5 km in 60 min. What is the couple’s average speed in m/h?

cricket20 [7]

Answer:

0.932 m/h

Explanation:

Parameters given:

Distance walked by couple, D = 1.5 km

Time spent in walking, t = 60 min

To solve this we simply apply the formula for average peed:

Average Speed = total distance / total time taken

The question asks specifically to put the answer in miles per hour (m/h), hence, we need to convert the distance to miles and the time to hours:

Distance in miles:

1 km = 0.622 miles

1.5 km = 1.5 * 0.622 = 0.932 miles

Time in hours = 60 / 60 = 1 hour

Hence, the speed is:

Speed = 0.932 / 1 = 0.932 m/h

The average speed of the couple is 0.932 m/h

6 0

3 years ago

Read 2 more answers

The acacia ant is a parasite on the acacia tree. True False

stiv31 [10]

The answer you are looking for is: 
True 
Hope that helps!! 
Have a wonderful day!!

4 0

3 years ago

￼ why are waves faster in liquids and gases than in air￼

why are waves faster in liquids and gases than in air