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Kazeer [188]
3 years ago
14

Two children use a homemade "telephone" consisting of two paper cups attached by an aluminum wire which is 8.4 m long. Determine

the time for the "sound" to travel from one cup to the other. How does this compare with the time for sound to travel the same distance through air? (speed of sound in aluminum is 5100 m/s, in air is 343 m/s)
Physics
1 answer:
lina2011 [118]3 years ago
8 0

Answer:

Explanation:

Distance over wire of aluminium d = 8.4 m

velocity of sound in aluminium = 5100 m /s

time required = distance / velocity

= 8.4 / 5100 s

= .001647 s

velocity of sound in air = 343 m /s

time required = distance / velocity

= 8.4 / 343 s

= .024489 s

Difference of time

= .024489 - .001647

= .022842 s

= 22.842 ms .

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Which requires more work, lifting a 10.0kg load a vertical distance of 2m or lifting a 5.0kg load a distance of 4m?
Minchanka [31]

For each load,  Work = (mass) x (gravity) x (distance .

Bigger load:      Work = (10 kg) x (9.8 m/s²) x (2 m) = 196 joules .

Smaller load:    Work = (5 kg)  x  (9.8 m/s²)  x  (4 m) = 196 joules.

The work required is equal in both cases.

The mass ratio of  2:1  is exactly balanced by
the height ratio of  1:2 .

6 0
3 years ago
Can some answer 7 a and b please
pav-90 [236]

Answer:

a.After 15 second Mr Comer's speed =  1.7 m/s

b.Distance travelled by Mr.Comer in 15 seconds  =   18.75\ m

Explanation:

a. Lets recall our first equation of motion V_{f} =V_{i} + at

Now we know that V_{i} = 0.8m/s , a = 0.06\ m/s^2 and

t = 15 \ sec

Plugging the values we have.

V_{f} =V_{i} + at

V_{f} =0.8 + 0.06 \times 15

V_{f} =0.8+ 0.9

V_{f} =1.7 m/s

Then Mr.Comer's speed after 15 sec = 1.7ms^-1

b.

Lets find the distance and recall our third equation of motion.

V_{f} ^2-V{i}^2 = 2as

So s = distance covered.

Dividing both sides with 2a we have.

\frac{V_{f} ^2-V{i}^2}{2a} = 2as

Plugging the values.

\frac{(1.7)^2-(0.8)^2}{2\times0.06} = 2as

s= 18.75\ m

So Mr.Comer will travel a distance of s= 18.75\ m.

4 0
3 years ago
HELP PLEASE!! GIVING BRAINLIEST!! If you answer this correctly ill answer some of your questions you have posted! (20pts)
anyanavicka [17]

Explanation:

potential energy =360800J

mass(m)=?

height (h)=25m

g=9.8m/s²

we have

potential energy =360800J

mgh=360800J

m×9.8×25=360800

m=360800/(9.8×25)=1472.653061kg

8 0
3 years ago
Read 2 more answers
A soccer ball collides with another soccer ball at rest. the total momentum of the balls
Juliette [100K]

I am pretty sure the answer is C.

4 0
3 years ago
An iguana runs back and forth along the ground. The horizontal position of the iguana in meters over time is shown
pochemuha

Answer:

MY

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Col

6-

SA

5+

4-

MY

Pro

3

Pro

2

Tea

+

→ t(s)

1

2

3

4

5

6

7

3 0
3 years ago
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