1answer.
Ask question
Login Signup
Ask question
All categories
  • English
  • Mathematics
  • Social Studies
  • Business
  • History
  • Health
  • Geography
  • Biology
  • Physics
  • Chemistry
  • Computers and Technology
  • Arts
  • World Languages
  • Spanish
  • French
  • German
  • Advanced Placement (AP)
  • SAT
  • Medicine
  • Law
  • Engineering
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 .

You might be interested in
An object traveling at a constant
mel-nik [20]

Answer:

pi / 2  radians / s

Explanation:

One revolution = 2 pi Radians    in 4 seconds

2 pi  /  4   =   pi/2   radians / s

4 0
2 years ago
A horizontal desk surface measures 1.7 m by 1.0 m. If the Earth's magnetic field has magnitude 0.42 mT and is directed 68° below
AlexFokin [52]

Answer:

The magnetic flux through the desk surface is 6.6\times10^{-4}\ T-m^2.

Explanation:

Given that,

Magnetic field B = 0.42 T

Angle =68°

We need to calculate the magnetic flux

\phi=BA\costheta

Where, B = magnetic field

A = area

Put the value into the formula

\phi=0.42\times10^{-3}\times1.7\times1.0\cos22^{\circ}

\phi=0.42\times10^{-3}\times1.7\times1.0\times0.927

\phi=6.6\times10^{-4}\ T-m^2

Hence, The magnetic flux through the desk surface is 6.6\times10^{-4}\ T-m^2.

3 0
3 years ago
Sarah, who has a mass of 55 kg, is riding in a car at 20 m/s. She sees a cat crossing the street and slams on the brakes! Her se
avanturin [10]

Answer:

-2200 N

Explanation:

The change in momentum of Sarah is equal to the impulse, which is the product between the force exerted by the seatbelt on Sarah and the time during which the force is applied:

\Delta p=I\\m \Delta v = F \Delta t

where

m is the mass

\Delta v is the change in velocity

F is the average force

\Delta t is the duration of the collision

In this problem:, we have:

m = 55 kg is Sarah's mass

\Delta v = 0-20 = -20 m/s  is the change in velocity

\Delta t = 0.5 s  is the duration of the collision

Solving for F, we find the force exerted by the seatbelt on Sarah:

F=\frac{m\Delta v}{\Delta t}=\frac{(55)(-20)}{0.5}=-2200 N

Where the negative sign indicates that the direction of the force is opposite to that of Sarah's initial velocity.

5 0
3 years ago
A tennis ball with a velocity of +10.0 m/s to the right is thrown perpendicularly at a wall. After striking the wall, the ball r
netineya [11]

Answer:

-1500 m/s2

Explanation:

So the ball velocity changes from 10m/s into the wall to -8m/s in a totally opposite direction within a time span of 0.012s. Then we can calculate the average acceleration of the ball as the change in velocity over a unit of time.

a = \frac{\Delta v}{\Delta t} = \frac{-8 - 10}{0.012} = \frac{-18}{0.012} = -1500 m/s^2

6 0
3 years ago
In any electromagnetic wave,
puteri [66]

A). Both the energy and the wave travel in the same direction.

If they didn't, they'd wind up in different cities almost instantly.

6 0
3 years ago
Other questions:
  • Which of the following statements best supports the idea that science strives for objectivity?
    9·2 answers
  • Which part of the electromagnetic spectrum generally gives us our best views of stars forming in dusty clouds?
    9·1 answer
  • What happens when you break a magnet in half
    12·2 answers
  • What is a star called that dies peacefully​
    11·2 answers
  • If an object with a mass of 12 kilograms is moving at 10 meters per second, what is its momentum?
    6·1 answer
  • How much pressure is applied to the ground by a 78 kg man who standing on square stilts that measure 0.04 m on each edge ? Answe
    10·1 answer
  • imagine you are a teacher of a science class. a student brings in a newspaper article that claims the world will run out of ener
    13·1 answer
  • A force of 100N moves a body on a horizontal frictionless surface when......
    13·1 answer
  • How long does it take for a bicycle traveling 7.0 m/s to come to a stop if the
    12·2 answers
  • Uranus and neptune have methane clouds but jupiter and saturn do not. Which factor explains why?.
    5·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!