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3 years ago

if a girl is standing in front of a smooth surface from which a sound is reflected, the girl may hear

Physics

2 answers:

Kamila [148]3 years ago

6 0

The girl will hear an ECHO of the sounds that reach her,
(if she is standing more than about 50 feet from the wall).

kupik [55]3 years ago

4 0

ECHO she is in front of the wall

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Megan is waiting for the school bus. She sees it driving down the street straight toward her position. If the bus is moving at a

Maksim231197 [3]

Answer:

Explanation:

Is megan like going to be ran over the question doesn't have enoght info

4 0

4 years ago

Read 2 more answers

A disk with a rotational inertia of 5.0 kg. m2 and a radius of 0.25 m rotates on a frictionless fixed axis perpendicu-

diamong [38]

Answer:1.6 rad/s

Explanation:

Given

moment of Inertia of disk $I=5 kg-m^2$

radius of disc $r=0.25 m$

Force $F=8 N$

Torque $T=I\alpha =F\cdot r$

$5\times \alpha =8\times 0.25$

$\alpha =0.4 rad/s^2$

using

$\theta =\omega _0\times t+\frac{\alpha t^2}{2}$

$\pi =0+\frac{0.4t^2}{2}$

$2\pi =0.4t^2$

$t^2=5\pi$

$t=\sqrt{5\pi }$

$t=3.96 s$

$\omega =\omega _0+\alpha t$

$\omega =0+0.4\times 3.96$

$\omega =1.58 rad/s\approx 1.6 rad/s$

3 0

4 years ago

Bart stole a watermelon in ran 5,000 feet from the cops to chase lasted 0.1 hours how fast was Bart running in miles per hour...

valentinak56 [21]

5000 feet = 0.947 miles.

Speed= ?
Distance=o.947 miles
Time= 0.1 hours

Speed=distance/time
= 0.947/0.1
=9.47 miles per hour

3 0

3 years ago

Light is not a wave because it does not need a medium

Reil [10]

It's a tough question as to whether light is a wave or a particle..

The statement is FALSE. Not all types of waves need a medium to propagate. Light can travel without a medium.

Extra Information:
Light is a longitudinal wave, sound is transverse.
Longitudinal waves do not need a medium.
Transverse waves need a medium.
This is why, for example, in the vacuum of space, light travels from stars, but sound does not.

7 0

4 years ago

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A hypothetical planet has a mass of 1.66 times that of Earth, but the same radius. What is gravitiy near its surface?

baherus [9]

Answer: 16.22 m/s^2

Explanation: g= GM/r^2 G= (6.67x 10^-11) M= 1.66(6x 10^24) r=(6400x 10^3) so

((6.67x10^-11)(1.66x 6x 10^24))/ (6400x10^3)^2 = 16.22 m/s^2

6 0

3 years ago

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