All categories

3 years ago

Which of the following are

Physics

2 answers:

Nady [450]3 years ago

7 0

It’s b for sure since the waves move on the ocean

Arlecino [84]3 years ago

7 0

Answer:

sound waves are mechanical waves

Explanation:

Mechanical waves needs a media through which they can transmit, and media must have elasticity

You might be interested in

A wire loop is placed inside a magnetic field. the magnetic flux is maximized when the angel between the field lines and the sur

klasskru [66]

When magnetic field lines and surface area are perpendicular to each other.

6 0

3 years ago

Earth has an __ of about 30 percent, reflecting much of the sun's radiation<br> back into space.

kotegsom [21]

Answer: albedo

Explanation: ?

5 0

3 years ago

PLS HELP

Kazeer [188]

The answer would be letter choice B

7 0

3 years ago

A heavy solid disk rotating freely and slowed only by friction applied at its outer edge takes 120 seconds to come to a stop.

alisha [4.7K]

Answer:

The time is 16 min.

Explanation:

Given that,

Time = 120 sec

We need to calculate the moment of inertia

Using formula of moment of inertia

$I=\dfrac{1}{2}MR^2$

If the disk had twice the radius and twice the mass

The new moment of inertia

$I'=\dfrac{1}{2}\times2M\times(2R)^2$

$I'=8I$

We know,

The torque is

$\tau=F\times R$

We need to calculate the initial rotation acceleration

Using formula of acceleration

$\alpha=\dfrac{\tau}{I}$

Put the value in to the formula

$\alpha=\dfrac{F\times R}{\dfrac{1}{2}MR^2}$

$\alpha=\dfrac{2F}{MR}$

We need to calculate the new rotation acceleration

Using formula of acceleration

$\alpha'=\dfrac{\tau}{I'}$

Put the value in to the formula

$\alpha=\dfrac{F\times R}{8\times\dfrac{1}{2}MR^2}$

$\alpha=\dfrac{2F}{8MR}$

$\alpha=\dfrac{\alpha}{8}$

Rotation speed is same.

We need to calculate the time

Using formula angular velocity

$\Omega=\omega'$

$\alpha\time t=\alpha'\times t'$

Put the value into the formula

$\alpha\times120=\dfrac{\alpha}{8}\times t'$

$t'=960\ sec$

$t'=16\ min$

Hence, The time is 16 min.

5 0

3 years ago

Which two fields of study do the principles of biomechanics come from? A. science and technology B. physics and engineering C. b

kati45 [8]

Answer:

B. physics and engineering

Explanation:

Biomechanics is the study of mechanical laws and living organisms. Hence, it comprises of the interrelationships between physics and engineering.

8 0

3 years ago