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3 years ago

14

you throw a rock with a horizontal velocity at 36.6 m/s out a window that is 29.5 m above the ground. What was it’s total time i

n the air?

1 answer:

ANEK [815]3 years ago

4 0

29.5-4.9x^2= your answer

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Check all the true statements about sound and light waves.

bixtya [17]

Answer:

See explanation.

Explanation:

Let us go through each of statements one by one.

Light waves may travel either through a transparent medium or through empty space.

Yes, light travels through empty space as well as through transparent media, however, in the latter its speed is slowed down.

Sound waves travel through all substances.

Sound waves are vibrations in a medium. All substances can vibrate; therefore, sound travels through all substances.

Light waves are absorbed and reflected by opaque materials so that no light travels through them.

This is true. The reason light does not pass through an opaque substance is because it is absorbed or reflected way from us.

Light waves cannot travel through empty space.

No, <em>electromagnetic radiation can travel through empty space</em> because it is not a disturbance in a medium.

Sound waves do not require a medium for traveling,

Nope. Sound waves are disturbances in a medium—they cannot exist independent; therefore, they require a medium for travelling.

Sound waves can only travel through transparent objects

No. Sound waves travel through all substances that can vibrate.

Sound waves require a medium for traveling,

As sound waves are vibrations in a medium, they need medium in which they can exist and travel.

5 0

3 years ago

What are tides?

3241004551 [841]

Answer:

4th

Explanation:

Rise and fall of the water level on the sea shore

4 0

3 years ago

Read 2 more answers

A cell membrane consists of an inner and outer wall separated by a distance of approximately 10nm. Assume that the walls act lik

Lady bird [3.3K]

Answer:

The options are approximations of the exact answers:

A) $1\times10^6N/C$

B) $2\times10^{-13}N$

C) $1\times10^{-2}V$

D) Toward the inner wall

E) $3\times10^{-17}J$

Explanation:

A) The electric field in a parallel plate capacitor is given by the formula $E=\frac{\sigma}{k\epsilon_0}$ , where $\epsilon_0=8.85\times10^{-12}C/Vm$ and in our case $\sigma=10^5C/m^2$ and, for air, $k=1.00059$ , so we have:

$E=\frac{10^5C/m^2}{(1.00059)(8.85\times10^{-12}C/Vm)}=1.13\times10^6N/C$

B) The K+ ion has one elemental charge excess, so its charge is $q=1.6\times10^{-19}C$ , and the force a charge experiments under an electric field E is given by F=qE, so we have:

$F=(1.6\times10^{-19}C)(1.13\times10^6N/C)=1.81\times10^{-13}N$

C) The potential difference between two points separated a distance d under an uniform electric potential E is given by $\Delta V=dE$ , so we have:

$\Delta V=(10\times10^{-9}m)(1.13\times10^6N/C)=1.13\times10^{-2}V$

D) The electic field goes from positive to negative charges, so it goes towards the inner wall.

E) The work done by an electric field through a potential difference $\Delta V$ on a charge Q is $W=Q\Delta V$ , and is equal to the kinetic energy imparted on it, so we have:

$K=(3\times10^{-15}C)(1.13\times10^{-2}V)=3.39\times10^{-17}J$

5 0

4 years ago

If enough heat was REMOVED from B, it would change into ____________.

Sindrei [870]

It would change into a gas.

5 0

3 years ago

A soccer player strikes a soccer ball with a force of 550 N. If the player and the ball remain in contact for 0.03 s. What impul

Yuliya22 [10]

Easy my dude.
Impulse (J) is equal to the change in momentum of the ball. It is also equal to Force times Time:
J = Ft
J = (550 N)(0.03 s)
J = 16.5 Ns

Hope this helps! Please press “Thanks!”

7 0

3 years ago