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3 years ago

Which of these is a TRUE statement

Physics

2 answers:

Illusion [34]3 years ago

7 0

Answer:

The true statement is that sound travels through solids easier than liquids

Explanation:

The first statement is wrong as sound travels faster within a denser medium

The third statement is wrong as sound travels faster within a denser medium

The fourth statement is wrong as solids are denser than liquids. That is why when you put your ear on the track of a train (DON'T TRY IT) the sound reaches faster to your ears than if you hear something underwater

dangina [55]3 years ago

3 0

Answer:

Sound travels through solids and liquids at the same speed

Explanation:

Because sound needs a dencer object to travel fast and since both liquid and solids are closer than gas sound travles faster in them.

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A 50 kilogram woman wearing a seatbelt is traveling in a car that is moving with a velocity of +10 meters per second. In an emer

ra1l [238]

Answer:

the answer is A.) -1 * 10^3[N]

Explanation:

The solution consists of two steps, the first step is using the following kinematic equation:

$v=v_{i} +a*t\\where:\\v=final velocity [m/s]\\v_{i}=initial velocity [m/s]\\a=acceleration[m/^2]\\t=time[s]\\$

The initial velocity is 10 [m/s], and the final velocity is zero because the car stops in 0.5[s].

Replacing:

$0=10+a*(0.5)\\a=-20[m/s^2]$

Now in the second part, we need to use the second law of Newton, this law relates the forces with the acceleration of a body.

In the moment when the car stops suddenly the driver will feel the force of the seatbelt acting in the opposite direction of the movement.

$F=m*a\\F=50[kg]*(-20[m/s^2])\\units\[kg]*[m/s^2]=[N]\\F=-1000[N] or -1*10^{3} [N]$

The minus sign means that the force is acting in the opposite direction of the movement.

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3 years ago

Which of the following is an example of aerobic activity?

mafiozo [28]

An example of an aerobic activity would be A, Cross-country skiing

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3 years ago

The Statue of Liberty is made of copper that has turned green because it had undergone a change. What can be said about this cha

Sergeeva-Olga [200]

D. because the statue has a new chemical called patina. It is no longer copper.

3 0

3 years ago

Read 2 more answers

A car on a freeway speeds up to get around another car. The car speeds up from 20 m/s to 35 m/s in 5 seconds.

Tanzania [10]

Answer:

Initial speed = 20 m/s

Final speed = 35 m/s

Time to speed up = 5 seconds

Explanation:

Directly from the information given:

Initial speed = 20 m/s

Final speed = 35 m/s

Time to speed up = 5 seconds

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3 years ago

What is the process of change in a crust due to the motion of hot material underneath?(answer)?

frutty [35]

Im not exactly sure but I think the answer is techtonic plates collide

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3 years ago