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3 years ago

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1 answer:

natta225 [31]3 years ago

7 0

Answer:

maybe it is the first one

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Does sound travel faster through stiffer objects yes or no and explain why?

kap26 [50]

Yes because The stiffer the medium the faster the sound waves will travel through it This is because in a stiff material, each molecule is more interconnected to the other molecules around it.

8 0

3 years ago

Read 2 more answers

A bungee jumped of mass m jumps off a brodge. Assume that the bungee cord behaves like an ideal spring of srping constant k when

anzhelika [568]

Answer:

The magnitude of the acceleration is at its maximum value.

Acceleration = $\frac{-Ak}{m} (m/s)^{2}$

Explanation:

During simple harmonic motions such as the oscillation of a spring, at the two extremes of the motion, the acceleration of the mass becomes maximum. This is because this is the point where the force on the body is maximum.

The angular velocity $\omega=\sqrt{\frac{k}{m} }$

At points of maximum extension x, the maximum acceleration is given by the formula.

$a=-A\omega^{2}$

substituting in the value for $\omega$ , this implies that

$a= -A\times (\sqrt{\frac{k}{m} } )^{2}$

⇒ $a=\frac{-Ak}{m} (m/s)^{2}$

4 0

3 years ago

The radio signal sent from the Earth to the Moon was received again on Earth 2.6 seconds after it was sent. The signal ran at 30

Pavlova-9 [17]

Answer:

390000 km

Explanation:

2.6 / 2 = 1.3 (second)

300000 * 1.3 = 390000 km

3 0

3 years ago

During a safety crash, a car impacts a solid concrete barrier and and comes to rest in 0.10s. In a second test, an identical car

kirill [66]

Answer:

The correct answer is C

Explanation:

Change is momentum can be described as the change in the product of mass and velocity of a body. Every moving object as a momentum and the higher the momentum of this object, the harder it is to stop. Impulse (a force), which is sometimes used to describe change in momentum can be described as the product as force multiplied by time.

From the description above, it can be deduced that an increase in impulse can lead to a greater change in momentum. And an increase in impulse can be brought about by an increase in the time it takes a body to be brought to rest after collision. And since the car that hit the water barrels was brought to rest at a longer time, it has a greater change in momentum

8 0

3 years ago

A bus initially moving at 20 m/s with an acceleration of -4m/s² for 5

Alborosie

Answer:

50m; 0m/s.

Explanation:

Given the following data;

Initial velocity = 20m/s

Acceleration, a = - 4m/s²

Time, t = 5secs

To find the displacement, we would use the second equation of motion;

$S = ut + \frac {1}{2}at^{2}$

Substituting into the equation, we have;

$S =20*5 + \frac{1}{2}*(-4)*5^{2}$

$S =100 + (-2)*25$

$S =100 - 50$

S = 50m

Next, to find the final velocity, we would use the third equation of motion;

$V^{2} = U^{2} + 2aS$

Where;

V represents the final velocity measured in meter per seconds.

U represents the initial velocity measured in meter per seconds.

a represents acceleration measured in meters per seconds square.

<em>Substituting into the equation, we have;</em>

$V^{2} = 20^{2} + 2(-4)*50$

$V^{2} = 400 - 400$

$V^{2} = 0$

V = 0m/s

<em>Therefore, the displacement of the bus is 50m and its final velocity is 0m/s.</em>

5 0

3 years ago