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4 years ago

A. In your own words, define what a longitudinal wave is.

Physics

1 answer:

Stella [2.4K]4 years ago

7 0

Answer:

Longitudinal wave is a type of wave in which the the movement of the wave particle is parallel to the direction of the wave propagation. This simply means that the wave particles is in the same or opposite direction to the wave propagation.

B. Sound waves- These are longitudinal waves because its medium particles through which the sound is transported oscillates parallel to the direction of the movement of the sound wave.

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What is the object’s velocity, in meters per second, at time t = 2.9? Calculate the object’s acceleration, in meters per second

madreJ [45]

Answer:

the question is incomplete, below is the complete question

"An object is undergoing simple harmonic motion along the x-axis. Its position is described as a function of time by x(t) = 5.5 cos(4.4t - 1.8), where x is in meters, the time, t, is in seconds, and the argument of the cosine is in radians.

a.What is the object's velocity, in meters per second, at time t = 2.9?

b.Calculate the object's acceleration, in meters per second squared, at time t = 2.9.

c. What is the magnitude of the object's maximum acceleration, in meters per second squared?

d.What is the magnitude of the object's maximum velocity, in meters per second?"

a. $v(t)==24.1m/s$

b. $a(t)=3.79m/s^{2}$

c. $a_{max}=106.48m/s^{2}$

d. $v_{max}=24.2m/s$

Explanation:

the gneral expression for the displacement of object in simple harmonic motion is represented by

$x(t)=Acos(wt- \alpha)\\$

while the velocity is express as

$v(t)=-Awcos(4.4t-1.8)\\$

and the acceleration is

$a(t)=-aw^{2}cos(wt- \alpha )\\$

Note: the angle is in radians

The expression for the displacement from the question is $x(t)=5.5cos(4.4t-1.8)\\$

comparing, A=5.5, <em>w=4.4,α=1.8</em>

a.To determine the object velocity at t=2.9secs,

we substitute for t in the velocity equation

$v(t)=-5.5*4.4sin(4.4*2.9-1.8)\\v(t)=-24.2sin(10.96)\\$

$v(t)=-24.2*(-0.9993)\\v(t)==24.1m/s$

b.To determine the object acceleration at t=2.9secs,

we substitute for t in the acceleration equation

$a(t)=-5.5*4.4^{2} cos(4.4*2.9-1.8)\\a(t)=-106.48cos(10.96)\\$

$a(t)=-106.48*0.0356\\a(t)=3.79m/s^{2}$

c. The acceleration is maximum when the displacement equals the amplitude. hence magnitude of the object acceleration is

$a_{max}=-w^{2}A\\ a_{max}=-4.4^{2}*5.5\\ a_{max}=106.48m/s^{2}$

d.The maximum velocity is expressed as

$v_{max}=wA\\v_{max}=4.4*5.5\\v_{max}=24.2m/s$

5 0

3 years ago

Which change to a circuit is most likely to decrease its electrical power?

Harlamova29_29 [7]

Answer:

It's D

Explanation:

8 0

3 years ago

Read 2 more answers

Consider the path of a comet orbiting a star, the system of the comet plus the star. Which of the following statements are corre

Stels [109]

Answer:

True 1, 4

False 2, 3, 5

Explanation:

The system is formed by the Sun that is fixed at a point (focus of movement) and the comet that rotates around in styptic orbits. The only force involved is the force of attraction between the two bodies, if we write the energy of the system

Em = K + U

Em = ½ m v2 + G m Ms / r2

where m is the mass of the comet, Ms the mass of the Sun and r the distance between them.

This system is isolated so the energy is conserved throughout the movement, it only transforms from kinetic to gravitational potential.

Let's review the different claims;

1) True. The speed of the comet determines its kinetic energy, so when decreasing the speed decreases the kinetic energy, there is also a decrease due to the lost mass

2) False. The total energy is constant, so if the kinetic energy increases, the power energy must decrease

3) False. The comet's speed changes are due to changes in gravitational energy, so no external work is needed to change the speed.

4) True. Correct because the sum of the two must be constant

5) False. When the comet loses speed, the energy increases, the power would gravitate, so there is no loss of energy, we are ignoring the loss of mass of the comet.

8 0

3 years ago

inna [77]

Answer:

5g/cm

Explanation:

denisty=mass/volume

100/20

5g/cm

8 0

3 years ago

if a student wanted to design an experiment that uses sound scientific principles, which of the following should he or she not d

nikklg [1K]

Things he should do
1) Take several readings.
2) And find the average of the readings to get the accurate value.
Things should not do
1) Avoid human error.
2) Zero error

4 0

3 years ago