Hearing loss due to sound energy damaging the nerve cells in the inner ear. Many animals behavior is influenced by sound energy. They learn to associate events with sounds, so they run when something crunches in the dry grass (might be a coyote), but won't be bothered by the sound of a waterfall. Mood is affected by sound energy. A wine glass can break with sound energy, if the frequency matches the resonant frequency of the wine glass and the amplitude is great enough (one Mythbusters show featured a professional singer who broke a wine glass with his voice without any amplification).

Sound energy causes the particles in the medium it is traveling through to vibrate.

Unlike sound electromagnetic waves can travel trough empty space

hope these different answers help

4 0

3 years ago

A speeding motorist traveling down a straight highway at 100 km/h passes a parked police car. It takes the police constable 1.0

Lubov Fominskaja [6]

Answer:

t = 7.5 s

Explanation:

The distance traveled by the car at the time of meeting of the two cars must be the same. First, we calculate the distance traveled by the police car. For that we use 2nd equation of motion. Here, we take the time when police car starts to be reference. So,

s₁ = Vi t + (0.5)gt²

where,

s₁ = distance traveled by police car

Vi = Initial Velocity = 0 m/s

t = time taken

Therefore,

s₁ = (0 m/s)(t) + (0.5)(9.8 m/s²)t²

s₁ = 4.9 t²

Now, we calculate the distance traveled by the car. For constant speed and time to be 1 second more than the police car time, due to car starting time, we get:

s₂ = Vt = V(t + 1)

where,

s₂ = distance traveled by car

V = Velocity of car = (100 km/h)(1000 m/1 km)(1 h/ 3600 s) = 27.78 m/s

Therefore,

s₂ = 27.78 t + 27.78

Now, we know that at the time of meeting:

s₁ = s₂

4.9 t² = 27.78 t + 27.78

4.9 t² - 270.78 t - 27.78 = 0

solving the equation and choosing the positive root:

t = 6.5 s

since, we want to know the time from the moment car crossed police car. Therefore, we add 1 second of starting time in this.

t = 6.5 s + 1 s

t = 7.5 s

6 0

3 years ago

Double a keeping b and x constant

hram777 [196]

Try and multiply A only and leave B and X alone (constant) try a number like 2

7 0

3 years ago

A body is under the action of two forces 7N and 10N. Find the resultant of the two forces if: 1.) The forces are parallel and ac

Deffense [45]

Answer:

1) 17 N

2) -3 N

3) 14.80 N

4) 4.18 N

5) 12.21 N

Explanation:

The resultant (R) of two forces P and Q acting at an angle θ is given by

$R=\sqrt{P^2+Q^2+2PQcos\theta }$

We have P = 7N and Q =10N

1) The forces are parallel and act in the same direction ( θ = 0° )

$R=\sqrt{7^2+10^2+2*7*10*cos0}=\sqrt{(7+10)^2)}=17N$

2) The forces are parallel and act in opposite directions( θ = 180° )

$R=\sqrt{7^2+10^2+2*7*10*cos180}=\sqrt{(7-10)^2)}=-3N$

3) The forces are inclined at an angle of 60° to each other( θ = 60° )

$R=\sqrt{7^2+10^2+2*7*10*cos60}=14.80N$

4) The forces are inclined at an angle of 160°( θ = 160° )

$R=\sqrt{7^2+10^2+2*7*10*cos160}=4.18N$

5) The forces act at 90° to each other( θ = 90° )

$R=\sqrt{7^2+10^2+2*7*10*cos90}=12.21N$

5 0

3 years ago