How could you compare the energy carried in two different longitudinal waves

Answers

Answer 1

Answer: U could compare them using the intensity technique when bending waves are negligible in comparison with quasi-longitudinal waves.

Answer 2

Answer: Energy carried in two ways can be campared by using the intensity technique when bending waves are negligible in comparison with quasi-longitudinal waves.

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A Block slides down an incline that makes an angle of 30? with the horizontal direction. The coefficient of kinetic friction between the incline and the block is µk = 0.3i) Determine the acceleration of the block.
ii) The block starts at rest from a height of 8m above the ground. What is the speed of the block when it reaches the bottom of the incline.

Answers

Answer:

Acceleration = 2.35 m/ $s^(2)$

Speed = 8.67 m/s

Explanation:

The coefficient of friction , u =0.3

The angle of incline = 30°

The two forces acting on block are weight and friction.

weight along the incline = mg cos60° = $(mg)/(2)$ = 0.5 mg

Friction along incline = umg cos30° = mg $0.3* (√(3))/(2)$

Friction along incline = 0.26 mg

Net force acting on the weight = (0.5 - 0.26) mg = 0.24 mg

Acceleration = $(net force)/(mass)$ = 0.24 g = 2.35 m/ $s^(2)$

The height of incline = 8 m

Length of the inclined edge = 16 m

$v^(2)=u^(2)+2as$

$v^(2)= 2* 0.24 * 9.8* 16$

v= 8.67 m/s

A sewing machine needle moves up and down in simple harmonic motion with an amplitude of 1.27 cm and freuency of 2.55 Hz.(a) what's the maximum speed of the needle ?
(b) what's the maximum acceleration of the needle ?

Answers

Answer:

The tip of the needle to move from the highest point to the lowest point in 0.4 sec and the needle tip to travel a total distance in 0.9 sec.

Explanation:

Given that,

Frequency = 2.5 Hz

Amplitude = 1.27 cm

(a). We need to calculate the time

The frequency is the reciprocal of the time.

The time taken from highest point to lowest point

(b). We need to calculate the time

The time taken in one cycle = 0.4 sec

The distance covered in one sec= 4 times x amplitude

We need to calculate the speed

Using formula of speed

We need to calculate the time

Hence, The tip of the needle to move from the highest point to the lowest point in 0.4 sec and the needle tip to travel a total distance in 0.9 sec.

Speed of wave can change ifA) none of the other choices
B) pressure changes
C) temp changes
D) all the other choices
E)enters new medium

Answers

B- the pressure changes

What are the primary differences between stars and planets

Answers

Stars don't have moons and planets do

stars aren't big enough to emit enough kight and heat meaning they cant cause nuclear reactions

Two identical freight cars roll without friction (one at 1 m/s, the other at 2 m/s) toward each other on a level track. They collide, couple together, and roll away in the direction that _________.

Answers

Answer:

They collide, couple together, and roll away in the direction thatthe 2m/s car was rolling in.

Explanation:

We should start off with stating that the conservation of momentum is used here.

Momentum = mass * speed

Since, mass of both freight cars is the same, the speed determines which has more momentum.

Thus, the momentum of the 2 m/s freight car is twice that of the 1 m/s freight car.

The final speed is calculated as below:

mass * (velocity of first freight car) + mass * (velocity of second freight car) = (mass of both freight cars) * final velocity

(m * V1) + (m * V2) = (2m * V)

Let's substitute the velocities 1m/s for the first car, and - 2m/s for the second. (since the second is opposite in direction)

We get:

$m*1 + m*(-2) = 2m*V$

solving this we get:

V = - 0.5 m/s

Thus we can see that both cars will roll away in the direction that the 2 m/s car was going in. (because of the negative sign in the answer)

A wedge is simply a form of an inclined plane. TRUE or FALSE.

Answers

The statement about "A wedge is simply a form of an inclined plane" is false. The pivot joint is the lever and the wedge are the blades of the scissors. This is to efficiently exert force on an object to cut it.

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