A fishing boat using sonar to locate fish is employing _____. diffraction
reflection
refraction
interference

Answers

Answer 1

Answer:

Answer: reflection

Explanation:

SONAR - Sound Navigation and Ranging

It works on the principle of Echo i.e. the reflection of sound. Sound waves are sent out which get bounced off a nearby object. The reflected sound waves is detected and distance to the object is estimated. Sonar is used to detect, navigate or communicate objects underwater. Thus, a fishing boat uses sonar to locate the fish. It is employing reflection.

Answer 2

Answer: The answer is Reflection

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What has to be different to allow refraction to occur?a. the medium b. the light c. the wave d. the speed
What would likely happen if you were to touch the flask in which an endothermic reaction were occuring? A. The flask would probably feel cooler than before the reaction started. B. The flask would probably feel warmer than before the reaction started. C. The flask would feel the same as before the reaction started. D. none of the above

A student wants to build a circuit with four light bulbs and one bell. A student wants to place a switch in the circuit so that only one light will still be on and the bell will still ring when the switch is opened

Answers

Answer:

we have an circuit with two branches in parallel,

* One formed by the switch and three light bulbs

* Another branch formed by a light bulb and the bell

Explanation:

For the construction of the circuit, let us analyze the conditions given, of the 4 light bulbs, only one should remain lit when the dapple is opened, so we must place three light bulbs and the switch in one branch and the other light bulb in the other branch.

For the bell to sound with the abort circuit it must be on the branch where the single bulb is.

Therefore we have an circuit with two branches in parallel,

* One formed by the switch and three light bulbs

* Another branch formed by a light bulb and the bell

Newton's Law of Cooling says that the rate of cooling of an object is proportional to the difference between its own temperature and the temperature of its surrounding. Write a differential equation that expresses Newton's Law of Cooling for this particular situation.

Answers

Answer:

$(dQ)/(dt) =-hA\Delta T(t)$

Explanation:Newton.s law of cooling states that the rate of cooling of an object is proportional to the difference between its own temperatures and temperature of its surroundings. Mathematically,

$(dQ)/(dt) =-hA [T(t)-T(s)]\n$

$(dQ)/(dt) =-hA\Delta T(t)$

where $Q$ is the heat transfer

$h$ is heat transfer coefficient

$A$ is the heat transfer surface area

$T$ is the temperature of the object's surface

$T(s)$ is the temperature of the surroundings

The acceleration of an object increases by the force applied to it and decreases based on it's mass.

Answers

Explanation:

Force is defined as mass times acceleration.

Mathematically, F = m × a

where F = force

m = mass

a = acceleration

This shows that force is directly proportional to acceleration. So, when greater force is applied then acceleration will also increase.

Whereas acceleration is inversely proportional to mass. So, when there is increase in mass then there will be decrease in acceleration.

Two point charges are brought closer together, increasing the force between them by a factor of 25. By what factor was their separation decreased? In other words, if r1 is the original separation and r2 is the final separation, what is the ratio r1/r2?

Answers

Answer: 1/5

Explanation: The force between the two charge is inversely proportional to the square distance between charges so as the force increased a factor of 25 the distance can reduced divided by a factor of 5.

Beyond what point must an object be squeezed for it to become a black hole

Answers

Answer:

Schwarzschild radius

Explanation:

A black hole is defined as that object from which light cannot escape form the surface of the object because object is very small an very dense. There are numerous black hole sin the universe.

Black hole is well understood by the concept of "escape velocity". Escape velocity is the speed of any object to break the gravitational pull from another object.

Escape velocity depends on mass of the object and the distance from the center of the object ( how big or small the object is ). If the object is smaller or more denser, than the escape velocity is more. If we squeeze our earth to a radius of about 9 mm sphere, then the escape velocity of any object becomes equal to the velocity of light.

And the radius of any object which have an escape velocity which is same as the velocity of light is known as the 'Schwarzschild radius'.

Any object which is smaller than the "Schwarzschild radius' has an escape velocity more than the speed of light and is termed as a black hole.

Thus, any object which is squeezed beyond the Schwarzschild radius be becomes a black hole.

A sinusoidal wave travels along a string. The time for a particular point to move from maximum displacement to zero is 0.13 s. What are the (a) period and (b) frequency? (c) The wavelength is 1.9 m; what is the wave speed?