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3 years ago

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When dolphin swims close to its prey, it transmits sound waves to figure out details (like direction where the fish is moving) o

f its prey. Now, if the frequency of the reflected waves has increased, would the dolphin catch up its prey or fall behind? Explain your answer.

1 answer:

svet-max [94.6K]3 years ago

8 0

Answer:

The frequency of the waves depends on the distance between wave fronts - considering a front as a maximum disturbance of the wave

(Consider the waves emitted by an organ pipe: condensation and rarefactions)

The waves themselves are a fixed distance apart -

as one moves towards the source the waves received will be closer together (higher frequency)

So if the frequency received increases, the distance between the source and the observer must be decreasing

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A student pulls down with a force of 40 N on a rope that winds around a pulley of radius 5 cm. find the torque?

Anna71 [15]

Answer:

2N

Explanation:

Given that a student pulls down with a force of 40 N on a rope that winds around a pulley of radius 5 cm. find the torque?

Solution

Using the formula

Torque = Force × radius

I.e

Torque = F r

Where

F = 40N

r = 5 cm = 5/100 = 0.05m

Substitute all the parameters into the formula

Torque = 40 × 0.05

Torque = 2 N

Therefore, the torque on this scenario is 2 N

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3 years ago

How many poles in a rolo?

Yakvenalex [24]

Answer: 7

Explanation:

How many pieces are in a ROLO tube?

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3 years ago

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1 Table Exercise the object released from atop of building house of heigh 10m . Calculaie a final velocity if it time is 4s

Alekssandra [29.7K]

Answer:

What is velocity?

v = d/t = distance / time you need to know this formula !

= 10 m/ 4 s = 2.5 m/s

Explanation:

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3 years ago

Elizabeth, with a mass of 56.1kg stands on a scale in an elevator. Total mass of elevator plus Elizabeth=850kg. As the elevator

Reil [10]

Answer:

acceleration = 1.79 m/s^2

Tension = 6817 N

Explanation:

First let's find Elizabeth's weight:

$P = m*g = 56.1 * 9.81 = 550.34\ N$

Her weight is greater than the normal force (N = 450 N), so the elevator is going downwards.

The acceleration of Elizabeth is given by:

$P - N = m*a$

Where P is the weight of Elisabeth, N is her normal force, m is her mass and a is the acceleration. Then, we have that:

$56.1*9.81 - 450 = 56.1*a$

$a = 100.34 / 56.1 = 1.79\ m/s^2$

The tension in the cable is given by:

$P - T = m*a$

In this case, we use the total mass, so we have:

$850*9.81 - T = 850*1.79$

$T = 850 * 8.02 = 6817\ N$

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3 years ago

"The condition of equilibrium is when the sum of the forces acting on a body is the zero vector. Suppose a body has a force of 2

vivado [14]

Answer:

The answer is $F= 2.881$ <em> pounds</em>

Explanation:

We will start this question by representing the force vectors in Cartesian coordinate system:

Force 1 acting on the right $F_{1} = (2, 0)$
Force 2 acting upward $F_{2} = (0,5)$
Force 3 acting at 45° $F_{3} = (3cos(45),3sin(45))$

Let the single force we need be represented by $F=(x,y)$

Since, the body is in equilibrium the summation of all the forces acting on it should be zero:

∑ $F_{x} = 0$ (Sum of all forces in $x$ direction is equal to zero)

$x + 2 - 3cos(45) =0$ ( $x$ component of force 3 is negative because it is acting in opposite direction)

$x = 0.1213$

∑ $F_{y}=0$ (Sum of all forces in $y$ direction is equal to zero)

$y+5-3sin(45)=0$ ( $y$ component of force 3 is negative because it is acting in opposite direction)

$y=-2.8786$

So,

$F=(0.1213,-2.8786)$

Hence, to get the scalar quantity of a single force:

$F=\sqrt[2]{(0.1213)^{2}+(-2.8786)^{2} }$

$F= 2.881$ <em> pounds</em>

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3 years ago