Construct an example of a food chain that involves mosquitos

The siren on an ambulance emits a sound of frequency 2.80×103Hz. If the ambulance is traveling at 26.0 m/s (93.6 km/h or 58.2 mi

Norma-Jean [14]

To solve this problem it is necessary to apply the concepts related to the described wavelength through frequency and speed. Mathematically it can be expressed as:

$\lambda = \frac{v}{f}$

Where,

$\lambda =$ Wavelength

f = Frequency

v = Velocity

Our values are given as,

$f = 2.8*10^3Hz$

$v = 340m/s \rightarrow$ Speed of sound

Keep in mind that we do not use the travel speed of the ambulance because we are in front of it. In case it approached or moved away we should use the concepts related to the Doppler effect:

Replacing we have,

$\lambda = \frac{340}{2.8*10^3}$

$\lambda = 0.1214m$

Therefore the frequency that you hear if you are standing in from of the ambulance is 0.1214m

5 0

3 years ago

An irrigation canal has a rectangular cross section. At one point whare the canal is 16.0 m wide, and the water is 3.8 m deep, t

Irina-Kira [14]

Answer:

The depth of the water at this point is 0.938 m.

Explanation:

Given that,

At one point

Wide= 16.0 m

Deep = 3.8 m

Water flow = 2.8 cm/s

At a second point downstream

Width of canal = 16.5 m

Water flow = 11.0 cm/s

We need to calculate the depth

Using Bernoulli theorem

$A_{1}V_{1}=A_{2}V_{2}$

Put the value into the formula

$16.0\times3.8\times2.8=16.5\times x\times 11.0$

$x=\dfrac{16.0\times3.8\times2.8}{16.5\times11.0}$

$x=0.938\ m$

Hence, The depth of the water at this point is 0.938 m.

7 0

3 years ago

A gas is contained in a cylinder with a frictionless moveable piston at a pressure of 3.50 × 105 pascals and a volume of 0.02 cu

Softa [21]

W=PΔV

W=3.5 x 10⁵ x (0.15-0.02)

W=4.55 x 10⁴ J

3 0

2 years ago

A skydiver of mass m jumps from a hot air balloon and falls a distance d before reaching a terminal velocity of magnitude v. Ass

borishaifa [10]

Answer:

$W_{drag} = m\cdot g \cdot d - \frac{1}{2}\cdot m \cdot v^{2}$

Explanation:

Drag Force is the only nonconservative force that affects the system. According to the Principle of Energy Conservations and Work-Energy Theorem, the physical model for the skydiver is:

$U_{g,A} = U_{g,B} + K_{B} + W_{drag}$

The work done on the skydriver by the drag is:

$W_{drag} = U_{g,A}-U_{g,B}-K_{B}$

$W_{drag} = m\cdot g \cdot d - \frac{1}{2}\cdot m \cdot v^{2}$

5 0

3 years ago

If a negative charge is released in a uniform electric field move

Goryan [66]

Answer:

Explanation:

Let the electric field strength is E and the charge is q. The force experienced by the charge due to the presence of electric field is

F = q x E

The direction of force is same as that of the electric field strength if the charge is positive in nature and if the charge is negative in nature the direction of force is opposite to the direction of electric field.

8 0

3 years ago