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3 years ago

Help please, It's for science :>

Physics

2 answers:

tekilochka [14]3 years ago

8 0

Help on what I don’t so anything?

xenn [34]3 years ago

3 0

Answer:

he tail of the arrow moves a distance of 0.5 m as the arrow is shot. yare yare daze

Explanation:

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The difference in emf between the primary coil of a transformer and the secondary coil is directly related to the relative numbe

Vika [28.1K]

Wellllll ... to be perfectly and honestly technical about it, it's the RATIO of the emf, not the difference.

6 0

3 years ago

A concert loudspeaker suspended high off the ground emits 32.0 W of sound power. A small microphone with a 1.00 cm^2 area is 52.

lesya [120]

Answer:

Sound Intensity at microphone's position is $9.417\times 10^{- 4} W/m^{2}$

The amount of energy impinging on the microphone is $9.417\times 10^{- 8} W/m^{2}$

Solution:

As per the question:

Emitted Sound Power, $P_{E} = 32.0 W$

Area of the microphone, $A_{m} = 1.00 cm^{2} = 1.00\times 10^{- 4} m^{2}$

Distance of microphone from the speaker, d = 52.0 m

Now, the intensity of sound, $I_{s}$ at a distance away from the souce of sound follows law of inverse square and is given as:

$I_{s} = \frac{P_{E}}{Area} = \frac{P_{E}}{4\pi d^{2}}$

$I_{s} = \frac{32.0}{4\pi (52.0)^{2}} = 9.417\times 10^{- 4} W/m^{2}$

Now, the amount of sound energy impinging on the microphone is calculated as:

If $I_{s}$ be the Incident Energy/ $m^{2}/s$

Then

The amount of energy incident per 1.00 $cm^{2} = 1.00\times 10^{- 4} m^{2}$ is:

$I_{s}(1.00\times 10^{- 4}) = 9.417\times 10^{- 4}\times 1.00\times 10^{- 4} = 9.417\times 10^{- 8} J$

7 0

3 years ago

Suppose you designed a spacecraft to work by photon pressure. The sail was a completely absorbing fabric of area 1.0 km2 and you

Alekssandra [29.7K]

Answer:

(a) F = 6.14 *10⁻⁴ N

(b) P = 6.14* 10⁻¹⁰ Pa

Explanation:

Area of sail A = 1.0 km² = 1.0 * 10⁶m²

Wavelength of light λ = 650 nm = 650 * 10⁻⁹ m

Rate of impact of photons R = 1 mol/s = 6.022 * 10²³ photons/s

(a)

Momentum of each photon is Ρ = h/λ = 6.625 * 10⁻³⁴ / 650 * 10⁻⁹

= 1.0192 * 10⁻²⁷ kg.m/s

Since the photons are absorbed completely, in every collision the above momentum is transferred to the sail.

Momentum transferred to the sail per second is product of rate of impact of photons and momentum transferred by each photon.

dp/dt = R * h/ λ

This is the force acting on the sail.

F = R * h/λ = 6.022 * 10²³ * 1.0192 * 10⁻²⁷ = 6.14 *10⁻⁴ N

F = 6.14 *10⁻⁴ N

Pressure exerted by the radiation on the sail = Force acting on the sail / Area of the sail

P = F/A = 6.14 * 10⁻⁴ / 1.0 * 10⁶ = 6.14* 10⁻¹⁰ Pa

P = 6.14* 10⁻¹⁰ Pa

Acceleration of spacecraft a = F/m = 6.14 * 10⁻⁴ /1.0 = 6.14 * 10⁻⁴m/s²

As the spacecraft starts from rest, initial speed u=0,m/s ,

final speed is u = 1.0 m/s after time t

v = u+at

t = 1.0 - 0/ 6.14 * 10⁻⁴ = 1629s = 27.2 min

t = 27.2 min

4 0

4 years ago

A beach ball is rolling in a straight line toward you at a speed of .5 meters per second. It's momentum is .25 kgxm/sec what is

stepladder [879]

Its 15 pounds (ilb) i think

4 0

3 years ago

A scientist observed the formation of hundreds of maggots and many flies on a rotting meat slice exposed to the environment. Wha

Phantasy [73]

Female flies are the one that are saddle with the responsibility of laying eggs during reproduction. The female usually look for a warm and moist place that have abundance food source for laying the eggs. The eggs laid by by the flies transformed into larva, which is also called maggots and the maggots turn into flies.

8 0

4 years ago