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SpyIntel [72]
3 years ago
6

Select the correct answer. An airplane is flying at a constant speed in a positive direction. It slows down when it approaches t

he airport where it's going to land. Which term describes the slowing of the plane?
A. stationaryB. positive velocityC. positive accelerationD. negative accelerationE. constant velocity
Physics
1 answer:
Triss [41]3 years ago
7 0

An airplane is flying at a constant speed in a positive direction. It slows down when it approaches the airport where it's going to land. this is an example of negative acceleration (D).

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turning on the television is a form of ___ energy that transforms into ___ energy and/or sound energy
MariettaO [177]
Electric energy into light energy and sound energy
8 0
3 years ago
Unless indicated otherwise, assume the speed of sound in air to be v = 344 m/s. A stationary police car emits a sound of frequen
bixtya [17]

Answer:

a) The velocity of the car is 7.02 m/s and the car is approaching to the police car as the frequency of the police car is increasing.

b) The frequency is 1404.08 Hz

Explanation:

If the police car is a stationary source, the frequency is:

f_{a} =(\frac{v+v_{c} }{v} )f_{s} (eq. 1)

fs = frequency of police car = 1200 Hz

fa = frequency of moving car as listener

v = speed of sound of air

vc = speed of moving car

If the police car is a stationary observer, the frequency is:

f_{L} =f_{a} (\frac{v}{v-v_{c} } )=(\frac{v+v_{c} }{v-v_{c} } )f_{s} (eq. 2)

Now,

fL = frequecy police car receives

fs = frequency police car as observer

a) The velocity of car is from eq. 2:

1250=1200(\frac{v+v_{c} }{v-v_{c} } )\\1250(v-v_{c} )=1200(v+v_{c} )\\v_{c} =\frac{50*344}{2450} =7.02m/s

b) Substitute eq. 1 in eq. 2:

f_{L} =(\frac{v+v_{p} }{v-v_{c} } )(\frac{v+v_{c} }{v-v_{p} } )f_{s} =(\frac{344+20}{344-7.02} )(\frac{344+7.02}{344-20} )*1200=1404.08Hz

7 0
3 years ago
A toy car goes over a small ramp at a horizontal velocity of 1.21 m/s and decelerates at 0.131 m/s2 while in the air. The total
xz_007 [3.2K]
We need to considerate only the horizontal component of the motion of the toy car.

The formula for the distance in a decelerated motion is:
s = s₀ + v₀·t - 1/2·a·t²

where:
s₀ = initial position = 0
v₀ = initial velocity = 1.21 m/s
t = time elapsed = 0.342 s
a = deceleration = 0.131 m/s²

Plugging in numbers:
s = 0 + 1.21×0.342 - 0.5×0.141×(0.342)²
  = 0.406 m

Hence, the toy car traveled a distance of about 41 cm.

3 0
3 years ago
Qué es el espectro electromagnético
Lynna [10]
Es el conjunto de longitudes de onda de todas las radiaciones electromagnéticas
5 0
3 years ago
Controlling the amount of current in a circuit by opposing the flow of charge
Vera_Pavlovna [14]

Answer:

Resistor

Explanation:

Resistor provides resistance to the flow of electric current in a circuit.

It controls the amount of current in a circuit by acting as a barrier to the flow of electric charges

8 0
3 years ago
Read 2 more answers
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