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VikaD [51]
3 years ago
14

When the point of reference (the observer) is in motion, it flips the "rules" of vector addition (you ADD the vectors going in o

pposite directions, and SUBTRACT vectors going in the same direction).
True
False
Physics
1 answer:
KengaRu [80]3 years ago
3 0

Answer:

the statement is TRUE

Explanation:

When we move in the same direction, the relative speed of the two vehicles is lower, so we must subtract their speeds, if the result is positive the vehicles approach and if it is negative they move away.

      v_relative = v₁ - v₂

When the two vehicles go in opposite directions, the speed is much higher, so we must add their speeds

     v_relative = v₁ - (-v₂))

     v_relative = v₁ + v₂

therefore the statement is TRUE

You might be interested in
a sound wave is determined to have a frequency of 1,000 hz and wavelength of 35cm. what is the speed of this wave?
natulia [17]

Answer:

The speed of the sound wave is 350 ms^{-1}

Explanation:

Given

Frequency of sound wave = 1000Hz = 1000s^{-1} (since 1 s^{-1} = 1 Hertz (Hz))

Wavelength of sound wave = 35 cm

Speed of sound wave = ?

All waves have same the relation among frequency, sound and speed which is given by

v=fλ , where

v is the speed

f is frequency

λ is wavelength

Therefore, the speed of sound wave = 1000s^{-1} x 35 cm

                                                              = 35000 cms^{-1}

                                                              = 350 ms^{-1}

Hence the speed of the sound wave is 350 ms^{-1}

3 0
4 years ago
light traveling through air encounters a second medium which slows the light to 100,000 miles/second. What is the index of the s
IceJOKER [234]

Answer:

300000 hope it is help full

Explanation:

300000

6 0
2 years ago
Read 2 more answers
Lauryn serves a volleyball with a mass of 2.1 kg. The ball leaves her hand with a speed of 30 m/s.
Naya [18.7K]

Hi! Let's see.

<h3><u>TOPIC: Kinetic Energy.</u></h3>

Explanation:

Data:

  • Mass(m) = 2.1 kilograms
  • Speed(v) = 30 m/s
  • Kinetic Energy(Ek) = ?

==================================================================

Use the kinetic energy formula:

  • \boxed{\boxed{\bold{E_{k}=\frac{m*(v)^{2}}{2}}}}

Replace by the data:

  • \boxed{E_{k}=\frac{2.1kg*(30\frac{m}{s})^{2}}{2}}}}}

We multiply speed squared:

  • \boxed{E_{k}=\frac{2.1kg*900\frac{m}{s}}{2}}}

Multiply in the numerator, without forgetting the units:

  • \boxed{E_{k}=\frac{1890J}{2}}}}

Both numerator and denominador operations are divided:

  • \boxed{\bold{E_{k}=945\ J}}

Answer: The kinetic energy is <u>945 Joules.</u>

Cordially Alejanndraax. Greetings!

8 0
3 years ago
At a distance r1 from a point charge, the magnitude of the electric field created by the charge is 395 N/C. At a distance r2 fro
Ksenya-84 [330]

Answer:

r₂/r₁ = 1.82

Explanation:

The electric field due to a point charge, has the following expression:

E =\frac{k*q}{r^{2}}

For a distance r₁, the magnitude of the electric field is 395 N/C, so we can solve for r₁², as follows:

r₁² = \frac{k*q}{395 N/C} } (1)

For a distance r2, the magnitude of the electric field is 119 N/C, so we can solve for r₂², as follows:

r₂² = \frac{k*q}{119 N/C} }

We can find the quotient r₂/r₁, from (1) and (2):

r₂/r₁ =\sqrt{395/119} = 1.82

7 0
4 years ago
2001240Determine the specific kinetic energy of a mass whose velocity is 40 m/s, in kJ/kg.
guapka [62]

Answer:

The specific kinetic energy of a mass is 0.8 kJ/kg

Explanation:

Given that,

Velocity = 40 m/s

Specific kinetic energy is the kinetic energy per unit mass.

We need to calculate the specific kinetic energy

Using formula of specific kinetic energy

K.E=\dfrac{\dfrac{1}{2}mv^2}{m}

K.E=\dfrac{v^2}{2}

Put the value into the formula

K.E=\dfrac{40^2}{2}

K.E=800\ J/kg

We know that,

1 kJ = 1000 J

or, 1J=0.001 KJ

The specific energy is

K.E=800\times0.001

K.E=0.8\ kJ/kg

Hence, The specific kinetic energy of a mass is 0.8 kJ/kg

6 0
3 years ago
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