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ValentinkaMS [17]
4 years ago
17

Speed is an important component of which of the following sports? A. tennis B. soccer C. swimming D. all of the above Please sel

ect the best answer from the choices provided. A B C D
Physics
2 answers:
sladkih [1.3K]4 years ago
7 0

D. all of the above

Explanation:

The best answer from the choices is option D all of the above.

Speed is a key component aspect of almost all sport.

What is speed:

Speed is the rate of change of distance with time;

 Speed = \frac{distance}{time}

distance is the path taken by a body

time is the duration of interval

In tennis, speed is very essential and critical same as soccer and swimming. In fact, sports with more speed have very good advantage at excelling.

learn more:

Speed brainly.com/question/10435836

#learnwithBrainly

beks73 [17]4 years ago
3 0

Answer: D. all of the above

Explanation:

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Three observers watch a train pull away from a station toward the right of the platform. Observer A is in one of the train’s car
blagie [28]

Describing motion from each frame of reference:

Since observer A is on one of the train's cars, he will find that he is at rest with respect to the train even when it is pulling away because,  he is also moving with respect to the train.

Observer B on the stationary platform will observe that the train is pulling away from the station towards the right of the platform. as is described


Observer C will notice that the train is approaching him in the opposite direction at a speed which is the sum of the speeds at which both the train are traveling


If the conductor applies brakes on the train, since the platform is a stationary frame of reference. The motion will be observed as a simple decelerationg. he will observe that the force due to the brakes will cause the velocity of the train with respect to the train to decrease


Universal law of gravitation effects all objects alike . There will be a constant force of gravity acting on the train that will keep the train on its tracks. The tracks in turn exert a reaction force on the train. There will not be any affect on the train's motion as such( assuming that the train is moving along the tracks and gravitational force is exactly perpendicular)

3 0
3 years ago
To test the strength of a retainment wall designed to protect a nuclear reactor,
Hatshy [7]

Answer:

The speed of the F-4 Phantom upon impact is approximately 214.92 m/s

Explanation:

The given parameter of the motion of the F-4 Phantom jet aircraft are;

The mass of the F-4 phantom rocket, m₁ = 19,100 kg

The mass of the retaining wall, m₂ = 469,000 kg

The velocity of the combined mass of the wall and the F-4 after collision, v₃ = 8.41 m/s

The retainment wall was initially at rest, therefore, v₂ = 0 m/s

Let 'v₁', represent the speed of the F-4 Phantom upon impact

By the principle of conservation of linear momentum, we have;

m₁·v₁ + m₁·v₂ = m₁·v₃ + m₂·v₃ = (m₁ + m₂)·v₃

Plugging in the values, we have;

19,100 × v₁ + 469,000 × 0  = (19,100 + 469,000) × 8.41

∴ v₁ = (19,100 + 469,000) × 8.41/(19,100) = 214.917329843

v₁ ≈ 214.92

The speed of the F-4 Phantom upon impact, v₁ ≈ 214.92 m/s.

6 0
3 years ago
The only drawback to solar energy is that it
MA_775_DIABLO [31]
It is to highly priced for most of civilization.
3 0
3 years ago
POTENTIAL I KINETIC ENERGY
TEA [102]

7kinetic energy is decreasing in B

4 0
2 years ago
An airplane in the earth’s magnetic field can develop a voltage between its wingtips.
Svetradugi [14.3K]

Answer:

emf=0.125\ V

According to the Fleming's Left left hand rule we have higher potential on the right edge of the wing.

Explanation:

Given:

  • velocity of plane, v=250\ m.s^{-1}
  • magnetic field, B=5\times 10^{-5}\ T
  • angle between velocity and magnetic field, \theta=30^{\circ}
  • span of the wing, l=20\ m

We know:

emf=B.l.v\ sin\theta

emf=5\times 10^{-5}\times 20\times 250\times sin30^{\circ}

emf=0.125\ V

According to the Fleming's Left left hand rule we have higher potential on the right edge of the wing.

7 0
3 years ago
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