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makvit [3.9K]
2 years ago
13

A car makes a trip due north for three-fourths of the time and due south one-fourth of the time. The average northward velocity

has a magnitude of 45 m/s, and the average southward velocity has a magnitude of 37 m/s. Taking northward to be the positive direction, what is the average velocity for the trip?
Physics
1 answer:
jekas [21]2 years ago
3 0

Answer:

v = 24.5 m

Explanation:

Average speed is defined as

       v = (x_{f} - x₀) / t

The distance is

        x = v t

In this case we can find the speed

       v = (v_nort ¾ t + v_sud ¼ t) / t

        v = 45 ¾ - 37 ¼

        v = 24.5 m

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car is moving at 40 m/s. At 10 meters the driver spots a deer on the road and instantly steps on the brakes. If the car is 400 k
Mice21 [21]

Answer:

32000 N

Explanation:

From the question given above, the following data were obtained:

Initial velocity (u) = 40 m/s

Distance (s) = 10 m

Final velocity (v) = 0 m/s

Mass (m) of car = 400 Kg

Force (F) =?

Next, we shall determine the acceleration of the the car. This can be obtained as follow:

Initial velocity (u) = 40 m/s

Distance (s) = 10 m

Final velocity (v) = 0 m/s

Acceleration (a) =?

v² = u² + 2as

0² = 40² + (2 × a × 10)

0 = 1600 + 20a

Collect like terms

0 – 1600 = 20a

–1600 = 20a

Divide both side by –1600

a = –1600 / 20

a = –80 m/s²

The negative sign indicate that the car is decelerating i.e coming to rest.

Finally, we shall determine the force needed to stop the car. This can be obtained as follow:

Mass (m) of car = 400 Kg

Acceleration (a) = –80 m/s²

Force (F) =?

F = ma

F = 400 × –80

F = – 32000 N

NOTE: The negative sign indicate that the force is in opposite direction to the motion of the car.

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2 years ago
After the terrorist attacks of September 11th, 2001, the National Center on the Psychology of Terrorism was founded to research
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A particle in a magnetic field is found to has zero magnetic force on it. Which situation is impossible to happen?​
Eva8 [605]

Answer:

Explanatim confused

7 0
2 years ago
A pair of slits, separated by 0.150 mm, is illuminated by light having a wavelength of λ = 643 nm. An interference pattern is ob
kumpel [21]

Answer:

0.006 m

Explanation:

d = separation between the slits = 0.150 mm = 0.150 x 10⁻³ m

λ = wavelength of the light = 643 nm = 643 x 10⁻⁹ m

D = distance of the screen where interference pattern is observed = 140 cm = 1.40 m

δ = Path difference

Path difference is given as

δ = Dλ/d

δ = (1.40) (643 x 10⁻⁹)/(0.150 x 10⁻³)

δ = 0.006 m

3 0
3 years ago
If a wire carrying current causes the needle of a compass to move:
Alecsey [184]

Answer:

D. it demonstrates electromagnetism.

Explanation:

If a wire carrying current causes the needle of a compass to move, it is an example of electromagnetism.

The interaction between electric and magnetic fields is termed electromagnetism.

  • Electromagnetic interaction is usually induced between a wire and bar magnet.
  • With right set up magnetic and electrical fields can be induced using a magnet and current carrying wire.
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