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posledela
3 years ago
14

an air craft is travelling due north with velocity of 100m/s astrong wind blow from the west with in velocity of 25m/s the reshs

tant velocity​
Physics
1 answer:
OleMash [197]3 years ago
8 0

Explanation:

The aircraft is traveling north at 100 m/s.

The wind blows from the west (towards the east) at 25 m/s.

The two vectors form a right triangle.  The magnitude of the resultant velocity can be found with Pythagorean theorem:

v² = vx² + vy²

v² = (25 m/s)² + (100 m/s)²

v = 103 m/s

The direction can be found with trigonometry:

θ = atan(vy / vx)

θ = atan(100 / 25)

θ = 76.0°

The resultant velocity is 103 m/s at 76.0° north of east.

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A 2.3 kg block slides along a frictionless
Stels [109]

Answer:

The block slides <u>2.1 m</u> up the ramp before coming momentarily to rest

Explanation:

Let the maximum height reached by the block be 'h' m.

Given:

Mass of the block is 2.3 kg.

Initial velocity of the block is, u=5.3\ m/s

Since, the block comes momentarily to rest, the final velocity is zero.

Final velocity at the maximum height of the ramp is, v=0

Acceleration due to gravity is, g=9.8\ m/s^2

Angle of inclination is, \theta=43\°

Now, since all the surfaces are frictionless, we can apply law of conservation of energy.

Therefore, as per conservation of energy,

Decrease in kinetic energy = Increase in potential energy

\frac{1}{2}m(u^2-v^2)=mgh\\\frac{1}{2}(5.3^2-0)=(9.8)h\\9.8h=\frac{28.09}{2}\\h=\frac{28.09}{2\times 9.8}=1.43\ m

The maximum height reached by the block is 1.43 m. Now, the distance traveled along the ramp is the hypotenuse.

The hypotenuse length of the block along the ramp is given as:

L=\frac{h}{\sin \theta}\\\\L=\frac{1.43}{\sin 43\°}\\L=2.1\ m

Therefore, the block slides 2.1 m up the ramp before coming momentarily to rest.

6 0
3 years ago
Please do it to me thank alot
faltersainse [42]

Answer:

See explanations below

Explanation:

For resistors in series, the will be added for those in parallel, we will take the sum of their reciprocal

A) 3 2ohms resistors in series

Equivalent resistance = 2 + 2 + 2

Equivalent resistance = 6ohms

B) 2 4 ohms resisstors in parallal

1/R = 1/4 + 1/4

1/R = 2/4

R = 4/2

R = 4ohms

Equivalent resistance is 2ohms

C) 4 ohms with in series with 8ohms = 4 + 8

Equivalent resistance = 4 + 8

Equivalent resistance = 12ohms

D) 4 ohms and 2 ohms in parallel is expressed as;

1/R = 1/4 + 1/2

1/R = 1+2/4

1/R = 3/4

R = 4/3

4/3 ohms in series with 6ohms

Equivalent resistance = 4/3 + 6

Equivalent resistance =4+18/3

Equivalent resistance = 22/3 ohms

8 0
3 years ago
Why do we measure volume
Misha Larkins [42]

Explanation:

Volume is often quantified numerically using the SI derived unit, the cubic metre. The volume of a container is generally understood to be the capacity of the container; i. e., the amount of fluid (gas or liquid) that the container could hold, rather than the amount of space the container itself displaces.

We don't use units like triangular prism feet or spherical kilometers because the three axes don't make a "corner" of any other shape other than a cube.

Glad I was able to help!!

7 0
3 years ago
Read 2 more answers
A 120-kg roller coaster cart is being tested on a new track, and a crash-test dummy is loaded into itThe roller coaster starts f
Black_prince [1.1K]

Answer:

a) variation of the energy is equal to the work of the friction force

b) W = Em_{f} -Em₀ ,  c) he conservation of mechanical energy

Explanation:

a) In an analysis of this problem we can use the energy law, where at the moment the mechanical energy is started it is totally potential, and at the lowest point it is totally kinetic, we can suppose two possibilities, that the friction is zero and therefore by equalizing the energy we set the velocity at the lowest point.

 Another case is if the friction is different from zero and in this case the variation of the energy is equal to the work of the friction force, in value it will be lower than in the calculations.

b) the calluses that he would use are to hinder the worker's friction force and energy

          W = Em_{f} -Em₀

          N d = ½ m v² - m g (y₂-y₁)

          y₂-y₁ = 35 -10 = 25m

c) if there is no friction, the physical principle is the conservation of mechanical energy

 If there is friction, the principle is that the non-conservative work is equal to the variation of the energy

7 0
3 years ago
A substance has a volume of 4,000 cm and a mass that is 2,000 g. What is the density of the substance.
podryga [215]
Density is mass divided by volume making the answer 0.5 g/cm^3
5 0
3 years ago
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