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creativ13 [48]
3 years ago
15

A vector has a magnitude of 46.0 m and points in a direction 20.0° below the positive x-axis. A second vector, , has a magnitude

of 86.0 m and points in a direction 42.0° above the negative x-axis. a) Sketch the vectors A⃗ , B⃗ , and C⃗=A⃗+B⃗ .
b) Using the component method of vector addition, find the magnitude of the vector C⃗ .
c) Using the component method of vector addition, find the direction of the vector C

Physics
1 answer:
irina1246 [14]3 years ago
6 0

Answer with Step-by -step explanation:

We are given that

b.\mid A\mid=46 m

\theta=20^{\circ} below the positive x-axis

Therefore, the angle made by vector A in counter clockwise direction when measure from positive x-axis=x=360-20=340^{\circ}

x-component of vector A=A_x=\mid A\mid cosx=46cos 340=46\times 0.94=43.24

y-Component of vector A=A_y=\mid A\mid sinx=46sin340=46(-0.34)=-15.64

Magnitude of vector B=86 m

The vector B makes angle with positive x- axis=x'=42^{\circ}

x-component of vector B=B_x=86cos42=63.64

y-Component of vector B=B_y=86sin42=57.62

Vector A=A_xi+A_yj=43.24i-15.64j

Vector B=B_xi+B_yj=63.64i+57.62j

Vector C=A+B

Substitute the values

C=43.24i-15.64j+63.64i+57.62j

C=106.88i+41.98j

c.Direction=\theta=tan^{-1}(\frac{y}{x})=tan^{-1}(\frac{41.98}{106.88})=21.5^{\circ}

The direction of the vector C=21.5 degree

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Two swimmers A and B, of weight 190 lb and 125 lb, respectively, are at diagonally opposite corners of a floating raft when they
Harrizon [31]

Answer:

a) 0.618 ft/s

b) 3.04 ft/s

Explanation:

<u>Givens:</u>

Weight of swimmer A W_{A} = 190 Ib.

Weight of swimmer B  W_{B}= 125 Ib.

Weight of the raft W_{R} = 300 Ib.  

Swimmer A walks toward swimmer B relative to the raft with a speed

V_{A/R}= 2 ft/s

<em>a)</em><em> Conservation of linear momentum </em>

m_{A} v_{A} +m_{B} v_{B} +m_{R} v_{R} =0..........(1)\\v_{A/R}=v_{A}  -v_{R}\\\v_{A}=v_{A/R}+v_{R}.................(2)

Since swimmer B does not move  

v_{B} =v_{R}...............(3)

Substitute from (2) and (3) into (1)

m_{A} (v_{A/R} +v_{R} )+m_{B} v_{R} +m_{R} v_{R}=0\\(m_{A}+m_{B}+m_{R})v_{R} =-m_{A}v_{A/R}\\v_{R}=\frac{-m_{A}v_{A/R}}{m_{A}+m_{B}+m_{R}} \\v_{R}=0.618ft/s

b) if the raft not to move v_{R}=0

from (2)

v_{A} =v_{A/R}

substitute in (1)

m_{A} v_{A/R} +m_{B} v_{B}+m_{R} (0)=0\\v_{B}=\frac{W_{A}v_{A/R}}{W_{B}} \\v_{B}=3.04ft/s

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17. Suppose you attach the object with mass m to a vertical spring originally at rest, and let it bounce up and down. You releas
insens350 [35]

Answer:

See below ↓

Explanation:

<u>Step 1 : Diagram</u>

  • In attachment

<u>Step 2</u>

  • We choose the system to be the spring, the block, and the Earth and it is isolated
  • We put all the data in the figure we have created and create a zero level (initial height) of the block to be yₓ = 0 and the final position, when it stops and moves upwards again, to be yₙ = -A
  • No external forces are exerted on the system and no energy comes in or out of the system
  • Hence,

⇒ ΔE = 0

⇒ Eₙ - Eₓ = 0

⇒ Eₙ = Eₓ

⇒ Kₙ + Uₙ + Pₙ = Kₓ + Uₓ + Pₓ

  • Final kinetic energy is 0 at the lowest point

⇒ Uₙ + Pₙ = Uₓ + Pₓ

<u>Step 3</u>

  • Initial potential energy is 0 [zero level = initial height]

⇒ Uₙ + Pₙ = Uₓ

  • And we know that spring was originally at normal length, so initial spring energy is also 0

⇒ Uₙ + Pₙ = 0

⇒ 1/2kxₙ² + mgyₙ = 0

⇒ 1/2kxₙ² = -mgyₙ

  • We know xₙ = A and yₙ = -A from the diagram

⇒ 1/2kA² = -mg(-A)

⇒ 1/2kA² = mgA

⇒ [1/2kA = mg]

<u>Step 4</u>

  • Spring force is given by : F = -kx
  • Note : x = A

⇒ F = kA

⇒ k = F/A

⇒ Plug 'k' into the equation found at the end of Step 3

⇒ 1/2(F/A)(A) = mg

⇒ 2F = mg

⇒ F = 2mg (a)

<u>Step 5</u>

  • We know the spring will stop oscillating and be at rest at the new equilibrium position of the system

⇒ F - mg = 0

⇒ F = mg

  • We know that :

⇒ F = -kx

  • In the case x = yₙ

⇒ kyₙ = mg

⇒ yₙ = mg/k

⇒ yₙ = 0.25 x 9.8 / -10

⇒ yₙ = -0.245 m

⇒ yₙ = A

⇒ yₙ = 0.245 m (b)

<u>Step 6</u>

  • v(max) = Aω
  • v(max) = A√k/m
  • v(max) = 0.245 x √(10/0.25)
  • v(max) = 1.55 m/s (c)

8 0
2 years ago
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