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gladu [14]
3 years ago
6

A car starts from a stopped position at a red light. At the end of 30 seconds, its speed is 20 meters per second. What is the ac

celeration of the car?
A. 1.5 m/s
B. 0.7 m/s
C. 0.7 m/s 2
NEED help please HEELLPP
Physics
1 answer:
Gnoma [55]3 years ago
5 0
A=deltav/t
Vf=20m/s
Vi=0m/s
(20-0)/30
=0.667 m/s^2
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Answer:

(a) v_f=0.5\frac{m}{s}

(b) v_f=-11\frac{m}{s}

Explanation:

(a) Since a constant external force is applied to the body, it is under an uniformly accelerated motion. Using the following kinematic equation, we calculate the final velocity of the mass  if it is initially at rest(v_0=0):

v_f=v_0+at\\v_f=at(1)

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F=ma\\a=\frac{F}{m}(2)

Replacing (2) in (1):

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(b) In this case we have v_0=-11.5\frac{m}{s}. So, we use the final velocity equation:

v_f=v_0+at\\v_f=v_0+\frac{F}{m}t\\v_f=-11.5\frac{m}{s}+\frac{2.5N}{4.5kg}(0.9s)\\v_f=-11\frac{m}{s}

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Answer:

Considering a triangle like the one of the figures, you can obtain the total magnetic force applied on it like the addition of the forces applied to each of the 3 sides.

Been the magnetic force formula:

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For each segment:

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Segment 2 (from [a,0,0] to [0,a,0]):

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F=\int\limits^0_a {I} \, \overline {y}dx \times B \overline {z}=-IBa\overline {x}

Total force on the wire loop:

F_{T} =F_{1} +F_{2} +F_{3} =-IBa\overline {y}+IB2a(\overline {x}+\overline {y})-IBa\overline {x}=0N

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The best and most correct answer among the choices provided by your question is the third choice or letter C.
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