PHYSICS HIGH SCHOOL

10Two blocks A and B are joined by a string and rest on a frictionless horizontal table. A force a
200N is applied horizontally on block B.
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A
Draw free-body diagrams for both boxes.
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B
200 N
10 Two blocks A and B are joined by a - 1

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If you had two forces, one with a magnitude of 25 N and the other with a magnitude of 100N, what would be the maximum net force these forces could exert on an object? How would these forces have to be applied in order to exert this maximum net force?

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Two force yield a maximum effectwhen in the same direction.

When they are in the same direction, they can be added : the resulting force will be 100+25=125 N

A demographic tool used to predict a population's future growth isChoose one answer.
a. a hairline growth curve.
b. demographic transition.
c. age structures.
d. maximum sustained growth.
e. population momentum

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C. Age structure. Hope I helped :) 

If the velocity of a body changes from 13 m/s to 30 m/s while undergoing constant acceleration, what's the average velocity of the body? A. 28 m/s
B. 17 m/s
C. 21.5 m/s
D. 19.5 m/s

Answers

Since the acceleration is constant, the average velocity is simply the average of the initial and final velocities of the body:

v_(avg) = (v_f+v_i)/(2)=(30 m/s+13 m/s)/(2)=21.5 m/s

We can proof that the distance covered by the body moving at constant average velocity v_(avg) is equal to the distance covered by the body moving at constant acceleration a:

- body moving at constant velocity v_(avg): distance is given by

S=v_(avg)t = (v_f+v_i)/(2)t

- body moving at constant acceleration a=(v_f-v_i)/(t): distance is given by

S=v_i t+ (1)/(2)at^2 = v_i t + (1)/(2)(v_f-v_i)/(t)t^2=(v_i+(1)/(2)(v_f-v_i))t=(v_f+v_i)/(2)t
The answer is 21.5 m/s

Which of the following could be a potential safety hazard of indoor recreation?a. slippery rocks and loose gravel
b. flash floods
c. traveling without a compass, map, or GPS
d. a liquid spill on the floor that was not cleaned

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d. a liquid spill on the floor that was not cleaned could be a potential safety hazard of indoor recreation

A liquid spill on the floor that was not cleaned could be a potential safety hazard of indoor recreation.

NOT:

a. slippery rocks and loose gravel
b. flash floods
c. traveling without a compass, map, or GPS

Answer:

THE ANSWER IS D

Explanation:

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That's called the "normal" to the surface at that point.

What must exist for electric charges to flow?

Answers

Answer:electric potential difference

Explanation:
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