Answer:
= 2/3
Explanation:
The yuong modulus of a rod is defined as the relationship between the tensile strength and the strain
Y =
let's use the subscript "o" for rod A
I =
tells us that rod B has
A = 3 A₀
L = 2 L₀
we substitute
Y =
Y =
y = ⅔
substituting the value of Y₀
Y = ⅔ Y₀
= 2/3
Answer:
No, the ride is not safe
Explanation:
From the diagram attached, it is seen that

................(1)

.......(2)

From the diagram, 


............(3)
Put (3) into (2)


w = weight of chair + weight of child = 50 + 10 = 60 lb
g = 32 ft/s²
m = w/g = 60/32 = 1.875
L = 30 ft
T = 3 secs


since 246.74 lbs > 200 lbs, it is not safe because the stationary chair will creak
Answer:

Explanation:
Since the package remains in contact with the car's seat, the package's speed is equal to the car's speed. At the top on the mountain the package's centripetal force must be equal to its weight:

The centripetal force is defined as:

Here v is the linear speed of the object and r is the radius of curvature. We need to convert the linear speed to
:

Now, we calculate r:

<span>The answer is 4, 6 and 7. Gas and plasma share most similar properties. The difference lies in the fact that plasma is composed of ions and electrons (ionized gas) as opposed to gas that is composed of neutral molecules. Therefore plasma can conduct electricity while gas cannot. </span>
Answer:
a = 1.05m.s²
Explanation:
Fnet = m×a
Fapplied - friction = m×a
1172 - 962 = 200 × a
210 = 200a
a = 1.05