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irmaespinoza76ie
30.11.2019 •
Physics
A44.0 kg uniform rod 4.90 m long is attached to a wall with a hinge at one end. the rod is held in a horizontal position by a wire attached to its other end. the wire makes an angle of 30.0° with the horizontal, and is bolted to the wall directly above the hinge. if the wire can withstand a maximum tension of 1450n before breaking, how far from the wall can a 69.0kg person sit without breaking the wire?
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Ответ:
x ≤ 3.6913 m
Explanation:
Given
Mrod = 44.0 kg
L = 4.90 m
Tmax = 1450 N
Mman = 69 kg
A: left end of the rod
B: right end of the rod
x = distance from the left end to the man
If we take torques around the left end as follows
∑τ = 0 ⇒ - Wrod*(L/2) - Wman*x + T*Sin 30º*L = 0
⇒ - (Mrod*g)*(L/2) - (Mman*g)*x + Tmax*Sin 30º*L = 0
⇒ - (44*9.8)*(4.9/2) - (69*9.8)*x + (1450)*(0.5)*(4.9) = 0
⇒ x ≤ 3.6913 m
Ответ:
Marte, Júpiter, Saturno, Urano y Neptuno.
Explanation:
Marte tiene 2 lunas, Júpiter tiene 62 lunas, Saturno tiene 33 lunas, Urano tiene 27 lunas y Neptuno tiene 13 lunas.