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When a metal ball is weighed in air, the reading of the spring scale is 14.7n. When it is weighed in water, the reading of the spring scale is 14.7n When a metal ball is weighed in air, the reading of the spring scale is 14.7n, and when it is immersed in water, the reading of the spring scale is 4.9n. Ask: what is the volume of the metal ball? What is the density of the metal ball?
It is known that: G ball = 14.7n, f pull = 4.9n, ρ water = 1000kg / m3, g = 9.8n/kg
(1) v-ball = (2) ρ-ball = (3)?
(1) f float = G-F pull
Ψ f = 14.7n-4.9n
=9.8N
And ∵ f = g row
=ρ liquid GV discharge
Ψ V row = f float / ρ water G
=0.001m3
The metal ball is submerged in water
Ψ V ball = V row = 0.001m3
⑵∵G=mg
｜ m-ball = g-ball / g
=1.5kg
And ∵ ρ = m / v
ρ = 1.5kg/0.001m3
=1500kg/m3
A: the volume of metal ball is 0.001m3, and the density is 1500kg / m3
Weigh something in air 10.8n, immerse it in water 6.8 to find the density of the object. (g = 10N / kg)
m=1.08 Kg
F = 4N
V=4*10^(-4)m^3
P=m/V=2.7*10^3
Ask me if you don't understand
The weighing range of a spring scale is 0 to 50N. Xiao Ming didn't pay attention to the weighing range of the spring scale and used the spring scale to weigh an object
The weighing range of a spring scale is 0-50n. Xiaoming didn't pay attention to the weighing range of the spring scale. He weighed an object with the spring scale. After taking the object, he found that the spring didn't return to its original state. What is the gravity range of the object?
Please write down the process
The answer is: greater than 50N
No one can figure out exactly how much
Because the force greater than the maximum range will straighten the spring, it will not spring back
So we can only know that it is greater than 50N
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