A 10N cylinder sinks in water, diameter is 2m, calculate its cross-sectional area.
1×π
2×π
4×π
8×π
condition is not enough
A 10N cylinder sinks in water, density of water is 1000 kg/m3, calculate its volume.
10÷1000
10÷g÷1000
1÷g÷1000
1×π÷g÷1000
condition is not enough
A 10N cylinder sinks in water, volume of the cylinder is 0.001 m3, calculate its height.
0.001÷2
0.001÷1×π
0.001÷1÷π
0.001×1×π
condition is not enough
A 10N cylinder sinks in water, its height is 3.2×10-4m. Calculate the pressure at the bottom of cylinder.
ρ×g×3.2×10-4
ρ×3.2×10-4
g×3.2×10-4
1×π×g×3.2×10-4
condition is not enough
A 10N cylinder sinks in water, its height is 3.2×10-4m. Calculate the pressure difference at the bottom and top of cylinder.
ρ×g×3.2×10-4
ρ×3.2×10-4
g×3.2×10-4
1×π×g×3.2×10-4
condition is not enough
A 10N cylinder sinks in water, and pulled by a string. choose the correct formula with tension on string, weight, upthrust.
tension=weight
upthrust=weight
tension+upthrust=weight
tension+weight=upthrust
tension=weight+upthrust
一个悬挂砝码的弹簧，弹簧受到的拉力和伸长量如图所示。What is the slpoe of this line?
1/k
k
F
x
Calculate the spring constant k.（所有的填空题不要写分数，不要写单位）
The name of the point X is limit of ( ).
Assume all springs are identical, which combination has the largest spring constant?
A
B
C
D
all the same
How much work is done to increase the extension of the wire to 3.0mm?
If the wire is already extened by 60N force, how much work is done to increase the extension of the wire by 2.0mm?
What is the unit of Young modulus? 不要大写
The Young modulus is not related to which one of following
cross-section area
extension
unstretched length
final length
calculate the strain of the cord?保留一位小数
Calculate the stress in the wire. 有几个零就写几个零，不要写科学计数法
对于两个材料相同初始长度相同的物体AB，如果物体AB的横截面直径之比为2:1，如果使用相同的力去拉伸这两个物体，请问他们的伸长量之比为多少？
1:4
4:1
2:1
1:2
1:1
不要写分数，写小数或者整数