百度作业网200分求数学题 求过程
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200分求数学题 求过程
A block of steel on a level, frozen pond, is given an initial speed V. Even though the block of steel is
sliding on smooth ice, there will be a small friction force that will slow the block of steel until it
comes to a stop. Assume that the distance, d, the block travels is directly proportional to the
square of V. When V = 4 feet per second, d = 32 feet. Find the distance the block travels if the
initial speed is 10 feet per second.
答案为200feet 求过程
A block of steel on a level, frozen pond, is given an initial speed V. Even though the block of steel is
sliding on smooth ice, there will be a small friction force that will slow the block of steel until it
comes to a stop. Assume that the distance, d, the block travels is directly proportional to the
square of V. When V = 4 feet per second, d = 32 feet. Find the distance the block travels if the
initial speed is 10 feet per second.
答案为200feet 求过程
Assume that the distance,d,the block travels is directly proportional to the
square of V
译为,d和V^2成正比,
即d/V^2的值是一常数
已知V=4,d=32
要知道V=10的时候,d=?
d/V^2=d/V^2
左边是V=10,d未知
右边是V=4,d=32
即d/10^2=32/4^2
d/100=32/16=2
d=100*2=200 feet
square of V
译为,d和V^2成正比,
即d/V^2的值是一常数
已知V=4,d=32
要知道V=10的时候,d=?
d/V^2=d/V^2
左边是V=10,d未知
右边是V=4,d=32
即d/10^2=32/4^2
d/100=32/16=2
d=100*2=200 feet