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提问人：网友lixin080108
发布时间：2022-02-17
[主观题]
初速度（initial velocity）
简答题官方参考答案
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酶促反应最初阶段底物转化为产物的速度，这一阶段产物的浓度非常低，其逆反应可以忽略不计。
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更多“初速度（initial velocity）”相关的问题
第2题
As shown, a cannonball with mass m is fired with i...
As shown, a cannonball with mass m is fired with initial velocity
and emission angle
. The air resistance is proportional to the cannonball velocity, i.e.,
, where
is a constant. The differential equation of motion of the cannonball can be
A、
B、
C、
D、
第3题
An object is thrown up with an initial speed [图],...
An object is thrown up with an initial speed
, the air resistance is
, where m is the mass of the object and k is a constant, what are (1) the maximum height the object can reach, and (2)the magnitude of the velocity when the object returns the Earth？ (Assume the gravitational acceleration is a constant)
第4题
求解运动学问题，为什么需要初始条件？ Why do we need initial conditions to solve the kinematics problem？
A、初始条件用于确定积分常量，使不定积分变成定积分； The initial conditions are used to determine the integral constant so that the antiderivative becomes a definite integral;
B、初始条件用于确定积分常量，使定积分变成不定积分； The initial condition is used to determine the integral constant so that the definite integral becomes the antiderivative;
C、初始条件用于确定初始速度； The initial conditions are used to determine the initial velocity;
D、初始条件用于确定初始位置； Initial conditions are used to determine the initial position;
第5题
A rock is thrown straight up with an initial velocity of 15.0 m/s. Ignore energy lost to air friction. How high will the rock rise？
A．1.53 m
B．22.9 m
C．6.50 m
D．11.5 m
第6题
8. A ball is projected with an initial velocity of magnitude v = 40 m/s toward a vertical wall as shown in the figure. How long does the ball take to reach the wall？______ S. （Ignore air resistance.)
A．0.3
B．0.4
C．1.0
D．2.0
E．3.0
F．4.0G、0.1H、5.0
第7题
A small sphere [图] with mass m moves from the sam...
A small sphere
with mass m moves from the same height to the ground along three different paths. It is assumed that the initial velocity is zero and all frictions can be neglected. If the velocities of the sphere when it reaches the ground are
,
and
，respectively, then
A、
B、
C、
D、
第8题
a small sphere with mass m moves along a smooth semi-circular path
A small sphere with mass m moves along a smooth semi-circular path
. The initial velocity
points downward. Which of the following statements are correct？
A、The momentum is not conserved during the motion.
B、The angular momentum about point
is conserved during the motion.
C、The angular momentum about point
is not conserved during the motion.
D、The momentum is conserved during the motion.
第9题
a small sphere with mass m moves along a smooth semi-circular path
A small sphere with mass m moves along a smooth semi-circular path
. The initial velocity
points downward. Which of the following statements are correct？
A、The momenta of the sphere are the same at point
and point
.
B、The momenta of the sphere are different at point
and point
.
C、The kinetic energy of the sphere is the same at point
and point
.
D、The kinetic energy of the sphere is different at point
and point
.
