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设A，B是任意两事件，若AB = ？且 [图] = ？，则 [图]....
设A，B是任意两事件，若AB = Æ且![设A，B是任意两事件，若AB = ？且 [图] = ？，则 [图]....设A，B是任意两事件，若](https://img2.soutiyun.com/shangxueba/ask/19395001-19398000/19396861/dc23c9f-chaoxing2016-248557.jpeg)
= Æ，则![设A，B是任意两事件，若AB = ？且 [图] = ？，则 [图]....设A，B是任意两事件，若](https://img2.soutiyun.com/shangxueba/ask/19395001-19398000/19396861/f9e24b5-chaoxing2016-171746.jpeg)
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提问人：网友piao2008yq
发布时间：2022-01-06
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.第4题
Which of the following ideas is helpful in understanding projectile motion?
A、The horizontal motion is independent of the vertical motion.
B、The velocity of the objects is zero at the point of maximum elevation.
C、Acceleration is +g when the object is rising and -g when falling.
D、In the absence of friction, the trajectory will depend on the object’s mass as well as its initial velocity and launch angle.
第5题
A girl throws a stone from a bridge. Consider the following ways she might throw the stone. The speed of the stone as it leaves her hand is the same in each case. Case A: Thrown straight down; Case B: Thrown out at an angle of 45 degrees above horizontal; Case C: Thrown straight out horizontally. In which case will the speed of the stone be greatest when it hits the water below?
A、Case A
B、Case B
C、Case C
D、The speed will be the same in all cases.
第6题
In Fig. 1, as the ball shown rolls down the hill, 
A、both its speed and its acceleration increase.
B、its speed increase and its acceleration decrease.
C、both speed and acceleration decrease.
D、its speed decreases and its acceleration increase.
第7题
[图]A、Straight lineB、CircleC、ParabolaD、Ellipse...
A、Straight line
B、Circle
C、Parabola
D、Ellipse
第8题
A particle of mass m is exerted with a force. Which of the following force is NOT conserved? Where b, g, k, C, D are constants, and v is the speed of the particle.
A、
B、
C、
D、
第9题
A particle is suspended from a post on top of a cart by a light string as shown in Figure. The cart and particle are initially moving to the right at constant speed v, with the string vertical. The cart suddenly comes to rest when it runs into and sticks to a bumper. Which of the following statements is true about the collision process? 
A、The linear momentum of the cart is conserved.
B、The linear momentum of the particle is conserved.
C、The linear momentum of the cart and linear momentum of the particle are both conserved.
D、The linear momentum of the cart and linear momentum of the particle are both not conserved.
第10题
A car initially traveling eastward turns north by traveling in a circular path at uniform speed as shown in Figure. The length of the arc ABC is 200 m, and the car completes the turn in 20.0 s. What is its average acceleration during the 20.0 s interval (in SI unit)? 
A、0
B、0.5
C、
D、
