物理题 PowerYou are pulling your sister on a sled to the top of a 19.0 m high, frictionless hill with a 10.0° incline. Your sister and the sled have a total mass of 50.0 kg. You pull the sled, starting from rest, with a constant force of 127 N at
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物理题 PowerYou are pulling your sister on a sled to the top of a 19.0 m high, frictionless hill with a 10.0° incline. Your sister and the sled have a total mass of 50.0 kg. You pull the sled, starting from rest, with a constant force of 127 N at
物理题 Power
You are pulling your sister on a sled to the top of a 19.0 m high, frictionless hill with a 10.0° incline. Your sister and the sled have a total mass of 50.0 kg. You pull the sled, starting from rest, with a constant force of 127 N at an angle of 45.0° to the hill. If you pull from the bottom to the top, what will the speed of the sled be when you reach the top?
____m/s
A 1.00-kg projectile is launched upward by a launcher that performs 6.30×103J of work on it. Find the projectile’s speed at a height of 220 m.
____ m/s
A projectile with mass 0.890 kg is launched from the ground and is found to have a speed of 32.0 m/s at a height of 170 m. How much work did the launcher perform on the projectile?
_____J
A slingshot performs 0.16 J of work in launching a 1.1-g pellet into the sky. At what height does the pellet have a speed of 3.9 m/s?_____m
物理题 PowerYou are pulling your sister on a sled to the top of a 19.0 m high, frictionless hill with a 10.0° incline. Your sister and the sled have a total mass of 50.0 kg. You pull the sled, starting from rest, with a constant force of 127 N at
你把你的妹妹在雪橇上一个19.0米高、10.0°无摩擦的小山斜坡.你的妹妹和雪橇有总质量为50.0千克.你拉雪橇,从休息,恒力127 N角度为45.0°到山上.如果你把从底部到顶部,雪橇的速度是当你到达顶峰?
1.0954M/S
一个1.00公斤的抛射体是由一个发射器启动向上,执行6.30×103 j的工作它.找到弹丸的速度高度是220M
90.55M/S
一个弹丸与质量0.890公斤从地面发射,发现有一个32.0米/秒的速度在170米高度,多少工作做了发射器执行在弹吗?
1968.68J
一个弹弓执行0.16 J的工作在推出1.1 g颗粒向天空.在什么高度并颗粒的速度是3.9米/秒?m
13.78m
2题 W=mgh+0.5mv平方，求出v=约等于20m/s
3题 W=mgh+0.5mv平方，求出W即可，功转化为动能和势能