物理题，英文版，求详细过程一定要详细！！！
物理题，英文版，求详细过程一定要详细！！！
1、A small block is pull along a rough horizontal at a constant speed 1.5m/s by a constant force of magnitude 30N acting at an angle of x° upwardfrom the horizontal .Given that the work done by the force in 20s is 720J.calculate the value of x.
2、A partical P moves along the x-axis in the positive direction.The velocity of P at time t is 0.03t2(这个t后面的那个2是平方)m/s.When t=5 the dieplacement of P fro the origin O is 2.5m.
(i)Find an epression,in the term of t,for the displacement of P from O.
(ii)Find the velocity of P when its displacement from O is 11.25m
1、A small block is pull along a rough horizontal at a constant speed 1.5m/s by a constant force of magnitude 30N acting at an angle of x° upwardfrom the horizontal .Given that the work done by the force in 20s is 720J.calculate the value of x.
2、A partical P moves along the x-axis in the positive direction.The velocity of P at time t is 0.03t2(这个t后面的那个2是平方)m/s.When t=5 the dieplacement of P fro the origin O is 2.5m.
(i)Find an epression,in the term of t,for the displacement of P from O.
(ii)Find the velocity of P when its displacement from O is 11.25m
ljghm751128 幼苗
共回答了17个问题采纳率：94.1% 举报
1的大意：与物块运动方向成角度X大小为30N的恒力作用在一个小物块上，使物块在粗糙水平面上以1.5m/s的速度做匀速运动，这个力在20s内做功720J，求X的值。
按照这个理解，先用20s和720J和1.5m/s计算出摩擦力的大小（S=V*t，f=W/S），算得f=24N；然后恒力设为F，满足F=f/COS X，计算得X=37度（建议您自己验算一下，我怕我算不对）。...
按照这个理解，先用20s和720J和1.5m/s计算出摩擦力的大小（S=V*t，f=W/S），算得f=24N；然后恒力设为F，满足F=f/COS X，计算得X=37度（建议您自己验算一下，我怕我算不对）。...
1年前
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你能帮帮他们吗