【题目】 A particl e p, moving in a straight line, passes through a fixed point o at tim e to s. At tim eis after leaving o, th e displacement of the particl e is a m and its velocity is ,ms, whe$$ r e v = 1 2 e ^ { 2 t } - 4 8 t , t \geq 0 . $$(i) ...
A particle moying in a straight line passes through a fixed point 0. The displacement, x metres, of the particle, t seconds after it passes through O, is given by$$ x = 5 t - 3 \cos 2 t + 3 $$(i) Find expressions for the velocity and acceleration of the particle after i seco...
When X=mg, the partial P is in equilibrium and on the point of sliding down the plane. Show that u=(k tan a−1)/ k + tana Deduce that, when k =1 ,a must be greater than 45 这是一道很经典的受力分析的题,同学们要先对particle P进行受力分析,rough plane,particle slide down的趋...
Determine the point P where the line x = 1 + t, y = 2t, z = -3t intersects the plane x + y - z = -3. Determine the point P where the line x = 1 + t, y = 2t, z = -3t intersects the plane x + ...
The influence of the velocity of the a particle upon the stopping power of the substance through which it passes> > > XL> > XL> XL
12 A particle moves in a straight line and passes through a fixed point O. The velocity of the particle, v ms', is given by v=-t^2+2t+8 where / is the time, in s, after leaving O.[Assume motion to the right is positive.]Find(a) the initial velocity, in ms', of the parti...
19 A particle is moving in a straight line which passes through a fixed point O.The displacement, s metres, of the particle from O at time t seconds is given by$$ s = 1 0 + 9 t ^ { 2 } - t ^ { 3 } $$(a) Find an expression for the velocity, v m/s, of the particle...
阅读理解. When a person passes through the customs between two countries, he would be questioned by a customs inspector . If a person brings in goods of great value, the inspector may ask him to pay taxes on them. Some people try to hide the valuables t
Let the required equation in intercept form be \frac{x}{a}+\frac{y}{b}=1 Therefore, its x- intercept is a and y- intercept is b \implies A(a,0) and B(0,b) is on the given line. And it is given the point (3,-2) divides the line segment A(a,0) and B(0,b
A plane passes through the point (1,-2,3) and is parallel to the plane 2x-2y+z=0. The distance of the point (-1,2,0) from the plane, is