Particulate Nature of Matter B.5 Electric Circuits (id: 5a4a0c923)

本题目来源于试卷: Particulate Nature of Matter B.5 Electric Circuits，类别为 IB物理学

[填空题]
A robot is used to move boxes in a factory. A box is pulled up a slope inclined at ${30}^{\circ }C$ to the horizontal by a rope connected to the robot. The tension T in the rope is 45$N$. Friction acts between the box and the ramp.


1.Define work done by a force.
2.The box is moving at a constant speed. It covers $1.2m$ in $3.0s$.
(1).Show that the output power of robot $18W$.v=   $m{s}^{-1}$
P=   W
(2).During the pull, the robot has a potential difference of $24V$ across the terminals of its battery and a current of $3.3V$ derived from the battery. Determine the efficiency of the robot in this situation.$P_t$=   W
$\frac{UsefulPower}{TotalPowe}$=  
(3).The emf of the battery is 32 $V$. Calculate the internal resistance of the battery.
3.The rope connecting the robot and the box breaks at a height of $1.5m$ from the ground level.r=   Ω​
(1)The maximum height above the ground level reached by the box is $1.505m$. Show that the work done by friction on the box after the break up to reach the maximum height is $0.15J$.$W_f$=   J
(2)Determine the coefficient of dynamic friction between the box and the incline.μ=  
The box experiences friction both on the way up the slope and also as it slides back down the slope. On the graph below, sketch the variation of the speed $v$ of the box with the time $t$ passed from when the rope breaks until the box reaches the ground level.

参考答案:
空格1: 0.40  空格2: 18  空格3: 72  空格4: 0.25  空格5: 2.7  空格6: 0.15  空格7: 0.36 


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