5. Lonnie pitches a baseball of mass 0.20 kg . The ball arrives at home plate with a speed of \( 40 \mathrm{~m} / \mathrm{s} \) and is batted straight back to Lonnie with a return speed of \( 60 \mathrm{~m} / \mathrm{s} \). If the bat is in contact with the ball for 0.050 s , what is the impulse experienced by the ball? a. \( 360 \mathrm{~N} \cdot \mathrm{~s} \) b. \( 20 \mathrm{~N} \cdot \mathrm{~s} \) c. \( 400 \mathrm{~N} \cdot \mathrm{~s} \)

body placed on a rough horizontal level \( W=75 \mathrm{~N} \) horizontal force affected 50 N Makes it about to move en the coefficient of friction equals \( \begin{array}{llll}\text { 1) } \frac{1}{3} & \text { 2) } \frac{2}{3} & \text { 3) } \frac{3}{4} & \text { 4) } \frac{1}{4}\end{array} \)

QUESTION 1: EPICYCLIC GEAR AND GEAR TRAINS An epicyclic gear train has a sun wheel with 24 teeth, and two planetary wheels of 46 teeth each, The latter mesh with the internal teeth of a fixed annulus with 116 teeth. The input shaft, carrying the sun wheel, transmits \( 4,5 \mathrm{~kW} \) at \( 280 \mathrm{r} / \mathrm{min} \). The output shaft is connected to an arm L that carries the planetary wheels. Calculate the speed of the output shaft.

Essay problem a body placed on rough horizontal level and two horizontal coplanar forces affected on it \( 6,10 \mathrm{~N} \) angle between them \( 60^{\circ} \) then the body's about to move if friction coefficient \( \frac{2}{3} \) then body weight \( =\ldots, \mathrm{N} \)

body hanging by two strings and equilibrium \( T_{2}=60 \mathrm{~N} \) then \( w=\cdots \mathrm{N} \)

4. When you descend in a plane, your ears pop. Is air moving into your ears or out of them when they pop? 5. Explain why a balloon gets bigger as you put more molecules of gas into it at a constant temperature.