Mechanical Engineering Answers

Design a J-K FF Sequential circuit on Mulltisim (Connect 2

JK-FF in series)

An Al-silicon dioxide-silicon MOS capacitor has an oxide thickness of 450 Å and a doping of NA 10¹5 cm³. The fixed oxide charge density is 3 x 10¹¹1 cm². Calculate (a) the flat-band voltage and (b) the threshold voltage.

Air is heated in a 4cmu 4cm square duct at uniform surface flux of 590 The mean air velocity is 0.32 m/s. At a section far away from the inlet the mean temperature is 40 . The mean outlet temperature is 120 . Determine the required length and maximum surface temperature.

From the top of a building 75m, a bullet is fired at an angle of 45° above the horizontal with an initial velocity of 270 m/s. Find the time until it hits the ground.

A man who can throw a stone with a velocity of 20 m/s wishes to hit a target placed on his own level at a distance of 30m. At what angle should be threw the stone?

A projectile is fired at the top of a building at an angle of 20° below the horizontal. If the muzzle velocity of the projectile is 8 m/s, how high is the building if the projectile reaches the ground after 3sec. 

A ball was thrown outside the window at an angle of 20° below the horizontal with an initial velocity of 8 m/s. If it lands 3 sec later, how far from the base of the building did it land?

A trench mortar fires a projectile at an angle of 53° above the horizontal with a muzzle velocity of 60 m/s. A tank is advancing directly towards the mortar on level ground at a speed of 3 m/s. What should be the distance from the mortar to tank at the instant the mortar is fired in order to score a hit?

. A ball is thrown horizontally from the roof of a building 45m tall and lands 24m from the base. What was the balls initial speed?

A marble rolling with speed of 20 cm/s, rolls off the edge of a table that is 800m high. How far horizontally from the table edge does the marble strike the floor?