(a).       State Newton’s first law of motions                                                                                                 (2.0 points)   (b).         An airplane during landing touches down at 40 m/s and taxis to stop in 13 s along a straight level runway. (i).          What is its acceleration?                                                                                                                     (1.5 points) (ii).         How fast and how far is the plane after 3.0 s?                                                                                 (3.0 points) (iii).       How far does the plane travel before coming to a stop?                                                                    (1.5 points)    

    Adams throws a 2.5 kg object straight up with a speed of 15.0 m/s (assume planet Earth). (a).         What is the magnitude and direction of the acceleration of the object at its maximum height?     (1.0 point)                                                         (b).         How long does it take to get to maximum height?                                                                          (1.5 points) (c).         What is the maximum height attained by the object?                                                                        (1.5 point)

                     Extra Credit  An astronaut on a certain planet releases a 15 kg object from a height of 25 m above the surface and measures the time it takes for the object to hit the ground to be 1.97s. (i).  Calculate the acceleration due to gravity on this unknown planet.             (1.5 points)                                                                                                                                                                                                                                                                     (ii). At what speed does the object hit the surface of the planet?                                                                          (1.5 points)   (iii). What is the mass of the object just before it hits the floor of the planet?                                                        (1.0 point)  

    In the absence of air resistance, a projectile launched at an angle of 15 o above the horizontal will have the same       range as a projectile launched at which of the following angles?                                                                             

2.5 kg and 3.0 kg mass are released 25 m above ground (neglect air resistance)  

What will happen if switch 3 is closed and the other switches are left open?

Resistance is a measure of how difficult it is for electrons to flow through a substance. What is the unit used for measuring resistance?

What happens when silk is rubbed on a glass rod?  

What is the equation that represents Ohm’s law?

In the circuit shown, if the resistor at X is 20Ω the resistor at Y is 10 Ω, and the resistor at Z is 25 Ω, where would the current be greatest?