An object is dropped from a vertical distance of 50m above the ground and it takes 3.19sec to fall that distance. A second identical object to launched from the same height, with a horizontal velocity of 45.9 m/s.  How long does the second object take to fall 50m ? a) Much less than 3.19 sec b) More than 3.19 sec c) Almost 3.19 sec d) Exactly 3.19 sec  e) Less than 3.19 sec

00 How long does it take (in seconds) for light to travel from the Sun to Saturn if the Sun is roughly 1.5 10^9 km away and the speed of light is 3*10^8 m/s? (Only write the number; your answer is assumed to be calculated in seconds) hp & #3 2$ backs 4 5 7 9. e r y d f h j k

6. A train is moving with a constant speed. The train moves 60 meters for every 1.5 seconds that elapses. a. Assume that we get 40 by dividing 60 by 1.5. What is the name that is commonly given to a quantity represented by this number 40? b. To denote the quantity completely, what additional information must be given besides the number 40? c. How would you interpret the number 40 in this instance? Your answer should mention distance and time. d. Use your interpretation (not algebra) to find the distance the train moves in 2.5 seconds.

Answers to Lab Questions: 1. Based on the position vs time graph in the simulation 1, what is the functional form of the position according to your best fit? 2. Based on the velocity vs time graph in the simulation 1, what is the functional form of the velocity accoršing to your best fit?

4. A ship flies at 0.82c and is observed by ground-based radar to be 65 m in length. What is the ship's proper length? a) b) c) 96 m 114 m 88 m d) e) 143 m 131 m

11:23 4 3 4 Time (s) 2 of 12 1 5 6. Jen made a diagram to compare speed and velocity. Which label belongs in the area marked X? a. Is always constant b. Has direction c. Includes magnitude d. Depends on a reference frame Speed Velocity 7. A train travels 600 km in 4 hours. What is the speed of the train? a. 0.007 km/h b. 604 km/h c. 150 km/h d. 2,400 km/h 8. The free-body diagrams of four objects are shown. Which object has a net force of -5 N c. Y down? a. W b. X d. Z 1F,= 20 N 20N F= 10 N F- 15 N F--10 N F= 10 N F,=-15 N F,- 15 N F,=-10 N F, = 20 N F,= -15 N JÉ = 10 N F=-10 N VF =-15N F--15 N VF, = -25 N W X Y 9. A skateboard rider starts from rest and maintains a constant acceleration of + 0.50 m/s? for 8.4 s. What is the rider's displacement during this time? a. 10 m b. 14 m с. 18 m d. 22 m 10. A sports car can move 100.0 m in the first 4.5 s of uniform acceleration. Find the car's acceleration. a. 9.9 m/s b. 12.5 m/s c. 25.2 m/s d. 45.8 m/s 11. A rolling ball has an initial…

The motion of a cart can be represented by x(t)=(-2.5m/s)t-10.0m. At what time does this cart cross the origin? a)it crosses the origin t=4s after we start observing it b)It crosses the origin t=0s after we start observing it c)If it were moving the same way before we started observing it then it crossed the origin 4 seconds before we started counting.

5. Describe the motion of each of the following examples if they are observed from the stated frame of reference: a) A person standing on a platform viewed from a train traveling North b) A ball dropped by a boy walking at a velocity of 1m/s viewed by the boy c) A ball dropped by a boy walking at a velocity of 1 m/s as seen by a nearby viewer who is stationary

2. Please help me answer these questions, well explained. A spacecraft travelling at a speed of 0.95 c goesfrom the planet Jupiter to the planet Pluto. A. If an observer on planet Jupiter mesures thelength of the vessel as 55 m, how long is it when it is stationary? B. A monkey inside the ship has a pulse of 116beats/min when he is on the earth. What is his pulse inside the ship?

If two bodies are moving in opposite directions with non-zero velocities, which of the following statements is true? a) Relative velocity > Absolute velocity b) Relative velocity < Absolute velocity c) Relative velocity = Absolute velocity d) Relative velocity <= Absolute velocity