Physics 1408

Since you may take the online quizzes as often as you like, your highest average should be pretty good. However, in order to keep track, you must fill out the student name and id# part of the form.

Question 1. A projectile is fired from the top of a cliff as shown below. Which of the paths 1-5 would the projectile most likely follow?

(a) 1     (b) 2     (c) 3     (d) 4     (e) 5

 

 

Question 2. A bowling ball accidentally falls out of the cargo bay of an airliner as it flies along in a horizontal direction. As observed by a person standing on the ground and viewing the plane as in the figure below, which of the paths 1-5 would the bowling ball most closely follow as it falls to the ground.

(a) 1     (b) 2     (c) 3     (d) 4     (e) 5

 

 

Question 3. A boy on a tower throws a ball so that it leaves his hand horizontally and at a height above the ground of 20 m. How many seconds does it take for the ball to hit the ground?

(a) 1     (b) 2     (c) 3     (d) 4     (e) 5

 

 

Question 4. If the ball in the previous question lands on level ground at a distance of 10 m from the tower, how fast (in m/s) did the ball leave his hand?

(a) 5     (b) 10     (c) 15     (d) 20     (e) 25

 

 

Question 5. A cannon fires a projectile at an angle of 60^o. The projectile will follow a curved path until it impacts the ground. Neglecting air resistance, how far below a straight-line path will the projectile fall in 3 seconds?

(a) 1 m     (b) 5 m     (c) 20 m     (d) 30 m     (e) 45 m

 

 

Question 6. You are on one of the commuter buses that is moving at 10 m/s relative to the road. If you walk toward the front of the moving bus at 1 m/s, your speed relative to the road (in m/s) is

(a) 1     (b) 9     (c) 10     (d) 11     (e) 15

 

 

Question 7. For the bus in the previous question, if you walked toward the back of the moving bus at 1 m/s, your speed relative to the road (in m/s) is

(a) 1     (b) 9     (c) 10     (d) 11     (e) 15

 

 

Question 8. The radius of Earth is 6.4 X 10⁶ m. A satellite moves in a circular orbit 640 km above Earth's surface with a period of 98 minutes. The speed of the satellite (in km/s) is

(a) 0     (b) 7.5     (c) 11     (d) 15     (e) 25

 

 

Question 9. The magnitude of the centripetal acceleration (in m/s²) for the satellite in the previous problem is

(a) 0     (b) 5     (c) 8     (d) 10     (e) 15

 

 

Question 10. If the acceleration of gravity at the satellite's altitude is 8 m/s², then in 1 s the satellite falls out of its straight-line trajectory by an amount (in m) of

(a) 0     (b) 0.625     (c) 2.5     (d) 4     (e) 10

 

 

Question 11. If raindrops fall vertically at 4 m/s and you run horizontally at 3 m/s, then the speed (in m/s) that the raindrops hit your face is

(a) 0     (b) 1     (c) 2     (d) 5     (e) 7

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