Quiz 1 A
Name___________________________________
MULTIPLE CHOICE. Choose the one alternative that best completes the statement or answers the question.
1) The density of bubble gum is about 1g per cubic cm. You blow an 8g wad of gum into a bubble
with a 10cm diameter. What is the thickness of the bubble's skin?
A) 0.01mm
B) 0.1mm
C) 0.2mm
D) 0.5mm
E) 1.0mm
1)
2) In 1996, Josia Thugwame from South Africa won the Olympic Marathon, completing the 26
miles and 385 yard course in 2h 12min and 36s. What was his average speed?
A) 1m/s
B) 5m/s
C) 10m/s
D) 20m/s
E) 30m/s
2)
3) A jetliner leaves San Francisco for New York (4600 km away). With a strong tailwind it has an
average speed of 1100km/h. At the same time another jetliner leaves NY for SF. Flying against
the wind, it only has an average speed of 700km/h. When and where do the two planes pass
each other?
A) After 2.5h and 2000km away from NY
B) After 2.5h and 2000km away from SF.
C) After 5h and 1000km away from NY.
D) After 2h and 3000km away from SF.
E) After 2h and 1500km away from NY.
3)
4) A space shuttle's main engines shut off 8.5min after launch. At that time the shuttle has
reached a speed of 7.6km/s. What is the shuttle's average acceleration during the launch?
A) 1.5 g
B) 3.0 g
C) 4.5 g
D) 0.5 g
E) 0.1 g
4)
5) A car drives North at 40miles/h for 10min, then turns East and goes 5.0 min at 60 miles/h.
Finally, it goes Southwest at 30miles/h for 6.0 min. How far away is the car at the end from the
place it started? (1st Hint: I'm asking for the distance "as the crow flies") (2nd Hint: Define a
coordinate system, and use vector addition.)
A) 2 miles
B) 5 miles
C) 8 miles
D) 11 miles
E) 14 miles
5)
6) You are on a tall building with three identical balls. You throw the first one down the building
with an initial speed of 5m/s. You throw the second one up with initial speed of 1m/s. You let
the third one drop down with initial speed of zero. In what order do the three balls arrive at
the bottom of the building if all three balls start their motion at the same time?
A) 1,2,3
B) 2,3,1
C) 3,1,2
D) 1,3,2
E) all three arrive at the bottom at the same time
6)
7) A 2.0m tall basketball player is standing on the floor 10.0 m away from the basket. If she
throws the ball at a 40 degree angle with the horizontal, at what initial speed must she throw
the ball so that it goes through the hoop without striking the backboard? The height of the
basket is 3.05 m.
A) 8m/s
B) 10m/s
C) 12m/s
D) 14m/s
E) 16m/s
7)
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8) Imagine you are jumping out of a plane with a parachute. As you enjoy sailing down towards
earth at a steady speed of 10m/s, suddenly the parachute disconnects from you, and you enter
free fall towards the ground. This happens about 50m above ground. What is your velocity as
you reach the ground? (Hint: ignore air resistance during the free fall portion)
A) 10m/s
B) 20m/s
C) 30m/s
D) 40m/s
E) 50m/s
8)
9) The cosing scene in the movie "Harold & Maud" shows a Jaguar driving across a cliff, crashing
into the beach below. Assume the Jaguar has an initial speed of 18.0m/s as it leaves the cliff in
the horizontal, and the cliff is 50.0m high. What should the angle of the car be with respect to
the vertical as it hits the beach?
A) 30 degree
B) 40 degree
C) 50 degree
D) 60 degree
E) 70 degree
9)
10) A Cessna aircraft has a lift-off speed of 120km/h. This is the minimum spped it needs to lift off
the ground. What minimum constant acceleration is required if the takeoff runway is only
240m long?
A) 1.0m/s^2
B) 2.0m/s^2
C) 2.5m/s^2
D) 3.0m/s^2
E) 3.5m/s^2
10)
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Answer Key
Testname: QUIZ1
1)
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10)
C
B
A
A
B
D
B
C
A
C
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