physics
7/29/2015 Problem set worksheet: inClassExam#1
http://homework.kineticbooks.com/pset_worksheet.php?syllabus_id=149364 1/4
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inClassExam#1
Chapters I, II, III
Chapter 1: Measurement and Mathematics
Section 18: Trigonometric functions
1.18.1 (5.00)
You want to estimate the height of the Empire State Building. You start at its base and walk 15 m away. Then you approximate the angle from the ground at that point to the top to be 88 degrees. How tall do you estimate the Empire State Bulding to be?
429.54 (1/1 submissions used) m
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Section 19: Radians
1.19.1 (7.00)
Find the radian measure of one of the angles of a regular pentagon. (The angles are all the same in a regular pentagon.) In degrees, the formula for the sum of the interior angles of an nsided polygon is (n − 2) 180°.
1.885 (1/1 submissions used) radians
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Chapter 2: Motion in One Dimension
Conceptual problems
2.C.7 (5.00)
Two people drive their cars from Piscataway, New Jersey, to Perkasie, Pennsylvania, about 35 miles east, leaving at the same time and using the same route. The first driver travels at a constant speed the whole trip. The second driver stops for a while for doughnuts and coffee in Lambertville. They arrive in Perkasie at the same time. Do the cars have the same average velocity? Explain.
Yes No (1/1 submissions used)
direction. They arrived at the same time because he must have travelled at a higher speed after stopping at Lambertville; making the average speed of the speed before and after Lambertville to be equal to driver one's average speed. (1/1
submissions used)
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2.C.8 (5.00)
Elaine wants to return a video she rented at the video store, which is 5.0 kilometers away in the positive direction. It takes her 10 minutes to drive to the store, 1.0 minute to deposit the videotape, and 9.0 more minutes to drive home. What is her average velocity for the entire trip?
7/29/2015 Problem set worksheet: inClassExam#1
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6.67 (1/1 submissions used) m/s
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2.C.10 (5.00)
The position versus time graph for a man trapped on an island is shown. Is he traveling at a constant velocity? Explain.
Yes No (0/1 submissions used)
(0/1 submissions used)
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2.C.17 (5.00)
A football is thrown vertically up in the air at 10 m/s. If it is later caught at the same spot it was thrown from, will the speed be greater than, less than, or the same as when it was thrown? Ignore air resistance.
(0/1 submissions used)
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Section 2: Displacement
2.2.1 (5.00)
A photographer wants to take a picture of a particularly interesting flower, but he is not sure how far away to place his camera. He takes three steps forward, four back, seven forward, then five back. Finally, he takes the photo. As measured in steps, what was his displacement? Assume the forward direction is positive.
(0/1 submissions used) step(s)
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2.2.4 (5.00)
The Psychic Squishy Sounds band is on tour in Texas and now are resting in Houston. They traveled 60.0 miles due south from their first concert to Huntsville. If Huntsville is 80.0 miles due north of Houston, what is their displacement from the first concert to Houston? Use the convention that north is positive, and south is negative.
(0/1 submissions used) miles
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Section 4: Average velocity
2.4.4 (5.00)
You made a journey, and your displacement was +95.0 km. Your initial velocity was +167 km/h and your final velocity was −26.0 km/h. The journey took 43.0 minutes. What was your average velocity in kilometers per hour?
(0/1 submissions used) km/h
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Section 5: Instantaneous velocity
2.5.3 (5.00)
The velocity versus time graph of a unicycle is shown. What is the instantaneous velocity of the unicycle at (a) t = 1.0 s, (b) t = 3.0 s, and (c) t = 5.0 s?
(a) (0/1 submissions used) m/s
(b) (0/1 submissions used) m/s
(c) (0/1 submissions used) m/s
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Section 18: Motion equations for constant acceleration
2.18.3 (5.00)
The city is trying to figure out how long the traffic light should stay yellow at an intersection. The speed limit on the road is 45.0 km/h and the intersection is 23.0 m wide. A car is traveling at the speed limit in the positive direction and
can brake with an acceleration of −5.20 m/s2. (a) If the car is to stop on the white line, before entering the intersection, what is the minimum distance from the line at which the driver must apply the brakes? (b) How long should the traffic light stay yellow so that if the car is just closer than that minimum distance when the light turns yellow, it can safely cross the intersection without having to speed up?
(a) (0/1 submissions used) m
(b) (0/1 submissions used) s
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Section 23: Freefall acceleration
2.23.1 (5.00)
An elevator manufacturing company is stresstesting a new elevator in an airless test shaft. The elevator is traveling at an unknown velocity when the cable snaps. The elevator falls 1.60 meters before hitting the bottom of the shaft. The elevator was in free fall for 0.900 seconds. Determine its velocity when the cable snapped. As usual, up is the positive direction.
(0/1 submissions used) m/s
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Section 29: Interactive problem: shuffleboard
2.29.2 (5.00)
Use the information given for the second interactive problem in Section 2.29 to answer the following questions. (a) Using an initial velocity of 2.00 m/s, what is the acceleration of the puck? (b) What is the initial velocity required to stop the puck at the goal line? Test your answer using the simulation.
(a) (0/1 submissions used) m/s2
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(b) (0/1 submissions used) m/s
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Chapter 3: Vectors
Section 3: Polar notation
3.3.1 (5.00)
The tugboat Lawowa is returning to port for the day. It has a speed of 7.00 knots. The heading to the Lawowa's port is 38.0° west of north. If due east is 0°, what is the tug's heading as a vector in polar notation?
( (0/1 submissions used) knots, (0/1 submissions used) °)
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Section 9: Multiplying rectangular vectors by a scalar
3.9.2 (7.00)
Three vectors that are neither parallel nor antiparallel can be arranged to form a triangle if they sum to (0, 0). (a) What vector forms a triangle with (0, 3) and (3, 0)? (b) If you multiply all three vectors by the scalar 2, do they still form a triangle? (c) What if you multiply them by the scalar a?
(a) ( (0/1 submissions used) , (0/1 submissions used) ) (b) Yes No (0/1 submissions used) (c) Yes No (0/1 submissions used)
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