PH2100 F23 Exam 1- Requires Respondus LockDown Browser_ PH2100 0A Fall 2023

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PH2100 F23 Exam 1- Requires Respondus LockDown Browser Due Sep 21 at 7:30pm Points 100 Questions 20 Available Sep 21 at 5:45pm - Sep 21 at 8pm 2 hours and 15 minutes Time Limit 90 Minutes Requires Respondus LockDown Browser Instructions This quiz was locked Sep 21 at 8pm. Attempt History Attempt Time Score LATEST Attempt 1 70 minutes 62.5 out of 100 Score for this quiz: 62.5 out of 100 Submitted Sep 21 at 7:10pm This attempt took 70 minutes. Using only your 3.5" x 5" card and a calculator, complete problems 1-20 to the best of your ability. Show all work on the BACK SIDE of your scratch/signature sheet. (You may request extra scratch paper from a proctor if you wish.) Then work problems 21 and 22 in the spaces provided on the worksheet and write your final answers in the boxes. Submit all scratch paper and your 3.5"x5" card to a proctor when finished. 5 / 5 pts Question 1 The flow rate of a pump is given as 4.2 m^3/hour. How many cm^3/second is this? 4,200,000 cm^3/seccond 0.000042 cm^3/second
0.015 cm^3/second 1.5 million cm^3/second 1200 cm^3/second Correct! Correct! 5 / 5 pts Question 2 Two displacements are added to find a total displacement. If x1 = 2.76 m and x2 = 1.750 m, What is the sum (x1 + x2) reported to the correct number of significant digits? 4.5 m 4.51 m Correct! Correct! 4.6 m 4.510 m 5 m 5 / 5 pts Question 3 Which of the motion diagrams pictured below correctly represents a ball thrown up into the air and caught roughly at the same height?
Click to reload image C All of these work equally well B Correct! Correct! A D 0 / 5 pts Question 4 Consider the velocity vs. time graph above. Assuming the object is at x = 0 when t = 0, what is the displacement of the object when t = 8? Click to reload image 8 m
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13 m ou Answered ou Answered 16 m 11 m 3 m orrect Answer orrect Answer 5 / 5 pts Question 5 Consider the position vs. time graph above. What is the speed of the object when t = 1.5 s? Click to reload image 2.25 m/s 1 m/s Correct! Correct! 3 m/s
7 m/s 1.5 m/s 0 / 5 pts Question 6 Consider the following description of motion: An object starts at rest, then accelerates to 2 m/s to the right over 4 seconds. It then moves at a constant speed for 2 seconds. Finally, it changes direction and returns to its starting point at a constant speed over 4 seconds. What are the average speed and average velocity for this entire motion? avg speed = 2.4 m/s, avg velocity = 2 m/s avg speed = 2 m/s, avg velocity = 2 m/s ou Answered ou Answered avg speed = 1.6 m/s, avg velocity = 2 m/s avg speed = 1.6 m/s, avg velocity = 0 m/s orrect Answer orrect Answer avg speed = 2.4 m/s, avg velocity = 0 5 / 5 pts Question 7 Which of the following could be appropriately used as a unit for an acceleration? (Check all that apply.) cubic cm/second mph/sec Correct! Correct!
km/hour/sec Correct! Correct! meter/second^2 Correct! Correct! meter/hour/kg meters^2/seconds^2 0 / 5 pts Question 8 The following position vs. time function describes the position (in meters) of a robot moving along a track at any time t (in seconds). What is the speed of the robot at t = 0? Click to reload image 2 m/s ou Answered ou Answered 12 m/s 3 m/s 0 m/s 6 m/s orrect Answer orrect Answer 5 / 5 pts Question 9
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As pictured, a skateboarder approaches the bottom of a 5.2 m long ramp which slopes upward at 22 degrees above the horizontal. At the bottom of the ramp, the skateboarder has a speed of 6.4 m/s. Assuming friction and air drag can be neglected, how fast are they moving when they reach the top of the ramp? Click to reload image 1.7 m/s Correct! Correct! The sktateboarder doesn't make it to the top 5.3 m/s 3.5 m/s 1.4 m/s 5 / 5 pts Question 10 Consider the two velocity vectors below: m/s m/s Find the magnitude of vector:
Click to reload image 15 m/s 8.1 m/s 5 m/s 7.8 m/s Correct! Correct! 6.3 m/s 5 / 5 pts Question 11 In a game of kickball, a player kicks a 0.8 kg ball on the ground. The ball leaves the ground with a speed of 6.4 m/s at an angle of 21.4 degrees above the horizontal. When the ball returns to the ground at the same level what is its speed? 4.8 m/s 2.3 m/s 6.4 m/s Correct! Correct! 7.1 m/s 6.0 m/s 0 / 5 pts Question 12
The image below shows a variety of trajectories at which a projectile could be launched: Which of the following best orders the vertical component of the initial launch speed of these projectiles? Click to reload image 90>15=75>30=60>45 45>30=60>15=75>90 90>75>60>45>30>15 orrect Answer orrect Answer 90=75=60=45=30=15 ou Answered ou Answered 15>30>45>60>75>90 5 / 5 pts Question 13 A river flows from west to east with a speed of 2.7 m/s. If a captain of a boat which can move at 5.4 m/s in still water points their boat directly north across the river, in what direction will the boat move?
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due north 30 degrees east of north 45 degrees east of north 60 degrees east of north 27 degrees east of north Correct! Correct! 2.5 / 5 pts Question 14 An object moves in uniform circular motion such that it traces a circle of radius 1.00 m at a speed of 0.50 m/s. Which of the following statements are true? (Check all that apply.) Angular velocity cannot be determined Angular velocity is 0.5 rad/sec Correct! Correct! Radial acceleration is zero ou Answered ou Answered Angular acceleration is zero Correct! Correct! Tangential acceleration is 0.25 m/s/s Radial acceleration is 0.25 m/s/s orrect Answer orrect Answer Tangential acceleration is 0 Correct! Correct! 5 / 5 pts Question 15 Consider the following angular velocity vs time graph:
Assuming the object starts at =0, at which of the following times is the magnitude of the angular position of this object largest? Click to reload image t = 3.5 s t= 7.0 s t = 5.5 s t = 4.5 s Correct! Correct! t = 1.5 s 0 / 5 pts Question 16 A displacement vector has a magnitude of 2.0 m and points in a direction 35.9 degrees west of north. Enter the magnitude of the northward component of this vector in meters. (Enter your answer to two decimal places to avoid rounding error.)
1.17 ou Answered ou Answered 1.62 margin of error +/- 1% orrect Answer orrect Answer 5 / 5 pts Question 17 A ferris wheel has a diameter of 62 m. If a person seated along the outside edge of the wheel has a linear speed of 7.6 m/s, what is the angular speed of this wheel in rotations/min (rpm)? 4.6 rpm 7.8 rpm 0.55 rpm 1.1 rpm 2.3 rpm Correct! Correct! 0 / 5 pts Question 18 A car moving with a constant speed of 23 m/s rounds a circular corner with a radius of 54 m. What centripetal acceleration in g's (multiples of the acceleration due to gravity) is needed to keep this car moving in a circle? 2.3 g 1.0 g orrect Answer orrect Answer 0.10 g
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0.43 g ou Answered ou Answered 9.8 g 0 / 5 pts Question 19 A person on a motorcycle leaves the top of a ramp angled 16 degrees above the horizontal with an initial speed of 32 m/s. Neglecting air resistance, what is the magnitude of the acceleration of the motorcyclist when they reach their highest point in the jump? 30.7 m/s/s 8.8 m/s/s ou Answered ou Answered 0 m/s/s 9.8 m/s/s orrect Answer orrect Answer 2.0 m/s/s 5 / 5 pts Question 20 A washing machine tub is initially at rest when it begins its spin cycle. It experiences an angular acceleration of 4.2 rad/sec/sec until it reaches its steady-state spin speed of 950 rpm. How long does this spin up process take? 226 sec 54 sec
24 sec Correct! Correct! 3.8 sec 17 sec (10 pts) Worked problem #1: Show your work in the upper box on the worksheet . Enter your answer (including units) in the answer box. A basketball player shoots a successsful free throw standing a horizontal distance of 4.6 m away from the basket as shown. If the initial velocity of the ball is 7.5 m/s at an angle 35 degrees above the horizontal, how far below the basket was the ball released? Click to reload image (10 pts) Worked problem #1: Show your work in the lower box on the worksheet. Write your final answer in the appropriate boxes. A person walks 69.0 m at an angle 26.0 degrees north of east. They then walk 39.0 m due east. Find the magnitude and angle of their total displacement from the starting point. Report your answers to 3 significant digits.
Quiz Score: 62.5 out of 100
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