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Cummings,Laws,Redish,Cooney-Understanding Physics (Homework)

James Finch

Physics - College, section 1, Fall 2019

Instructor: Dr. Friendly

Current Score : 0 / 10

Due : Monday, January 28, 2030 00:00 EST

Last Saved : n/a Saving...  ()

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  • Instructions

    Here are some textbook questions from Understanding Physics 1/e by Cummings, Laws, Redish, and Cooney published by John Wiley & Sons, Inc.

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1. –/2 points CLPhys1 1.P.001. My Notes
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Speed of Light Express the speed of light, 3.0 ✕ 108 m/s, in the following units.
(a) feet per microsecond
ft/µs
(b) nanometers per millisecond
nm/ms
Section 1.5 The SI Standard of Time
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2. –/1 points CLPhys1 2.P.027. My Notes
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Even Faster Electrons An electron with initial velocity v0 = 2.3 ✕ 105m/s enters a region 1.0 cm long where it is electrically accelerated (Figure 2-26). It emerges with velocity v = 5.40 ✕ 106 m/s. What was its acceleration, assumed constant? (Such a process occurs in the electron gun in a cathode-ray tube, used in television receivers and oscilloscopes.)
m/s2


Figure 2-26

Section 2.5 Constant Acceleration: A Special Case
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3. 0/1 points  |  Previous Answers CLPhys1 4.XP.003. My Notes
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0/1
 
Which of the arrangements of axes in Fig 3-23 below can be labeled "right-handed coordinate system"? As usual, each axis label indicates the positive side of the axis. (Select all that apply.)
Incorrect: Your answer is incorrect.


Figure 3-23

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4. 0/2 points  |  Previous Answers CLPhys1 12.XP.006. My Notes
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A small solid marble of mass m and radius r will roll without slipping along the loop-the-loop track shown in Fig. 12-34 if it is released from rest somewhere on the straight section of track. (Use any variable or symbol stated above along with the following as necessary: R for the radius of the loop-the-loop, and g for the acceleration due to gravity.)

Figure 12-34
(a) From what minimum height h above the bottom of the track must the marble be released to ensure that it does not leave the track at the top of the loop? (The radius of the loop-the-loop is R. Assume R ≪ r.)
hmin = Incorrect: Your answer is incorrect.

(b) If the marble is released from height 6R above the bottom of the track, what is the magnitude of the horizontal component of the force acting on it at point Q?
Fhorizontal =
Click here for help with symbolic formatting.
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5. –/4 points CLPhys1 22.P.030. My Notes
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Four Charged Particles Figure 22-28 shows four charged particles that are fixed along an axis, separated by distance d = 1.70 cm. The charges are indicated.


Figure 22-28

(a) Find the magnitude and direction of the net electrostatic force on the particle with charge -e, due to the other particles.
N

(b) Find the magnitude and direction of the net electrostatic force on the particle with charge +2e, due to the other particles.
N
Section 22.8 Solving Problems Using Coulomb's Law
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