Lecture- Tutorials for Introductory Astronomy
3rd Edition
ISBN: 9780321820464
Author: Edward E. Prather, Tim P. Slater, Jeff P. Adams, Gina Brissenden
Publisher: Addison-Wesley
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Chapter 4, Problem 6PAP
To determine
The meaning of x’s in the shadow plots.
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The rectangular loop of wire shown in the figure (Figure 1) has a mass of 0.18 g per centimeter of length and is pivoted about side ab on a frictionless axis. The current in the wire is 8.5 A in the direction shown. Find the magnitude of the magnetic field parallel to the y-axis that will cause the loop to swing up until its plane makes an angle of 30.0 ∘ with the yz-plane. Find the direction of the magnetic field parallel to the y-axis that will cause the loop to swing up until its plane makes an angle of 30.0 ∘ with the yz-plane.
Give a more general expression for the magnitude of the torque τ. Rewrite the answer found in Part A in terms of the magnitude of the magnetic dipole moment of the current loop m. Define the angle between the vector perpendicular to the plane of the coil and the magnetic field to be ϕ, noting that this angle is the complement of angle θ in Part A.
Give your answer in terms of the magnetic moment mm, magnetic field B, and ϕ.
Calculate the electric and magnetic energy densities at thesurface of a 3-mm diameter copper wire carrying a 15-A current. The resistivity ofcopper is 1.68×10-8 Ω.m.Prob. 18, page 806, Ans: uE= 5.6 10-15 J/m3 uB= 1.6 J/m3
Chapter 4 Solutions
Lecture- Tutorials for Introductory Astronomy
Ch. 4 - Which Moon position (AE) best corresponds with the...Ch. 4 - In the blank boxes below, sketch how the Moon...Ch. 4 - Shade in each of the four Moons shown in Figure 2...Ch. 4 - Which Moon position (Fl) best corresponds with the...Ch. 4 - How much of the entire Moon’s surface is...Ch. 4 - How much of the Moon’s illuminated surface is...Ch. 4 - Would your answers to Questions 5 or 6 change if...Ch. 4 - Consider the following discussion between two...Ch. 4 - If the Moon is a full Moon tonight, will the Moon...Ch. 4 - Where (in the southern sky, on the eastern...
Ch. 4 - Where (in the southern sky, on the eastern...Ch. 4 -
Where (in the southern sky, on the eastern...Ch. 4 -
If the Moon is a new Moon when it rises, which of...Ch. 4 -
What time is it for the person shown in Figure...Ch. 4 -
Draw a stick figure person on Earth in Figure 1...Ch. 4 - Answer the following questions for the position of...Ch. 4 -
At what time would you look to see a...Ch. 4 -
If the Sun set below your western horizon about 2...Ch. 4 -
A friend comments to you that there was a...Ch. 4 - According to Figure 1, in which direction would...Ch. 4 - If it is wintertime right now (just after the...Ch. 4 - Since Figure 1 is a reasonable representation for...Ch. 4 - During what time(s) of year would the Sun...Ch. 4 - Does the Sun always set in precisely the same...Ch. 4 - What do the x’s in the shadow plots represent?
Ch. 4 - Approximately how much time went by from the time...Ch. 4 - Approximately how long did it take to create each...Ch. 4 - How does the direction of the stick’s shadow...Ch. 4 - Using Figures 1 and 2, in what direction would the...Ch. 4 - Clearly circle the x for the shadow that...Ch. 4 - Compare the position of the x that corresponds to...Ch. 4 - Which Shadow Plot (A or B) most closely...Ch. 4 - On Figure 2, sketch the Sun’s position shortly...Ch. 4 - Based on the shadow plots in Figure 2, during...Ch. 4 - If Shadow Plot A corresponds to the path of the...Ch. 4 - If Shadow Plot B corresponds to the path of the...Ch. 4 - If you were to mark the end of the stick’s shadow...Ch. 4 - Will the stick ever cast a shadow along the...Ch. 4 - Is there ever a clear (no clouds) day of the year...Ch. 4 - Is the direction that Earth’s axis is tilted...Ch. 4 - Using the information listed above, does Earth...Ch. 4 - Would you say the temperature stays approximately...Ch. 4 - Are the seasons (summer or winter) the same in the...Ch. 4 - Consider the following discussion between two...Ch. 4 - Do you think these differences in distance between...Ch. 4 - Consider the following discussion between two...Ch. 4 - Which of the two lighted areas (the one created by...Ch. 4 - Which of the two lighted areas is smaller?
Ch. 4 - Which of the two lighted areas receives more...Ch. 4 - If a thermometer were placed in each of the...Ch. 4 - Which of the two positions would be similar to the...Ch. 4 - Which location(s) (A–F) correspond(s) with summer...Ch. 4 - Which location(s) (A–F) correspond(s) with winter...Ch. 4 - During which season (summer or winter) is the...Ch. 4 - During which season (summer or winter) is the Sun...Ch. 4 - How are your answers to the previous two questions...Ch. 4 - How would the number of hours of sunlight and the...Ch. 4 - If, somehow, the number of daylight hours did not...Ch. 4 - If the Northern Hemisphere were tilted 90° toward...Ch. 4 - Provide two pieces of evidence to support the fact...Ch. 4 - Which two things are most directly responsible for...Ch. 4 - Given the data in Table 1, plot the motion of the...Ch. 4 - On what date was the mystery planet located...Ch. 4 - On what date was the mystery planet located...Ch. 4 - Describe how the mystery planet moved (east or...Ch. 4 - During which dates does the mystery planet appear...Ch. 4 - During which dates does this mystery planet appear...Ch. 4 - If a planet were moving with retrograde motion,...Ch. 4 - Suppose your instructor says that Mars is moving...Ch. 4 - Which direction (right or left) are the oceanic...Ch. 4 - Which is hotter, the piece of mantle material at...Ch. 4 - What direction are the pieces of mantle material...Ch. 4 - Consider the following discussion between two...Ch. 4 - Just beneath Point I on the drawing is a tropical...Ch. 4 - Just beneath Point C on the drawing is an ancient...Ch. 4 - Imagine that an impact occurred on the continental...Ch. 4 - Consider the image below of the rocky and...Ch. 4 - If a new planet were discovered, what evidence...Ch. 4 - Which TWO forms of light account for the majority...Ch. 4 - Consider the following debate between two students...Ch. 4 - Comparing the visible and the infrared types of...Ch. 4 - Comparing the ultraviolet and the infrared types...Ch. 4 - Based upon Figures 1 and 2, why is ultraviolet...Ch. 4 - What gas molecules are primarily responsible for...Ch. 4 - What are the two greenhouse gases most responsible...Ch. 4 - The Sun is approximately 6000 K at the surface and...Ch. 4 - Does Earth’s surface give off light at night? If...Ch. 4 - Consider the following debate between two students...Ch. 4 - Will the light given off by Earth’s surface easily...Ch. 4 - How does the total amount of energy coming from...Ch. 4 - What type of light primarily heats Earth’s surface...Ch. 4 - Is more energy absorbed by Earth’s surface in the...Ch. 4 - Due to the light absorbed by Earth’s surface that...Ch. 4 - Prob. 16GRPCh. 4 - Consider the following debate between two students...Ch. 4 - What was the temperature at the location of...Ch. 4 - What was the temperature at the location of Mars?
Ch. 4 - Which planets formed at temperatures hotter than...Ch. 4 - Which planets formed at temperatures cooler than...Ch. 4 - Over what range of distances from the Sun would...Ch. 4 - Over what range of distances from the Sun would...Ch. 4 - Is it likely that a large, Jovian planet would...Ch. 4 - Which of the following pairs of objects would make...Ch. 4 - Using small circles to represent Earth and the...Ch. 4 - To make a scale model of the Earth–Moon orbital...Ch. 4 - Can any combinations of the following items be...Ch. 4 - Does this mean that two Suns placed side-by-side...Ch. 4 - If you were to use a 1-foot (12-inch) basketball...Ch. 4 - If we used a basketball to represent the Sun and a...Ch. 4 - How many Moons would fit across the diameter of...Ch. 4 - Approximately how many times could the Moon’s...
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- A 15.8-mW laser puts out a narrow beam 2.0 mm in diameter.Suppose that the beam is in free space. What is the rms value of E in the beam? What isthe rms value of B in the beam?Prob. 28, page 834. Ans: Erms= 1380 V/m, Brms =4.59×10-6 Tarrow_forwardA 4.5 cm tall object is placed 26 cm in front of a sphericalmirror. It is desired to produce a virtual image that is upright and 3.5 cm tall.(a) What type of mirror should be used, convex, or concave?(b) Where is the image located?(c) What is the focal length of the mirror?(d) What is the radius of curvature of the mirror?Prob. 25, page 861. Ans: (a) convex, (b) di= -20.2 cm, i.e. 20.2 cm behind the mirror,(c) f= -90.55 cm, (d) r= -181.1 cm.arrow_forwardA series RCL circuit contains an inductor with inductance L=3.32 mH, and a generator whose rms voltage is 11.2 V. At a resonant frequencyof 1.25 kHz the average power delivered to the circuit is 26.9 W.(a) Find the value of the capacitance.(b) Find the value of the resistance.(c) What is the power factor of this circuit?Ans: C=4.89 μF, R=4.66 Ω, 1.arrow_forward
- A group of particles is traveling in a magnetic field of unknown magnitude and direction. You observe that a proton moving at 1.70 km/s in the +x-direction experiences a force of 2.06×10−16 N in the +y-direction, and an electron moving at 4.40 km/s in the −z-direction experiences a force of 8.10×10−16 N in the +y-direction. What is the magnitude of the magnetic force on an electron moving in the −y-direction at 3.70 km/s ? What is the direction of this the magnetic force? (in the xz-plane)arrow_forwardA particle with a charge of −5.20 nC is moving in a uniform magnetic field of B =−( 1.22 T )k^. The magnetic force on the particle is measured to be F=−( 3.50×10−7 N )i^+( 7.60×10−7 N )j^. Calculate the x component of the velocity of the particle.arrow_forwardIs it possible for average velocity to be negative?a. Yes, in cases when the net displacement is negative.b. Yes, if the body keeps changing its direction during motion.c. No, average velocity describes only magnitude and not the direction of motion.d. No, average velocity describes only the magnitude in the positive direction of motion.arrow_forward
- Tutorial Exercise An air-filled spherical capacitor is constructed with an inner-shell radius of 6.95 cm and an outer-shell radius of 14.5 cm. (a) Calculate the capacitance of the device. (b) What potential difference between the spheres results in a 4.00-μC charge on the capacitor? Part 1 of 4 - Conceptualize Since the separation between the inner and outer shells is much larger than a typical electronic capacitor with separation on the order of 0.1 mm and capacitance in the microfarad range, we expect the capacitance of this spherical configuration to be on the order of picofarads. The potential difference should be sufficiently low to avoid sparking through the air that separates the shells. Part 2 of 4 - Categorize We will calculate the capacitance from the equation for a spherical shell capacitor. We will then calculate the voltage found from Q = CAV.arrow_forwardI need help figuring out how to do part 2 with the information given in part 1 and putting it in to the simulation. ( trying to match the velocity graph from the paper onto the simulation to find the applied force graph) Using this simulation https://phet.colorado.edu/sims/cheerpj/forces-1d/latest/forces-1d.html?simulation=forces-1d.arrow_forwardI need help running the simulation to get the result needed.arrow_forward
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