Multiple+choice+answers

Answers to the multiple choice questions Chapter 2 Chapter 3 1. x=20.0824 m/s, y=6.14m/s (D) Formula used: Vx=V*cos(θ) and Vy=V*sin(θ) 2. 49.1592 m @36.1542 degrees N of E (B) Formula Used: Pythagorean Theorem and vector addition 3. 60m (B) Formula Used:ΔX=Vx*t 4. 9,998.48 m/s (A) Formula Used: Vy=V*sin(θ) 5. 20580 m/s (B) Formula Used: Vy=Voy+a*t (Voy=Initial vertical velocity) 6. 1344953 m (D) Formula Used: X=V*cos(θ)*t

Chapter 5 1a) C 1b) D 2) E 3) D 4) D

Chapter 6 1. C 2. C 3. D 4. A 5. D

Chapter 10 1. (B) First convert Fahrenheit to Celsius using the simple formula. After this, add 273.15 to convert it to Kelvin. 2. (C) Almost nobody uses Fahrenheit besides us and everyone else uses Celsius. However, Kelvin is the SI unit. Thermos is a fake answer! 3. (A) Multiply the volume by the pressure and you'll get 4. Divide this by the temperature (in Kelvin) and then divide it by the value for R (0.0821). 4. (D) Multiply the length by the coefficient of steel and then by the change in temperature. 5. (B) Again, simply multiply the volume by the coefficient of water and then multiply again by the change in temperature.

Chapter 11 1 (A) because when you get the amount of energy needed to vaporize the helium with the equation Q=mLv then you divide that answer by the power and you get 69.7 min. 2 (A) because a unit of heat is a calorie 3 (c) because 1 cal= 4.186 J 4 (B) because ice to water is melting 5 (C) convection is the transfer of energy by the movement of a substace an example is your hand over an open flame

Ch 12 1 (A) because the area under a PV diagram is Work 2 (B) because W=-P∆V 3 (B) because a heat engine takes in energy by heat and converts it to other forms 4 (C) because kevin and Planck created the second law of thermodynamics 5 (C) because Q is in Joules and T is in kelvins

Chapters 13 and 14 1. (D) Both statements II and III are fundamental. Acceleration is not constant. 2. (C) Vmax is inversely proportional to the square root of m. If m is increased by two, Vmax will decrease by the square root of two. 3. (D) K is the angular wave number, and 2 over one half equals 4 4. (E) K/E = (3/8)(kA^2) / (1/2)(kA^2) = 3/4 5. (B) 40 / 4 = 10 6. (E) 10 log (10^2) = 20 dB 7. (B) Total distance is 2d, thus 70 m 8. (C) The period of a simple pendulum, at small angular displacements, is independent of amplitude

Chapter 15 1) C-They are both the same charge, so there is going to be the same amount of lines; they are both positive, so they will repel 2) B-The insulator is getting rid of the charge by distributing it to the uncharged conductor 3) A-The ground and our feet have the same charges so they are constantly pushing against each other

chapter 16 (capacitors)

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Chapters 17,18 1) C Set the bottom loop equal to 18 V and the top loop equal to -2V. Then use the current rule (I 1 + I 2 = I 3) to substitute the third current with quantities of the first and second currents. Next you should add the equations together to find the value of the first current. 2) A Plug the value of the first current back into the equation to find the second current 3) D Plug the value of the second current back into the equation to find the third current 4) A It's clockwise because the initial value calculated from the equation was negative 5) A The initial value from the equation was negative, indicating that the direction is switched

Chapter 19 1.D 2.E 3.B 4.A 5.B

Chapter 23 1. (D)-by using our mirror and lens equation (1/p+1/q=1/f) and the information given, it must be 4.36 cm behind the mirror 2. (C)- again, we must use the mirror and lens equation to get know that it is 24.0 cm away and then the rest of the info tells us its left of the lens 3. (C)- in this problem you can ignore the numbers and focus more on the location of the image and object 4. (A)- first you find M using the (H1/H) and the find q using (M=-q/p). One q is found, you use the equation (1/q+1/p=1/f) in order to find the focal length 5. (D)- you must use find the magnification in order to calculate the new location