Basic Physics Questions and Answers

Assume the three blocks m 1 0 kg m 2 0 kg and m3 4 0 kg portrayed in the figure below move on a frictionless surface and a force F 36 N acts as shown on the 4 0 kg block MIL m a Determine the acceleration given this system m s to the right b Determine the tension in the cord connecting the 4 0 kg and the 1 0 kg blocks c Determine the force exerted by the 1 0 kg block on the 2 0 kg block

b What type of star is it c What color might you expect it to have 4 a Which star is the coolest b What type of star is it c What color might you expect it to have 5 Find Sirius B on the H R diagram a What type of star is it b Why is it so dim 6 a Which star is furthest from us b Why does it appear so bright in our sky 7 Why does Alpha Centauri A appear so bright in our sky 8 Apply what you have learned to the following hypothetical stars a If Star A has the same temperature as the Sun but a lower absolute magnitude brighter then Star A must be smaller than larger than the same size as the Sun b If Star B has the same absolute magnitude as Mimosa but is cooler then Star B must be smaller than larger than the same size as Mimosa 9 Look at the table of nearest stars List the stars that are visible with the unaided eye 14 Name 1 Sun Sol 2 Sirius A 3 Canopus 4 Arcturus 5 Alpha Centauri A 6 Vega 7 Rigel 8 Procyon A 9 Achernar 10 Betelgeuse 11 Capella B 12 Altair 13 Aldebaran 14 Capella A 15 Antares 16 Spica 17 Pollux 18 Fomalhaut 19 Deneb 20 Mimosa 21 Regulus Automatic Zoon Table 1 The Brightest Stars in the Sky Distance Apparent light years Magnitude 26 74 1 43 0 72 0 04 0 01 0 03 0 13 0 37 8 6 310 37 4 4 25 770 11 140 640 42 17 65 42 600 260 34 25 2 600 350 79 0 50 0 58 0 76 0 77 0 85 0 91 1 09 1 12 1 15 1 16 1 25 1 30 1 35 Absolute Temperatur Magnitude Kelvin 5 80 4 8 1 5 5 6 0 3 4 4 0 6 7 9 2 7 2 7 5 9 0 2 2 2 0 6 0 4 5 2 3 5 Vie 1 1 1 7 8 4 3 9 0 5 9 900 7 400 4 300 5 8 C 9 600 11 000 6 500 14 500 3 500 5 700 8 100 3 900 4 900 3 500 22 400 4 900 8 600 8 500 27 000 12 500

A freight train has a mass of 1 8 x 107 kg If the locomotive can exert a constant pull of 7 6 x 105 N how long does it take to increase the speed of the train from rest to 68 km h min

3 The purpose of the Multiple Offer Addendum is a for Buyer No 1 to assign his or her position in the contract to Buyer No 2 b to change buyers involved in new construction c to compare multiple offers d to accommodate the seller when he or she doesn t agree to the assignment

A ball is thrown straight upward and returns to the thrower s hand after 2 55 s in the air A second ball thrown at an angle of 44 0 with the horizontal reaches the same maximum height as the first ball a At what speed was the first ball thrown m s b At what speed was the second ball thrown m

9 The purpose of the Simultaneous Closing Addendum is a to compare multiple offers b for Buyer No 1 to assign his or her position in the contract to Buyer No 2 c to accommodate the seller when he or she doesn t agree to the assignment d to change buyers involved in new construction

COMMUNICATION 1 Draw an FBD for each of the following situations a A car is parked on a slope b A puck sliding to the right on rough ice surface horizontal c A toboggan pulled on a horizontal rough surface by a rope at an angle above th horizontal to the right

To understand the use of phasors in analyzing a parallel AC circuit Phasor diagrams or simply phasors provide a convenient graphical way of representing the quantities that change with time along with cos wt p This makes them useful for analyzing AC circuits with their inherent phase shifts between voltage and current If a quantity I t changes with time as I t Io cos wt a phasor is a vector whose length represents the amplitude Io see the diagram This vector is assumed to rotate counterclockwise with angular speed w that way the horizontal component of the vector represents the actual value I t at any given moment Figure 1 In this problem you will use the phasor approach to analyze an AC circuit In answering the questions of this problem keep the following in mind For a resistor the current and the voltage are always in phase For an inductor the current lags the voltage by For a capacitor the current leads the voltage by Figure R 3 of 3 Part C through the voltage source Find the amplitude of the current Express your answer in terms of the magnitudes of the individual currents I and I2 View Available Hint s Io Submit Part D tan p AE What is the tangent of the phase angle between the voltage and the current through the voltage source Express tan in terms of I and I2 View Available Hint s Submit V AZO

A 14 0 kg solid homogeneous disk of radius 0 600 m is rotating with an initial angular speed of 50 0 rad s about a frictionless horizontal shaft A 6 00 kg solid homogeneous disk of radius 0 400 m is initially at rest on the same shaft The disks are pushed into contact as shown Because of surface friction the two disks eventually attain a final common angular speed w a Find the final common angular speed wf of the system b In the collision of the two disks kinetic energy is not conserved because nonconservative frictional internal forces act during the contact How much energy was lost to friction in the collision rad wo 50 0 W1 S 0 Go o Before contact After contact rad

4 Which of the following forms has a nine page document explaining how to use it a Assignment of Interest Addendum b Assignment Assumption of Real Estate Purchase Contract c Lease Agreement with Option for Purchase d Simultaneous Closing Addendum to Real Estate Purchase Contract

Find the direction of the resultant vector 25 6 7 7 102 11 9 8 Round to the nearest tenth Er

cruise ship makes its way from one Island to another The ship is in motion compared with which reference po OA the passengers on the ship OB the captain of the ship OC O D the cargo Inside the hull of the ship a lighthouse on a nearby Island

In an R L C series circuit the magnitude of the phase angle is 54 9 with the source voltage lagging the current The reactance of the capacitor is 340 2 and the resistor resistance is 180 The average power delivered by the source is 140 W Part A Find the reactance of the inductor Express your answer in ohms XL AEO 596 1141 Submit Previous Answers Request Answer X Incorrect Try Again 7 attempts remaining S

A ball is thrown into the air with a velocity of 35 ft s Its height in feet after t seconds is given by s t 35t 16t Find the velocity in ft s of the ball at time t 1 second ft s

1 The Gravitational Constant G is 6 674 x 10 11 m kg s Using Equation 3 below what is the force of gravity E between you and a table that is 2 meters away assuming your table weighs 20 kg Remember to convert your weight to kg 1 lb 0 45 kg Show your work and report your answer with 3 significant figures F GX m X M d Equation 3

A place kicker must kick a football from a point 36 0 m about 40 yards from the goal Half the crowd hopes the ball will clear the crossbar which is 3 05 m high When kicked the ball leaves the ground with a speed of 21 4 m s at an angle of 49 0 to the horizontal a By how much does the ball clear or fall short vertically of clearing the crossbar Enter a negative answer if it falls short m b Does the ball approach the crossbar and cross above or beneath it while still rising or while falling O rising O falling

solenoid has a resistance of 46 0 2 and an inductance of 0 170 H If a 100 Hz voltage source is connected across the solenoid etermine the phase angle between the voltage and the current Part A Does the voltage lead the current or lag the current Calculate the phase angle between the voltage and the current Express your answer in degrees Submit VAEO Request Answer

A 1900 resistor is connected in series with a 400 mH inductor and an ac power supply Part A At what frequency will this combination have twice the impedance that it has at 120 Hz Express your answer with the appropriate units Value Units

12 After a foreclosure your client can build his or her credit by doing all of the following EXCEPT a making payments on time b making any late payments c applying for credit cards but never using them d paying off any accumulated debt

R L C series circuit the magnitude of the phase angle is with the source voltage lagging the current The reactance e capacitor is 340 S and the resistor resistance is 180 2 average power delivered by the source is 140 W Find the reactance of the inductor Express your answer in ohms XL Submit Part B Irms Find the rms current Express your answer in amperes Submit VAEO Part C Request Answer VAEO Request Answer Find the rms voltage of the source Express your answer in volts S A

280 resistor is in series with a 0 145 H inductor and a 0 400 F capacitor Part A Compute the impedance of the circuit at a frequency of f1 500 Hz and at a frequency of f2 1000 Hz Enter your answer in ohms separated by comma Z1 Z2 Submit Part B VAE 1 02 Request Answer In each case compute the phase angle of the source voltage with respect to the current Enter your answer in degrees separated by comma V A O d 2

Which of the following is a run on sentence A Go to the gym work out and take a nice hot shower B Go to the gym and work out Then take a nice hot shower C Go to the gym work out then take a nice long shower D Go to the gym work out and then take a nice hot shower

At some point during their orbit the location of the Earth and Moon relative to the Sun will be as shown in the figure below What are the magnitude in N and direction of the force experienced by the Moon in degrees below the Sun Moon line due to the Sun and the Earth The mass of the Moon is 7 35 x 1022 kg the Earth has a mass 5 97 x 1024 kg and th Sun has a mass 2 00 x 1030 kg In the figure the distance from the Moon to the Earth is 3 84 x 108 m and the distance from the Moon to the Sun is 1 50 x 10 m magnitude direction Sun N o below the Sun Moon line Moon Earth

9 A car goes around a curve on a road that is banked at an angle of 32 00 Even though the road is slick the car will stay on the road without any friction between its tires and the road when its speed is 28 0 m s What is the radius of the curve

Madison and Carson sit on a long uniform log supported at its center Madison weighs 420 N and sits 1 3 m from the center of the log If Carson weighs 610 N a what distance from the center of the log must he sit to keep the log balanced 1 9 m 0 53 m 1 2 m 0 77 m O 0 90 m

Which of the following reactions to a natural fear such as a nightmare could indicate a social emotional developmental delay A child immediately falls back to sleep A child talks about the nightmare in the morning A child does not respond to an adult s reassurances A child does not want to sleep with his her favorite stuffed animal

Credit scores will look at all of the following EXCEPT a level of delinquencies b proportion of revolving balances to credit limits c time since last delinquency d borrower s gender

An object 4 0 cm tall is placed 6 0 cm in front of a diverging lens whose focal length is 2 0 cm Use ray tracing to find a the location of the image b the orientation of the image c the height of the image 4 0 cm 6 0 5 0 4 0 3 0 F 2 0 1 0 F

A person walks 35 0 north of east for 3 30 km How far due north and how far due east would she have to walk to arrive at the same location km north east km

An 1290 W toaster and an 943 W microwave oven are connected in parallel to the same 15 0 A 120 V circuit HINT a Find the toaster s resistance R in ohms 0 b If the microwave fails and is replaced what maximum power rating in W can be used without tripping the 15 0 A circuit breaker W

25 What does the astronaut observe Note The Moon has no atmosphere As shown in the diagram below an astronaut on the Moon is holding a baseball and a balloon The astronaut releases both objects at the same time 1 0 m 1 0 m O The baseball falls slower than the balloon O The baseball falls faster than the balloon O The baseball and balloon fall at the same rate The baseball and balloon remain suspended and do not fall 3 points 26 Which of the following is not a simple machine 3 points

29 What two simple machines does the wheelbarrow use Base your answer to the following question on the drawing of a wheel barrel below What two simple machines does the wheel barrow use A wedge and a pulley A lever and a wheel and axle A pulley and a screw 3 points An inclined plane and a wheel and axle

The equation shows neutralization of an acid and a base to produce a salt and water 2HCl Na 0xNaCl H O Which value of x will balance thei equation

D Which of the following remains constant in projectile motion The horizontal component of the velocity The height The range The speed The vertical component of the velocity

The figure below shows a capacitor with capacitance C 25 0 F and a resistor with resistance R 40 0 kn connected in series to a battery with E 15 0 V The circuit has a switch which is initially open C S R a What is the circuit s time constant in s 00 b After switch is closed for one time constant how much charge in C is on the capacitor C

Vhen discussing concerns about a possible developmental delay with a child s parent a child care provider should NEVER do which of the following OBe positive and optimistic O Avoid comparisons between children O Concentrate on milestones Judge the parents

football is kicked at 22 m s at an angle of 32 degrees above the horizontal How long is it in the air 2 4 s 0 72 s 4 0 s 3 3 s

The baseball and balloon remain suspended and do not fall 26 Which of the following is not a simple machine O lever O pulley Owheel and axle Ospring 27 Identify the type of machine being used in the diagram below 3 p By pushing down at point F the box at the other end can be raise being used in the diagram below

27 Identify the type of machine being used in the diagram below By pushing down at point F the box at the other end can be raised being used in the diagram below box O lever O screw O wheel and axle O inclined plane 3 points F 28 The truck driver is loading the truck by sliding boxes up the wooden 3 points boards The wooden boards are being used as

12 A tennis ball whose mass is 0 058 kg is struck by a racket It was traveling initially at 35 m s and the impact causes it to leave Craveling at 40 m s in the opposite direction If it was in contact with the racket for 0 050s what average force did the racket exert on the wall O 87 N O 114 N O 70 N 36 N

boards The wooden boards are being used as The drawing below shows the back of a truck Truck Bed levers inclined planes Wooden board Box points

19 20 21 22 K Ca Sc Ti 37 38 39 Rb Sr Y 55 56 Cs Ba Se 87 88 Fr Ra w 23 V 24 25 20 27 28 29 30 31 32 33 34 35 36 Cr Mn Fe Co Ni Cu Zn Ga Ge As Se Br Kr Jumpe Hold Dow 40 41 42 43 44 45 46 47 48 49 50 51 52 Zr Nb Mo Tc Ru Rh Pd Ag Cd In Sn Sb Te Me 72 73 74 75 76 77 Hf Ta W Re Os Ir M LAM HA 78 79 80 81 Pt Au Hg TI Tl Puttin SHM 82 83 84 Pb Bi Po 104 105 106 107 108 109 110 111 112 113 114 115 110 117 118 Rf Db Sg Bh Hs Mt Ds Rg Cn Nh Fl Mc Lv Ts Og Harak HA H 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 La Ce Pr Nd Pm Sm Eu Gd Tb Dy Ho Er Tm Yb Lu Dele Si Porn WEBA e She The www 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 Ac Th Pa U Np Pu Am Cm Bk Cf Es Fm Md No Lr Wawi Spleten haw Bran fred AN 6 In the periodic table the number above the symbol for each element represents O the number of neutrons in an atom of the element O 53 54 I Xe ww the number of protons in an atom of the element 85 86 At Rn NA O the combined number of protons and neutrons in an atom of the element AV 3 points

15 Which car traveled the fastest Car 1 O Car 2 Car 3 Car 4 The graph below shows the distance and time traveled by four cars Distance and Time Traveled Distance km 500 400 300 200 100 Car 1 Car 2 Car 3 Car 4 2 3 4 Time hours 15

6 A jogger runs south for 500 m turns west for 250 m and then runs north for 100 m before stopping to rest What is her vector displacement relative to her starting point 438 m at 47 degrees S of W 472 m at 32 degrees W of S O 400 m at 24 dergees S of E O 350 m at 68 degrees S of W O 223 m at 45 degrees S of W

Ogravity O energy O a force O motion 17 Which of the following is a unit of force kilogram Onewton kg m sec m sec2

8 A kicker attempts a field goal from the 40 yard line which is 45 1 m from the goal posts If the ball is kicked at 37 degrees above the horizontal what initial velocity is necessary if it is to clear crossbar which is 3 0 meters above the ground O 22 6 m s O 14 5 m s O 34 3 m s O 17 2 m s O 30 8 m s

11 A baseball catcher throws a baseball vertically upward and catches it in the same sport when it returns to its mitt At what point in the ball s path does it experience zero velocity and a non zero acceleration at the same time at the top of its trajectory the instant it leaves the catcher s hand midway on the way up all the above must be true the instant before it arrives at the catcher s mitt

In the graph of displacement versus time the slope of the line at any point is the maximum displacement acceleration minimum displacement average velocity

Which one of these reasons does not explain the growing discontent with the leadership of the Umayyads O The marginalization of the Shia the Persians and the non Arabs from political leadership O The betrayal of the concept of Shura and its ability to elect the best leader of the Umma O The contrast between the humble lifestyles of Mohammed and the Ummayyad caliphs O moving the capital of the caliphate from Medina to Damascus

Base your answers to questions 51 through 53 on the information below and on your knowledge of physics A toy launcher that is used to launch small plastic spheres horizontally contains a spring with a spring constant of 50 newtons per meter The spring is compressed a distance of 0 10 meter when the launcher is ready to launch a plastic sphere 51 Determine the elastic potential energy stored in the spring when the launcher is ready to launch a plastic sphere 1 52 53 The spring is released and a 0 10 kilogram plastic sphere is fired from the launcher Calculate the maximum speed with which the plastic sphere will be launched Neglect friction Show all work including the equation and substitution with units 2