Basic Physics Questions and Answers

Proper length is a the length measured by an observer who is stationary relative to the object being measured Ob the same as length measurements in other inertial reference frames c always less than the length in other inertial reference frames d the length measured by an observer who is moving relative to the object being measured

An electron m 9 11 x 10 31 kg travels through the large hadron collider and is accelerated to 0 991 c What is the magnitude of the relative momentum a 26 7 x 10 30 kg m s Ob 2 22 x 10 kg m s c 2 02 x 10 21 kg m s d 2 85 x 10 21 kg m s

An electron moves in the y direction with a speed of 1 0x107 m s Its speed can be measured to a precision of 0 50 With what precision can you simultaneously measure its position 0 91 m 5 7 10 10 m 1 2 nm

How many different types of leptons exist O a 6 Ob 2 c 3 d 4

If the maximum wavelength to eject an electron from a particular metal is 2 39x107 m what is its work function 3 69 eV 4 25x10 19 ev 8 32x10 18 ev

What is the de Broglie wavelength for a proton moving at 1 12x106 m s The mass of a proton is 1 67x10 27 kg 3 54x10 13 m 4 86x10 12 m 3 95x10 12 m 1210 10m

wwwwww The block is pulled to the right a distance A 0 120 m from its equilibrium position the vertical dashed line and held motionless The block is then released from rest a At the instant of release what is the magnitude of the spring force in N acting upon the block N b At that very instant what is the magnitude of the block s acceleration in m s m s Need Help c In what direction does the acceleration vector point at the instant of release Toward the equilibrium position i e to the left in the figure The direction is not defined i e the acceleration is zero Away from the equilibrium position i e to the right in the figure You cannot tell without more information 1 Points Read I Viewing Saved Work Revert to Last Response MY NOTES ASK YOUR TEACHER A spring is hung from a ceiling and an object attached to its lower end stretches the spring by a distance d 4 70 cm from its unstretched position when the system is in equilibrium as in the figure below If the spring constant is 40 5 N m determine the mass of the object DETAILS SERCP11 13 1 P 004 PRACTICE ANOTHER

12 In 2020 a 20 year old astronaut leaves her twin on Earth and goes on a rocket to explore the galaxy The rocket moves at 2 7 x 10 m s during the voyage It returns to Earth in the year of 2050 a Using relativity calculate the age of the returning astronaut T I 2 b Find the length of the rocket in Earth s frame of reference when it is moving given that the rest length is 120 m assume you are a stationary observer viewing the rocket from the side A 3 c Find the relativistic mass of the rocket when it is moving given that the rest mass is 150 000 kg A 3 4

Which of the following forces does not affect elementary particles a Electromagnetism b Strong nuclear c Weak nuclear d Gravity

Proper time is a the time interval between two events that occur at different locations b always greater than time in other inertial reference frame c the time interval between two events that occur at the same location d the same as time measurements in other inertial reference frames

In a direct democracy if the people vote to make smoking illegal smoking is still legal becomes illegal O Congress considers the vote before any laws are passed Representatives may or may not vote to make smoking illegal Osmoking

The Work Function is measured in which Sl unit a Joules Ob Volts c Coulombs d Amperes

10 A typical Hurricane that is 665km across has 5 13 x10 kg of water that is evaporated from the surface of to fuel the hurricane when this water condenses from steam 100 C to water 100 C 1 16x10 kJ Hurricanes are not found between 0 and 5 latitude because there is not enough spin effect because it is too close to equator What is the name of the Spin effect which is caused by the Earth s rotation Hurricanes also need winds in uniform direction to help their formation Name the uniform wind found between 0 and 30 latitude 11 A hot water tank heats 200kg 200liters of water from 16 C to 60 C How much energy is that If that energy is used to lift the water all 200kg how high would it get Remember E potential mgh What is the bigger problem for water in a high rise lifting it or heating it 0711 88 x10 m or 18 8km

A flying saucer is hurdling through space near the speed of light Prior to taking off it was measured to be 100 m in diameter If a stationary observer tried to measure it now they would find a It has a diameter equal to 100 m b It has a diameter slightly greater than 100 m c It has a diameter less than 100 m d It has a diameter much greater than 100 m

Figure 10B 790 Q ww R 8 6 kQ 1 kQ R R 2 2kQ 32 V www R4 630 Q www Rs

You are traveling on a spaceship at 0 80 c You measure the length of your ship to be 72 m What is the proper length of the ship a 120 m b 72 m c 43 2 m d 43 m

shown in the figure below Need Help CK 15 x 0 x x a Find the the work required to stretch the spring M b Find the speed the block has as it passes through equilibrium m s Read It k Watch It 1 Points DETAILS A student pushes the 1 75 kg block in the figure below against a horizontal spring compressing it by 0 170 m SERCP11 13 2 P 011 x 0 I Xmax MY NOTES m ASK YOUR TEACHER U 0 y 0 PRACTICE ANOTHER

A 0 40 kg football is thrown from a height of 1 6 m with an initial velocity of 150 m s R35 U How far will the ball travel horizontally when it lands on the ground

Outline the hierarchy of the California Court System How does one obtain the position of Chief Justice of the California Supreme Court What is the name of the Court s current Chief Justice

11A What type of wave is light and how is light energy propagated through space How are these types of waves created for example with an oscillator

9 A magnetic field is 2 2 T down a Find the magnetic force on a proton moving at 3 0 x 10 m s east in the field T I 2 b Find the radius of the circular path of the proton T I 2

Biology and climate change a Explain how UV radiation can affect cells i ii b Explain What part of a cell can UV radiation affect Explain how too much UV radiation can cause skin cancer how too much heat can affect the human body as a whole i What happens to the human body or the systems in the human body if one were

4 Compare Earth s climate with any another planet in the solar system Explain why they have different temperatures Make sure to mention the distance from the sun Make sure to mention the different atmosphere make up focusing on greenhouco b

3A A canoe traveling at 60 0 km h N with respect to the water ends up travelling 30 0 km h N 45 E with respect to the shore due to the current Use your knowledge of vector components to calculate the current s velocity

a b C ge What part of the electromagnetic spectrum does the sun give off i Which one hits the Earth the most How many types of UV radiation are there i Are all three types of UV radiation bad for humans What is the ozone layer i What is the job of the ozone layer ii What is happening to the ozone layer iii Explain what the job of the ozone layer is

Part 1 Research the following information regarding climate change Max 1 2 Slides What is climate change What is the definition i ii What has been happening to the Earths climate Explain one way we have been able to measure climate change

1 What equation is the equivalent of Newton s second law Give the meaning of each symbol in the equation and state which rotational quantities are analogous to which linear quantities

8 To obtain the current gain B of a transistor when it is in CE mode we use a its input characteristics b its current transfer characteristics c its output characteristics d any one of the above three characteristics

HYDRAULIC LIFT In the figure below a hydraulic lift has one piston of diameter 8 0 cm and the other piston of diameter 40 cm What force in N must be applied to the smaller piston to obtain a force of 14 000 N weight of the car at the larger piston original force F1 P A P A1 area A area A2 fluid Pascal s principle P1 P2 P A 2012 Encyclop dia Britannica Inc

Air is filled in a tube of the wheel of a car at 27 C and 2 atm pressure if the tube is suddenly bursts the final temperature of air will be y 1 5 21 3 1 251 Question Type Single Correct Type 1 2 19 Physics 3 4 33 C 0 C 21 6 C English 240 C

3 A particle moves with constar speed v along a regular hexagor ABCDEF in the same order Then the magnitude of the average velocity for its motion from A to O O OF is v 5 OC is 4v 3 OF is v 6 OB is 6v

of length L and mass M is placed horizontally on a frictionless horizontal surface as shown A second identical rod AB which is also placed horizontally perpendicular to CD on the same horizontal surface is moving along the surface with a velocity v in a direction perpendicular to rod CD and its end B strikes the rod CD at end C and sticks to it rigidly Then V A velocity of centre of mass of the system just after impact is 4 3v B the angular speed of system just after collision is 5L e velocity of centre of mass of the system just after impact is 5v D the o angular speed of system just after collision is 3L NI A B

A rod of height h is placed in a beaker of same radius The height of the beaker is 3 times its radius An observer sees the top end of the rod through a pin hole see figure When the beaker is filled with a liquid of refractive index upto a height 2h he can see the lower end of the rod Find the value of

A hemisphere bowl of radius R is completely filled with liquid of density d Atmospheric pressure is Po The vertically down wards components of the pressure force applied by liquide on the half side curved wall of the hemisphere is A B 3Rdg P ade R 4 2 TR 6 3Po 2Rdg

quartz crystal is subjected to alternating electric field which leads to production of ultrasonic sound me thickness of crystal is 0 0005 m and density 2650 kg m3 Given Young s modulus Y 7 9 X 10 power D N m2 Calculate velocity of ultrasonic sound in crystal OPTIONS 1246 m s 2456 m s 5460 m s

Potential due to a charge q at its own location is not defined it is infinite In the expression qV r for potential energy of a charge q V r is the potential due to external charges and not the potential due to q As seen in point 5 this expression will be ill defined if V r includes potential due to a charge q itself

Q 115 An object of mass m is tied to a light string Q 115 wound around a pulley that has a moment of inertia I and radius R The axis of pulley is frictionless and the string does not slip on the pulley then graph showing variation of a g versus V mR may be Here a is acceleration of the object 1 3 MF MA MA met g frem 38 fixed a for at ar fandt is not a faur R 1 ford di ford a g vs I mR Rada 1 3 ala MR MR 2 L V MR MR

8 11 Questions 8 10 refer to the following circuit 8 The resistance of the motor is a 24 92 b 12 Q2 c 622 d 222 9 The power produced by the motor is a 24 watts b 12 watts A c 6 watts d 2 watts c 60 J d 20 J 12 V X 11 The amount of charge passing through the motor in 10 seconds is 240 C b 120 C c 60 C A 2 0 amperes Motor 10 If all the electrical energy is converted to mechanical energy to lift the mass the gravitational potential energy gained by the mass in 10 seconds would be a 240 J b 120 J A Pulley voltage Mass

3 Radioactive isotope Carbon 14 decays at a rate proportional to the amount present If the decay rate is 12 10 per thousand year and the current mass is 135 2 mg what will the mass be 2 2 thousand years from now

ASSAGE quartz crystal is subjected to alternating electric field which leads to production of ultrasonic sound The thickness of crystal is 0 0005 m and density 2650 kg m3 Given Young s modulus Y 7 9 X 10 power 0 N m2 Read the following pas options Marks 2 Calculate frequency of ultrasonic sound OPTIONS

Assertion When an object is placed between two plane parallel mirrors then all the images found are of equal AIIMS 2016 intensity Reason In case of plane parallel mirrors only two images are possible 1 If both Assertion Reason are true the Reason is a correct explanation of the Assertion 2 If both Assertion and Reason are true but Reason is not a correct explanation of the Assertion 3 If Assertion is true but the Reason is false 4 If Assertion Reason both are false

6 Two blocks are connected by an inextensible string The string passes over a weightless and frictionless pul ley Fig 1 55 Taking the mass of the string to be zero find the 55 kg 30 60 35 kg Fig 1 55 acceleration of the blocks and the tension in the string Ans 0 306 m s 2 286 33 NI

A proton is kept at rest A positively charged particle is released from rest at a distance S in its field Consider two experiments one in which the charged particle is also a proton and in another a positron In the same time t the work done on the two moving charged particles is 1 same as the same force law is involved in the two experiments 2 less for the case of a positron as the positron moves away more rapidly and the force on it weakens 3 more for the case of a positron as the positron moves a larger distance away 4 same as the work is done by a charged particle on the stationary proton

A bullet is fired with a velocity of 200 m s horizontally from the gun at target 80 m away The height above the target at which the bullet should be aimed to hit the target will be 25 cm 30 cm 80 cm 90 cm

SAGE Ostance with the FCC lattice has density of 6200 kg m3 The molecular weight of that substance is amu The atomic radius will be OPTIONS 6 41 Angstrom

Miller introduced a system to designate a plane in a crystal Miller indices group of three numbers that indicates the orientation of a plane or set of parallel planes of atoms in a crystal Read the following passage to answer the given questions based on it Choose th correct options Marks 1 If a plane is parallel to any one of the three coordinate axis OPTIONS Miller index for that direction is zero Miller index for that direction is 1 r1 Miller index for that

It is hotter for the same distance over the top of a fire than it is in the side of it mainly because Question Type Single Correct Type 1 06 Physics 2 3 Air conducts heat upwards Heat is radiated upwards Convection takes more heat upwards English None of these

122 A U tube having uniform bore and vertical Q 122 Ufo ter limbs is filled partially with mercury PHg 13 6 P 13 6 g cc Re g cc Water is poured into one of its limbs such that height of water column is 27 2 cm The rise of mercury in the other limbs is 1 1 cm 2 2 cm 3 27 2 cm 4 13 6 cm 1 1 cm 3 27 2 cm OR T 27 2 cm 2 2 cm 4 13 6 cm

The normal reaction N for a vehicle of 800 kg mass negotiating a turn on a 30 banked road at maximum go possible speed without skidding is x 10 kg m s mathongo mathongo mathongo mathongo mathongo mathongo 1 10 2 2 7 2 athongo mathongo mathongo mathongo mathongo mathongo 3 12 4 4 6 96 mathongo mathongo mathongo mathongo mathongo mathongo

A rocket is projected vertically upward from ground with resultant acceleration of 20 m s in upward direction After 10 seconds engine of the rocket is swithced off and rocket falls under gravity After how much further time the direction of the velocity changes If your N answer is N fill