A constant mass undergoes uniform acceleration when the resultant force acting on it Ais proportional to the displacement from a fixed point. Bis proportional to the velocity. Cis zero. Dis constant but not zero. E increases uniformly with respect to time. 2. Two blocks, X and Y, of masses m and 2m respectively, are accelerated along a smooth horizontal surface by a force F applied to the block X, as shown in the diagram. [pic] What is the magnitude of the force exerted by block Y on block X during this acceleration? A 0B F/3C F/2D 2F/3E F 3. The e. m. f.
Eb of a battery is given by Eb = P/I where P is the power dissipated when a current I flows. The e. m. f. Ec induced in a coil by a changing magnetic flux is equal to the rate of change of flux, Ec = d? /dt. Which of the following is a unit for magnetic flux? A m s-1 AB m s-2 A-1C kg m2 s-2 AD kg m s2 A-1 E kg m2 s-2 A-1 4. A puck on a frictionless surface collides with a stationary puck. The pucks move as shown in the diagram. [pic] [pic] If the mass of the puck moving before the collision is 0. 30 kg, what is the mass of the second puck A 0. 20 kgB 0. 8 kgC 0. 40 kgD 0. 49 kgE 1. 0 kg 5. A small ball of weight W is suspended by a light thread. When a strong wind blows horizontally exerting a constant force F on the ball, the thread makes an angle ? to the vertical as shown in the diagram. [pic] Which of the following equations correctly relates ? , F and W? Acos ? = F/W Bcos ? = W/F Csin ? = F/W Dtan ? = F/W Etan ? = W/F 6. A linear accelerator sends a charged particle along the axis of a set of coaxial hollow metal cylinders as shown in the diagram. [pic] The particle travels at constant speed inside each cylinder.
The Essay on Force And Perfectly Elastic Question
Question no 9) A package is dropped from a helicopter moving upward at 15m/s If it takes16 sec before the package strikes the ground, how high above the ground was the package when it was released if air resistance is negligible? Ans) 1000m Question no. 11) If A -B = 0, then the vectors A and B have equal magnitudes and are directed in the opposite directions from each other. Ans) False Question ...
The particle crosses the gaps between the cylinders at equal time intervals, and at each gap its kinetic energy increases by a fixed amount. Which of the graphs best represents the way in which v, the velocity of the particle varies with d, the distance along its track? [pic] [pic] 7. The diagram shows two bodies X and Y connected by a light cord passing over a light, free-running pulley. X starts from rest and moves on a smooth plane inclined at 30 o to the horizontal. [pic] What will be the total kinetic energy of the system when X has traveled 2. 0 m along the plane? (g = 9. 8 m s-2).
A 20 JB 59 JC 64 JD 132 JE 137 J . When a satellite in on the surface of a planet, it experiences a gravitational force W. What is the gravitational force when the satellite is at a height R/50, where R is the radius of the planet? A 1. 02 WB 1. 00 WC 0. 98 WD 0. 96 WE 0. 00 W 9. When the aircraft Concorde is moving in a horizontal plane at a constant speed of 650 m/s, its turning circle has a radius of 80 km. What is the ratio of the centripetal force to the weight of the aircraft? A 8. 3 x 10-4B 0. 54C 1. 9D 52E 540 10. A body performing simple harmonic motion has a displacement x given by the equation x = 30 sin 50t, where t is the time in seconds.
What is the frequency of oscillation? A 0. 020 HzB 0. 13C 8. 0 HzD 30 HzE 50 Hz 11. In a fairground shooting game a gun fires at a moving target. The gun fires by itself at random times. The player has to point the gun in a fixed direction, and the target moves from side to side with simple harmonic motion. [pic] At which region should the player take a fixed aim to score the greatest number of hits? A3 Beither 1 or 5 Ceither 2 or 4 Dany of 1, 3, or 5 Eany of 1, 2, 3, 4, or 5 12. The diagram shows two oscillations. [pic] What is the phase difference between the two oscillations?
A ? /4 radB ? /2 radC 3/4 ? radD ? radE 3/2 ? rad 13. Progressive waves of frequency 300 Hz are superimposed to produce a system of stationary waves in which adjacent nodes are 1. 5 m apart. What is the speed of the progressive waves? A 100 m/sB 200 m/sC 450 m/sD 900 m/sE 1800 m/s 14. The grating spacing d of a diffraction grating is the distance between successive slits and should be uniform across the grating. The diagram shows the formation of the first order spectrum when parallel rays of monochromatic light fall perpendicularly on a substandard diffraction grating PQR.
The Essay on Electrical Pressure Resistance Current Wire
Electricity has three features that include current, voltage and resistance. Current is the flow of electrons round a circuit that is measured by the ammeter in amps (A). Whilst the voltage, refer to as potential difference, is the driving force that circulates the current around the circuit that acts like an electrical pressure. The unit of measurement for this is Volts (V), which is measured by ...
For the part of the grating between P and Q, the angle of deviation ? is constant and the diffracted rays emerge parallel. However, from Q to R, ? falls progressively as shown in the graph. [pic] Which graph best shows how the grating interval d varies with x, the distance from P? [pic] 15. In the circuit shown, resistors X and Y, each of resistance R, are connected to a 6 V battery of negligible internal resistance. A voltmeter, also of resistance R, is connected across Y. [pic] What is the reading of the voltmeter? A zeroB between zero and 3 VC 3 V D between 3 V and 6 VE6 V 6. Three resistors of resistance 1? , 2? , and 3? respectively are used to make the combinations X, Y, and Z shown in the diagrams. [pic] Which of the following gives the combinations in order of increasing resistance? A XYZB XZYC YXZD ZXYE ZYX 17. A current flows in a wire of circular cross-section with the free electrons traveling at drift velocity v. What is the drift velocity for the same current in a wire of the same material but half the radius? A v/4B v/2C vD 2 vE 4 v 18. A capacitor of capacitance 1. 0 ? F carries a charge of 15 mC. It is discharged through a 25 ? resistor.
What is the maximum current during the discharge? A 0. 60 AB 1. 2 AC 300 AD 600 AE 1200 A 19. The charge on the uranium nucleus is 1. 5 x 10-17 and the charge on the ? -particle is 3. 2 x 10-19 c. What is the electrostatic force between a uranium nucleus and an ? -particle separated by 1. 0 x 10-13 m? A 4. 3 x 10-33 NB 4. 3 x 10-20 NC 4. 3 x 10-13 ND 4. 3 N E 4. 3 x 1010 N 20. The diagram shows three long straight wires P and Q and R normal to the plane of the paper. Wires P and R carry currents directed into the plane of the paper, and wire Q carries a current directed out of the paper.
All three currents have the same magnitude. [pic] Which arrow best shows the direction of the resultant force on wire P? 21. The circuit diagram shows a full-wave rectifier with a smoothing capacitor. [pic] The currents I1 and I3 vary with time as shown below. Which of the graphs A-E best represents the variation with time of the current I2? [pic] 22. How does negative feedback affect the gain and bandwidth of an operational amplifier? effect on gaineffect on bandwidth Aincreasedunchanged Bincreaseddecreased Cunchangedincreased Ddecreasedincreased Edecreaseddecreased 23.
The Essay on The Photoelectric Effect Light Energy Electrons
Introduction The Quantum Theory was the second of two theories which drastically changed the way we look at our physical world today, the first being Einstein " theory of Relativity. Although both theories revolutionized the world of physics, the Quantum Theory required a period of over three decades to develop, while the Special Theory of Relativity was created in a single year. The development ...
A uniform, vertical wire is stretched by hanging a mass from its lower end. Which of the following does not affect the strain in the wire? Athe stress Bits unstretched length Cits cross-sectional area Dthe load applied Ethe Young modulus of the metal 24. When one junction X of a thermocouple is placed in melting ice and the other junction Y in steam at 100 oC, the e. m. f. is 6. 0 mV. Junction Y is removed from the steam and is placed in a liquid bath at a constant temperature, junction X remaining in the ice. The e. m. f. is now -1. 5 mV. What is the temperature of the bath on the centigrade scale of this thermometer?
A -75oB -25oC 25oD 75oE 125o 25. What is the internal energy of a system? Athe maximum amount of work that can be extracted from the system Bthe sum of kinetic energies and potential energies of the molecules Cthe total amount of work which has been done on the system Dthe thermal energy needed to raise the temperature of the system by one kelvin Ethe thermal energy which remains in the system when it is cooled to absolute zero 26. A mass of an ideal gas of volume V at pressure p undergoes the cycle of changes shown in the graph. [pic] At which points is the gas coolest and hottest? oolest hottest AXY BYX CYZ DZX EZY 27. Two thermally conducting blocks are maintained at temperatures which differ by 20 K. The blocks are joined by two cylindrical bars each of length 0. 40 m and made from a material of thermal conductivity 25 W m-1 K-1. The cross-sectional areas of the bars are 1. 0 x 10-4 m2 and 4. 0 x 10-4 m2 respectively. The remainder of the space between the blocks is filled with insulating material as shown in the diagram. [pic] What is the rate of transfer of thermal energy between the two blocks? A 0. 13 WB 0. 25 WC 0. 31 WD 0. 50 WE 0. 3 W 28. An electron is projected with velocity v into a region where there exists a uniform electric field of strength E perpendicular to a uniform magnetic field of flux density B. If the electron velocity is to remain constant, v must be Aof magnitude B/E and parallel to B Bof magnitude E/B and parallel to E Cof any magnitude but at 45o to both E and B Dof magnitude B/E and perpendicular to both E and B. Eof magnitude E/B and perpendicular to both E and B. 29. When a clean metal in a vacuum is irradiated with monochromatic ultra-violet radiation, electrons are emitted.
The Essay on Energy Flow Systems Columbia River
Energy Flow Systems Richard White's Organic Machine, and William Cronon's Changes in the Land, both examine environments as energy flow systems. The energy flow model was utilized by the authors to explain relationships within ecosystems. Richard White's thesis is to examine the river as an organic machine, a san energy system that, although modified by human intervention, maintains it's natural, ...
Which of the following will double if the intensity of the ultra-violet radiation is doubled? Athe maximum speed of the electrons Bthe maximum kinetic energy of the electrons Cthe rate of emission of the electrons Dthe threshold frequency of the metal surface Ethe work function of the metal surface 30. A radioactive source consists of 6. 4 x 1011 atoms of a nuclide of half-life 2 days. A second source consists of 8 x 1010 atoms of another nuclide of half-life 3 days. After how many days will the numbers of active atoms in the two sources be equal? A 6B 9C 12D 15E 18
