# Sandhya

Popular questions and responses by Sandhya
1. ## physics

A rectangular trough, 2.0 m long, 0.50 m wide, and 0.50 m deep, is completely full of water. One end of the trough has a small drain plug right at the bottom edge. When you pull the plug, at what speed does water emerge from the hole? (in m/s)

2. ## Physics

A 600-kg car is going around a curve with a radius of 120 m that is banked at an angle of 25.0° with a speed of 30.0 m/s.The coefficient of static friction between the car and the road is 0.300. What is the force exerted by friction on the car?

3. ## physics

A wheel of radius 0.5 m rotates with a constant angular speed about an axis perpendicular to its center. A point on the wheel that is 0.2 m from the center has a tangential speed of 2 m/s. (a) Determine the tangential speed of a point 0.4 m from the center

4. ## Atomic physics

1)What is the longest wavelength light capable of ionizing a hydrogen atom in the n = 6 state 2)a. Calculate the energy of the electron in the ground state of single ionized helium, which has an atomic number Z = 2. b. Calculate the radius of its

5. ## physics

a ball rolls down a roof that makes an angle of 30 to horizontal.it rolls off the egde with a speed of 5.00m/s.distance to the ground from that point is 7.00m a)how long is the ball in the air b)how far from the base of the house does it land? c)what is

6. ## physics

A mine car, mass= 440 kg rolls at a speed of 0.50 m/s on a horizontal track. A 150-kg chunk of coal has a speed of 0.80 m/s when it leaves the chute. The chunk of coal falls into the car at a 25 degree angle. Determine the velocity of the car/coal system

7. ## physics

1.The greenish blue of water is evidence for the A) interaction between green and blue frequencies of light. B) reflection of red light. C) reflection of greenish-blue light. D) absorption of greenish-blue light. E) absorption of red light. 2.Atmospheric

8. ## Chemistry

A 10.0-mL solution of 0.300 M NH3 is titrated with a 0.100 M HCl solution. Calculate the pH after the following additions of the HCl solution: a) 0.00 mL b) 10.0 mL c) 20.0 mL c) 30.0 mL d) 40.0 mL **I know how to solve the problem but I keep getting

9. ## physics

A sailor strikes the side of his ship just below the waterline. He hears the echo of the sound reflected from the ocean floor directly below 1.85 s later. How deep is the ocean at this point?

10. ## physics

Consider two closed systems A and B. System A contains 3000 kJ of thermal energy at 20°C, whereas system B contains 200 kJ of thermal energy at 50°C. Now the systems are brought into contact with each other. Determine the direction of any heat transfer

11. ## physics

An object of mass m is hanging by a string from the roof of an elevator. We want to compare the tension in the string due to the weight of the object under various conditions. Which statements are true? Choices: True, False. A. If the elevator is moving

12. ## physics

A 1520-N crate is to be held in place on a ramp that rises at 30.0° above the horizontal. The massless rope attached to the crate makes a 22.0° angle above the surface of the ramp. The coefficients of friction between the crate and the surface of the

1) An old wooden tool is found to contain only 11.9 percent of 14C that a sample of fresh wood would. How many years old is the tool? 2) A specimen taken from the wrappings of a mummy contains 7.02 g of carbon and has an activity of 1.34 Bq. How old is the

14. ## physics

Consider two identical rooms, one with a refrigerator in it and the other without one. If all the doors and windows are closed, will the room that contains the refrigerator be cooler or warmer than the other room? Why?

15. ## Physics

A 4.60-m-long, 580 kg steel beam extends horizontally from the point where it has been bolted to the framework of a new building under construction. A 72.0 kg construction worker stands at the far end of the beam. What is the magnitude of the torque about

16. ## Physics

A thin brass ring of inner diameter 10cm at 20degrees C is warmed and slipped over an aluminum rod of diameter 10.01cm at 20degrees C. Assuming the average coefficient of linear expansions are constant, to what temperature must this combination be cooled

17. ## Physics

1. What is the best way to determine levelness? Plot Position versus Time and compare the linear fit from each direction of travel; slopes should be equal. See if the Acceleration versus Time for both directions are both zero. Plot the Acceleration versus

18. ## physics

A 25 ft long crane supported at its lower end by a pin is elevated by a horizontal cable. A 250 lb load is suspended from the outer end of the crane. The center of gravity of the crane is 10 ft from the pin and the crane weighs 200 lb. What is the tension

19. ## Physics

1.A spherical condenser has inner and outer spheres of radii a and b respectively. The space between the two is filled air. The difference between the capacities of the two condensers formed when outer sphere is earthed and when inner sphere is earthed

20. ## Physics

A 1500kg car travels at a constant speed of 22 m/s around a circular track that has a radius of 85 m. What is the average velocity of the car during one revolution?

21. ## Physics

A trapeze artist of mass m swings on a rope of Length L. Initially, the trapeze artist is at rest and the rope makes an angle theta with the vertical. a) Find the tension in the rope when it is vertical. Why does your result for part a depend on L in the

22. ## physics

A 50g ice cube is added to 110g of water in a 62g aluminum cup. The water and cup initially have a temperature of 23°C. Find the initial temperature of the ice cube such that all of the water is just turned to ice. Use the following specific heats: water

23. ## Atomic physics

5)a. Electrons accelerated by a potential difference of 12.23 V pass through a gas of hydrogen atoms at room temperature. Calculate the wavelength of light emitted with the longest possible wavelength. b. Calculate the wavelength of light emitted with the

24. ## Thermodynamics

5 mol of an ideal gas is kept at 394◦C in an expansion from 1 L to 5 L .How much work is done by the gas? Answer in units of J.Given: R = 8.31 J/K/mol ,

25. ## Atomic physics

1)Five possible transitions for a hydrogen atom are listed below: Select whether the atom gains or loses energy for each transition. a. Loses Gains ni = 6; nf = 4 Loses Gains ni = 4; nf = 2 Loses Gains ni = 5; nf = 3 Loses Gains ni = 2; nf = 5 Loses Gains

26. ## physics

A block of mass M is sliding down an inclined plane and is accelerating. Which of the following statements are true? Choices: True, False. A. The frictional force must be less than the component of Mg down the plane B. The normal force of the plane is

27. ## physics

If only a single nonzero force acts on an object, does the object accelerate relative to all inertial reference frames? Is it possible for such an object to have zero velocity in some inertial reference frame and not in another? If so, give a specific

28. ## physics

A 25 kg box slides, from rest, down a 9-m-long incline making an angle 15 degrees with the horizontal. The speed of the box when it reaches the bottom of the incline is 2.40 m/s. (a) What is the coefficient of kinetic friction between the box and the

29. ## Physics

Cosmic microwave background radiation fills all space with an average energy density of 4 x 10^-14 j/m^3.(a) Find the rms value of electric field associated with this radiation.(b) How far from a 7.5 kW radio transmitter emitting uniformly in all direction

30. ## physics

A double slit diffraction pattern is formed on a distant screen using mercury green light of wavelength 546.1 nm. Each slit has a width of 0.1 mm. The pattern shows that the 4th order interference maximum is missing. a) What is the separation of the slits?

31. ## college

A woman can see clearly her right eye only when objects are between 45 cm and 155 cm away. Prescription bifocals should have what powers so that she can see distant objects clearly(upper part) and be able to read a book 25 cm away(lower part) with her

32. ## college physics

Three blocks of mass 1kg,2kg and 3kg move on a frictionless surface and a horizontal force 46 N acts on the 3kg block.1kg and 2kg blocks are in contact with each other while 1kg and 3kg blocks are connected by a chord. (a) Determine the acceleration of the

33. ## physics

A 66.0 kg base runner begins his slide into second base when he is moving at a speed of 4 m/s. The coefficient of friction between his clothes and Earth is 0.70. He slides so that his speed is zero just as he reaches the base. (a) How much mechanical

34. ## physics

The number of significant figures in 0.00150 is ....

1) The number of radioactive nuclei in a particular sample decreases over a period of 15 days to one-seventeenth the original number. What is the half-life (in days) of these nuclei? 2) What is the activity of a sample of 14C that contains 1.22E+21 nuclei?

36. ## Math

Express the number 25 as a sum of two nonnegative numbers whose product is as large as possible.

37. ## physics

Imagine yourself seated on a wheeled desk chair at your desk. Consider friction forces between the chair and the floor to be negligible. However, the friction forces between the desk and the floor are not negligible. When sitting at rest, you push

38. ## physics

A daredevil on a motorcycle leaves the end of a ramp with a speed of 29.0 m/s as in the figure below. If his speed is 26.7 m/s when he reaches the peak of the path, what is the maximum height that he reaches? Ignore friction and air resistance.

39. ## Chemistry

A solution is made by mixing 5.00 × 102 mL of 0.167 M NaOH with 5.00 × 102 mL of 0.100 M CH3COOH. Calculate the equilibrium concentrations of H+, CH3COOH, CH3COO−, OH−, and Na+.

40. ## physics

1.A round wooden log of diameter 73cm floats with half of its radius above water. Determine the log’s density 2.An ideal gas doubles its volume in one of three different ways: at constant pressure, at constant temperature, and adiabatically. For each

41. ## physics

A bungee jumper with mass 69.5 kg jumps from a high bridge. After reaching his lowest point, he oscillates up and down, hitting a low point eight more times in 36.6 s. He finally comes to rest 24.3 m below the level of the bridge. Calculate the spring

42. ## physics

A rocket has an exhaust gas velocity of 2329 m/s and an expelled gas rate of 6761 kg/s. If it has a mass of 1.82 × 10^6 kg what is its initial acceleration ?

43. ## physics

A particle of charge Q is fixed at the origin of an xy coordinate system. At t = 0 a particle (m = 0.690 g, q = 4.75 µC) is located on the x axis at x = 20.0 cm, moving with a speed of 50.0 m/s in the positive y direction. For what value of Q will the

44. ## Physics

Identical twins, each with mass 56.2 kg, are on ice skates and at rest on a frozen lake, which may be taken as frictionless. Twin A is carrying a backpack of mass 12.0 kg. She throws it horizontally at 3.50 m/s to Twin B. Neglecting any gravity effects,

45. ## physics

1.The earth is constantly bombarded by cosmic rays, which are charged particles from outer space. moving vertically Find the force on one such cosmic ray− a proton that is instantaneously downward at 5.04 107 m/s at a point outside the atmosphere over

46. ## physics-Electric & magnetic fields

A proton traveling at 10^4 m/s in the positive x-direction, enters a region where there is uniform electric field of magnitude 10 v/m and a uniform magnetic field of magnitude 10^-2 T. The electric and magnetic fields are parallel and are in the

47. ## physics

A large uniform "butcher block" rests on two supports(one support at the left end of the block) and has a weight hanging from its end. The block has a mass of 100 kg and a length of 2 meters. If the hanging weight is 59 newtons, what is the minimum value

48. ## Physics-Optics

A woman can see clearly her right eye only when objects are between 45 cm and 155 cm away. Prescription bifocals should have what powers so that she can see distant objects clearly(upper part) and be able to read a book 25 cm away(lower part) with her

49. ## physics

A proton traveling at 10^4 m/s in the positive x-direction, enters a region where there is uniform electric field of magnitude 10 v/m and a uniform magnetic field of magnitude 10^-2 T. The electric and magnetic fields are parallel and are in the

50. ## physics

1)7Be decays with a half-life of about 53 d. It is produced in the upper atmosphere, and filters down onto the Earth's surface. If a plant leaf is detected to have 300 decays/s of 7Be, how many days do we have to wait for the decay rate to drop to 13.6/s?

51. ## physics

A large uniform "butcher block" rests on two supports(one support at the left end of the block) and has a weight hanging from its end. The block has a mass of 100 kg and a length of 2 meters. If the hanging weight is 59 newtons, what is the minimum value

52. ## Physics

Two men lifted a total mass of 653.2 kg approximately 4 in. off the ground a total of 24 times. Estimate the total mechanical work done by the two men in lifting the boat 24 times, assuming they applied the same force to the boat during each lift. (Neglect

53. ## computer

which of the following is a browser

54. ## physics

Peggy drives from Cornwall to Atkins Glen in 46 min. Cornwall is 73 km from Illium in a direction 29° west of south. Atkins Glen is 26.3 km from Illium in a direction 20° south of west. Use Illium as your origin. Find the displacement during the trip in

55. ## physics

The hydrogen atom consists of a proton with an electron in orbit about the proton. The laws of quantum mechanics determine that the radius of this orbit is 5.29x10^-11 meters. Therefore, calculate a) The electric potential the electron experiences. b) The

56. ## physics

Two particles are created in a high-energy accelerator and move off in opposite directions. The speed of one particle, as measured in the laboratory, is 0.700 c , and the speed of each particle relative to the otheris 0.920 c . What is the speed of the

57. ## physics

1.A truck with a mass 5000 kg is heading East at 20 m/s. Meanwhile a car with a mass 2500 kg is heading North at 30 m/s. The two vehicles collide at an intersection, get stuck together, and the wreckage keeps moving to some direction.find the speed of the

58. ## maths

find the sum to 20 terms of an A.P. whose 4th term is 7 and 7th term is 13

59. ## physics

5)a. Electrons accelerated by a potential difference of 12.23 V pass through a gas of hydrogen atoms at room temperature. Calculate the wavelength of light emitted with the longest possible wavelength. b. Calculate the wavelength of light emitted with the

60. ## physics

A 1-kg mass hangs by a string from a disk with radius 5.1 cm which has a rotational inertia of 5 × 10-5 kg•m2. After it falls a distance of 1.4 meters, how fast is it going? What is the angular velocity of the disk?

61. ## physics

1.In a cathode ray tube, electrons are accelerated from rest by a constant electric force of magnitude 6.56 x 10*-17 N during the first 1.87 cm of tube's length; then they move at essentially constant velocity another 45.0 cm before hitting the screen.

62. ## physics

If only external forces can cause the center of mass of a system of particles to accelerate, how can a car on level ground ever accelerate? We normally think of the car’s engine as supplying the force needed to accelerate the car, but is this true? Where

63. ## physics

. Ethyl alcohol has been added to 160 mL of water in a container that has a mass of 130 g when empty. The resulting container and liquid mixture has a mass of 510 g .What volume of alcohol was added to the water? (in mL)

64. ## physics

Two metal disks are taped to a meterstick. The mass of the meterstick is 460 grams. Disk 1 has a mass of 300 grams and is located at the 28 cm mark. Disk 2 has a mass of 500 grams and is located at the 64 cm mark. At what posi- tion along the meterstick

65. ## physics

1) Sound propagating through air at 30 degree Celsius passes through a vertical cold front into air that is 40 degree Celsius. If the sound has a frequency of 2400 Hz, by what percentage does its wavelength change in crossing the boundary? (2) What is the

66. ## physics

A proton traveling at 10^4 m/s in the positive x-direction, enters a region where there is uniform electric field of magnitude 10 v/m and a uniform magnetic field of magnitude 10^-2 T. The electric and magnetic fields are parallel and are in the

67. ## physics

1.Three masses, m1, m2, and m3, are lying on a plane without friction and are connected by a string. A force F is applied to the mass m1 so that the whole system accelerates along a straight line. What is the tension of the string T between the masses m1

68. ## physics

A microphone is located on the line connecting two speakers that are 0.546 m apart and oscillating 180degrees out of phase. The microphone is 2.00 m from the midpoint of the two speakers. What is the lowest frequency that produces an interference maximum

69. ## Physics

A flag pole consists of a 2.0 m long, 5.0 kg decorative ball on the end. What is the gravitational torque on the flag pole, calculated about an axis at the fixed end of the pole?

70. ## Nuclear physics

1) An old wooden tool is found to contain only 11.9 percent of 14C that a sample of fresh wood would. How many years old is the tool? 2) A specimen taken from the wrappings of a mummy contains 7.02 g of carbon and has an activity of 1.34 Bq. How old is the

71. ## physics

A straight horizontal rod A of mass 50 gm and length 0.5 m, is placed in a uniform horizontal magnetic field of 0.2 T, perpendicular to A. Calculate the current in A if the force acting on it just balances it weight.

72. ## physics

A car moving at a speed of approximately 176.5 km/h. 923 m in front of the car, there is a truck moving at a speed of 84.2 km/h in the same direction. 1.What is the name of the physical process that would occur if both vehicles kept moving at constant

73. ## Nuclear physics Repost

1) An old wooden tool is found to contain only 11.9 percent of 14C that a sample of fresh wood would. How many years old is the tool? 2) A specimen taken from the wrappings of a mummy contains 7.02 g of carbon and has an activity of 1.34 Bq. How old is the

74. ## Physics

1. A ball is projected horizontally from the edge of a table that is 4.0 meters high, and strikes the floor at a point 3.0 meters from a point on the floor directly below the edge of the table. The initial velocity of the ball as it is projected from the

75. ## Math

1.Approximate sqrt3 by applying Newton's Method to the equation (x^2-3) = 0 2.The equation (x^3-x-2) = 0 has one real solution for 1

76. ## physics

A uniform 2.00-m-long stick is raised at an angle of 30° to the horizontal above a sheet of ice. The bottom end of the stick rests on the ice. The stick is released from rest. The bottom end of the stick remains in contact with the ice at all times. How

77. ## physics

A clump of soft clay is thrown horizontally from 78.40 m above the ground with a speed of 27.0 m/s. Where is the clay after 4.5 s? Assume it sticks in place when it hits the ground. horizontal ....m from the launch position vertical ....m from the ground

78. ## Physics

Particle A has twice the mass of particle B, and carries three times the charge of B charge. Both particles are sent perpendicularly through a uniform magnetic field, each with the same kinetic energy. What is the ratio of the radius of evolution of

79. ## Physics

2)Identify the initial and final states if an electron in hydrogen emits a photon with a wavelength of 1282.0 nm. Enter the initial state first

80. ## physics

1.An elastic cord is 5.0m long and 1.0cm in diameter and acts as a spring with spring constant 70 N/m, what is the young's modulus for this material? 2.A heavy uniform beam of mass 8000 kg and length 2.0m is suspended at one end by a nylon rope of diameter

81. ## physics

The intensity of an earthquake wave is measured to be 6 x10 ^6 J ms at a distance of 50 km from its source. Calculate the intensity when it passed the point 4 km to source ? What is the rate energy passed through an area of 6 ms^2 at 4 kW?

82. ## physics

A coaxial cable has an inside conductor of radius 'a' carrying a current 'I'.The current returns as a uniform current through the outside conductor with a inside radius 'b' and outside radius 'c'.What is the magnetic field at a distance 'r' from the

83. ## physics(Antennas)

With regards to straight antennas and coiled antennas. Which one is better/more efficient at receiving, and why? Which one is better/more efficient at broadcasting, and why?

84. ## science

6.023*x10^21 electrons are present n a given amount of ammonium (NH3).How much amount of hydrogen is required to produce the sample of ammonia

85. ## physics

A snake is sunning itself on a rock. (a) If the snake is 0.3 m long, what is the approximate amount of radiation it absorbs from the sun in 10 minutes? (b) If no heat flows out of the snake via conduction or by evaporative cooling, how much does its

86. ## physics

One kilogram of water vapor at 200 kPa fills one side of a partitioned chamber. The right side is twice the volume of the left and is initially evacuated. Determine the pressure of the water after the partition has been removed and enough heat has been

87. ## physics

A one tonne moon obiter is to approach the moon and orbit through 270 degrees at an altitude of 100km. During this period its rockets are to be turned off. What is the required velocity of the obiter at the entry point to prevent the vehicle from crashing

88. ## physics

A bullet of mass ‘m’ traveling horizontally at a speed ‘v’ embeds itself in the centre of a block of wood of mass ‘M’, which is suspended by a light vertical string of length ‘l’. What would be the maximum inclination of the string with the

89. ## Physics

The magnetic field inside a solenoid is 8.617 mT. If this solenoid sits with its central axis perpendicular to a 30 mT magnetic field, what is the magnitude of the torque on the solenoid

90. ## Physics

You plan to build a large, cheap cyclotron using the Earth's magnetic fields(1x10^-4 T) and orbiting just above the Earth's atmosphere (radius 5.7 x10 ^6 m) What energy, in volts, should protons be given to just circle the earth? q= 1.6 x10^-19 C, m=

91. ## US HISTORY

from fdr's first inaugral speech ,how did he attempt to win the support of the american people for his leadership during the economic crisis of the great depression

92. ## physics

A speedboat heads west at 115 km/h for 16.0 min. It then travels at 56.0° south of west at 87.0 km/h for 9.0 min. (a) What is the average speed for the trip? (b) What is the average velocity for the trip in magnitude and direction?

93. ## Physics

A mass m = 1.50 kg oscillates on an ideal,massless horizontal spring with a constant k = 73.5 N/m.The amplitude of oscillation is 10.0 cm.The system is frictionless. The positive x-direction is to the right. What is the mass's natural period of

94. ## Physics

A 12 V battery is connected to 5 mega ohm resistor and a 6 micro farad capacitor and an open switch. After how many seconds will the voltage across the resistor reach 9 V? Suppose the battery is replaced by 12 V ac with a frequency of 60 Hz.Calculate the

95. ## Physics

Force F causes displacement d of a 20-Kg object starting from rest along a frictionless path. F= 10 N i + 50 N j + 15 N k and d= 10 m i + 60 m k A) Calculate the work done by the force. B) Calculate the angle between the vectors F and d. C) Calculate the

96. ## Physics

There is a horizontal rod of length L and mass M. A point mass m is vertically above the rod at a vertical distance L/4 and horizontal distance L/3 from one end of the rod.Using The Riemann sum Integral,find the magnitude and direction of the gravitational

97. ## Physics

In an amusement park rocket ride, cars are suspended from L = 4.28-m cables attached to rotating arms at a distance of d = 6.10 m from the axis of rotation. The cables swing out at an angle of θ = 52.0° when the ride is operating. What is the angular

98. ## physics

Design some simple digital circuits based on Boolean expressions. Draw circuits that implement the following Boolean expressions using some combination of AND, OR, NOT, NAND, and NOR gates. - NOT X OR NOT Y OR Z - X OR Y OR NOT Z - NOT X AND Y OR NOT Y AND

99. ## physics

A container of volume 0.39 m3 contains 8.7 mol of argon gas at 32◦C. Assuming argon behaves as an ideal gas, find the total internal energy of this gas. Answer in units of J.Given: R = 8.31451 J/mol • K.