A Verdant Power water turbine (a "windmill" in water) turns in the East River near New York City. Its propeller is 2.5 m in radius and spins at 32 rpm when in water that is moving at 2.0 m/s. The

45,453 results
  1. physics

    A river flows due east at 1.50 m/s. A boat crosses the river from the south shore to the north shore by maintaining a constant velocity of 9.2 m/s due north relative to the water. (a) What is the velocity of the boat as viewed by an observer on the shore?

  2. Science (Please check my answers)

    1) Which statement correctly identifies the relative levels of kinetic and potential energy in a hydroelectric dam?(1 point) Kinetic and potential energy are both highest at the top. Kinetic energy is highest at the top; potential energy is highest at the

  3. Physic

    A dam is used to block the passage of a river and to generate electricity. Approximately 58.4 x 103 kg of water falls each second through a height of 20.1 m. If one half of the gravitational potential energy of the water were converted to electrical

  4. Physics

    The captain of a boat wants to travel directly across a river that flows due east with a speed of 1.09 m/s. He starts from the south bank of the river and wants to reach the north bank by travelling straight across the river. The boat has a speed of 6.44

  5. physics

    A dam blocks the passage of a river and generates electricity. Approximately 57,000 kg of water fall each second through a height of 19 m. If one half of the gravitational potential energy of the water were converted to electrical energy, how much power

  6. science

    a boat heading due north crosses a wide river with speed of 12km/h relative to the water the water in the river has a uniform speed of 5 km/h due east relative to the earth.determine the velocity of the boat relative to an observer standing on either bank

  7. physics

    A stream of water strikes a stationary turbine blade horizontally, as the drawing illustrates. The incident water stream has a velocity of + 17.4 m/s, while the exiting water stream has a velocity of – 15.0 m/s. The mass of water per second that strikes

  8. i need help with science pls

    ]Most of the drinking water in a location comes from a river. A steel plant is to be built close to the river. It would provide jobs and facilities to many people in the location. The steel plant would use a huge amount of river water. This might cause

  9. Physics

    A river flows toward the East at 1.5 m/s. Steve can swim 2.2 m/s in still water. If he wishes to cross the river so that his direction is northward, what direction relative to the water must he swim?

  10. Physics

    A power station with an efficiency of 0.4 generates 10(to the power of 8)watts of electric power and dissipates 1.5 x 10(to the power of 8) watts of thermal energy to the cooling water that flows through it. Knowing that the specific heat of water in SI

  11. Math

    A boat is heading due north as it crosses a wide river with a velocity of 10km/hr relative to the water.the river has a velocity of 5km due east determine the velocity of the boat with respect on the river bank

  12. Physics

    A ferry is crossing a river.The ferry is headed due north with a speed of 2.5 m/s relative to the water and the river's velocity is 2.0 m/s to the east. What is the magnitude and direction of the ferry's velocity relative to Earth. ( Give the angle from

  13. PHYSICS

    A river is flowing from west to east at a speed of 8m/min, a man on the south bank of the river , capable of swimming at 20m/min in still water, wants to swim across the river in the shortest time. He should swim in a direction of a) due north b) 30 degree

  14. Algebra2

    Wind farms are a source of renewable energy found around the world. The power P (in kilowatts) generated by a wind turbine varies directly as the cube of the wind speed v (in meters per second). If a turbine generates 500kW in a 10m/s wind, how much power

  15. physics

    A ferry is crossing a river. The ferry is headed due north with a speed of 2.4 m/s relative to the water and the river’s velocity is 2.3 m/s to the east. a) What is magnitude of the boat’s velocity b) Find the direction in which the ferry is moving

  16. Science

    1. Which accounts for the highest water withdrawals in the United States? A.mining B. industrial uses C. irrigation D. thermoelectric power 2.Which is the most prevalent source of agricultural water pollution? A. pesticides B. nutrients C. irrigation D.

  17. Physics

    Water drives a waterwheel (or turbine) of radius 3.0m. The water enters at a speed of v1 = 7.0 m/s and leaves at a speed of v2= 3.0 m/s. A) if 150kg of water passes through per second, what is the rate at which the water delivers angular momentum to the

  18. physics

    A ferry is crossing a river. The ferry is headed due north with a speed of 1.1 m/s relative to the water and the river’s velocity is 4.2 m/s to the east.Find the direction in which the ferry is moving (measured from due east, with coun- terclockwise

  19. Physics

    A turbine spinning with angular velocity w_0 rad/sec comes to a halt in T seconds. Find an expression for the angle delta theta through which the turbine turns while stopping.

  20. Need Help Physics

    The captain of a boat wants to travel directly across a river that flows due east with a speed of 1.09 m/s. He starts from the south bank of the river and wants to reach the north bank by travelling straight across the river. The boat has a speed of 6.44

  21. PHYSICS

    A BOAT WHICH HAS A SPEED IS 5 Km/Hr IN STILL WATER CROSSES A RIVER OF WIDTH 1 Km along the shortest possible path in 15 minutes. find velocity of the river water.

  22. physics

    A dam blocks the passage of a river and generates electricity. Approximately 57,000 kg of water fall each second through a height of 19 m. If one half of the gravitational potential energy of the water were converted to electrical energy, how much power

  23. Physics

    A ferry is crossing a river. The ferry is headed due north with a speed of 1.2 m/s relative to the water and the river’s velocity is 3.5 m/s to the east. Find the direction in which the ferry is moving (measured from due east, with counterclockwise

  24. Physics_Vectors

    You can swim at a speed v relative to the water. You are swimming across a river which flows at a speed V relative to the shore. The river is straight and has a constant width. A. If you wish to swim directly across the river, in what direction should you

  25. physics/ math

    Water flows (v approx. 0) over a dam at the rate of 660 kg/s and falls vertically 86 m before striking the turbine blades. Calculate the rate at which mechanical energy is transferred to the turbine blades, assuming 53% efficiency.

  26. Thermodynamics

    A turbine operating under steady flow conditions receives steam at the following state: pressure 13.8 bar, specific volume 0.143 m^3/kg, specific internal energy 2591kJ/kg and velocity 30m/s. The state of steam leaving the turbine is as follows: pressure

  27. physics

    A stream of water strikes a stationary turbine blade horizontally, as the drawing illustrates. The incident water stream has a velocity of + 17.4 m/s, while the exiting water stream has a velocity of – 15.0 m/s. The mass of water per second that strikes

  28. Physics Conservation of energy

    A box is pushed across the floor against a constant frictional force. The box is pushed across the room to the east in 30 seconds and returned to its starting point (pushed to the west) in 60 seconds. Which of the following is true about the work done and

  29. Physics

    A river flows due south with a speed of 2.00 m/s. A man steers a motorboat across the river; his velocity relative to the water is 4.20 m/s due east. The river is 800 m wide. What is the magnitude of his velocity relative to the earth? got it....4.65 m/s

  30. Environmental Science

    True or False: 28. Hydroelectric energy is produced by flowing water turning a turbine which generates electricity. TRUE 32. Geothermal energy is generated when heated water or steam is pumped up from inside the Earth to power a turbine that generates

  31. physics

    Suppose a river flows due south with a speed of 2.0 m/s. Given that speed of motorboat relative to water is 4.2 m/s due east. (a) In what direction should the motorboat head to reach a point on the opposite bank directly east from your starting point? (b)

  32. Science

    Alex threw a stick in a river and watched as the river carried it away. He scooped a pail of water from the river and noticed that a leaf was floating in the pail without moving on the surface of the water. Why did the stick move in the river and the leaf

  33. physics

    the water in a 0.5 km wide river is flowing at 5 m/sec from west to east. a man row a boat with a velocity of 13 m/sec in a direction of north west relative to water. find the time taken to cross the river so that man reaches exactly at same point to

  34. PHYSICS

    JOHN WANTS TO PADDLE HIS CANOE ACROSS A RIVER THAT IS 200M WIDE, HE STARTS FROM THE EAST SIDE. THE WATER CURRENT FLOWS NORTH-SOUTH AT 0.5MS^-1. IT TAKES JOHN 252S TO CROSS THE RIVER. 1. DRAW A DIAGRAM TO GRAPHICALLY REPRESENT THE VELOCTY VECTORS OF THE

  35. physics

    Jack, jill and spot go out for a picnic at the side of the river. jack takes spot for a jog. jack and spot are on the wast bank of the 30m wide river when jill is on the east side. the rivers current is 0.75m/s south. a) spot jumps into the river and swims

  36. English

    1. He is in the river. [For example, half of his body is in the water. Or he is swimming in the river. He may be enjoying scub-diving in the river.] 2. He is on the river. [He is rowing a boat on the river. He is floating down on a log on the river. He may

  37. Earth Science

    Which of the following is not a process that forms metallic ore? placer deposits *** fossil compaction hydrothermal solutions igneous processes 5. Which of the following nonmetallic mineral resources is used both as a building material and as an industrial

  38. PHysics

    An athlete crosses a 21 m wide river by swimming perpendicular to the water current at a speed of 1.1 m/s relative to the water. How fast is the water in the river flowing with respect to the ground in m/s?

  39. Physics

    Suppose at one point along the Nile River a ferryboat must travel straight across a 1.29-mile stretch from west to east. At this location, the river flows from south to north with a speed of 2.58 m/s. The ferryboat has a motor that can move the boat

  40. PHYSICS

    A stream of water strikes a stationary turbine blade horizontally, as the drawing illustrates. The incident water stream has a velocity of +18.0 m/s, while the exiting water stream has a velocity of -18.0 m/s. The mass of water per second that strikes the

  41. Physics

    A stream of water strikes a stationary turbine blade horizontally, as the drawing illustrates. The incident water stream has a velocity of +18.0 m/s, while the exiting water stream has a velocity of -18.0 m/s. The mass of water per second that strikes the

  42. physics

    A stream of water strikes a stationary turbine blade horizontally, as the drawing illustrates. The incident water stream has a velocity of + 17.4 m/s, while the exiting water stream has a velocity of – 15.0 m/s. The mass of water per second that strikes

  43. maths help me

    an engine pumps water from a river 10m an below its own level and discharge it through a nozzle of diameter 10cm with a speed of 50m/ s.find the power required assuming a.no losses b.70% efficiency.water weighs 10^3kgm^-3 {g=10ms^-2} help me

  44. Physics

    A river is flowing 4.0 m/s to the east. A boater on the south shore plans to reach a dock on the north shore 30.0 Degrees downriver by heading directly across the river. What should be the boat's speed relative to the water?

  45. algebra

    Wind farms are a source of renewable energy found around the world. The power P(in kilowatts) generated by a wind turbine varies directly as the cube of the wind speed v(in meters per second) If a turbine generates 700kW in a 5m.s wind, how much power does

  46. ap physics

    A Verdant Power water turbine (a "windmill" in water) turns in the East River near New York City. Its propeller is 2.5 m in radius and spins at 32 rpm when in water that is moving at 2.0 m/s. The rotational inertia of the propeller is approximately 3.0

  47. phyics

    A Verdant Power water turbine (a "windmill" in water) turns in the East River near New York City. Its propeller is 2.5 m in radius and spins at 32 rpm when in water that is moving at 2.0 m/s. The rotational inertia of the propeller is approximately 3.0

  48. physics

    1. You are planning to build a mini hydro power plant. A river near your home is w = 4.0 m wide and h = 1.0 m deep. You measure the water flow to be v = 1.50 m/s over the brink of a waterfall H = 10.0 m high. The company that makes the turbine advertises e

  49. Physics

    Water is falling on turbine at a rate of 6000 kg/min the height of fall is 100 m what is the power given to turbine?

  50. Engineering

    Consider a diesel-fired steam power plant that produces 400 MW of electric power. The turbine inlet conditions of 5 MPa and 500°C and a condenser pressure of 25 kPa. The state of the water at the inlet of the pump is saturated liquid. The steam has

  51. Physic

    Air moving at 13.0 m/s in a steady wind encounters a windmill of diameter 2.30 m and having an efficiency of 29.0%. The energy generated by the windmill is used to pump water from a well 31.0 m deep into a tank 2.30 m above the ground. At what rate in

  52. Physic

    Air moving at 13.0 m/s in a steady wind encounters a windmill of diameter 2.30 m and having an efficiency of 29.0%. The energy generated by the windmill is used to pump water from a well 31.0 m deep into a tank 2.30 m above the ground. At what rate in

  53. physics

    ir moving at 10.0 m/s in a steady wind encounters a windmill of diameter 2.30 m and having an efficiency of 26.5%. The energy generated by the windmill is used to pump water from a well 28.0 m deep into a tank 2.30 m above the ground. At what rate in

  54. Physics - Angular Momentum

    Water drives a waterwheel (or turbine) of radius 3.5 m. The water enters at a speed v_1 = 7.5 m/s and exits from the waterwheel at a speed v_2 = 4.0 m/s. a) If 84 kg of water passes through per second, what is the net torque? b) If the water causes the

  55. Physics

    Hi can someone advise whether my methodology is right on this with a potential energy of 589 kJ per tonne, 100 tonnes of water per second are delivered to a turbine. Assuming all the potential energy of this water is used to drive the turbine how much

  56. Trigonometry

    A water wheel has a radius of 15 ft. A river passing through the water wheel turns the wheel at 11 revolutions per minute(rpm). What is the speed of the river in miles per hour?

  57. Trigonometry

    A water wheel has a radius of 15 ft. A river passing through the water wheel turns the wheel at 11 revolutions per minute(rpm). What is the speed of the river in miles per hour?

  58. physics help please

    You want to use a windmill to generate electricity for your home. You decide to use Earths magnetic field which has a horizontal component B=10^-4 T to an induce emf. You design a conduction loop with 200 turns and surface area of 0.1m^2. The rod is 0.5m

  59. Physics

    #1.) A wind turbine has a Cp of 0.42 and extracts 50 kW of power when the wind velocity is 25 m/sec. How long are the blades? (ρ = 1.2 kg/m3) #2.) An electric hot water heater is used to heat 30 gallons of water from 20 °C to 45 °C. a. What heat energy

  60. science

    Based on the treatment scheme, what type(s) of raw water is / are being treated? Groundwater River water Riverbank filtrate Lake water Infiltrated river water

  61. Water Treatment

    Based on the treatment scheme, what type(s) of raw water is / are being treated? Groundwater River water Riverbank filtrate Lake water Infiltrated river water please post answer

  62. physics

    An open-topped tank completely filled with water has a release valve near its bottom. The valve is 1.63 m below the water surface. Water is released from the valve to power a turbine, which generates electricity. The area of the top of the tank, AT, is a =

  63. physics 20

    Jack, jill and spot go out for a picnic at the side of the river. jack takes spot for a jog. jack and spot are on the wast bank of the 30m wide river when jill is on the east side. the rivers current is 0.75m/s south. a) spot jumps into the river and swims

  64. physics

    An open-topped tank completely filled with water has a release valve near its bottom. The valve is 1.63 m below the water surface. Water is released from the valve to power a turbine, which generates electricity. The area of the top of the tank, AT, is a =

  65. physics

    An open-topped tank completely filled with water has a release valve near its bottom. The valve is h = 1.9 m below the water surface. Water is released from the valve to power a turbine, which generates electricity. The area of the top of the tank, A_T, is

  66. Physics

    A boat moves north at a uniform velocity of 15 mph relative to the shore from one side of the river to a point directly opposite on the other side of the river. The water in the river flows east at a constant speed of 5mph parallel to the shore. What is

  67. Physics

    An open-topped tank completely filled with water has a release valve near its bottom. The valve is 1.75m below the water surface. Water is released from the valve to power a turbine, which generates electricity. The area of the top of the tank, AT, is 11.5

  68. Physics

    A fossil-fuel power plant that generates 1000MW of electrical power discharges 1600MJ per second as waste heat into the river. A)At what rate(in MW) is thermal energy obtained fromt the burning of coal? B)What is the thermal efficiency(power output/heat

  69. Earth Science

    Which of the following is not a process that forms metallic ore? placer deposits *** fossil compaction hydrothermal solutions igneous processes 5. Which of the following nonmetallic mineral resources is used both as a building material and as an industrial

  70. Science asap!

    Which of the following is not a process that forms metallic ore? placer deposits fossil compaction hydrothermal solutions igneous processes 5. Which of the following nonmetallic mineral resources is used both as a building material and as an industrial

  71. Earth Science

    Which of the following is not a process that forms metallic ore? placer deposits *** fossil compaction hydrothermal solutions igneous processes 5. Which of the following nonmetallic mineral resources is used both as a building material and as an industrial

  72. Social Studies

    Mrs. Sue, Please check my answers! Thanks.

  73. Physics-Mechaincs

    A rowboat crosses a river with a velocity of 1.01 m/s at an angle 30◦ North of West relative to the water. Water’s frame of reference: speed of boat: 1.01 m/s direction from current: 30◦ The river is 322mwide and carries a current of 1.63 m/s due

  74. PHYSICS

    a river is flowing west to east at a speed of 5 m/ minutes .in what direction should a man on the south bank of the river capable of swimming of 10 m / minutes in still water should swim to cross the river 1. in short time 2.along short path

  75. math

    A river flows at the speed of v from west to east. How should a man who is at a point A of the southern bank of the river, which is d meters away from the river, and wants to reach a point B on the northern bank of the river, which is 2d meters away from

  76. Math

    A river flows at the speed of v from west to east. How should a man who is at a point A of the southern bank of the river, which is d meters away from the river, and wants to reach a point B on the northern bank of the river, which is 2d meters away from

  77. Math

    A river flows at the speed of v from west to east. How should a man who is at a point A of the southern bank of the river, which is d meters away from the river, and wants to reach a point B on the northern bank of the river, which is 2d meters away from

  78. English

    1. He is in the river. [He is inside the river.] 2. He is sitting on the river. [He is sitting on the surface of the water.] 3. He is sitting in the river. [He is sitting on the bottom of the water.] 4. He is eating at the river. 5. He is eating at the

  79. math

    A man who can swim at 5km/h in still water swims towards the east to cross arriver. If the river flows from north to south at the rate of 3km/h a) Calculate: i) The resultant speed ii) The drift b) If the width of the river is 30m, find the time taken, in

  80. English

    What can we do to save water? 1. We can turn off the water when we are not using it. 2. We can turn off the water when we are brushing teeth. 3. We can use only a little water when we wash face. 4. We can use a little water when we wash hair. 5. We can

  81. physics

    A power station with an efficiency of 0.35 generates 10^8 W of electric power and dissipates 1.86 ✕ 10^8 W of thermal energy to the cooling water that flows through it. Knowing the specific heat of water in SI units is 4184 J/kg°C, calculate how many

  82. phys

    A town is planning on using the water flowing through a river at a rate of 4.9 106 kg/s to carry away the heat from a new power plant. Environmental studies indicate that the temperature of the river should only increase by 0.50° C. The maximum design

  83. physics

    A stream of water strikes a stationary turbine blade horizontally, as the drawing illustrates. The incident water stream has a velocity of +16.0 m/s, while the exiting water stream has a velocity of -16.0 m/s. The mass of water per second that strikes the

  84. physics

    A stream of water strikes a stationary turbine blade horizontally, as the drawing illustrates. The incident water stream has a velocity of + 17.4 m/s, while the exiting water stream has a velocity of – 15.0 m/s. The mass of water per second that strikes

  85. physics

    A town is planning on using the water flowing through a river at a rate of 5.0X10^6 kg/s to carry away the heat from a new power plant. Environmental studies indicate that the temperature of the river should only increase by 0.50ºC. The maximum design

  86. Physics

    A stream of water strikes a stationary turbine blade, as the drawing illustrates. The incident water stream has a velocity of +18.0 m/s, while the exiting water stream has a velocity of -18.0 m/s. The mass of water per second that strikes the blade is 73.0

  87. PHYSICS

    In a power plant the high pressure turbine trips due to an unauthorised valve shutdown. What are a) what is the angular acceleration of the turbine blade? b) what is the distance travelled by a point on the rim of the turbine blade during the acceleration?

  88. PHYSICS

    In a power plant the high pressure turbine trips due to an unauthorised valve shutdown. What are a) what is the angular acceleration of the turbine blade? b) what is the distance travelled by a point on the rim of the turbine blade during the acceleration?

  89. PHYSICS

    In a power plant the high pressure turbine trips due to an unauthorised valve shutdown. What are a) what is the angular acceleration of the turbine blade? b) what is the distance travelled by a point on the rim of the turbine blade during the acceleration?

  90. Earth science

    Can you please correct me if I am wrong or let me know what you think Thanks Y-A 1. Trees keep water in a watershed from accumulating silt before it empties into river. (i got true) 2. Permeable means capable of absorbing water. (i got false) 3. Old rivers

  91. English

    Swimming Strokes by Lee Carroll Paragraph 4: One of the easiest strokes for people who are just learning to swim are the backstroke because the swimmer does not put their faces in the water. Your nose and mouth stay above the water, and they can breathe

  92. Physics

    A river is flowing 4.0 m/s to the east. A boater on the south shore plans to reach a dock on the north shore 30.0 Degrees downriver by heading directly across the river. What should be the boat's speed relative to the water?

  93. Environmental Science

    I'm having diffulculty finding the answer through this passage. Could you please help me out? Industry accounts for 19 percent of water used in the world. Water is used to manufacture goods, to dispose of waste, and to generate power. The amount of water

  94. PHYSICS ---HELP!

    Water flows approx. 0 over a dam at the rate of 660 kg/s and falls vertically 86 m before striking the turbine blades. Calculate the rate at which mechanical energy is transferred to the turbine blades, assuming 53% efficiency.

  95. physics

    Water flows (v approx. 0) over a dam at the rate of 660 kg/s and falls vertically 86 m before striking the turbine blades. Calculate the rate at which mechanical energy is transferred to the turbine blades, assuming 53% efficiency.

  96. Physics

    Water flows approx. 0 over a dam at the rate of 660 kg/s and falls vertically 86 m before striking the turbine blades. Calculate the rate at which mechanical energy is transferred to the turbine blades, assuming 53% efficiency.

  97. physic

    Hi!Question: A river flows due east at 1.70m/s.A boat crosses the river from the south shore to the north shore by maintaining a constant velocity of 8.0m/s due north relative to the water. A.What is the velocity of the boat relative to shore?___m/s and

  98. 3rd grade social studies

    In which part of the USA is Mississippi located: southeast What is the name of the river that forms much of Mississippi western border? Tombidbee River Which state borders Mississippi on the east? Arkansas What large body of water borders Mississippi on

  99. algebra

    Wind farms are a source of renewable energy found around the world. The power P(in kilowatts) generated by a wind turbine varies directly as the cube of the wind speed v(in meters per second) If a turbine generates 500kW in a 10m/s wind, how much power

  100. Physics

    River Dam generates electricity with water taken from a depth of 110 m and with an average flow rate of 740 m3/s. a) Calculate the power in this flow. Note that the velocity and height of the water are not changed appreciably by the generators, and the

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