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September 15, 2014

Homework Help: Science: Physics

Recent Homework Questions About Physics

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Physics
The current in a river is 1.0 meters/second. Britney swims 300 meters against the current. If she normally swims with a speed of 2.0 meters/second in still water, how long does it take her to complete the trip?
Wednesday, June 11, 2014 at 3:33pm

PHYSICS
for given angle of projection if time of flight is doubled horizontal range will increase to A FOUR TIMES B thrice C once D TWICE
Wednesday, June 11, 2014 at 2:22pm

PHYSICS
ratio of average velocity and average and average speed
Wednesday, June 11, 2014 at 2:11pm

physics
A body is to be projected at an angle with a velocity 24m/s just to pass over an obstacle 14m high at adistance of24m.then angle is what.
Wednesday, June 11, 2014 at 1:36pm

Physics
A body is thrown vertically upward with initial velocity 9.8m/s what height it will attain ?
Wednesday, June 11, 2014 at 1:26pm

PHYSICS
ball is dropped from certain height another ball is projected horizontally from the same point . Which statement is correct A BOTH HIT GROUND AT SAME VELOCITY B BOTH HIT GROUND AT SAME SPEED C change of velocity during path for both balls is same D change of SPEED during path ...
Wednesday, June 11, 2014 at 1:17pm

physics
The weightless strut in the figure below is not attached to the wall; it is prevented from falling only by friction. (Let w = 360 N, L = 5.25 m and h = 3.25 m.) (a) Find the magnitude of the force of friction between the wall and the strut. Correct: Your answer is correct. (b...
Wednesday, June 11, 2014 at 12:54pm

PHYSICS
ball is dropped downwards. After 1 sec another ball is dropped from the same point . What is distance between them after 3sec A 25m B 20m C 50m D 9.8m
Wednesday, June 11, 2014 at 12:47pm

physics
if a train at 72kmphr is to be brought to rest in a distance of 200 m then its retardation is A 20m/s^2 b 10m/s^2 c 2m/s^2 d 1m/s^2
Wednesday, June 11, 2014 at 11:27am

physics
a car travels first half distance between two places with average speed of 30 km per hour and remaining half with a speed of 50 km per hour what is the average speed of the car is A 37.5KM/hr B 10km/hr //c// 42km/hr D 40km/hr
Wednesday, June 11, 2014 at 11:08am

Physics
Hi, I need help with another question! A microwave transmitter emits waves towards a metal plate. The waves strike the plate and are reflected back along their path. I really wish I could put the diagram here but I don't think that's possible... The diagram shows 5 ...
Wednesday, June 11, 2014 at 10:41am

Physics
Hi! I need help with this question... A double slit experiment, using light of wavelength 600 nm, results in fringes being produced on a screen. The fringe separation is found to be 1.0 mm. When the distance between the double slits and the viewing screen is increased by 2.0 m...
Wednesday, June 11, 2014 at 10:27am

physics
a 150 metre long train crosses a bridge of length 250 metres in 25 seconds find its velocity
Wednesday, June 11, 2014 at 7:52am

physics
A boy on a motor scooter is traveling at a velocity of 14.1 m/s when he applies his brakes in order to stop. How much time will it take him to stop if he slows down at a rate of 3.2 m/s2?
Wednesday, June 11, 2014 at 7:49am

physics
A motorist is driving at a constant velocity of 28 m/s when he decides to pass a car that is in front of him. He accelerates at a rate of 2.5 m/s2 for 3.0 seconds while passing the car. What is his velocity at the end of the 3.0 seconds?
Wednesday, June 11, 2014 at 7:46am

physics
A motorist is driving at a constant velocity of 28 m/s when he decides to pass a car that is in front of him. He accelerates at a rate of 2.5 m/s2 for 3.0 seconds while passing the car. What is his velocity at the end of the 3.0 seconds?
Wednesday, June 11, 2014 at 7:34am

physics
A student drops an object from a fourth floor window. The velocity of the object is measured at 29.28 m/s 3.0 seconds later. What is the acceleration of the object?
Wednesday, June 11, 2014 at 7:27am

Physics
The Achilles tendon is attached to the rear of the foot as shown in (Figure 1) . A person elevates himself just barely off the floor on the "ball of one foot." Assume the person has a mass of 65kg and D is twice as long as d. Find the tension FT in the Achilles ...
Tuesday, June 10, 2014 at 11:13pm

Physics
What is the maximum tension possible in a 1.15 mm diameter nylon tennis racquet string? The ultimate tensile strength for nylon is 5.00×10^8N/m2.
Tuesday, June 10, 2014 at 11:10pm

Physics
Help please How do the dark lines of an atom's absorption spectrum relate to the bright lines of its emission spectrum? A. The bright lines are at the same energies as the dark lines. B. The dark lines are at higher energies than the bright lines. C. The bright lines are ...
Tuesday, June 10, 2014 at 9:51pm

physics
A flat circular mirror of radius 0.150 m is lying on the floor. Centered directly above the mirror , at a height of 0.750 m, is a small light source. Calculate the diameter of the bright circular spot formed on the 2.90 m high ceiling by the light reflected from the mirror.
Tuesday, June 10, 2014 at 9:13pm

LA
For questions 17–19, refer to the passage below: Albert Einstein, a world-famous mathematician was born in Bavaria in 1879. He acquired Swiss nationality in 1901 and he began working at the Swiss patent office the next year. Einstein was however also publishing papers in ...
Tuesday, June 10, 2014 at 7:58pm

Physics
Determine the acceleration of a 1500 kg automobile that rolls down an incline of 30° from the horizontal if a coefficient of friction between the tires and the incline is 0.12
Tuesday, June 10, 2014 at 6:59pm

Physics
Calculate the tension in the cable connecting the two masses. Assume all surfaces are frictionless.
Tuesday, June 10, 2014 at 6:58pm

Physics
In a rescue scene during the 911 crisis, a helicopter of mass 6000 kg accelerates upwards at the rate of 0.50 m/s2 while lifting a 2500 kg piece of concrete. What is the upward force exerted by the rotors of the helicopter? What is the tension in the cable attaching the ...
Tuesday, June 10, 2014 at 6:58pm

Physics
In the following diagram there is a coefficient of friction, μ, of 0.15 between the 5.0 kg mass and the surface. Calculate the tension in the cable connecting the two masses and the resulting acceleration.
Tuesday, June 10, 2014 at 6:58pm

Physics
A force of 3.0 N and 1.0 N act on a 6.0 kg mass as shown. What is the acceleration of the 6.0 kg mass
Tuesday, June 10, 2014 at 6:57pm

Physics
A 75.0-kg cross-country skier is climbing a 3.0o slope at a constant speed of 2.00 m/s and encounters air resistance of 25.0 N. Find his power output for work done against the gravitational force and air resistance. (b) What average force does he exert backward on the snow to ...
Tuesday, June 10, 2014 at 6:41pm

Physics
(a) How high a hill can a car coast up (engine disengaged) if work done by friction is negligible and its initial speed is 110 km/h? (b) If, in actuality, a 750-kg car with an initial speed of 110 km/h is observed to coast up a hill to a height 22.0 m above its starting point...
Tuesday, June 10, 2014 at 6:27pm

Physics
Am i Correct? 2.0 cm*.044T*/.10 s= 0.88 V Each side of a square loop of wire measures 2.0 cm. A magnetic field of 0.044 T perpendicular to the loop changes to zero in 0.10 s. What average emf is induced in the coil during this change? A. 1.8 V B. 0.088 V C. 0.88 V <-- D. 0....
Tuesday, June 10, 2014 at 5:09pm

Physics
I'm not really sure on this one... Am i correct? A maglev train requires which of the following? A. track and the train must have the different magnetic poles B. track and the train must have the same magnetic poles <--- C. magnetic poles must alternate between the ...
Tuesday, June 10, 2014 at 4:55pm

Physics
Am i correct? My work 0.10/0.20= .5 = 1/2 or is it the other way around? .20/.10? Suppose a magnetic field of 0.20 T is applied to the area within a circular loop of wire. The strength of the field is then changed to 0.10 T. By what factor is the magnetic flux changed? A. 2 B...
Tuesday, June 10, 2014 at 4:38pm

Physics
A spring with a force constant 0f 2.50 kN/M is set upright, and a wood platform of negligible weight is fastened to its upper end. A 2.50 kg mass is gently placed on the platform and released. How far does the spring compress? What is the final equilibrium position?
Tuesday, June 10, 2014 at 3:22pm

physics
(a) How high a hill can a car coast up (engine disengaged) if work done by friction is negligible and its initial speed is 110 km/h? (b) If, in actuality, a 750-kg car with an initial speed of 110 km/h is observed to coast up a hill to a height 22.0 m above its starting point...
Tuesday, June 10, 2014 at 3:21pm

Physics
Show that the x-component of the tension force Fc in terms of its magnitude Fc is given by -0.3420 Fc
Tuesday, June 10, 2014 at 1:42pm

physics!
a 4.0 kg object has a velocity of 4.0 m/s headed east. an explosion causes it to break up into two smaller 2.0 kg objects. if one of the objects has a velocity of 3.0 m/s at an angle of 30 degrees east of north, what is the velocity of the other object after the explosion
Tuesday, June 10, 2014 at 1:16pm

physics
An object of mass 5.0 kg is attached to a string of length 2.0 m and rotating in a horizontal circle with an angular velocity of 3.0 rad/s. What is the angular momentum of the object?
Tuesday, June 10, 2014 at 1:07pm

physics
What is the angular velocity of the object shown below if it rotates about the point P in the center? The rotational kinetic energy of the object is 1.4 J, the mass M is 1.3 kg, and L is 0.50 m.
Tuesday, June 10, 2014 at 12:43pm

Physics
A toy gun uses a spring with a force constant of 300. N/m to propel a 10.0-g steel ball. If the spring is compressed 7.00 cm and friction is negligible: (a) How much force is needed to compress the spring? (b) To what maximum height can the ball be shot? (c) At what angles ...
Tuesday, June 10, 2014 at 12:33pm

Physics
A 75.0-kg cross-country skier is climbing a 3.0o slope at a constant speed of 2.00 m/s and encounters air resistance of 25.0 N. Find his power output for work done against the gravitational force and air resistance. (b) What average force does he exert backward on the snow to ...
Tuesday, June 10, 2014 at 12:33pm

Physics
. (a) How high a hill can a car coast up (engine disengaged) if work done by friction is negligible and its initial speed is 110 km/h? (b) If, in actuality, a 750-kg car with an initial speed of 110 km/h is observed to coast up a hill to a height 22.0 m above its starting ...
Tuesday, June 10, 2014 at 12:33pm

Physics
A spring with a force constant 0f 2.50 kN/M is set upright, and a wood platform of negligible weight is fastened to its upper end. A 2.50 kg mass is gently placed on the platform and released. How far does the spring compress? What is the final equilibrium position?
Tuesday, June 10, 2014 at 12:32pm

physics
A man is playing tennis and a tennis ball (m=1.2 kg) approaches his tennis racket with a speed of 8.0 m/s. His racket is in contact with the ball for 2.0 ms and sends the ball flying in the opposite direction with a speed of 6.0 m/s. What is the magnitude of the average force ...
Tuesday, June 10, 2014 at 12:29pm

physics
a vehicle is accelerating on a straight road. Its velocity at any instant is 30 km/hr, after 2 s, it is 33.6 km/hr and after further 2 s, it is 37.2 km/hr. Find the acceleration of vehicle in m/s^2
Tuesday, June 10, 2014 at 10:43am

physics
You have a box that contains 200 marbles. 99% of the marbles are green, the other 1% are white. How many green marbles would you have to remove from the box to reduce the percentage of green marbles to 98%?
Tuesday, June 10, 2014 at 10:26am

physics
A man in a circus shows jumps from a of 10m and is caught by the safety net which sags 2m due to his weight.calculate the average force exerted by the net on the man to stop his fall if the mass of the man is 60kg
Tuesday, June 10, 2014 at 6:49am

physics
A driver of a car travelling along a straight road with a speed of 72k.m./hour . Observes a sign board which gives the speed limit 54k.m./h.the signboard is 70m ahead when the driver applies break . Calculate the acceleration the car which will cause the car to pass the ...
Tuesday, June 10, 2014 at 2:55am

Physics
The air pressure on Pikes Peak in Colorado is approximately 600 millibars. What is the relationship between air pressure at the top of Pikes Peak and at sea level, where air pressure is 1013 millibars?
Tuesday, June 10, 2014 at 1:25am

physics
A skateboarder, with an initial speed of 4.2m/s , rolls virtually friction free down a straight incline of length 16m in 3.3 s.
Tuesday, June 10, 2014 at 12:42am

physics
A 370kg piano slides 2.9m down a 24∘ incline and is kept from accelerating by a man who is pushing back on it parallel to the incline. Ignore friction.
Monday, June 9, 2014 at 7:25pm

physics
The elastic potential energy of an object may be negative Select one: True False
Monday, June 9, 2014 at 5:28pm

physics
You shoot a 57 gram dart vertically upwards from a catapult with a spring constant of 379 N/m. The catapult is initially stretched from the equilibrium point by 30 cm. What is the height above the starting point reached by the dart? Ignore air resistance and give your answer ...
Monday, June 9, 2014 at 5:28pm

physics
An object of mass 1.6 kg is dropped from a height of 2.9 metres. It lands with a speed of 2.8 m/s. How much energy was lost due to air resistance? (Give your answer to 2 s.f., expressed as a magnitude)
Monday, June 9, 2014 at 5:25pm

physics
Calculate the magnitude of the force if a ball of mass 249.9 grams, and initial velocity +16.5 m/s is struck back on the same path with a final velocity of -22.0 m/s. Assume the contact time is 3.1 milliseconds. Use 2 s.f.
Monday, June 9, 2014 at 5:24pm

physics
An astronaut, mass 128.2 kg including spacesuit, pushes off from the International Space Station (mass 110 tons) with a speed of 1.2 m/s. What is the speed of the Space station in the opposite direction? Use 2 s f. for your answer
Monday, June 9, 2014 at 5:24pm

Physics
. A weightlifter lifts a 76.0 kg barbell 2.60 m 20 times in 1.50 minutes. What is his power output (a) in watts and (b) in hp?
Monday, June 9, 2014 at 3:26pm

Physics
Calculate the maximum acceleration of a car that is heading up a 9.5° slope, assume that only half the weight of the car is supported by the two drive wheels and that the static coefficient of friction is 1.
Monday, June 9, 2014 at 2:28pm

Physics
with this one i'm confused i'm not sure if it's b or d The current in a solenoid is changed from 1.1 A to 4.4 A. By what factor does the magnitude of the magnetic field inside the solenoid increase? 2 4 0.5 0.25 1.1/4.4= 0.25 0r 4.4/1.1= 4
Monday, June 9, 2014 at 12:57pm

Physics
Help please A wire carries a current of 5.2 A from east to west through a 6.0 m section of wire in the earth's magnetic field of 1 × 10^-5 T at a location where the magnetic field points south. What is the magnitude of the magnetic force acting on the wire? 3.1 &...
Monday, June 9, 2014 at 12:41pm

Physics
In a model yacht race on a river five identical yachts A,B,C,D,E are released at the same time from different points along the starting line. a)why should C win? b) as they approach the finishing line they all slow down. Why?
Monday, June 9, 2014 at 8:35am

PHYSICS
relation between time "t" and distance "x' is t=ax^2+bx where a and b are constant then acceleration is A / -2abv^2 b/ 2bv^3 C // -2av^3 D // 2av^2
Monday, June 9, 2014 at 5:13am

physics
Water is flowing through a horizontal pipe of varying cross section. At section 1,the diameter is 12cm at a pressure of 80000 Pa. At section 2, the pipe has a diameter of 6cm and the pressure is 60000 Pa. Find the speed of water through sections 1 and 2.
Monday, June 9, 2014 at 4:15am

physics
In a spray can,the flow of air makes paint flow up the tube. As the air flows, it is blown away in droplets. A)as the air flows what happens to its speed and pressure? Why? B)why does the paint flow up the tube?
Monday, June 9, 2014 at 4:07am

physics
In a model yacht race on a river five identical yachts A,B,C,D,E are released at the same time from different points along the starting line. a)why should C win? b) as they approach the finishing line they all slow down. Why?
Monday, June 9, 2014 at 4:01am

physics
A child drops a ball from a height of 10 m. Assume its acceleration increases uniformly at the rate of 10m/s2. find the velocity with which the ball strikes the ground. Find the time taken to the ball reach the ground.
Monday, June 9, 2014 at 3:19am

physics
The mass of an atom can be determined by ionizing it and accelerating it through a known electric field followed by a known magnetic field. The ion’s circular path is then measured. Calculate the mass of a chlorine anion of charge 3.20 × 10−19 C if it follows ...
Monday, June 9, 2014 at 3:19am

physics
Two straight and parallel wires of length 1.0 m carry a current — the first carries a current of 9.0 A while the other wire carries a current of 4.0 A. What distance must separate the two straight and parallel copper wires if the force between them is to be 6.0 × 10...
Monday, June 9, 2014 at 3:17am

physics
A child drops a ball from a height of 10 m. Assume its acceleration increases uniformly at the rate of 10m/s2. find the velocity with which the ball strikes the ground. Find the time taken to the ball reach the ground.
Monday, June 9, 2014 at 3:16am

physics
Two straight conductors are 15 cm apart. If one conductor has a current of 12 A and the other has a current of 18 A, calculate the magnetic field at a point midway between the two conductors. The current in both conductors is flowing in the same direction.
Monday, June 9, 2014 at 2:47am

physics
2.00 m long straight copper wire has a current of 8.0 A in it as it passes through a magnetic field. The magnitude of the force on the conductor is 2.00 N. The angle between the current and the magnetic field is 45°. What is the magnitude of the uniform magnetic field?
Monday, June 9, 2014 at 2:38am

physics
a wire of resistance 5omega is bent in the form of a closed circle . what is the effective resistance between the two points at ends of any diameter of the circle?
Monday, June 9, 2014 at 1:57am

physics
The human body can survive an acceleration trauma incident (sudden stop) if the magnitude of the acceleration is less than 250 m/s2. If you are in an automobile accident with an initial speed of 136 km/h (85 mi/h) and you are stopped by an airbag that inflates from the ...
Sunday, June 8, 2014 at 11:12pm

physics
he drawing shows a steel ball rolling along a flat surface at constant velocity from point A to point B. A magnet exerts an attractive force on the ball only for the short time that passes as the ball rolls past point B. Which one of the following trajectories does the ball ...
Sunday, June 8, 2014 at 9:35pm

physics
Two satellites are orbiting the Earth in stable circular orbits. Satellite A has a mass m and is located at a distance 2r from the center of the Earth. Satellite B has a mass 2m and is located at a distance r from the center of the Earth. Which one of the following statements ...
Sunday, June 8, 2014 at 9:35pm

physics
A box containing supplies is vertically lowered at constant speed by a rope from a hovering helicopter. Consider the following forces that arise in this situation: force 1: the force of the earth pulling on the box force 2: the tension force acting on the box force 3: the ...
Sunday, June 8, 2014 at 9:14pm

physics
The drawing shows a steel ball rolling along a flat surface at constant velocity from point A to point B. A magnet exerts an attractive force on the ball only for the short time that passes as the ball rolls past point B. Which one of the following trajectories does the ball ...
Sunday, June 8, 2014 at 9:13pm

Physics
A model airplane is flying in a horizontal circle with a constant speed. The initial radius of the circle is R. The boy holding the cord to which the airplane is attached, then decides to increase the length of the cord so that the radius of the circle increases to 2R. The ...
Sunday, June 8, 2014 at 9:05pm

physics
acceleration = 2,84 m.s Tension = 5,18 N
Sunday, June 8, 2014 at 5:54pm

physics
The two blocks in the sketch are connected by a light cord over a frictionless pulley and are initially held in place. The block m1 has a mass of 2,00 kg and m2 has a mass of 3,00 kg. The inclined plane is frictionless and the coefficient of kinetic friction between block m1 ...
Sunday, June 8, 2014 at 5:39pm

Physics
Please Help! I am having difficulties grasping these concepts. Explain please! 1. How much heat energy is required to change 500 grams of water at 100 degrees Celsius to steam at 100 degrees Celsius? 2. How much energy is lost if 7kg of water is cooled from 46 degrees Celsius ...
Sunday, June 8, 2014 at 4:50pm

Physics
Two masses are connected by a string over an ideal pulley as shown. The coefficient of kinetic friction between m1 and the table surface is 𝜇. Find an expression for their common speed after the blocks have moved a distance L. You can assume that you know: m1, m2, L, ...
Sunday, June 8, 2014 at 4:25pm

physics
A pendulum is suspended inside a car vertically suddenly the car is given a horizontal acceleration 'a'.The maximm angle through which the pendulum deflects is ?answer is 2tan inverse 'a'divided by g(acceleration due to gravity please solve this i have given ...
Sunday, June 8, 2014 at 4:23pm

Physics
A 4.5kg box slides down a 4.1-m -high frictionless hill, starting from rest, across a 1.7-m -wide horizontal surface, then hits a horizontal spring with spring constant 490N/m . The other end of the spring is anchored against a wall. The ground under the spring is frictionless...
Sunday, June 8, 2014 at 4:21pm

Physics
A horizontal spring with spring constant 110N/m is compressed 16cm and used to launch a 2.8kg box across a frictionless, horizontal surface. After the box travels some distance, the surface becomes rough. The coefficient of kinetic friction of the box on the surface is 0.15. ...
Sunday, June 8, 2014 at 4:20pm

Physics
A system gains 473J of kinetic energy while losing 271J of potential energy. The thermal energy increases by 127J . Use an energy bar chart of this process to find the external work Wext.
Sunday, June 8, 2014 at 4:18pm

Physics
Futurists project large space stations which would rotate so as to use centripetal acceleration to simulate gravity. The outer wall of the rotating space station would become a floor for the astronauts, and centripetal acceleration supplied by the floor would allow astronauts ...
Sunday, June 8, 2014 at 4:14pm

Physics
Astrology, that unlikely and vague pseudoscience, makes much of the position of the planets at the moment of one’s birth. The only known force a planet exerts on objects on Earth is gravitational. (a) Calculate the gravitational force exerted on a 4.20 kg baby by the ...
Sunday, June 8, 2014 at 4:14pm

physics
A geosynchronous Earth satellite is one that has an orbital period equal to the rotational period of the Earth. Such orbits are useful for communication and weather observation because the satellite remains above the same point on Earth, provided it orbits in the equatorial ...
Sunday, June 8, 2014 at 4:13pm

physics
A body of mass 'M' starts sliding down on the inclined plane where the critical angle is 30 the coefficient of kinetic friction will be ?answer is square root 3 but how?i am not getting please help.
Sunday, June 8, 2014 at 4:11pm

Physics 20
1. How much heat energy is required to change 500 grams of water at 100 degrees Celsius to steam at 100 degrees Celsius? 2. How much energy is lost if 7kg of water is cooled from 46 degrees Celsius to 2 degrees Celsius? 3. How much energy is gained when a 300g piece of ice at...
Sunday, June 8, 2014 at 4:06pm

Physics-can someone please check this
John is fired horizontally from a cannon with the speed of 24.5 m/s. In 3.0 seconds he strikes the earth down range. A net will be located on the ground to catch him. a) what is his initial position above the ground? b) What is the horizontal range to put the net? a)+ upward ...
Sunday, June 8, 2014 at 3:30pm

Physics
A model airplane is flying in a horizontal circle with a constant speed. The initial radius of the circle is R. The boy holding the cord to which the airplane is attached, then decides to increase the length of the cord so that the radius of the circle increases to 2R. The ...
Sunday, June 8, 2014 at 2:56pm

Physics
an 80kg man jumps off a 60m cliff, halfway to the ground, his GPE is 27,072J. What is his KE at the same moment?
Sunday, June 8, 2014 at 2:31pm

Physics
A 1 kg mass is hung at the 0 mark of a meter stick and a 3 kg mass is hung at the 100 cm mark of the same meter stick. If the mass of the meter stick is 0.2 kg, at which of the following points of the meter stick could you balance the system on one finger? Select one: a. 38.9 ...
Sunday, June 8, 2014 at 2:14pm

physics
A block of mass m = 0.605 kg is fastened to an unstrained horizontal spring whose spring constant is k = 67.5 N/m. The block is given a displacement of +0.120 m, where the + sign indicates that the displacement is along the +x axis, and then released from rest. (a) What is the...
Sunday, June 8, 2014 at 1:38pm

physics
You are traveling in a convertible with the top down. The car is moving at a constant velocity of 16.6 m/s, due east along flat ground. You throw a tomato straight upward at a speed of 9.85 m/s. How far has the car moved when you get a chance to catch the tomato?
Sunday, June 8, 2014 at 12:45pm

Physics
. A rock is thrown up into the air with an initial velocity of 15m/s up. What is the rock's velocity after 0.40 seconds?
Sunday, June 8, 2014 at 12:04pm

physics
a homeowner wishes to drain her swimming pool by siphoning the water, whose depth is h, into a nearby gully a distance H below it,where H is much larger than h.she uses pipe of cross-sectional area a, and the pool has surface area A.how long does it take to empty the pool if h...
Sunday, June 8, 2014 at 11:00am

Chemistry/physics
The KE of a hydrogen atom's electron is 12.65 eV. Calculate the velocity of the electron? Known: KE=mv^2
Sunday, June 8, 2014 at 10:20am

Physics
A block takes 3 times as long to slide down an inclined plane that makes an angle of 30 degrees as it does to fall freely through the same vertical distance. Determine the coefficient of friction? I have no idea where to start on this. :(
Sunday, June 8, 2014 at 10:19am

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