Monday
August 29, 2016

Homework Help: Science: Physics

Recent Homework Questions About Physics

Physics
The first meters of a 100-meter dash are covered in 2 seconds by a sprinter who starts from rest and accelerates with a constant acceleration. The remaining 90 meters are run with the same velocity the sprinter had after 2 seconds. a. Determine the sprinter's constant ...
Monday, August 29, 2016 by Allyson

PHYSICS
Runner A is initially 5.3 km west of a flagpole and is running with a constant velocity of 8.1 km/h due east. Runner B is initially 4.7 km east of the flagpole and is running with a constant velocity of 7.8 km/h due west. How far are the runners from the flagpole when their ...
Monday, August 29, 2016 by tyler

physics
Runner A is initially 5.3 km west of a flagpole and is running with a constant velocity of 8.1 km/h due east. Runner B is initially 4.7 km east of the flagpole and is running with a constant velocity of 7.8 km/h due west. How far are the runners from the flagpole when their ...
Monday, August 29, 2016 by sofia

Physics
At which point or points is the electric field zero in figure? I can not post the picture, but this is what it looks like: 1 2 3 4(4+)5 6(-)7 8 9 10 The (4+) is a proton with 4 charges. The (-) is an electron with 1 charge. They are on a number line 1-10. The proton is between...
Monday, August 29, 2016 by Brittany

physics
Find the density of the earth if its mass is 6×10^3kg and radius is 6.4×10^3km
Monday, August 29, 2016 by cadaawe

physics
A 1000-kg airplane moves in straight flight at constant speed. The force of air friction is 1800 N. The net force on the plane is ?
Monday, August 29, 2016 by Mahmoud

physics
A wire of nichrome of length 80cm has a resistance of 50 ohms. if the wire is four folded, find new resistance.
Monday, August 29, 2016 by vanditha

Physics
A car, in overtaking trailer, uniformly accelerated its speed from 40 kph to 90 kph in 8 seconds. Calculate the distance traveled during the period of acceleration.
Monday, August 29, 2016 by Unknown

Physics
Hi everybody! I need this quick answer, please help! The beam AB in the figure has length 3L and uniform section stiffness EI. The beam is fixed at A(x=0) and loaded by an upward concentrated force, P, applied at its free end B(x=3L). A concentrated moment Q is also applied, ...
Sunday, August 28, 2016 by carolina02

Bio physics chemistry pre medical
Methane react with steam to form h2 and co. . what volume of h2 can be obtained from 100cmcube of methane at the standard temperature and pressure? ?
Sunday, August 28, 2016 by Hania

Bio physics chemistry pre medical
The vitamin a has a molecular formula c 20 h 30 o. How much no of molecules will be vitamin a has in 500mg capsule?
Sunday, August 28, 2016 by Anonymous

Bio physics chemistry pre medical
Vitamin a has a molecular formula c 20 h 30 o. How much no of molecules will vitamin a contian in 500mg capsule? ? Plz tell me now tomorrow is my test .I will be very grateful of u. .
Sunday, August 28, 2016 by Hania

physics
a ball projected vertically upwards from the top of the tower 60 meters high with a velocity of 30 meters per second. what is the maximum height above the ground? how long does it take to reach the ground?
Sunday, August 28, 2016 by richard

Physics
Initial Statement: A soccer ball is kicked with an initial horizontal velocity of 15 m/s and an initial vertical velocity of 14 m/s. 1) What is the initial speed of the ball? 20.518 2) What is the initial angle θθ of the ball with respect to the ground? 43.025 3) ...
Sunday, August 28, 2016 by Aidan

physics
Simpson drives his car with an average velocity of 48.0 km/ to the east. How long will it take him to drive 144 km on a straight highway?
Sunday, August 28, 2016 by monet

Physics
Michael flies in an airplane due north to Michigan. The pilot encounters a direct crosswind from the west of 120 mph. What direction must the pilot steer in order to end up with a resultant of due north and average velocity of 120 mph? Measure and calculate the speed of the ...
Sunday, August 28, 2016 by Jennifer

Honors Physics
How do you determine the mass of fuel in a semi truck?
Sunday, August 28, 2016 by Leona

Physics
The driver of a sport car pushed down the accelerator so that the engine pushes the care forward with a force of 2500N,s tarting from rest. How fast the car can go after 20s later? I have tried this by using v=u+at but i dont have a. From F=ma, i cant get the value of a since ...
Sunday, August 28, 2016 by Tan

Bio physics chemistry pre medical
Vitamin a has a molecular formula c 20 h 30 o. How much no of molecules will vitamin a contian in 500mg capsule? ? Plz tell me now tomorrow is my test .I will be very grateful of u. .
Sunday, August 28, 2016 by Hania

Bio physics chemistry pre medical
Methane react with steam to form h2 and co. . what volume of h2 can be obtained from 100cmcube of methane at the standard temperature and pressure? ?
Sunday, August 28, 2016 by Hania

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 WATER CANOE AND THEIR ...
Sunday, August 28, 2016 by SARAH

physics
A 5-kg block lies on a smooth table top. A horizontal string connected to the block is passed over a small pulley at the edge of the table, and a body of mass 8 kg is hung from the other end of the string. Find the tension in the string and the acceleration of the bodies when ...
Sunday, August 28, 2016 by Rhian

physics
A bus is moving at a speed of 20m/s beyond to slow at a constant rate of 3m/s each second find how far it goes before stopping
Sunday, August 28, 2016 by charan

physics
Rocket-powered sleds are been used to test the responses of humans to acceleration. Starting from rest, one sled can reach a speed of 495 m/s in 1.78 s and can be brought to a stop again in 2.16 s. Find the acceleration of the sled while ac- celerating. Answer in units of m/s2...
Saturday, August 27, 2016 by kailee

physics
a 50 kg crate is at rest on a level surface the coefficients of friction are 0.3 and 0.4,what is the normal force acting on the crate, a man begins pushing horizontally on the crate how much force must the man exert to start the crate moving, how much force must the man exert ...
Saturday, August 27, 2016 by bryan

physics
a slingshot launches a rock straight upward at 25 m/s, how high does the rock go, how long is it in the air, what is the velocity and the acceleration of the rock at its highest point
Saturday, August 27, 2016 by scott

physics
a greyhound is capable of running at 40 mph, how many meters could the greyhound run in 3 minutes at this speed, how many seconds would it take the greyhound to run 1 km at this speed
Saturday, August 27, 2016 by scott

Physics. Pleaseee helpppp
Four electrons are located at the corners of a square 10.0nm on a side, with an alpha particle at its midpoint. How much work is needed to move the alpha particle to the midpoint of one of the sides of the square?
Saturday, August 27, 2016 by Nanny

Physics
A piece of wood of mass 60kg and density 600kg/m3 flows in water of density of 1000kg/m3.calculate (a) volume of water that the wood displaced (b) the fraction of volume of mass and water
Saturday, August 27, 2016 by Pauliho

physics
what change in velocity would be produced on a body of mass 4kg, if a contact force of 16N act on it for 2sec.
Saturday, August 27, 2016 by sanusi

Physics
A pebble is dropped from rest from the top of a tall cliff and falls 4.9meters after 1 second has elapsed. How much further does it drop in the next 2 seconds?
Friday, August 26, 2016 by Hiba

Physics
A heavy rainstorm dumps 1.0 cm of rain on a city 8 km wide and 9 km long in a 2 hour period. How many metric tons (1 metric ton = 10^3 kg) of water fell on the city? (1 cm^3 of water has a mass of 1g = 10^-3 kg) What I have thus far: 72 km^2 x (1E^10 cm^2/1km^2) x (10^-3 kg/ ...
Friday, August 26, 2016 by Anonymous

Physics
How many metric tons (1 metric ton = 10^3 kg) of H2O fell on a city? (1cm^3 of H2O has a mass of 1g = 10^-3 kg) Thus far I have: 10^-3 Kg x (1 metric ton/10^3) but I don't understand the significance of adding 1 cm^3 to the problem.
Friday, August 26, 2016 by Kaitlin

12th grade physics
A boat pulled through a canal by horses walking parallel to the canal and exerting a force of 1000 N on a tow Rope 40 meters long. Is the distance from the boat to the horse track is 15 meters, what is the magnitude of the effective component pulling the boat forward
Friday, August 26, 2016 by Daryione

physics
round of the following digits- 3.65*105(upto are place of decimal) 0.882026(upto three significant figures) 311.299(upto four significant figures) 4.783(upto two significant figures)
Friday, August 26, 2016 by yashaswi

Physics
A water tank has a mass of 3.65 kg when empty and has a mass of 52.5 kg when filled to a certain level. What is the mass of water in the tank?
Friday, August 26, 2016 by Faith

physics
a ball is vertically upward with a velocity of 35m/s. how long will the ball reaches the ground?
Friday, August 26, 2016 by jerson

Physics
In a novel from 1866 the author describes a spaceship that is blasted out of a cannon with a speed of about 11.000 m/s. The spaceship is approximately 274 m long but part of it is packed with gunpowder, so it accelerates over a distance of only 213 m. What was the acceleration...
Friday, August 26, 2016 by Geoff

Physics
A racquet ball is struck in such a way that it leaves the racquet with a speed of 4.8 m/s in the horizontal direction. When the ball hits the court, it is a horizontal distance of 1.94 m from the racquet. Find the height of the racquet ball when it left the racquet. I need ...
Friday, August 26, 2016 by Geoff

Physics I - Modern
An electron with a speed of 0.988c is emitted by a supernova, where c is the speed of light. What is the magnitude of the momentum of this electron? Thanks for any help you can offer! I've tried so many things!
Thursday, August 25, 2016 by Victoria

physics
a greyhound is capable of running at 40 mph how many meters could the greyhound run in 3 minutes at this speed, how many seconds how many seconds would it take the greyhound to run 1 km at this speed
Thursday, August 25, 2016 by bryan

physics
A rock is thrown straight up with an initial velocity of 15m/s. ignore the effect of air resistance , how high will the rock rise ?
Thursday, August 25, 2016 by Mahmoud

Physics
Space explorers discover an 8.7×10^17kg asteroid that happens to have a positive charge of 4400 C. They would like to place their 3.3×10^5kg spaceship in orbit around the asteroid. Interestingly, the solar wind has given their spaceship a charge of -1.2C. What ...
Thursday, August 25, 2016 by Brittany

physics
A ball is thrown upward into the air with a speed of 15m/s. At what times does the ball pass a point 8 meters above the person's hand? 8m=-0.5(9.8)(t) t=1.8 seconds Is that correct?
Thursday, August 25, 2016 by Chelsea Woodard

Physics
An electric motor runs at a constant rotational frequency of 3000 r/min and has the load of 75 Nm and a 5,0 Nm extra load of friction and gear. The efficiency of the motor is 78%. a) What is the input power of the motor? b) What is the work done by the motor in 24 hours and c...
Thursday, August 25, 2016 by Anonymous

physics
A train moving with speed 72 km h−1 emits a whistle of frequency 600 Hz. A person is standing stationary on the platform. Calculate the frequency heard by the person if the train (i) approaches and (ii) recedes away from the listener.
Thursday, August 25, 2016 by bharat

Physics
Power of a car weighing 1200kg is 134.05hp and its efficiency is 90%. How long will it take to raise of the car to 20m/s from rest. solution:v2=u2+2as 400=2as as=200 real power=13.05hp =100001.3W effective power=90001.17W Power=W/t =mas/t =1200*200/t t=90001.17/240000 =2.67s ...
Thursday, August 25, 2016 by RBAS

physics
A plane flies from base camp to Lake A, 260 km away in the direction 20.0° north of east. After dropping off supplies it flies to Lake B, which is 150 km at 30.0° west of north from Lake A. Graphically determine the distance and direction from Lake B to the base camp. ...
Wednesday, August 24, 2016 by john

physics vectors
While exploring a cave, a spelunker starts at the entrance and moves the following distances. She goes 75.0 m north, 250 m east, 109 m at an angle θ = 30.0° north of east, and 156 m south. Find the resultant displacement from the cave entrance. The figure below ...
Wednesday, August 24, 2016 by john

physics vectors
A plane flies from base camp to Lake A, 260 km away in the direction 20.0° north of east. After dropping off supplies it flies to Lake B, which is 150 km at 30.0° west of north from Lake A. Graphically determine the distance and direction from Lake B to the base camp. ...
Wednesday, August 24, 2016 by john

PHYSICS
A bucket containing cement has a mass of 3kg. One end of a rope is attached to the handle of the bucket and the other end is wound around a horizontally mounted cylinder on frictionless bearings. The mass of cylinder is 6kg and its radius is 0.10m. The moment of inertia of the...
Wednesday, August 24, 2016 by Sarah

physics vectors
In the figure below, a spider is resting after starting to spin its web. The gravitational force on the spider is 0.158 N on the junction of the three strands of silk. The junction is supported by different tension forces in the two strands above it so that the resultant force...
Wednesday, August 24, 2016 by john

PHYSICS
A BALL MOVES ROUND A CIRCLE WITH RADIUS OF 20CM CALCULATE THE DISTANCE
Wednesday, August 24, 2016 by ORJINTA

physics vectors
If vector A = (6.00 i -8.00 j) units, vector B = (-8.00 i + 3.00 j) units, and vector C = (25.0 i + 22.0 j) units, determine a and b such that (a vector A + b vector B + vector C= 0.) a=? b=?
Wednesday, August 24, 2016 by john

Physics
Starting from rest, a 2500 kg helicopter accelerates straight up at a constant 1.7 m/s2. What is the helicopter's height at the moment its blades are providing an upward force of 29 kN? The helicopter can be modeled as a 2.6-m-diameter sphere. How do you start this ...
Wednesday, August 24, 2016 by Brittany

Physics
please help me 1)In the movie The avengers, Captain America sees an alien speeder incoming. The speeder passes directly overhead at 3.65m. If he throws his shield straight up with a speed of 7.40 m/s from a height of 1.55 m above the ground (a) will the shied reach the speeder...
Wednesday, August 24, 2016 by Kevin

physics
A 500 car travelling at 45 km/hr towards west collides w/a 20000 kg truck travelling at 30 km/hr, 30 degrees south of west. if the two vehicle remain tangled together after collision, in what speed and in direction will they move?
Wednesday, August 24, 2016 by Iker

physics
A block of wood is 8.00cm long, 20.0cm high, and 0.10m wide. its mass is 1.00kg. what is its density in g/cm3?
Wednesday, August 24, 2016 by Anonymous

physics
A vertical container with base area measuring 12.3 cm by 13.7 cm is being filled with identical pieces of candy, each with a volume of 50.0 mm^3 and a mass of 0.0200 g. Assume that the volume of the empty spaces between the candies is negligible. If the height of the candies ...
Wednesday, August 24, 2016 by jacob

Physics
When observing a stem of coconut trees during sunshine,how the light cannot pass through the leaves of the coconut tree even though it is thin and it form shadow, whereas the stem allows the light to pass through them but their stem is thick and how possible this could be??
Wednesday, August 24, 2016 by Emitai Maiwelagi

Physics
Totally confused on this question, Please help. 1)In the movie The avengers, Captain America sees an alien speeder incoming. The speeder passes directly overhead at 3.65m. If he throws his shield straight up with a speed of 7.40 m/s from a height of 1.55 m above the ground (a...
Wednesday, August 24, 2016 by Kevin

physics vectors
A snow-covered ski slope makes an angle of θslope = 34.0° with the horizontal. When a ski jumper plummets onto the hill, a parcel of splashed snow is thrown up to a maximum displacement of 1.10 m at θsnow = 24.0° from the vertical in the uphill direction as ...
Tuesday, August 23, 2016 by john

physics vectors
Consider the two vectors A with arrow = 3 i − j and B with arrow = − i − 6 j. Calculate the directions of A with arrow + B with arrow and A with arrow − B with arrow. A with arrow + B with arrow ° (counterclockwise from the +x axis) A with arrow &#...
Tuesday, August 23, 2016 by john

physics
A plane flies from base camp to Lake A, 260 km away in the direction 20.0° north of east. After dropping off supplies it flies to Lake B, which is 150 km at 30.0° west of north from Lake A. Graphically determine the distance and direction from Lake B to the base camp. ...
Tuesday, August 23, 2016 by john

physics
Two trains 200m and 300m are running towards each other at 50km/hr and 40km/hr respectively and the distance between the two trains is 12km. In how many minutes will the two trains cross each other.?
Tuesday, August 23, 2016 by Abul Qasim

Physics
A ball thrown vertically upwards is caught by the thrower 8 seconds afterwards . (take g =10) When the ball is caught by the thrower: what is its displacement from the initial position? b) what is the initial velocity? c) To what height does the ball rise? d) With regard to (c...
Tuesday, August 23, 2016 by Wawen

physics
There are 6 resistor of resistance 1ohm
Tuesday, August 23, 2016 by pratyush

Physics
Find another velocity when horizontal range is equal and one velocity is 500m/s and angle is 30degrees
Tuesday, August 23, 2016 by Brijtosh

physics
if your weight is 300 N what is the upthrust on you when you are floating in water
Tuesday, August 23, 2016 by meenakshi

physics
the upthrust on a boat is 1000 N what is the weight of the boat
Tuesday, August 23, 2016 by meenakshi

physics
If your weight is 300 N what is the upthrust on you when you are floating in water
Tuesday, August 23, 2016 by meenakshi

physics
if the weight of the stone was 2 N and the upthrust was 1 N what weight would the force meter show?
Tuesday, August 23, 2016 by meenakshi

Urgent help! Physics
A ball is kicked into the air with a speed of 10m per second at angle of 60 degrees to the horizontal (take g=10). a) Calculate the horizontal and vertical speed of the ball b) Calculate the ball's time of flight c) Calculate the distance from the kicked point that the ...
Tuesday, August 23, 2016 by Papsi

physics
A uniform wooden plank 68cm long and weighing 38N rest horizontaly on two knife edges each 10cm from the ends of the plank. (1) What is the greatest land which applied at one end of the plank will not cause it to over turn. (2) what are the reactions of the support cohese a ...
Tuesday, August 23, 2016 by Asare Joseph

physics
A uniform wooden plank 68cm long and weighing 38N rest horizontaly on two knife edges each 10cm from the ends of the plank. (1) What is the greatest land which applied at one end of the plank will not cause it to over turn. (2) what are the reactions of the support cohese a ...
Tuesday, August 23, 2016 by Asare

physics
A 1-kg mass hangs by a string from a disk with radius 4.6 cm which has a rotational inertia of 5 × 10-5 kg·m2. After it falls a distance of 0.8 meters, how fast is it going to the nearest hundredth of a m/s?
Monday, August 22, 2016 by laaamaama

Physics
wave traveling on a rope is given by y=0.25 sin(0.3 radX-40radt), where y and X is expressed in meter and t is in seconds. Determine a-Amplitude. B-frequency C-Direction of motion. e-Displacement at X=0.6 m and t=2.3 s.
Monday, August 22, 2016 by Shehab

physics
A 126 kg student sits on a chair which is solely supported by a solid 0.4 meter-long steel rod 0.81 cm in diameter. To the nearest micron (millionth of a meter), what is the change in length of the rod produced by the student's weight?
Monday, August 22, 2016 by clache

physics
In the figure below, the bar is 2.4 meters long and has a mass of 145 kg. To the nearest newton what is the tension in the wire?
Monday, August 22, 2016 by clache

physics
should the bulb of thermometer be completely immersed in boiling water to measure its boiling point
Monday, August 22, 2016 by remya

physics
A train starts from rest from a station with acceleration 0.2m/s2 on a straight track and then comes to rest after attaining maximum speed on another station due to retardation 0.4m/s2 .If total time spend is half an hour, then distance between two stations is_ ?
Monday, August 22, 2016 by binalika

physics
Why we feel pain don't having sweater and not feel pain having sweater by beating with a stick ?
Monday, August 22, 2016 by wajdan

physics
how scientists inventions are effecting the environment?
Monday, August 22, 2016 by esha

Physics
A flowerpot falls from a windowsill 25.0 m above the sidewalk. A. How fast is the flowerpot moving when it strikes the ground?? B. How much time does a cat on the sidewalk below have to move out of the way before the flowerpot hits the ground? (Please answer with step by step ...
Sunday, August 21, 2016 by Maggie

Physics
An arrow is shot straight up from the edge of a cliff with an initial velocity of 50 ft/s. Answer the following questions using English units. The acceleration due to gravity has a magnitude of 32.2 ft/s. A. Find the time to reach the highest point. (please use step by step ...
Sunday, August 21, 2016 by Maggie

Physics
A robot probe drops a camera off of the rim of a 239 m high cliff on Mars, where the free-fall acceleration is -3.7 m/s^2. A. Find the time required for the camera to reach the ground. B. Find the velocity with which it hits the ground.( shown work will be appreciated)
Sunday, August 21, 2016 by Maggie

Physics
An arrow is shot straight up from the edge of a cliff with an initial velocity of 50 ft/s. Answer the following questions using English units. The acceleration due to gravity has a magnitude of 32.2 ft/s. A. Find the time to reach the highest point. B. Find the displacement at...
Sunday, August 21, 2016 by Maggie

physics
you walk 95.0 m at a speed of 1.26 m/s and then run 95.0 m at a speed of 3.61 m/s. what is the average velocity?
Sunday, August 21, 2016 by karen

physics .Henry,Damon,Steve,Saed,bobpursley, And This is my question every one
A ball is thrown straight up by a passenger in a train that is moving what a constant velocity. Where would the ball land —back in his hands, in front of him, or behind him? Does your answer change if the train is accelerating in the forward direction? if yes, how?
Sunday, August 21, 2016 by himel

physics .Henry,Damon,Steve,Saed,bobpursley, And This is my question every one
Two cannonballs are shot in sequence from a can-non, into the air, with the same muzzle velocity, at the same launch angle. Based on their trajectory and range, how can you tell which one is made of leand and which one is made of wood. If the same cannonballs where launched in...
Sunday, August 21, 2016 by himel

physics .Henry,Damon,Steve,Saed,bobpursley, And This is my question every one
A rocket-powered hockey puck is moving on a (friction-less) horizontal air-hockey table. The x- and y-components of its velocity as a function of time are presented in the graphs below. Assuming that at t=0 the puck is at (X0,Y0)=(1,2), draw a detailed graph of the trajectory ...
Sunday, August 21, 2016 by himel

physics .Henry,Damon,Steve,Saed,bobpursley, And This is my question every one
Same rental cars have a GPS unit installed, which allows the rental car company to check where you are at all times and thus also know your speed at any time. One of these rental cars is driven by an employee in the company's lot and during the time interval from 0 to 10s...
Sunday, August 21, 2016 by himel

physics
1. If one point charge is located at each corners of a right triangle, where q1=q3= 5.0μC, q2= 2.0 μC, and a= 0.10 m. Find the resultant force felt by the third charge.
Sunday, August 21, 2016 by oishee

Physics
At the beginning of a roller coaster ride the car is staionary at the top of a 30m high hill and then begins to fall. Neglect any resistive forces. Calculate the speed of the car when it reaches the top of the second hill on the roller coaster. The second hill has abheight of 12m
Saturday, August 20, 2016 by Maddi

physics
a boy pulls a 15 kg over level ground by a rope with a force of 50 newtons at 30 degrees above the horizontal, the coefficients of friction between the box and the ground are 0.3 and 0.4, calculate the normal force exerted on the box to the ground, calculate the acceleration ...
Saturday, August 20, 2016 by bryan

physics
a 75kg person is standing on a scale in an elevator, the scale gives a readout in newtons(you have to use a free body diagram)determine the reading on the scale in newtons in each of the following situations, when the elevator is not moving, the elevator is moving upward at 2...
Saturday, August 20, 2016 by bryan

PHYSICS ASAP REPLY
What is the difference between a hydrogen filled balloon and an air filled balloon moving in air? please answer. THe question is from the chapter PRESSURE.
Saturday, August 20, 2016 by A GOODSTUDENT

Physics
A man uses a crowbar 1.5 meters long to lift a rock weighing 600N (Newtons). If the fulcrum is 0.50 Meter fromthe end of the bar touching the rock,how much effort The man should apply?
Saturday, August 20, 2016 by Hasan nagra

PHYSICS pressure
What is the difference between a hydrogen filled balloon and an air filled balloon moving in air?
Saturday, August 20, 2016 by A GOODSTUDENT

PHYSICS topic is pressure
Why does a person feel difficult to breathe when he is in a deep well? Please answer!!!
Saturday, August 20, 2016 by helpneededstudent

  1. Pages:
  2. 1
  3. 2
  4. 3
  5. 4
  6. 5
  7. 6
  8. 7
  9. 8
  10. 9
  11. 10
  12. 11
  13. 12
  14. 13
  15. 14
  16. 15
  17. Next>>

Homework Help: Science