Thursday

April 28, 2016
Number of results: 35,131

**Physics**

A discus thrower accelerates a discus from rest to a speed of 25m/s by whirling it at 1.25 rev. The discus moves in circle of radius 1m. Find a. The final angular speed, b. The constant angular acceleration, c. The time interval from rest to the speed 25m/s. Thanks for the help!
*February 28, 2016 by Edge*

**Physics**

A certain wave is incident on an interface at an angle of 40 deg. The wave emerges into the other material at an angle of 30 deg. Crossing the interface, the wave: a. increased speed b. reduced speed c. maintained constant I think reduces its speed, but I'm not sure.
*November 13, 2010 by Jarod*

**Physics**

A rifle with a weight of 20N fores a 5.0g bullet with a speed of 300m/s. (a) Find the recoil speed of the riffle (b) If a 700-N man holds the rifle firmly against his shoulder, find the recoil speed of the man and the rifle. Please show work. Thank you!
*July 14, 2013 by Xian*

**Maths-Proportions**

1) An aircraft flying at 500 km/h completes a journey in 8.4 h. How long would the journey take if it flew at a speed of 420 km/h? 2) Jackie can drive to work in 18 mins if he travels at an average speed of 35 m.p.h. How long will the journey take if she drives at an average ...
*August 22, 2015 by Sami*

**Algebra**

a boat travels 60 miles to an island and 60 miles back again. The return trip is 3 mph slower than the speed on the way out. The total time of the trip took 9 hours. Find the speed going to the island and the speed of the return trip.
*March 1, 2016 by Whatt*

**Physics**

You and a friend are going to ride on a Ferris wheel. For a little extra fun, when your friend is at the very top of the Ferris wheel she's going to drop a tennis ball. How far around the Ferris wheel in radians from your friend should you sit so you can catch the ball? ...
*June 11, 2013 by montes*

**physics**

A cheetah runs a distance of 102 m at a speed of 27 m/s and then runs another 102 m in the same direction at a speed of 34 m/s. What is the cheetah's average speed?
*September 18, 2010 by john*

**Physics**

A cheetah runs a distance of 101 m at a speed of 24 m/s and then runs another 101 m in the same direction at a speed of 38 m/s. What is the cheetah's average speed?
*August 25, 2011 by Logan*

**Maths**

The speed of a falling object is directly proportional to the time for which it falls. The speed after 5 seconds is 49 metres/seconds. What is the speed of an object which falls for 8 seconds?
*February 22, 2016 by Taylah*

**Maths**

The speed of a falling object is directly proportional to the time for which it falls. The speed after 5 seconds is 49 metres/seconds. What is the speed of an object which falls for 8 seconds?
*February 22, 2016 by Taylah*

**physics**

When a lead bullet hits a solid target at high speed, its entire kinetic energy is converted into heat. For simplicity, assume that all the heat is concentrated in the bullet rather than the target. If the bullet's initial temp. is 20` C, how fast should it be moving before ...
*February 19, 2010 by elisabeth*

**math**

The height of a rocket in meters t seconds after it is launched is approximated by the polynomial 0.5 at2 + vt + y where a is always -9.8, v is the initial velocity, and h is the initial height. The 4400i was launched from the ground at the same time the Q99 was launched from ...
*August 16, 2010 by jacob*

**Physics**

A 3,0kg cart moving East with a speed of 1.0ms^-1 collides head-on with a 5.0 kg cart that is initially moving West with a speed of 2.0 m.s^-1. After the collision, then 3.0 kg cart is moving to the left with a speed of 1.0 m.s^-1. IGNORE THE FRICTION, WHAT IS FINAL VELOCITY ...
*January 24, 2016 by Asive*

**Math**

During the first part of a trip, a canoeist travels 33 miles at a certain speed. The canoeist travels 2 miles on the second part of the trip at a speed 5 mph slower. The total time for the trip is 4 hours. What was the speed on each part of the trip? The speed on the first ...
*April 21, 2011 by Ray*

**Physics**

Several volcanoes have been observed erupting on the surface of one of Jupiter's closest moons. Suppose that material ejected from one of these volcanoes reaches a height of 4.96 km after being projected straight upward with an initial speed of 132 m/s. Given that the radius ...
*April 28, 2012 by Jane *

**Physics please help!!!!!**

A circular plate with a slot in its surface is rotating with angular velocity ω and angular acceleration α with respect to a fixed coordinate system, OXYZ. A ball B moves along the slot in the direction shown with velocity, v, and acceleration, a, both measured ...
*November 18, 2013 by Michael*

**college physics**

a golfer rides in a golf cart at an average speed of 3.10 meters/sec for 28.0 sec. she then gets out of the cart and starts walking at an average speed of 1.30 m/s. for how long in seconds must she walk if her average speed for the entire trip, riding and walking is 1.8m/s?
*October 5, 2008 by ksunhsine*

**Math-Algebra**

A car takes 3 hours to travel a distance of 240 km with a speed of 80 km/h while a motorbike can cover the same distance in 4 hours if its travels at a speed of 60 km/h. Explain why the speed and the time it takes for the vehicles to travel a certain distance exhibit an ...
*November 13, 2013 by McKenna Louise*

**Math**

The speed of sound in air at sea level at 32 degrees Fahrenheit is 1088 ft/s. If that represents only 22.04% of the speed of sound in ice-cold water, what is the speed of sound in ice-cold water, to the nearest whole number? what i did: 22.04/100 = 32/x i set up this ...
*January 16, 2015 by Katy*

**maths**

A ball is launched into the air from below a cliff. after t seconds its height above the cliff top is h metres, and is given by the equation h = − 4.9t 2 + 19.6t − 14.6. Calculate, to the nearest metre, the ...
*March 29, 2011 by elizabeth*

**Physics**

A 124-kg balloon carrying a 22-kg basket is descending with a constant downward velocity of 25.2 m/s A 1.0-kg stone is thrown from the basket with an initial velocity of 11.7 m/s perpendicular to the path of the descending balloon, as measured relative to a person at rest in ...
*September 28, 2015 by Anonymous*

**Algebra**

During the first part of a trip, a canoeist travels 98 miles at a certain speed. The canoeist travels 10 miles on the second part of the trip at a speed 5 mph slower. The total time for the trip is 3 hours. What was the speed on the FIRST part of the trip? What was the speed ...
*July 24, 2011 by Greg*

**Physics**

Particle 1 of mass 3m initially moving with a speed v0 in the positive x-direction collides with particle 2 of mass m moving in the opposite direction with an unknown speed v.After collision,particle 1 moves along the negative y-direction with speed v0/2 and particle 2 moves ...
*March 26, 2016 by Divya*

**College Physics**

Consider a rock thrown off a bridge of height 78.5 m at an angle è = 25° with respect to the horizontal as shown in Figure P4.20. The initial speed of the rock is 15.6 m/s. Find the following quantities: (a) the maximum height reached by the rock (b) the time it takes the rock...
*September 12, 2011 by HELP*

**physics**

A commuting student leaves home and drives to school at an average speed of 41.0 km/h. After 24.0 min she realizes that she has forgotten her homework and returns home to get it at the same average speed. It takes 9.0 min to find the report, after which the trip to school 41.0...
*August 29, 2011 by bill*

**physics**

A commuting student leaves home and drives to school at an average speed of 42.0 km/h. After 20.0 min he realizes that he has forgotten his homework and returns home to get it at the same average speed. It takes 7.0 min to find the report, after which the trip to school 42.0 ...
*September 8, 2013 by Lauren*

**Physics**

During volcanic eruptions, chunks of solid rock can be blasted out of the volcano; these projectiles are called volcanic bombs. (a) At what initial speed would a bomb have to be ejected, at angle 35degrees to the horizontal, from the vent at A in order to fall at the foot of ...
*December 28, 2015 by Dee*

**College physics**

A 0.45 mass is attached to a spring with a force constant of 26 and released from rest a distance of 3.2 from the equilibrium position of the spring. a.What is the maximum speed of the mass? (m/s) b.How far is the mass from the equilibrium position when its speed is half the ...
*December 3, 2009 by Mary*

**Physics**

A flywheel with a diameter of 2.45 m is rotating at an angular speed of 74.1 rev/min. (a) What is the angular speed of the flywheel in radians per second? (b) What is the linear speed of a point on the rim of the flywheel? (c) What constant angular acceleration (in revolutions...
*November 9, 2011 by kyle*

**Physics**

One end of a thin uniform rod, 1.00m in length, is attached to a pivot. The rod is free to rotate about the pivot without friction or air resistance. Initially, it is hanging straight down (the "6 o' clock position). Then the lower tip is given an initial horizontal speed of ...
*December 4, 2009 by John*

**physics**

Two cars start from rest at the same location and at the same instant and race along a straight track. Car A accelerates at 6.6 fps2 to a speed of 90 mph and then runs at this constant speed. Car B accelerates at 4.4 fps2 to a speed of 96 mph and then runs a a constant speed...
*January 22, 2011 by David*

**Physics, Elena Please Help If u can.**

A circular plate with a slot in its surface is rotating with angular velocity ω and angular acceleration α with respect to a fixed coordinate system, OXYZ. A ball B moves along the slot in the direction shown with velocity, v, and acceleration, a, both measured ...
*November 18, 2013 by Michael*

**physics**

(a) What is the escape speed on a spherical asteroid whose radius is 435 km and whose gravitational acceleration at the surface is 0.632 m/s2? (b) How far (in km) from the surface will a particle go if it leaves the asteroid's surface with a radial speed of 535 m/s? (c) With ...
*October 4, 2013 by Jeff*

**physics**

(a) What is the escape speed on a spherical asteroid whose radius is 435 km and whose gravitational acceleration at the surface is 0.632 m/s2? (b) How far (in km) from the surface will a particle go if it leaves the asteroid's surface with a radial speed of 535 m/s? (c) With ...
*October 4, 2013 by Jeff*

**physics**

An airplane is travelling at a speed of 600 mph on a heading of 345 degrees. There is a wind moving at a speed of 70 mph on a heading of 20 degrees. The pilot would like to maintain his planned course. Find the speed and heading he should set in order to travel with the wind ...
*November 15, 2015 by johnny*

**Physics**

A steel ball is dropped onto a hard floor from a height of 1.95 m and rebounds to a height of 1.87 m (assume positive direction is upward) A. Caculate it's velocity just before it strikes the floor B. calculate it's velocity just after it leaves the floor on its way back up C...
*September 18, 2014 by Edward*

**Physics**

A steel ball is dropped onto a hard floor from a height of 1.95 m and rebounds to a height of 1.87 m (assume positive direction is upward) A. Caculate it's velocity just before it strikes the floor B. calculate it's velocity just after it leaves the floor on its way back up C...
*September 20, 2014 by Edward*

**math**

Matt and Anna are frequent fliers on Fast n Go Airplanes. They often fly between two cities that are a distance of 1680 miles apart. On one particular trip, they flew into the wind and the trip took 4 hours. the return trip with the wind behind them, only took about 3 hours. ...
*May 27, 2008 by aaron*

**physics - sound level**

The source of a sound wave has a power of 2.50 µW. Assume it is a point source. (a) What is the intensity 6.70 m away? I used I = Power / 4*pi*r^2 and found I to be 4.43x10^-9 W/m^2 (b) What is the sound level at that distance? Sound level = 10 dB*log [(Intensity)/(Intensity ...
*April 21, 2007 by COFFEE*

**physical**

During July 1995 the comet Shemaker-Levy 9 smashed into Jupiter in a spectacular fashion. The comet actually consisted of 21 distinct pieces, teh largest of which had a mass of about 4x1012 kg and a speed of 6x104 m/s. Jupiter, the largest planet in the solar system , has a ...
*April 18, 2013 by Mervyn*

**physic **

A police car is travelling in a straight line with constant speed vp.A truck travelling in the same direction with speed 3/2 vp passes the police car.The truck driver realizes that she is speeding and immediately begins to slow down at a constant rate until she comes to a stop...
*February 11, 2011 by shaiz*

**Mechanics**

A bullet is fired a plank of wood with a speed of 200m/s. After passing through the plank, its speed reduces to 180m/s. Another bullet identical with a speed of 100m/s is fired at the same plank. What is the speed of this bullet after passing through the plank. (resistance ...
*October 7, 2015 by Kusemererwa Robert*

**Physics help--explosion**

Figure 9-56 shows a two-ended "rocket" that is initially stationary on a frictionless floor, with its center at the origin of an x axis. The rocket consists of a central block C (of mass M = 6.00 kg) and blocks L and R (each of mass m = 2.90 kg) on the left and right sides. ...
*December 2, 2006 by fizzix*

**Class 11th Physics**

My question is that, I read about Instantaneous Speed "Instantaneous speed of an object at an instant of time (t) is defined as the 'limit of the average speed as the time interval delta(t) at the given instant of time becomes infinitesimally small.'" What does this paragraph ...
*August 8, 2009 by Akashdeep*

**Physics **

You are driving south on a highway at 24.0 m/s (approximately 54 mi/h) in a snowstorm. When you last stopped, you noticed that the snow was coming down vertically, but it is passing the windows of the moving car at an angle of 26.6° to the horizontal. Calculate the speed of ...
*February 5, 2012 by Jeremy *

**maths**

The probability of getting a blue ball is 2/3 from a bag containing 6 blue and 3 red balls. 12 red balls are added to the bag then find the probability of getting a blue ball
*March 10, 2011 by susan*

**Physics :(( help please**

You and a friend are going to ride on a Ferris wheel. For a little extra fun, when your friend is at the very top of the Ferris wheel she's going to drop a tennis ball. How far around the Ferris wheel in radians from your friend should you sit so you can catch the ball? ...
*June 14, 2013 by john*

**math30**

Children’s meals are being prepared for a large gathering. There is an equal number of chicken, hamburger, and fish meals. Each meal comes with a toy: a ball, a parachute toy, or a Frisbee. There are twice as many balls as Frisbees and an equal number of parachutes and ...
*January 25, 2013 by alejandro*

**Algebra.. PLEASE help me!!**

Robin tosses a fair coin and then draws a ball from a bag that contains one red, one blue, and one green ball. PART A: What are the possible outcomes for the experiment? Explain. PART B: Three balls-one red, one blue, and one green-are added to the bag. Will the total number ...
*April 11, 2013 by Syram*

**physics**

Part 1 A block of mass 4 kg, which has an initial speed of 8 m/s at time t = 0, slides on a horizontal surface.Find the magnitude of the work that must be done on the block to bring it to rest. Answer in units of J. Part 2 If a constant friction force of magnitude 5 Newtons is...
*February 25, 2011 by ally*

**Physics**

A personne walking at a speed of 1.7m/s see's a stoped bus 25m from him. At this moment this person starts to run with an acceleration of 1,3m/s2. After 4 secondes this personne has reached his maximum speed et it stays constant, but at the same time the bus starts moving and ...
*March 22, 2007 by Nick*

**physics**

A skipper on a boat notices wave crests passing his anchor chain every 9 s. He estimates the distance between wave crests to be 15 m. He also correctly estimates the speed of the waves. What is this speed? Wavelenght* frequency= wave speed remember that frequency here is 1wave...
*November 5, 2006 by Barry*

**Physics**

"from zero to sixty in 8 seconds" is a description of: a) average speed b) instantaneous speed c)average acceleration d) instantaneous acceleration I know for sure that a) and c) aren't the right answers since average is over a long time period or the whole trip. I believe b) ...
*September 21, 2007 by Tammy*

**Physics**

Mary needs to row her boat across a 100m wide river that is flowing to the east at a speed of 1.0m/s. Mary can row with a speed of .0m/s a) If mary points her boat due north, how dar from her intended landing spot will she be when she reaches the opposite shore? B) What is her...
*September 14, 2012 by Jake*

**college physics**

A cruise ship of seniors is moving due west with an engine speed of 60km/hr when it encounters a current from the North at 20Km/hr. What is its relative velocity due to this current? (speed and angle) What course correction does it need to continue due west? (new angle and ...
*October 30, 2012 by Gee*

**Chemistry **

Voltaic cell. The initial concentrations of Ni2+ and Zn2+ are 1.50 M and 0.100 M. Initial cell potential=.56 V. What are the concentrations of Ni2+ and Zn2+ when the cell potential falls to 0.45 V?
*July 30, 2010 by Danielle*

**School-Age Children**

Melissa plays with the same four girls everyday.She has a lot of energy, is independent, and is concerned about what her friends think. Melissa likes soccer and baseball and takes pleasure in beating the boy's team.Melissa is most likely to be A.3-5 years-old B.5-7 years-old C...
*March 11, 2009 by Cynthia*

**physics**

A sinusoidal transverse wave of amplitude ym = 3.2 cm and wavelength = 3.4 cm travels on a stretched cord. Find the ratio of the maximum particle speed (the speed with which a single particle in the cord moves transverse to the wave) to the wave speed.
*December 24, 2010 by Bashr*

**physics**

A sinusoidal transverse wave of amplitude ym = 6.4 cm and wavelength = 5.2 cm travels on a stretched cord. Find the ratio of the maximum particle speed (the speed with which a single particle in the cord moves transverse to the wave) to the wave speed.
*December 26, 2010 by john*

**Business Calculus**

Pam and Tim decide to start saving money for their daughter's college education. They open a college savings plan (529) with a 500 dollars initial investment and next month start to make monthly deposits of 120 dollars. If the account pays 8% compounded monthly, how much will ...
*February 11, 2013 by cs94*

**Physics**

A ruler stands vertically against a wall. It is given a tiny impulse at θ=0∘ such that it starts falling down under the influence of gravity. You can consider that the initial angular velocity is very small so that ω(θ=0∘)=0. The ruler has mass m= ...
*December 7, 2013 by Geoff*

**math**

the question is: jim ran a mile in 3 min and 43 seconds how fast was his avrage speed. what was his avg. speed if the time was 353
*April 24, 2009 by bandit55751*

**Physic**

31m/s is a typical highway speed for a car. At what temperature do the molecules of nitrogen gas have an rms speed of 31 m/s? (Answer in K)
*November 21, 2009 by ana*

**Physics**

A particle executes simple harmonic motion with an amplitude of 9.00 cm. At what positions does its speed equal two thirds of its maximum speed?
*January 4, 2010 by Zoe*

**physics**

With what minimum speed must Fran leave the ground in order to lift her center of mass 1.90 m and cross the bar with a speed of 0.80 m/s?
*November 16, 2010 by yo yo*

**physics **

To the nearest order of magnitude, how many times greater than the speed of sound is the speed of light? 104 106 1010 1012
*April 10, 2011 by ashley --- HELP PLEASEE!!!*

**Physics**

A truck speed increases uniformly from 10 m/s to 30 m/s in 20 seconds. Find the ff: a. average speed b. acceleration c. distance covered during the period
*September 11, 2011 by mia*

**Geometry**

A stunt airplane travels at N 62 E at a constant speed of 400 mi/hr. There is a 20 mi/hr wind blowing doe west. What is the planes actual speed?
*February 27, 2012 by Sydney Rood*

**physics**

An automobile tire has a radius of 0.455 m, and its center moves forward with a linear speed of v = 15.7 m/s. Determine the angular speed of the wheel.
*March 11, 2012 by Katie*

**physics**

A hockey puck is hit on a frozen lake and starts moving with a speed of 14.4 m/s. 3.0 seconds later, its speed is 7.3 m/s. (a) What is its average acceleration?
*October 4, 2012 by Anonymous*

**Algebra**

A plane has a speed of p km/h in still air. It makes around trip flying with and against the wind of w km/h.Show that its average speed is p^2-w^2/p km/h
*November 5, 2013 by Jennifer*

**Algebra**

A plane has a speed of p km/h in still air. It makes around trip flying with and against the wind of w km/h.Show that its average speed is p^2-w^2/p km/h
*November 5, 2013 by Jennifer*

**Chemistry**

The speed limit on a certain highway is 72km/h. What is the speed in cm/s? Could you go through each step on how to get the answer? Lots of the questions are like this one, but I don't know how to do them.
*February 27, 2014 by Kelsi*

**physics**

what air speed and heading would enable a plane to travel [NE] with a ground speed of 275 km/h if there is a wind blowing at 55 km/h from the south?
*June 19, 2014 by joy*

**physics**

a stone is projected upward with a speed of 80.0ft/s from a 224 ft tower. find the maximum height and the speed at which it strikes the ground.
*June 21, 2014 by roger*

**Math**

Maira drives at a constant speed for 3 hours and travels 175 miles. how far would she drive in 4.5 at the same speed?
*September 22, 2014 by Eren Jeager*

**AP PHYSICS HELP**

A diver runs horizontally with a speed of 1.5 m/s off a platform that is 20 m above the water. what is his speed just before hitting the ground?
*October 31, 2015 by Anonymous*

**Physics **

A Boeing 747 has a mass of 400,000kg and a takeoff speed of 100m/s . It cruises at a height of 10,000m at a speed of 255m/s
*February 2, 2016 by Darth vader *

**science**

The graph below shows your speed at different times while riding a bicycle. For how many minutes did your speed remain constant?
*February 4, 2016 by ?*

**Physics**

A stone A is dropped from the top of a very high platform. At the same time another stone is thrown vertically upward from the ground level with an initial speed of 50m/s. At the instance that the stone passes each other, the ration of the velocities of A and B is 2:3 ...
*March 20, 2016 by Jefferson Mckinley*

**physics**

A bus and a car have an inelastic head-on collision. The bus has a mass of 1.5 × 103 kilograms and an initial velocity of +20 meters/second. The car has a mass of 9.5 × 102 kilograms and an initial velocity of -26 meters/second. What is their total momentum after the collision?
*May 28, 2013 by Anonymous*

**physics**

A bus and a car have an inelastic head-on collision. The bus has a mass of 1.5 × 103 kilograms and an initial velocity of +20 meters/second. The car has a mass of 9.5 × 102 kilograms and an initial velocity of -26 meters/second. What is their total momentum after the collision?
*July 24, 2014 by Anonymous*

**physics**

A bus and a car have an inelastic head-on collision. The bus has a mass of 1.5 × 103 kilograms and an initial velocity of +20 meters/second. The car has a mass of 9.5 × 102 kilograms and an initial velocity of -26 meters/second. What is their total momentum after the collision?
*February 25, 2016 by bianca*

**language arts**

1. Which sentence contains a predicate adjective? a. The singer's latest hit is a beautiful song b. The bus has arrived at last c. We bought four juicy apples at the farmers market d. the weather today seems very humid to me 2. which sentence correctly uses a predicate pronoun...
*February 10, 2015 by ben *

**science**

Can you check to see if I understand these questions? 1.when a jumbo jet lands, there is a decrease in both its kinetic and potential energy. where does this engergy go? -The engergy goes under the wings 5. a baseball and a golf ball have the same momentum. which has greater ...
*October 16, 2007 by Lou*

**math**

A study to determine whether or not a football filled with helium traveled farther when kicked than one filled with air found that while the football filled with helium went, on average, farther than the one filled with air, the difference was not statistically significant. ...
*October 7, 2007 by Devon*

**MATH**

Matt and Anna are frequent fliers on Fast n Go Airplanes. They often fly between two cities that are a distance of 1680 miles apart. On one particular trip, they flew into the wind and the trip took 4 hours. the return trip with the wind behind them, only took about 3 hours. ...
*May 27, 2008 by AARON*

**college Physics**

A playground is on the flat roof of a city school, 5.2 m above the street below (see figure). The vertical wall of the building is h = 6.50 m high, forming a 1.3-m-high railing around the playground. A ball has fallen to the street below, and a passerby returns it by launching...
*January 29, 2010 by Katie*

**Algebra**

Can someone help me do an example like this one. State the application, give the equation of the quadratic function, and state what the x and y in the application represent. Choose at least two values of x to input into your function and find the corresponding y for each. ...
*November 24, 2007 by Alicia*

**Physics**

A force of 310 N is applied horizontally to a crate in order to displace the crate 45.0 m across a level floor at a constant velocity. As a result of this work, the crate's internal energy is increased by an amount equal to 12 percent of the crate's initial internal energy. ...
*December 4, 2012 by Casey*

**Physics Question**

GIVEN: 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 0.580c, and the speed of each particle relative to the other is 0.920c. QUESTION: What is the speed of the second ...
*April 16, 2008 by Christina*

**math **

If you have a circle graph 15 students like basketball 10 like soccer and 5 like softball. Write a ratio problem that relates to this graph and solve the problem. ratio would be 5/6,1/6,1/3 how would a solve this if this is the right ratio. Thank you so much for your help.
*November 7, 2010 by Jill*

**AP Physics**

You are standing at the top of a cliff that has a stairstep configuration. There is a vertical drop of 6 m at your feet, then a horizontal shelf of 10 m , then another drop of 4 m to the bottom of the canyon, which has a horizontal floor. You kick a 0.49 kg rock, giving it an ...
*October 14, 2015 by MJay*

**Physics**

We saw in Example 5.7 how a centrifuge can be used to separate cells from a liquid. To increase the speed at which objects can be separated from solution, it is useful to make the centrifuge’s speed as large as possible. If you want to design a centrifuge of diameter 68 cm to ...
*September 20, 2011 by Rose*

**ashford**

16. Functional foods are those containing nutritional supplements in addition to natural nutrients. Examples include orange juice with calcium and eggs with omega-3. Kolodinsky, et al. (2008) examined attitudes toward functional foods for college students. For American ...
*May 12, 2013 by lisa*

**Exploring Space**

if a satellite were to be launched with too little speed or too much speed then what would happen? If a sattellite were to be launched with too much speed then the friction in the air would make it heat up to the point where it would burn up. Earth's gravity wouldn't be strong...
*March 15, 2010 by Sara*

**Physics**

High-speed motion pictures (3500frames/second) of a jumping 280ìg flea yielded the data to plot the flea's acceleration as a function of time as shown in the figure (Figure 1). This flea was about 2 mm long and jumped at a nearly vertical takeoff angle. Find the initial net ...
*October 10, 2013 by Jordan*

**Science/maths**

describe how you could make the following measurements and discuss any problems you might encounter a) finding the volume of a rugby ball b) finding the diameter of tennis ball. c) findin the mass of a grain of sugar a) submerge it in water in a graduated container and find ...
*March 3, 2007 by San*

**Differential Equations**

a) Sketch the phase line for the differential equation dy/dt=1/((y-2)(y+1)) and discuss the behavior of the solution with initial condition y(0)=1/2 b) Apply analytic techniques to the initial-value problem dy/dt=1/((y-2)(y+1))), y(0)=1/2 and compare your results with your ...
*February 3, 2013 by Erica*

**physics**

A body of mass 10 kg moving at a speed of 4 m/s collides with another body of mass 4 kg at rest. After collision, if the speed of the body of 4kg mass be 5 m/s, the speed of body of 10kg mass shall be?
*May 17, 2015 by Satyabrata Saha*