Friday

January 30, 2015

January 30, 2015

Number of results: 29,928

**science**

A straight highway leads to the top of the base of a 50 meter tall tower. Frm the top of the tower, if yhe angles of depression of two cars on the road are 30° and 60° , then the distence between the tow cars is ................meter.
*April 24, 2012 by shankar*

**Calculus**

A chain 64 meters long whose mass is 20 kilograms is hanging over the edge of a tall building and does not touch the ground. How much work is required to lift the top 3 meters of the chain to the top of the building?
*September 29, 2012 by Ryan*

**Math**

25. A metal cube with an edge of one foot is melted into rectangular solid one-eighth of a foot in height. What is the area of the top of the top of the new solid. Please show work/explain A. 1/64 sq.ft. B. 1/8 sq.ft. C. 1/4 sq.ft. D. 4 sq.ft. E. 8 sq.ft.
*May 8, 2014 by Johnny *

**Physics -- check answers please**

1. A boy pushes a car to slow it down while the car is rolling horizontally down the road. If the boy pushes backwards on the car with 10N of force as the car rolls forward 3.0m, the amount of work done by the boy is: a)-30 b)0 c)3.3 J d)30 N•m e)300J my answer: a 2. what is ...
*April 2, 2014 by Jessica*

**Physics**

A disk and a hollow spherical shell, like a basketball, are released at the same time at the top of an inclined plane. The spherical shell has a mass M and a radius R; the disk has a mass 2M and a radius 2R. If the two objects are released at rest, and the height of the ramp ...
*November 24, 2010 by Ree*

**physics**

Find the work done when a 20 kg sled is pulled across level ground by a rope that makes a 50 deg angle with the horizontal. The sled moves 40 m and the rope is pulled with 10 N of force. If the work done by friction is 240 J, what will happen to the Kinetic Energy of the sled?
*April 11, 2013 by sped*

**calculus**

A conical tank( with vertex down) is 10 feet across the top and 18 feet deep. As the water flows into the tank, the change is the radius of the water at a rate of 2 feet per minute, find the rate of change of the volume of the water when the radius of the water is 2 feet.
*October 17, 2007 by sara*

**Phisics**

Two identical springs (neglect their masses) are used to “play catch” with a small block of mass 200 g (see the figure). Spring A is attached to the floor and compressed 10.0 cm with the mass on the end of it (loosely). Spring A is released from rest and the mass is ...
*July 3, 2011 by Luis*

**English**

I have a question about the point of view of this would be story; It starts with this sentence: I was drving down the mainstreet in a small city and was astounded to see an old buddy looking like he had been dragged through the mud.. The story will continue like this ...
*September 23, 2011 by Anthony*

**12th Grade Calculus**

When a ball is thrown straight down from the top of a tall building, with initial velocity 30 ft/sec, the distance from the release point at time t in seconds is given by s(t)=16t^2+30t. If the release point is 300 ft above ground, what is the velocity of the ball at the time ...
*October 27, 2010 by Leanna*

**physics**

A 50kg barrel of Bud is rolled up a 10 meter ramp to the back of the truck.The ramp makes a 30degree angle with the ground. What is the potential energy of the barrel at the top of the ramp? How uch work was done against gravity to get it to the top of the ramp?
*April 30, 2012 by brent k*

**now mr. damon, physics**

A 63.8 kg block of silver is at initially at 107 C. 1.0 kg of ice at its freezing point is placed onto the block to cool it. As the ice melts, the water is free to flow off (so that the water never increases in temperature). After all the ice melts, what is the final ...
*November 24, 2014 by sara*

**math **

if Amy stands 36 feet from a flagpole and the angle formed from the top of the flagpole to her feet is 38 degre, find the distance from her feet to the top of the flagpole. include correct units in your anwser and round to 2 decimal places...
*February 16, 2011 by joey*

**Physics**

A 55 kg skateboarder comes over the top of a hill at 5.0 m/s and reaches 11 m/s at the bottom. Find the total work done on the skateboarder between the top and bottom of the hill.
*May 30, 2013 by Darius*

**physics**

A daring 510 { N} swimmer dives off a cliff with a running horizontal leap, as shown in the figure below. What must her minimum speed be just as she leaves the top of the cliff so that she will miss the ledge at the bottom, which is 1.75 {m} wide and 9.00 {m} below the top of ...
*January 26, 2011 by mely*

**Markov chains**

A company has 2 machines. On any day, each machine that is working has a 1/3 chance of breaking down. If a machine breaks down during the day, it is sent to a repair facility and will be working 2 days after it breaks down. Letting the state of the system be the number of ...
*November 18, 2012 by Denise*

**math**

The area of a table top can be represented by l× w where l is the length and w is the width.What is the area of the table top if l=60 in and w=40 in?
*December 1, 2012 by Kim*

**pen state university**

A fan blade, initially at rest, rotates with a constant acceleration of 0.025 rad/s 2 . What is the tim e interval required for it to reach a 4. 2-rad displacem ent after starting from rest?
*November 3, 2013 by steve lucas*

**Socials-Improved answer**

The primary source I read was about Griggs, a chimney sweeper and small child who escorted him.The fire had been lighted as early as 2 o'clock the same morning, and was burning on the arrival of Griggs and his little boy at eight. Griggs had no sooner extinguished the fire ...
*November 27, 2009 by Sara*

**Physics**

A golf ball is released from rest from the top of a very tall building. Choose a coordinate system whose origin is at the starting point of the ball, and whose y axis points vertically upward. The acceleration of gravity is 9.8 m/s^2. a.Neglecting air resistance, calculate the...
*February 9, 2014 by Fabricus*

**physics**

A test car starts out from rest on a horizontal circular track of 80m radius and increases it's speed at a uniform rate to reach 27.78 m/s in 10s. Find the magnitude of the total acceleration of the car 8s after the start. Ok so I know that the total acceleration is the square...
*October 9, 2009 by Jessi*

**phisics**

The drawing shows two boxes resting on frictionless ramps. One box is relatively light and sits on a steep ramp. The other box is heavier and rests on a ramp that is less steep. The boxes are released from rest at A and allowed to slide down the ramps. The two boxes have masse
*October 21, 2012 by greg*

**Physics**

Calculate the height that a block of ice at 0°C must be dropped to completely melt upon impact. Assume that all of the initial gravitational potential energy of the block goes into melting the ice. Hmmmm. http://www.jiskha.com/display.cgi?id=1162768243
*November 5, 2006 by Jennifer*

**Chemistry**

(a) Propylene, H2C=CH-CH3, can be reacted to form a polymer known as polypropylene (PP). What type of polymerization reaction is most appropriate for the formation of polypropylene? i)Addition Polymerization ii)Anionic Polymerization iii)Condensation Polymerization (b) What is...
*January 11, 2013 by Chemgam*

**PHYSICS**

HOW DO YOU FIND THE VELOCITY OF A 20 kg SOLID CYLINDER WITH A .25 m RADIUS WHEN IT IS RELEASED FROM THE TOP OF A 10 m LONG RAMP INCLINED AT 30 DEGREES? The potential energy at the top is mg10/sin30 The Ke at the bottom is 1/2 mv^2, plus 1/2 Iw^2 but w= v/r so KE = 1/2 mv^2 + 1...
*December 12, 2006 by NICOLE*

**Math repost **

trapezium ABCD, with AB and DC being parallel, with diagonal connecting A and C, angle ABC is 86, angle ADC is y, angle dac is 66 and angle bac is x, no angle given for bcd or bca or acd. find x and y, So I said that BCD is 94 deg, but then I get stuck I think I'm probably ...
*February 5, 2014 by Evie*

**Physics**

The images produced by a converging camera lens are upside down. Does this mean the photographs taken with the cameras are upside down?
*March 3, 2008 by Kaity*

**physics**

A fisherman's scale stretches 2.8 cm. when a 2.1 kg. fish hangs from it. What will be the frequency of vibration if the fish is pulled down and released so that it vibrates up and down?
*May 3, 2012 by nicole*

**physics**

A fisherman's scale stretches 2.3 cm. when a 2.5 kg. fish hangs from it. What will be the frequency of vibration if the fish is pulled down and released so that it vibrates up and down?
*May 6, 2013 by Nicole *

**physics**

ok a person is holding onto a piece of string at the end of the string is a ball the person whrils it around in a circle i've been asked what's the mininum value of at the top of the circle (this is swung around in a verticle circle) what is the mininum value the velocity ...
*August 11, 2009 by physics*

**Math**

I am doing homework and supposed to write down prime numbers up to 50, this is what I wrote down. (1,3,5,7,11,13,17,22,23,2731,33,35,37,41,43,45,47) Is there any numbers missing?
*September 7, 2011 by JJ*

**math**

Determine the down payment and the amount to be financed for each home described below. (a) $380,380; 10% down
*November 5, 2012 by Anonymous*

**Physics**

An object m is released from the top of an inclined, frictionless plane that is inclined at angle theta with the horizontal. The top of the ramp has height h. Which of the following would change the acceleration of the object if it were released from the top of the ramp? a) ...
*October 30, 2012 by Bob Loblaw*

**physics**

A man starts running a race with velocity v. in the begining of race he finds wind is blowing at an angle alpha with the track. As he progress straight horizontal road wind appears to rotate uniformly and by the gime he completes the race wind appears to rotate by an angle ...
*July 27, 2011 by Sonu*

**physics**

3- An electric motor can accelerate a Ferris wheel of moment of inertia (I =20 000 kg.m2) from rest to (10.0 rev/min) in (12.0 s). When the motor is turned off, friction causes the wheel to slow down from (10.0 to 8.00 rev/min) in (10.0 s). Determine (a) the torque generated ...
*March 16, 2013 by a*

**Algebra--please help!**

I'm having some trouble with my algebra homework. Please walk me through the question completely and give me the answer so I can fully understand it if I would ever need to solve a similar problem. Here's the problem: #1: Jon begins jogging at a steady 3 meters/sec down the ...
*January 6, 2009 by Caroleen*

**Algebra--help really needed!**

I'm having some trouble with my algebra homework. Please walk me through the question completely and give me the answer so I can fully understand it if I would ever need to solve a similar problem. Here's the problem: #1: Jon begins jogging at a steady 3 meters/sec down the ...
*January 6, 2009 by Caroleen*

**Simplfing Fractions**

Three problems I need to know if I am correct or not if not I will place how I got the answer and maybe some one can show me where I messing up aT Simplify 1+2/3 over top 2+1/2 My answer was 2/3 to me it does not seem right If I am wrong please let me know i will put all the ...
*June 1, 2007 by Toni*

**language arts**

Read the sentence. Running down the sidewalk, a hole in the pavement caused me to trip. Which revision of the sentence is grammatically correct? a)Running down the sidewalk,there was a hole in the pavement, I tripped on it. b)Running down the sidewalk, the pavement had a hole ...
*May 18, 2014 by gwen*

**science**

a ball is thrown straight upward and returns to the thrower's hand after 3.00s in the air. A second ball is thrown at an angle of 30.0 deg with the horizontal. At what speed must the second ball be thrown so that it reached the same height as the one thrown vertically?
*September 8, 2009 by tani*

**Math**

Stacey drew a triangle on a coordinate plane. She wrote down the ordered pair for each vertex. How many ordered pairs did she write down?
*February 27, 2013 by Helen*

**physics**

A fisherman’s scale stretches 3.05 cm when a 2.5-kg fish hangs from it. What will be the frequency of vibration if the fish is pulled down 13.60 cm more and released so that it vibrates up and down?
*March 5, 2013 by Anonymous*

**Physics**

I'm stumped: So bringing it back to the top. Hope that's ok! 2 charges, Q1 and Q2, equal magnitude, but different signs (not assigned) lie on a line, x axis, a known distance apart. Segment p-q lies centrally on the line, distance apart is known. An electron is released at p ...
*February 4, 2009 by charlie*

**physics**

A force of 40.0N is required to pull a 10.0kg wooden block at a constant velocity across a smooth glass surface on Earth. What force would be required to pull the same wooden block across the same glass surface on the planet Jupiter.
*February 22, 2009 by Rena*

**Physics**

A stone is thrown vertically upward from the top of the tower with a velocity of 15m / s. Two seconds later a second stone is dropped from the top of the tower.if both the stone strike the ground simultaneously find the height of the tower
*September 28, 2014 by Anonymous*

**Physics**

A projectile is launched from ground level to the top of a cliff which is 195m away and 135m high (as shown in the figure ).If the projectile lands on top of the cliff 6.9s after it is fired, find the initial velocity of the projectile a)magnitude b)direction Neglect air ...
*September 12, 2009 by Jannie*

**physics**

A projectile is launched from ground level to the top of a cliff which is 195 m away and 155 m high. If the projectile lands on top of the cliff 9.2 s after it is fired, find the initial velocity of the projectile (magnitude and direction). Neglect air resistance. Calculate ...
*September 22, 2010 by Sam*

**trig**

Two office towers are 43m apart. From the top of the shorter tower, the angle of elevation to the top of the taller tower is 26o while the angle of depression to the base is 51o. Determine the height of each tower and round your answers to one decimal place.
*November 8, 2011 by max*

**Calculus**

a 5m ladder rests against a vertical wall. The top of the ladder begins sliding down the wall at 2m/sec, while the foot of the ladder moves away from the base of the wall. How fast is the foot of the ladder moving away from the wall at the instant the foot of the ladder is 4m ...
*December 21, 2012 by Lost One*

**PHYSICS**

A 58.3 kg diver steps o a diving board and drops straight down into the water. The water provides an average net force of resistance of 1596 N to the diver’s fall. The acceleration of gravity is 9.81 m/s2 . If the diver comes to rest 4.7 m below the water’s surface, what is ...
*October 18, 2008 by MIKE HUNT*

**Physics**

Pigeons are bred to display a number of interesting characteristics. One breed of pigeon, the "roller," is remarkable for the fact that it does a number of backward somersaults as it drops straight down toward the ground. Suppose a roller pigeon drops from rest and free falls ...
*October 23, 2011 by Joseph*

**English**

1. The other robber forced me back to the safe. (What is the part of speech of 'back' in the sentence?) 2. He was carring the glass necklace and started down the stairs. 3. He was carring the glass necklace and started coming down the stairs. 4. He was carring the glass ...
*November 17, 2011 by rfvv*

**Physics**

A package of dishes (mass 50.0 kg) sits on the flatbed of a pickup truck with an open tailgate. The coefficient of static friction between the package and the truck's flatbed is 0.330, and the coefficient of kinetic friction is 0.230. (a) The truck accelerates forward on level...
*October 16, 2012 by Kira*

**physics**

A monkey of mass m climbs a rope slung over a light frictionless pulley.The opposite end of the rope is tied to a block of Mass M lying on a smooth horizontal plane.Find the acceleration of the block and tension in the rope in the following cases 1)the monkey moves up with an ...
*June 15, 2013 by raven*

**Physics**

A merry-go-round in the park has a radius of 1.8 m and a rotational inertia of 900 kgm^2. A child pushes the merry-go-round with a constant force of 80 N applied at the edge and parallel to the edge. A frictional torque of 12 Nm acts at the axle of the merry-go-round. a. What ...
*January 20, 2010 by Bell*

**Calculus**

You are given a 60 inch by 30 inch piece of cardboad and asked to make a six-sided box. If the cardboard is cut along the lines shown, what will the dimensions of the box with maximum volume? The diagram looks as follows: it is a rectangle with a shaded square in the top left ...
*January 3, 2011 by Alex*

**Physics**

A fisherman's scale stretches 4.2 cm when a 3.0 kg fish hangs from it. What will be the amplitude and frequency of vibration if the fish is pulled down 2.3 cm more and released so that it vibrates up and down?
*February 18, 2010 by Justin*

**Physics**

A train travels at a speed of 24 m/s. Then it slows down uniformly at 0.065 m/s2 until it stops. What distance does the train travel while slowing down?
*June 19, 2012 by LaWanda*

**Physics**

A train travels at a speed of 24 m/s. Then it slows down uniformly at 0.065 m/s2 until it stops. What distance does the train travel while slowing down?
*June 19, 2012 by LaWanda*

**Physics/Math**

A stuntman drives a car (without negative lift) over the top of a hill, the cross section of which can be approximated by a circle of radius R = 110 m. What is the greatest speed at which he can drive without the car leaving the road at the top of the hill?
*February 12, 2007 by COFFEE*

**Trigonometry**

A 30foot flagstaff is fixed in the center of a circular tower 40 feet in diameter. From a point in the same horizontal plane as the foot of the tower the angles of elevation of the top of the flagstaff and the top of the tower are found to be 36 and 30 degree respectively. ...
*August 31, 2014 by Anonymous*

**Physics**

Consider a coin which is tossed straight up into the air. After it is released it moves upward, reaches its highest point and falls back down again. Air resistance can be neglected. What force acts upon the coin when it is at its highest point? a. Force acting up and ...
*June 30, 2013 by Laura*

**History**

Details of Rampurva Bull Capital with photographs http://cla.calpoly.edu/~jwetzel/India/slides/BullCapital.html http://www.cyberjalgaon.com/heritage/architec.htm http://images.google.com/images?q=Rampurva%20Bull%20Capital&hl=en&lr=&ie=UTF-8&safe=off&sa=N&tab=wi http://www....
*July 27, 2006 by Tuhin*

**Chemistry**

Calculate the S(univ) for the following phase change at 25 deg celcius. The boiling point of heptane is 98.0 Celcius and has a Delta Hvap= +21.6kj/mol. C7H16(l)--> C7H16(g) Delta S= +79.0j/k I know that the equation is Delta Suniv= DSsys + DSsurr but for DSurr= -0.216J/371k...
*November 22, 2014 by Hank*

**Physics**

A ball rolling on an inclined plane dors so with constant acceleration. One ball, A, is released from rest on the top of an inclined plane 18m long to reach the bottom 3s later. At the same time as A is released, another ball, B, is projected up the same plane with a certain ...
*March 24, 2013 by Edward.Oki *

**Physics**

If 100 m sprinters accelerate from rest for 3.5 s at 2.8 m/s^2, how far have they run to this point? How long will it take them to complete the 100 m sprint, assuming they maintain their speed the rest of the way? I found the distance, which is 17 m, and the distance they ...
*September 30, 2010 by Emily*

**Math 5th grade**

Sorry for re-post. Damon answered but I do not see any relate between number.The question is: Look for a pattern. Have a rectangle with number 10, 16 and 23 in the corners.The circle inside rectangle with 9, 12 and 24 inside circle. Place the numbers from 8 to 26 either inside...
*February 17, 2014 by Tien*

**Physics**

Two pieces of paper are on a DVD movie disk. Paper A is farther from the center of the disk than Paper "B". The DVD disk starts to play and then starts to spin. Which statement is true? a. Paper "A" experiences a greater tangential acceleration than Paper "B" b. Paper "A" ...
*April 15, 2009 by Sandy*

**Physics**

Two pieces of paper are on a DVD movie disk. Paper A is farther from the center of the disk than Paper "B". The DVD disk starts to play and then starts to spin. Which statement is true? a. Paper "A" experiences a greater tangential acceleration than Paper "B" b. Paper "A" ...
*April 15, 2009 by Sandy*

**Physics**

A ski slope drops at an angle of 24 degrees with respect to the horizontal and is 500 m long. A 60 kg skier skis down from the top to the bottom of the slope. A.) Determine the change in gravitational potential energy of the skier+earth system. b.) If 20% of the gravitation ...
*November 12, 2012 by Iza*

**physics**

A ski slope drops at an angle of 24 degrees with respect to the horizontal and is 500 m long. A 60 kg skier skis down from the top to the bottom of the slope. A.) Determine the change in gravitational potential energy of the skier+earth system. b.) If 20% of the gravitation ...
*July 14, 2014 by bibs*

**mathematics**

so i have this table of values demonstrating the size of a cube to the number of small cubes with one face painted. The table starts with an x value (or number of small cubes) at 3x3x3, and goes up to 8x8x8. I need to fill in the y-column (or number of small cubes with one ...
*February 4, 2009 by danielle*

**Geometry/ SAT Math**

This was an SAT question of the day, but I can't figure out how to come up with the right answer, I think you use Pythagoras Theorum but I'm not sure. Can anyone help with the process here? A 25-foot ladder is placed against a vertical wall of a building, with the bottom of ...
*February 18, 2009 by anonymous*

**Calculus**

A 23 foot ladder is leaning on a 6 foot fence. The base of the ladder is being pulled away from the fence at the rate of 7 feet/minute. How fast is the top of the ladder approaching the ground when the base is 6 from the fence? [Note: The ladder is protruding over the top of ...
*October 13, 2011 by Isiah*

**Physics**

You are at a furniture store and notice that a Grandfather clock has its time regulated by a physical pendulum that consists of a rod with a movable weight on it. When the weight is moved downward, the pendulum slows down; when it is moved upward, the pendulum swings faster. ...
*January 3, 2012 by Lexi*

**physics**

A block of mass 2.50 kg is pushed 2.80 m along a frictionless horizontal table by a constant 12.0 N force directed 25.0° below the horizontal. (a) Determine the work done by the applied force. J (b) Determine the work done by the normal force exerted by the table. J (c) ...
*October 10, 2012 by monic*

**physics**

A block of mass 2.50 kg is pushed 2.80 m along a frictionless horizontal table by a constant 12.0 N force directed 25.0° below the horizontal. (a) Determine the work done by the applied force. J (b) Determine the work done by the normal force exerted by the table. J (c) ...
*October 12, 2012 by monic*

**Math Help**

Parallelogram PARL~ parallelogram. WXYZ. Find the value of C. Parallelogram 1 has P in the left bottom point, A in the top point, R the right top point, L in the bottom right point. 22 on the right part and 28 on the bottom. Parallelogram 2 has W in the left bottom point, X on...
*November 20, 2014 by callie*

**physics**

A lumberjack (mass = 95.7 kg) is standing at rest on one end of a floating log (mass = 218 kg) that is also at rest. The lumberjack runs to the other end of the log, attaining a velocity of +2.54 m/s relative to the shore, and then hops onto an identical floating log that is ...
*October 2, 2014 by alika*

**Math**

Driving down a mounain Jim finds that he has descended 1800FT in elevation by the time he is 3.25 mi horizontally away from the top of the mountain find the slope of his decent to the nearest hundreth. I am sorry that you did not get a response to your post earlier. You need ...
*February 13, 2007 by David*

**Math**

In how many different ways can the top eight new indie bands be ranked on a top eight list? The top hit song for each of the eight bands will compete to receive monetary awards of $1000, $500 and $250, respectively. In how many ways can the awards be given out? I think the ...
*July 29, 2011 by Jen*

**Math**

A refrigerated truck leaves a rest stop traveling at a steady rate of 56 mi/h. A car leaves the same rest stop 1/4 h later followinf rhe truck at a steady rate of 64 mi/h. How long after the truck leaves the rest stop wil the car overtake the truck. In algebra form.
*January 27, 2011 by Please help*

**physics**

From the top of a tall building, a gun is fired. The bullet leaves the gun at a speed of 340 m/s, parallel to the ground. As the drawing shows, the bullet puts a hole in a window of another building and hits the wall that faces the window. (y = 0.56 m, and x = 7.0 m.) Using ...
*March 5, 2013 by Anonymous*

**math**

In an extra-sensory-perception experiment, a blindfolded subject has two rows of blocks before him. Each row has blocks numbered 1 to 10 arranged in random order. The subject is to place one hand on a block in the first row and then try to place his other hand on the block ...
*October 18, 2007 by Anonymous*

**Physics**

A projectile is launched from ground level to the top of a cliff which is 195 m away and 155 m high. If the projectile lands on top of the cliff 9.2 s after it is fired, find the initial velocity of the projectile (magnitude and direction). Neglect air resistance. Also ...
*September 23, 2010 by Sam*

**Physics (College)**

One simple model for a person running the 100 m dash is to assume the sprinter runs with constant acceleration until reaching top speed, then maintains that speed through the finish line. If a sprinter reaches his top speed of 10.8 m/s in 2.54 s, what will be his total time?
*November 4, 2011 by Set8*

**science**

A simple model for a person running a 100m race is to assume the sprinter runs with constant acceleration until reaching top speed, and then maintains that speed through the finish line. If a sprinter reaches their top speed of 11.2ms-1 in 2.15s, what will be their total time?
*September 4, 2012 by Emily*

**physics**

a skier moving at 15 m/s down a 20 degree slope encounters a region of wet snow of coefficient of friction is 0.8. how far down the slope does she go before stopping
*October 21, 2012 by Jazmin*

**Psychics**

A freight car is moving freely along a railroad track at 7.0 m/s and collides with a tanker car that is at rest. After the collision, the two cars stick together and continue to move down the track. What is the magnitude of the final velocity of the cars if the freight car has...
*March 17, 2011 by Kendra *

**physics**

A light ray strikes a flat, L = 1.6 cm thick block (depth) of glass of refractive index 1.49 at an angle of 30 with the normal. Calculate the lateral shift of the light ray, d. there is a digram showing the light ray continuing at the same angle (30* to normal) until it exits ...
*April 27, 2010 by lauren*

**Physics**

Train A starts at 4 miles South of a bridge and heads North at a constant speed of 30 miles per hour. Train B starts 6 miles North of the bridge. a. What velocity must Train B have so that the two trains cross the bridge at the same time? b. If Train B goes at 35 miles per ...
*February 26, 2013 by Dan*

**Physics**

You have a tiny slip of paper and a large rectangular wooden block. If you put both of them side-by-side and drop the two to the floor from the same height, the block gets to the floor first. Can you think of (and describe) three “simple” ways (using nothing, absolutely ...
*April 25, 2011 by Rob*

**Math**

Q1.A tree was chopped by the Samuels family for the holidays. How tall was the tree originally if the piece they chopped down was 7feet tall, and fell 4 feet from the stump? Q2. Mr pratt's rake is leaning up against a wall. If the top of the rake hits the wall 5 feet above the...
*January 24, 2015 by Daisy*

**physics**

In the figure below, a stuntman drives a car (without negative lift) over the top of a hill, the cross section of which can be approximated by a circle of radius R = 240 m. What is the greatest speed at which he can drive without the car leaving the road at the top of the hill?
*July 15, 2010 by Sam*

**physics**

In one day, a 75-kg mountain climber ascends from the 1500-m level on a vertical cli to the top at 2400 m. The next day, she descends from the top to the base of the cli, which is at an elevation of 1350 m. What is her change in gravitational potential energy (a) on the ...
*August 17, 2012 by zianna*

**Chemistry**

Calculate the S(univ) for the following phase change at 25 deg celcius. The boiling point of heptane is 98.0 Celcius and has a Delta Hvap= +21.6kj/mol. C7H16(l)--> C7H16(g) Delta S= +79.0j/k I know that the equation is Delta Suniv= DSsys + DSsurr PLEASE SOMEONE HELP ME WITH...
*November 24, 2014 by Jared*

**Physics**

A 24.00 kg block at rest on a horizontal frictionless air track is connected to the wall via a spring. The equilibrium position of the mass is defined to be at x=0. Somebody pushes the mass to the position x=0.3500 m, then lets it go. The mass undergoes simple harmonic motion ...
*November 8, 2014 by Liz*

**physics**

Q. A person wants to shoot a rocket off of a mountain 3.26 km high so that the rocket, when shot at 31.3¡Æ above the horizontal from the very top of the mountain, lands at the foot of the mountain 9.37 km (horizontal distance) away. a) What initial speed must the rocket have...
*October 17, 2010 by Lyn*

**college physics**

urgent help please...i need answers for this... 1.) a sprinter accelerates from rest to 10.0 m/s in 1.35 s. what is her acceleration in a.) in m/s squared b.) in km/h squared. 2.) a car slows down from a speed of 25.0 m/s to rest 5.00 s. how far did it travel in that time..? 3...
*July 29, 2009 by darz*

**phy**

1 An object is thrown upward from the edge of a tall building with a velocity of 10 m/s. Where will the object be 3 s after it is thrown? Take g=10ms−2 15 m above the top of the building 30 m below the top of the building 15 m below the top of the building 30 m above the...
*January 28, 2013 by christ*

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