Saturday

February 28, 2015

February 28, 2015

Number of results: 40,471

**college physics**

a block of ice initially sliding at 15m/s on a frozenpond comes to rest after traveling 90 meters. What is the coefficient friction?
*September 25, 2010 by sarah*

**Physics**

Can an electron at rest in a magnetic field be set into motion by the magnetic field? What if it were at rest in an electric field?
*March 29, 2011 by Nikki*

**Physics**

A boy jumps from rest, straight down from the top of a cliff. He falls halfway down to the water below in 0.620 s. How much time passes during his entire trip from the top down to the water? Ignore air resistance.
*September 8, 2014 by Hoku*

**Precalculus**

When a projectile leaves a starting point at an angle of elevation of theta with a velocity v, the horizontal distance it travels is determined by: d=v^2/(32) sin2theta Where d is measured in feet and v in feet per second. An outfielder throws the ball at a speed of 75 miles ...
*January 31, 2012 by jake*

**physics**

A ski jumper starts from rest 44.0 m above the ground on a frictionless track, and flies off the track at an angle of 45.0° above the horizontal and at a height of 14.0 m from the ground. Neglect air resistance. (a) What is his speed when he leaves the track? m/s (b) What is ...
*November 8, 2012 by physics help!!*

**Physics Classical Mechanics**

A pulley of mass mp , radius R , and moment of inertia about its center of mass Ic , is attached to the edge of a table. An inextensible string of negligible mass is wrapped around the pulley and attached on one end to block 1 that hangs over the edge of the table. The other ...
*November 14, 2013 by Anonymous*

**Physics Urgent please help**

A spring of negligible mass, spring constant k = 82 N/m, and natural length l = 1.2 m is hanging vertically. This is shown in the left side where the spring is neither stretched nor compressed. In the central one, a block of mass M = 5 kg is attached to the free end. When ...
*October 15, 2013 by ss01*

**algebra 1**

A man walks at a pace of 3 miles per hour. After 2 hours he stops for a rest. Let t be time AFTER the rest when he continues on his walk. Let d be the TOTAL distance traveled since he started. Write an equation linking d and t. Would the equation look something like this or is...
*March 15, 2009 by Dippy*

**Physics**

A uniform disk with mass m = 8.54 kg and radius R = 1.35 m lies in the x-y plane and centered at the origin. Three forces act in the +y-direction on the disk: 1) a force 333 N at the edge of the disk on the +x-axis, 2) a force 333 N at the edge of the disk on the –y-axis, and ...
*November 10, 2014 by stewart*

**Repost-Physics 1**

A skier of mass 109 kg travels down a frictionless ski trail. a)If the top of the trail is a height 218 m above the bottom, what is the work done by gravity on the skier? _____J b)Find the velocity of the skier when he reaches the bottom of the ski trail. Assume he starts from...
*October 9, 2012 by John*

**physics**

I have a question based off of the response to the question I posted below. Sorry, i wanted to make sure that i clearly understood,so My question about the third solution is: Is the horizontal force zero N? or is it 721.3N? A dragster and driver together have mass 918.8 kg. ...
*July 3, 2011 by alexa*

**College Physics**

A wheel of radius 0.398 m is mounted on a frictionless horizontal axis. The rotational inertia of the wheel about the axis is 0.0576 kg·m2. A massless cord wrapped around the wheel is attached to a 0.790 kg block that slides on a horizontal frictionless surface. If a ...
*July 6, 2012 by Stephanie*

**physics**

A 2.00 kg frictionless block is attached to a horizontal spring as shown. At t = 0, the position x = 0.225 m, and the velocity is 4.25 m/s toward the right in the positive x direction. Position x as a function of t is: x = A*cos(ωt ) , where A is the amplitude of motion ...
*December 4, 2012 by toby*

**Physics**

A wooden block with mass 0.26{\rm kg} rests on a horizontal table, connected to a string that hangs vertically over a friction-less pulley on the table's edge. From the other end of the string hangs a 0.20{\rm kg} mass. What minimum coefficient of static friction \mu _{{\rm s...
*October 18, 2012 by Nichole*

**Math**

How to Generate Pythagorean Triples using an Odd Number 1. Start with an odd number, e.g. 3. Then the square of 3 can be expressed as the sum of two consecutive numbers, i.e. 32 = 9 = 4 + 5. Therefore the Pythagorean Triples are {3, 4, 5} since 32 + 42 = 52. Generate another ...
*February 22, 2012 by Kevin*

**Physics**

A 2.3 kg steel block is at rest on a steel table. A horizontal string pulls on the block. The coefficient of static friction for steel on steel is 0.80 (page 163) while the coefficient of kinetic friction is 0.60 while the acceleration due to gravity is 9.80 m/s2. If the ...
*October 10, 2011 by Me*

**Physics **

Block 1, with mass m1 and speed 4.5 m/s, slides along an x axis on a frictionless floor and then undergoes a one-dimensional elastic collision with stationary block 2, with mass m2 = 0.41m1. The two blocks then slide into a region where the coefficient of kinetic friction is 0...
*November 1, 2011 by Ashley*

**physics**

A 15 kg block is pulled 5 m across the frictionless floor with a force of 62 N at a 41 degree angle. Calculate the total work done on the block.
*January 18, 2012 by Courtney*

**AP Physics**

A car slows down from 18 m/s to rest in a distance of 91 m. What was its acceleration, assumed constant?
*March 25, 2011 by Lucas*

**Physics**

A car slows down from a speed of 24.0m/s to rest in 9.0s, How far did it travel in that time?
*January 24, 2015 by David*

**physics**

Salmon often jump waterfalls to reach their breeding grounds. Starting 1.77 m from a waterfall 0.253 m in height, at what minimum speed must a salmon jumping at an angle of 44.8 leave the water to continue upstream? The acceleration due to gravity is 9.81 m/s2 . Answer in ...
*October 16, 2012 by scott*

**Organic Chem**

how do you synthesize 1-propanol from the starting material butyraldehyde?
*November 2, 2006 by Joe*

**social studies**

are there any words from the civil war starting with the letters q,x,y and z
*June 3, 2008 by China*

**math [ i need help with these.]**

2. 2x(x+3)=0 2x^2+3x=0 [i don't know what to do.] 3. y^2+8y=0 4. x^2+3x=28 5.2x^2+9x-5=0 2x^2+9x=-5 [please help me by starting off the problems, or explaining for each.]
*October 24, 2008 by margiee (: !*

**social science **

WHAT ARE WORDS THAT REPRESENT THE DEMOCRATIC PARTY STARTING WITH D,E,M,O,C,R,A,T,I,C
*December 22, 2009 by kim*

**Com 220**

what advice would you provide for students starting this course
*October 14, 2010 by Pam*

**math**

How can you determine the starting point (y-intercept) of a linear model?
*June 14, 2011 by luie*

**mechanical physics**

how to compute capacitance for Btu in starting capacitor
*August 5, 2011 by elmer *

**English 8th**

Whats a 1st person sentence starting with E
*August 22, 2012 by Anonymous*

**maths**

list the following in order of size starting with the smallest. 1/3, 0.3, 0.29, 32%
*January 28, 2013 by chungu*

**Physics**

Three objects with masses m1= 36.5 kg m2= 19.2 kg m3= 12.5 kg Are hanging from massless ropes that run over a frictionless pulleys. If the system is released from rest, what is the magnitude of the acceleration in m/s^2 of mass m1? ___________________ O O O I I I I I I I I I I...
*January 16, 2014 by Holly*

**Physics**

Three objects with masses m1= 36.5 kg m2= 19.2 kg m3= 12.5 kg Are hanging from massless ropes that run over a frictionless pulleys. If the system is released from rest, what is the magnitude of the acceleration in m/s^2 of mass m1? ___________________ O O O I I I I I I I I I I...
*January 16, 2014 by Holly*

**Physics Help Please!**

A block of mass is moving along the horizontal frictionless surface with a speed of 5.70 m/s. If the slope is 11.0° and the coefficient of kinetic friction between the block and the incline is 0.260, how far does the block travel up the incline? Show step by step please! Thanks!!
*November 5, 2014 by Kimberly*

**relativity **

A particle called neutral pi meson (or pion) decays into two photons and nothing else. If the pion is initially at rest (rest mass 135Mev). (a) what are the energies of the photons ? (b) What are the magnitudes of the momenta of the photons (c) How are they moving with respect...
*June 8, 2011 by wally*

**Physics**

A solid and a hollow ball, each with a mass of 1 kg and radius of 0.1 m, start from rest and roll down a ramp of length 3 m at an incline of 35 degrees. An ice cube of the same mass slides without friction down the same ramp. Which ball will reach the bottom first? Does the ...
*October 18, 2011 by Temi*

**Algebra**

Hello all! I had a quick homework question: I have to prove that the output of this always ends up as 1, regardless of the starting number: *Think of a number between 1 and 10. Add 1; double the result; add 3; subtract 4; add 5; halve the result; add 6; subtract 7; add 8; ...
*June 21, 2014 by y912f*

**Physics - Newtons laws**

A block (mass m1 = 8kg) is moving on an inclined plane, coefficient of kinetic friction of 0.45, whose angle is 30degrees. This block is connected to a second block (mass m2 = 22kg) by a cord that passes over a small frictionless pulley. Find the acceleration of each block and...
*February 24, 2012 by Anonymous*

**college Physics**

Two identical 0.18 kg blocks (labeled 1 and 2) are initially at rest on a nearly frictionless surface, connected by an unstretched spring, as shown in the upper diagram, where x2 = 0.06 m. Then a constant force of 9 N to the right is applied to block 2, and at a later time the...
*October 26, 2010 by Anonymous*

**Science-Periodic Table**

starting from carbon what occurs to the ion charge as u move it to right? In my periodic table Carbon does not have a charge at all; there is just a dash in place of where a charge should be, I'm not really sure what that means. starting from carbon, what occurs to the ion ...
*April 8, 2010 by Sara*

**college physics**

a rice grain is sitting on top of an apple, it slides down. where does it come off the apple? assuming the apple is a frictionless sphere. Find the angle with respect to the vertical diameter of the apple.
*February 7, 2013 by Anonymous*

**physics**

A 39-kg girl standing at rest on slippery (frictionless) ice throws a 10-g ball forward with a speed of 10 m/s. Just afterward, the girl will
*February 3, 2012 by Emily*

**science**

the potential energy of a golf ball in a hole is negative with respect to the ground. Under what circumstances(if any) is the ball's kinetic energy negative? Its rest energy? The kinetic energy of the ball is zero when it isnt moving, whether it is ion the hole or not. Kinetic...
*February 19, 2007 by tasha*

**Physics**

The figure below shows block 1 of mass 0.200 kg sliding to the right over a frictionless elevated surface at a speed of 5.00 m/s. The block undergoes an elastic collision with stationary block 2, which is attached to a spring of spring constant 1208.5 N/m. (Assume that the ...
*December 2, 2014 by Chelsi*

**Physics HELP!**

A block of mass 3 kg slides along a horizontal surface while a 20-N force is applied to it at an angle of 25°. If needed, use g = 10 m/s2. For a coefficient of kinetic friction of 0.3 between the block and the surface, the frictional force acting on the block is most nearly 9 ...
*May 25, 2012 by Ashley*

**Biology**

If .03 M of sucrose and .02 M of glucose rest inside a cell and .01 M of sucrose, glucose, and fructose rest outside in the environment, which solutes will exhibit next diffusion into the cell and out of the cell?
*February 15, 2007 by Bioq*

**physics**

A meterstick is at rest in an inertial frame S2.If S2 moves with a speed of 0.8 c with respect to a rest frame S1, find the length of the meterstick as measured in frame S1 according to classical physics. Answer in units of m.
*March 28, 2011 by kay*

**Physics**

A train is traveling down a straight track at 25 m/s when the engineer applies the brakes, resulting in an acceleration of −1.0 m/s2 as long as the train is in motion. How far does the train move during a 50 s time interval starting at the instant the brakes are applied?
*September 11, 2013 by <3*

**Algebra**

A car travels West for 79 miles before turning at an angle of 22° North of East. The car continues on this path for 63 miles and stops. How far is the car from its starting point? Round your answer to the nearest tenth.
*February 13, 2012 by Katy*

**physics**

A bullet of mass m = 5.89 g is fired into a block of mass M = 3.09 kg that is initially at rest on the edge of a smooth table. (The table top is 0.83 m above the floor.) The bullet ends up stuck in the block, and together they fly off the table and fall to the floor. If the ...
*April 8, 2012 by Marc*

**Relativity**

A particle called neutral pi meson (or pion) decays into two photons and nothing else. If the pion (whose rest mass is 135Mev) is initially at rest (a) what are the energies of the photons? (b)what are the magnitudes of the momenta of the photons? (c) How are they moving with ...
*June 7, 2011 by Deforest*

**Physics**

An object of mass 1.00 kg is attached to a vertical spring with spring constant 100 N/m. The object is held at rest in a position such that the spring is stretched upward a distance 1.00 cm beyond its undisturbed length. If the object is released, how far will it drop before ...
*November 5, 2014 by Joe*

**physics**

A block of mass M is sliding down an inclined plane and is accelerating. Which of the following statements are true? Choices: True, False. A. The frictional force must be less than the component of Mg down the plane B. The normal force of the plane is greater than the weight ...
*December 10, 2008 by Sandhya*

**physics **

A block with mass m=6.00kg slides down a surface inclined at 37° to the horizontal. The coefficient of kinetic friction is 0.20. A string attached to the block is wrapped around a flywheel on a fixed axis as seen in the figure. The flywheel has mass 25.0 kg and moment of ...
*May 1, 2013 by allison*

**Physics**

Two identical masses are connected by a (massless, stretchless) string across a (massless, frictionless) pulley. The mass on the right is held so that the string connected to it is horizontal. Everything is initially at rest; the tension is the string is zero. The mass on the ...
*August 10, 2012 by Chad*

**physics**

A centrifuge rotor rotating at 7,000 rpm is shut off and is eventually brought uniformly to rest by a frictional torque of 1.30 m·N. If the mass of the rotor is 4.80 kg and it can be approximated as a solid cylinder of radius 0.0710 m, through how many revolutions will the ...
*November 10, 2009 by jennifer*

**physics**

Salmon often jump waterfalls to reach their breeding grounds. Starting 3.16 m from a waterfall 0.257 m in height, at what minimum speed must a salmon jumping at an angle of 37.9◦ leave the water to continue upstream? The acceleration due to gravity is 9.81 m/s2 . Answer ...
*October 16, 2012 by t*

**science**

a wooden block slides down a ramp that is 6 metrs long in 2seconds. What was the average speed of the wooden block?
*September 23, 2012 by Anonymous*

**algebra 1**

Write the equation for the line that passes through the point (6,7) and has a slope of 1/2. Give as a simplified fraction. Again, I have y equals 1/2x but not sure for the rest.
*September 26, 2009 by Elisa*

**Physics**

Any help pleeeze!! I'm totally lost on these!! 1. A 14 g coin slides upward on a surface that is inclined at an angle of 16° above the horizontal. The coefficient of kinetic friction between the coin and the surface is 0.23; the coefficient of static friction is 0.31. Find the...
*May 20, 2007 by L.A.*

**science**

A block of mass 0.5 kg is pushed a distance x against a spring with k=450 N/m. When released the block slides along a frictionless horizontal surface to a point B, the bottom of a vertical circular track of radius R=1 meter. The track is not smooth. When the block reaches ...
*June 18, 2011 by claire*

**physics **

A 30 kg block slides down a 20° ramp with an acceleration of 1.2 m/s2. What is the coefficient of kinetic friction between the block and the ramp?
*October 30, 2010 by HASANNY *

**Physics**

A rocket whish is in deep space and initially at rest relative to an inertial reference frame, has a mass of 2.55 X 10^5 kg of which 1.81 X10^5 kg is fuel. The rocket engine is then fired for 250 s during which feul is consumed at the rate of 480 kg/s. The speed of the exhaust...
*February 2, 2007 by Tammy*

**physics**

A 20 kg child on roller skates, initially at rest, rolls 4 m down an incline at an angle of 30 degrees with the horizontal. If there is no friction between incline and skates, what is the kenetic energy of the child at the bottom of the incline? (g= 9.81 m/s^2)
*December 5, 2007 by julia*

**physics**

A car is driven east for a distance of 50 km, then north for 30 km, and then in a direction 30 degrees east of north for 25 km. Sketch the vector diagram and determine a) the magnitude and b) the angle of the car's total displacement from its starting point
*September 13, 2009 by Mallory*

**physics**

A spring with spring constant k = 810 N/m is placed in a vertical orientation with its lower end supported by a horizontal surface. The upper end is depressed 25 cm, and a block with a weight of 29 N is placed (unattached) on the depressed spring. The system is then released ...
*March 25, 2010 by Lynn*

**Physics**

A ballistic pendulum was a device used in the past century to measure the speed of bullets. The pendulum consists of a large block of wood suspended from long wires. Initially, the pendulum is at rest. The bullet strikes the block horizontally and remains stuck in it. The ...
*October 26, 2012 by Jeff*

**physics**

Calculate the speed (in m/s) of a skateboarder who accelerates from rest for 4 seconds down a ramp at an acceleration of 3 m/s2.
*December 23, 2011 by Sabrina*

**physics**

Calculate the velocity of a skateboarder who accelerates from rest for 6.7 seconds down a ramp at an acceleration of 6.5 m/s2
*November 18, 2014 by lexi*

**Physics **

A 0.0124-kg bullet is fired straight up at a falling wooden block that has a mass of 3.96 kg. The bullet has a speed of 756 m/s when it strikes the block. The block originally was dropped from rest from the top of a building and had been falling for a time t when the collision...
*October 20, 2014 by Sanz*

**Physics**

A particle of charge +18.5C and mass 4.84 × 10-5 kg is released from rest in a region where there is a constant electric field of +578 N/C. What is the displacement of the particle after a time of 1.89 × 10-2 s? 1) F=Eq 2) a=F/m 3) d=vt+1/2at^2 1) F= 10693 N 2) a=220929752 m/s...
*February 7, 2015 by Salah*

**physics**

A jet plane lands with a speed of 87 m/s and can accelerate at a maximum rate of -5.30 m/s2 as it comes to rest. (a) From the instant the plane touches the runway, what is the minimum time needed before it can come to rest? What is the actual minimum distance needed to stop ...
*September 15, 2011 by ashley*

**Physics**

A ski jumper starts from rest 51.0 m above the ground on a frictionless track and flies off the track at an angle of 45.0° above the horizontal and at a height of 12.0 m above the ground. Neglect air resistance. (a) What is her speed when she leaves the track? (b) What is the ...
*May 3, 2011 by Dani*

**physics please respond**

A 16kg sled starts up a 28 degree incline with a speed of 2.4 m/s . The coefficient of kinetic friction is = 0.27. part a)How far up the incline does the sled travel? part b)What condition must you put on the coefficient of static friction if the sled is not to get stuck at ...
*May 27, 2012 by leeann*

**social studies**

are there any words found in the civil war starting with the letters q,x,y and z
*June 3, 2008 by China*

**science**

what is the starting, top, and average annuel salary of food scientists?
*September 18, 2008 by dog*

**Chemistry**

In paper chromatography, why must the starting line be drawn with pencil? Thanks!
*February 21, 2009 by Karen*

**Chemistry**

What is the product of a grignard reaction of bromotoluene and co2 as starting materials?
*April 20, 2010 by Jay*

**physics**

you drive 2.0 km east and then 1.0 km northeast. What is your total displacement from the starting point?
*September 17, 2010 by Angela*

**math**

how do you draw a graph of a relation y=-x^2+4 and use appropriate transformation starting with y=x^2
*December 9, 2010 by ted*

**science**

what is the cars motion relative to the starting point at time =8 minutes?
*March 3, 2011 by akeyuanna*

**Math**

Starting from the formula cos^2(x)+ sin^2(x)=1, prove that tan^2(x)+1 =sec^2(x).
*September 22, 2011 by Calc Student *

**science**

explain why must the ramp be angled initially to get a starting height
*October 31, 2011 by venessa*

**math - still don't get it**

I am starting to get what you are saying. but the problem is that I do not know how to round 3,560.75 and get 3,561
*August 13, 2012 by GL *

**english**

what is the starting cause that made oddyseous go on the journey . please help i really dont know
*September 18, 2012 by amanda*

**math**

Select the first five terms in the geometric sequence an= (2)^n-1, starting with ^n=1
*April 13, 2013 by Anonymous*

**algebra**

Select the first five terms in the arithmetic sequence an = 6n, starting with n = 1.
*April 13, 2013 by Anonymous*

**Chemistry**

Assume you are starting with a 10x solution. how would you make it a 7.5x dilution?
*May 27, 2013 by Nance*

**math**

Select the first five terms in the arithmetic sequence an = 8n, starting with n = 1
*February 8, 2014 by lee*

**Algebra 2**

Select the first five terms in the arithmetic sequence an=8n, starting with n=1
*May 10, 2014 by Betrice Baker*

**physics**

An Olympic diver falls from rest from the platform 10m high. At what velocity does the diver hit the water is acceleration in 9.8m/s^2. Do I assume "rest" means a initial velocity of 0? Could the formula be: d= (vf^2-vi^2)/2(a) ? as in d=10, a=9.8 vi=0 vf = √(d x 2(a)+ ...
*November 18, 2014 by jesse*

**physics**

A 10-kg block slides down a smooth inclined surface. Determine the terminal velocity of the block if the 0.1-mm gap between the block and the surface contains SAE 30 oil at 60 °F. Assume the velocity distribution in the gap is linear, and the area of the block in contact with ...
*September 4, 2011 by pramoda*

**Physics**

A mass of 0.77 kg, hanging from a spring with a spring constant of 37 N/m, is set into an up-and-down simple harmonic motion. What is the speed of the mass when moving through the equilibrium point? The starting displacement from equilibrium is 0.2 m. [Answer in meters/second]
*July 4, 2012 by Vanessa*

**Physics**

A force platform is a tool used to analyze the performance of athletes measuring the vertical force that the athlete exerts on the ground as a function of time. Starting from rest, a 60.0 kg athlete jumps down onto the platform from a height of 0.600 m. While she is in contact...
*April 8, 2014 by Jason*

**Physics**

An airplane flies 340 km due east, makes a right-angle turn, and then flies 390 km due north. Find the magnitude of the plane’s displace- ment from its starting point. Neglect the curvature of the earth. Answer in units of km
*September 30, 2012 by Crystal*

**Physics**

The horizontal force F, shown in the figure above, accelerates the 4‒kg block at 1 m/s2 to the right. Assume that the coefficient of kinetic friction is 0.5 for both blocks. Given that the 5‒kg block moves up the slope, find (a) the magnitude of the force F and (b...
*February 23, 2014 by Chrxeyshthoufov*

**Please physics help**

A 0.0124-kg bullet is fired straight up at a falling wooden block that has a mass of 3.96 kg. The bullet has a speed of 756 m/s when it strikes the block. The block originally was dropped from rest from the top of a building and had been falling for a time t when the collision...
*October 20, 2014 by Sanz*

**Algebra Grade 7**

A cat likes to play on stairs. Starting at the bottom landing, the cat jumped up 4 steps, then down 2 steps. Then the cat jumped up 5 steps and fell down 3. In two more jumps of 4 steps and then 2 steps, the cat reached the top of the stairs. How many steps are in the staircase?
*October 26, 2012 by rawr... im a dinosaur.... rawr *

**Chemistry**

I have a few question for my review. 1) How would you prepare 30.0 ml of 0.600M HNO3 From a stock solution of 4.00M HNO3? What volume in ML of the 4.00 M HNo3 will you need? 2) if a 83.5 & was repoarted for a reaction that could have produced 12.1 g of product? what was the ...
*October 10, 2013 by Matt*

**Math**

An object at rest begins moving horizontally on the x-axis, starting at position x(t) = 0 feet at time t = 0 seconds.Suppose, after exactly 2 seconds we measure the position of the object to be 3 feet to the right of the origin AND measure the object to be moving to the ...
*April 1, 2013 by Chris*

**physics**

A mass of 0.7 kg is attached to the end of a massless spring of spring constant 0.35 N/m. It is released from rest from an extended position. After 0.8 s, the speed of the mass is measured to be 1.5 m/s. What is the amplitude of oscillation? What is the total energy (relative ...
*March 28, 2012 by Katie*

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