Monday

November 24, 2014

November 24, 2014

Number of results: 53,482

**Physics**

A model rocket is launched straight upward with an install speed of 57.6 m/s. it accelerates with a constant upward acceleration of 1.70m/s^2 until its engines stop at an altitude of 240m. A. What is the maximum height reached by the rocket? The acceleration of gravity is 9....
*September 11, 2013 by Ashley*

**Math**

The acceleration a(t) of a moving object is given by the derivative of the velocity function v(t). Find the acceleration of the object at time t=5 seconds if v(t)=12tsquared+8t meters per second. Thanks for any help.
*May 14, 2008 by John*

**math**

Use the appropriate sum/difference formula to find the exact value of cos(105°). do we choose one, then make 1 side equal cos of 105°? I dont understand the question.
*April 15, 2012 by Anonymous*

**Physics Can you please get me started**

In a running event, a sprinter does 5.5 105 J of work and her internal energy decreases by 8.8 105 J. Determine the heat transferred between her body and surroundings during this event. ________ J
*November 29, 2012 by amela*

**physics**

the coefficient of starting friction for wood on wood is 0.55. What is the force of friction of a wood block of mass 3.5 kg being pulled on a wood floor? i think i use the formula F=mMA where F is the force needed to move a solid from rest, m=coefficient of friction, M=mass of...
*October 17, 2010 by courtney*

**Chemistry**

The diffusion coefficient of silver (Ag) in copper (Cu) has the following values: T (K) D (m2s-1) 923 5.42 x 10-16 1173 1.34 x 10-13 (a) Calculate the activation energy for diffusion of silver in copper. Express your answer in units of J/mol. (b) You have two specimens of ...
*December 14, 2012 by Odesa*

**Chemistry**

A basketball is inflated in a garage at 25 degrees C to a gauge pressure of 8.0 psi. Gauge pressure is the pressure above atmospheric pressure, which is 14.7 psi. The ball is used on the driveway at a temperature of -7 degrees C and feels flat. What is the actual pressure of ...
*January 4, 2007 by Cuzzy*

**AP ECE Physics**

A car at the Indianapolis-500 accelerates uniformly from the pit area, going from rest to 295 km/h in a semicircular arc with a radius of 190 m. Determine the tangential acceleration of the car when it is halfway through the turn, assuming constant tangential acceleration. 5....
*October 9, 2012 by John Conlan*

**math**

find two pairs of numbers with the given number as their least common multiple the numbers are 10 36 60 105
*August 28, 2008 by jayvon*

**MATH**

THE AMOUNT OF CLOTH USED TO MAKE FOUR CURTAINS IS GIVEN BY THE FUNCTION A=-4X^2 + 40X WHERE X IS THE WIDTH OF ONE CURTAIN IN FEET AND a IS THE TOTAL AREA IN SQUARE FEET. FIND THE WIDTH THAT MAXIMIZES THE AREA OF THE CURTAINS. WHAT IS THE MAXIMUM AREA?
*October 7, 2014 by Anonymous*

**Physics**

Two massless springs (S1 and S2) are arranged such that one hangs vertically downward and the other is vertically upward, as shown in figure (a). When a 0.275-kg mass is suspended from S1, it stretches by an amount Δx1 = 0.062 m, as shown in figure (b). Spring S1 is now ...
*October 23, 2014 by Anonymous*

**Physics**

A 4.00kg crate is slowly lifted to a height of 1.50m. a.How much work is done by the lifting force? b.against gravity? C.by gravity? a, Work done is m*g*height b. the work done is against gravity. c. Because the box is lifted, the work done by gravity is negative (-mgh)
*September 16, 2006 by stefy*

**biology**

Need help with FOV area (mm2) totally confused? im confused i have the FOV diameter they are: 4x = 5 10x = 2 40x = 0.5 a classmate told me she thinks the area for 40 x is: pi(5/2)^2 = 19.6 not sure if thats true or how to do it for the low and medium, magnification. please ...
*May 22, 2012 by jess*

**physics**

A blue ball is thrown upward with an initial speed of 24.1 m/s, from a height of 0.6 meters above the ground. 2.9 seconds after the blue ball is thrown, a red ball is thrown down with an initial speed of 8.5 m/s from a height of 31.8 meters above the ground. The force of ...
*August 30, 2014 by Anonymous*

**Physics**

Three forces acting on an object are given by F1 = (-8.79i + 8.34j) N, F2 = (7.06i + -3.02j) N, and F3 = (-3.05i) N. The object experiences an acceleration of magnitude 2.26 m/s2. What are the components of the acceleration vector?
*September 13, 2009 by Luke*

**Chem**

1. According to the phase diagram for water, how is the state of water determined? a. proceed up a vertical line at any given temperature b. read the phase at the intersection of any given temperature and pressure c. at a given pressure, proceed horizontally to the S-L or L-G ...
*October 13, 2011 by Angel*

**physics (clear answer)**

An airplane traveling north at 400 m/s is accelerated due east at a rate of 50 m/s2 for 6 s. If the effects of air resistance and gravity are ignored, what is the final speed of the plane?
*February 5, 2014 by jason*

**physics**

016 10.0 points One of the great dangers to mountain climbers is an avalanche, in which a large mass of snow and ice breaks loose and goes on an essentially frictionless “ride” down a mountainside on a cushion of compressed air. The acceleration of gravity is 9.8 m/s2 . 30.5&#...
*October 14, 2014 by Kyle*

**physics**

016 10.0 points One of the great dangers to mountain climbers is an avalanche, in which a large mass of snow and ice breaks loose and goes on an essentially frictionless “ride” down a mountainside on a cushion of compressed air. The acceleration of gravity is 9.8 m/s2 . 30.5&#...
*October 14, 2014 by Kyle*

**math**

how about if the raduis of right circular cone is given and the surface area is given what is the formula? help please?
*July 13, 2011 by jazz*

**Chemistry**

if you are given the equation 2NO(g)+o2(g)->2NO2 and you are given the volume of NO is 150mL. how do you find what the volume of O2 is required (at the same pressure and temperature)?
*November 5, 2014 by Gene*

**Science**

A satellite orbiting at an elevation of 3200 km does what a) Stays beyond the earth's gravity, which is why it stays up there. B) in an elliptical orbit, since its speed is less than the escape velocity. C) Falling toward earth with an acceleration equal to g. D) Falling ...
*September 11, 2011 by Erica*

**calculus**

Suppose the volume, V , of a spherical tumour with a radius of r = 2 cm uniformly grows at a rate of dV/dt= 0.3 cm^3/day where t is the time in days. At what rate is the surface area of the tumour increasing? The volume of a sphere is given by V =4 3πr^3and the surface ...
*November 1, 2014 by Quratulann*

**physics**

A dart gun is ﬁred while being held horizontally at a height of 1.19 m above ground level, and at rest relative to the ground. The dart from the gun travels a horizontal distance of 3.33 m. A child holds the same gun in a horizontal position while sliding down a 36.4 ...
*November 12, 2012 by gracie*

**physics**

A dart gun is ﬁred while being held horizontally at a height of 1.19 m above ground level, and at rest relative to the ground. The dart from the gun travels a horizontal distance of 3.33 m. A child holds the same gun in a horizontal position while sliding down a 36.4 ...
*November 12, 2012 by gracie*

**math Ms. Sue please ASAP**

3. Find the surface area for a cylinder with a height of 24 and a radius of 6. Use 3.14 for pi and round to the nearest whole number. 904 yd^2 1,017 yd^2 1,130 yd^2 2,713 yd^2 4. Find the volume for a cylinder which has a height of 24 and a radius of 6. Use 3.14 for pi and ...
*March 6, 2013 by Delilah*

**Physics**

The acceleration of gravity on the moon is about 1.6 m/sec2. An experiment to test gravity compares the time it takes objects to reach a speed of 10 m/sec after being dropped from rest. How long does an object dropped on the moon have to fall compared to an object dropped on ...
*September 4, 2007 by Stephanie*

**PHYSICS **

Suppose a distant world with surface gravity of 7.12 m/s2 has an atmospheric pressure of 7.48 104 Pa at the surface. (a) What force is exerted by the atmosphere on a disk-shaped region 2.00 m in radius at the surface of a methane ocean? ________N (b) What is the weight of a 10...
*November 8, 2012 by Amy*

**physics**

Two objects of equal mass are on a turning wheel. Mass 1 is located at the rim of the wheel while mass 2 is located halfway between the rim and the axis of rotation. The wheel is rotating with a non-zero angular acceleration. For each of the following statements select the ...
*March 20, 2012 by Miriam*

**Physics**

Two objects of equal mass are on a turning wheel. Mass 1 is located at the rim of the wheel while mass 2 is located halfway between the rim and the axis of rotation. The wheel is rotating with a non-zero angular acceleration. For each of the following statements select the ...
*March 21, 2012 by Miriam*

**physics**

A 747 jetliner lands and begins to slow to a stop as it moves along the runway. The mass is 3.1 105 kg, its speed is 25.5 m/s, and the net braking force is 4.24 105 N.(a) What is its speed 7.45 s later?How far has it traveled in this time?
*October 3, 2011 by john*

**CHEMISTRY**

When 0.668 L of Ar at 1.20 atm and 227°C is mixed with 0.258 L of O2 at 501 torr and 127°C in a 400 mL flask at 27°C, what is the pressure in the flask? Pressure is given for both, am I supposed to use v1p1/t1 = v2p2/t2? Some reason this really doesn't make sense to me. Help ...
*July 5, 2010 by Casey*

**Physics**

A. Consider the motion of a projectile. It is fired at t= 0. Its initial speed is 12 m/s and its initial projection angle is 50◦ from the horizontal. The acceleration of gravity is 9.8 m/s^2. What is the maximum height,h, of its trajectory? Answer in units of m. B. ...
*February 19, 2014 by Fabricus*

**math**

Ads not by this Site For numbers 10-13 find 2 pairs of numbers with the given number as their least common multiple. 10. 10 11. 36 12. 60 13. 105
*September 26, 2013 by Shohanur*

**Fluid Mechanics**

The components and their dimensions of a hydraulic jack are shown in the figure. The specific gravity of the fluid in the jack is SG=0.8. A force F=400 N is applied at the left end of the handle, which is hinged at the right end. Determine: (a) The fluid pressure p1 on the ...
*June 11, 2012 by Bob*

**Science (planets/gravity)**

What keeps all the planets the big ones and the small ones in orbit in our big solar system? A.The gravity from the sun. B.The gravity from the moon. C.The gravity between all the planets. D.The gravity from the beautiful our earth. What do all the planets orbit around? the ...
*April 18, 2007 by Hot stuff*

**physics problem!**

The spring constant of a toy dart gun is 4442 N/m. To!@#$%^& the gun the spring is compressed 1.5 cm. The 8 g dart, fired straight upward, reaches a maximum height of 26 m. The acceleration of gravity is 9.81 Determine the magnitude of the energy dissipated by air friction ...
*March 1, 2007 by kitt*

**Science**

You weigh yourself at the top of a high mountain and the scale reads 720N. If your mass is 75K, what is the acceleration of gravity at your location?
*March 24, 2008 by Jennifer*

**Physics**

A projectile is fired straight up at a speed of 16 m/s. How long does it take to reach the top of its motion? The acceleration of gravity is 9.8 m/s2 . Answer in units of s.
*January 10, 2011 by Michael*

**Physics**

An object is in free fall. At one instant, it is traveling at 41 m/s. Exactly 3.2 s later, what is its speed? The acceleration of gravity is 9.8 m/s2 . Answer in units of m/s
*September 7, 2011 by kelsey*

**physics**

If a seagull flies to a height of 22.5 meters, how long will the clam take to fall? The acceleration of gravity is 9.8m/s. answer in units of sec
*October 17, 2012 by cassandra*

**Chemistry (PLEASE HELP ME)**

1. According to the phase diagram for water, how is the state of water determined? a. proceed up a vertical line at any given temperature b. read the phase at the intersection of any given temperature and pressure c. at a given pressure, proceed horizontally to the S-L or L-G...
*October 13, 2011 by Angel*

**Physics**

In the figure below, a small block of mass m = 0.034 kg can slide along the frictionless loop-the-loop, with loop radius 8 cm. The block is released from rest at point P, at height h = 7R above the bottom of the loop. (For all parts, answer using g for the acceleration due to ...
*February 27, 2013 by Rachel*

**physics**

(a)If the wind blows at 30m/s over the roof of your house, what is the pressure difference at the roof between the inside and outside air (b) What net force does this pressure difference produce on a roof having an area of 175m^2? I have no clue how to start. I need help with ...
*December 16, 2007 by Anonymous*

**Physics**

A sphere with a moment of inertia 0.658mr2 and mass m and radius r rolls without slipping along the track shown on a planet where the acceleration due to gravity is g. It starts from rest at a height h = 4.87R above the bottom of the circular loop of radius R. (For simplicity...
*November 2, 2012 by REEEEEEEE*

**PHYSICS**

A light inflexible cable is wrapped around a cylinder of mass m1 , radius R , and moment of inertia about the center of mass Ic . The cylinder rotates about its axis without friction. The cable does not slip on the cylinder when set in motion. The free end of the cable is ...
*November 8, 2013 by Anonymous*

**physics**

A suitcase (mass m = 15 kg) is resting on the floor of an elevator. The part of the suitcase in contact with the floor measures 0.50 m × 0.15 m. The elevator is moving upward with an acceleration of magnitude 1.00 m/s2. What pressure (in excess of atmospheric pressure) is ...
*July 18, 2010 by Anonymous*

**physics**

A particle moves in the xy plane with constant acceleration. At time zero, the particle is at x = 9 m, y =6 m, and has velocity vo =(4.5 m/s)i + (−4 m/s)j. The acceleration is given by a = (6 m/s2)i + (1 m/s2)j. What is the magnitude of the displacement from the origin (...
*September 16, 2012 by kat*

**Physics**

A cart of mass m (including the mass of the crane) has a pendulum hanging from a crane attached to the cart. There is no friction due to the normal force, u = 0, or wheel bearings of the cart wheels. The cart is experiencing and applied force to the left of 10N. The ball at ...
*October 12, 2014 by Robert*

**physics**

A batter hits a softball over a third baseman's head with speed and at an angle from the horizontal. Immediately after the ball is hit, the third baseman turns and runs at a constant velocity , for a time . He then catches the ball at the same height at which it left the bat. ...
*September 19, 2011 by Ana*

**Chemistry**

A sample of Kr gas has a volume of 465 mL at 286°C and 844 torr. When the gas is cooled by 38.3°C, its volume is reduced by 0.572 mL. What is the final pressure of the gas in kPa? the answer is supposed to be 105 but i keep getting 49.9!!!!!!
*January 19, 2008 by Matt*

**Physics(Please help)**

A gas, while expanding under isobaric conditions, does 660 J of work. The pressure of the gas is 1.40 x 105 Pa, and its initial volume is 1.70 x 10-3 m3. What is the final volume of the gas? Would I multiply the two values?
*June 21, 2012 by Hannah*

**Physics**

An airtight box, having a lid of area 12 in2, is partially evacuated. Atmospheric pressure is 15 lb/in2. A force of 108 lb is required to pull the lid off the box. The pressure in the box was:
*December 16, 2010 by Sammy*

**Physics**

An airtight box, having a lid of area 12 in2, is partially evacuated. Atmospheric pressure is 15 lb/in2. A force of 108 lb is required to pull the lid off the box. The pressure in the box was:
*December 16, 2010 by Ken*

**science**

in the year 1971. astronaut alan shepard hit a golf ball whila on the surfase of the moon. it became the longest golf shot in history alan shepard was able to hit his recod golf shot because A.the moon dods not have any gravity B.THE GRAVITY OF THE MOON IS WEAKER THAN THE ...
*November 8, 2008 by steven*

**calculus**

Find the center of gravity enclosed by y^2=4x,x=4,y=0 if its density is given by ä(x.y)=ky
*May 31, 2012 by calculs3*

**Physics/Math**

Calculate the ratio of the drag force on a passenger jet flying with a speed of 750 km/h at an altitude of 10 km to the drag force on a prop-driven transport flying at one-fifth the speed and half the altitude of the jet. At 10 km the density of air is 0.38 kg/m3 and at 5.0 km...
*February 10, 2007 by COFFEE*

**Physics Classical Mechanics**

A light inflexible cable is wrapped around a cylinder of mass m1 , radius R , and moment of inertia about the center of mass Ic . The cylinder rotates about its axis without friction. The cable does not slip on the cylinder when set in motion. The free end of the cable is ...
*November 7, 2013 by A*

**Gen Chem**

A liquid is heated from 33.96°C to 104.32°C. The vapor pressure increases from 23.54torr to 984.35torr. What is the heat of vaporization of the liquid in kJ/mol? The change in temperature is 70.36°C. Change in vapor pressure = 960.76 torr. What is the equation to find the heat...
*March 28, 2008 by Sarah H*

**science **

the moon's gravity is about one-sixth the gravity on earth. mar's gravity is about one half the gravity on earth. make a bar graph that shows your weight (95 lbs) in newtons on earth, moon, and on mars. A newton is equal to about one quarter of a pound.
*May 12, 2011 by nikki *

**pressure**

is light pressure more easy to localize than deep pressure or is the other way around What do you mean light pressure and deep pressure?
*January 21, 2007 by david*

**Physics - angular acceleration**

An object rotates about a fixed axis, and th angular position of a reference line on the object is given by THETA(t)=0.4e^2t, where THETA is in radians, and t is in seconds. [a.] what is the object's angular acceleration at t = 2 s? ..this is my work so far THETA(t) = 0.4e^((2...
*April 8, 2007 by COFFEE*

**Physics**

A 68-kg water skier is being pulled by a nylon (Young's modulus 3.7 x 109 N/m2) tow rope that is attached to a boat. The unstretched length of the rope is 15 m and its cross-section area is 1.8 x 10-5 m2. As the skier moves, a resistive force (due to the water) of magnitude ...
*November 23, 2013 by Samantha*

**Physics**

A dart gun is ﬁred while being held horizontally at a height of 1.52 m above ground level, and at rest relative to the ground. The dart from the gun travels a horizontal distance of 7.81 m. A child holds the same gun in a horizontal position while sliding down a 35.7&#...
*November 29, 2012 by Big Poppa Smurf*

**engineering**

A saturated soil sample under CU test was subjected to a confining pressure of 200 kPa with back pressure (pore pressure) of 50 kPa. What would be the value of pore pressure if the confining pressure was raised to 400 kPa without drainage? If the pore pressure parameter A is 0...
*December 4, 2013 by WYNN*

**Physics please help !**

A Goodyear blimp typically contains 4770 m3 of helium (He) at an absolute pressure of 1.10 x 105 Pa. The temperature of the helium is 274 K. What is the mass (in kg) of the helium in the blimp? You asked this twice. See my response to your later post.
*December 1, 2006 by maysam*

**chemistry**

When a sample of carbon dioxide gas is at 36 degrees and 105 kpa is heated the new pressure of the gas becomes 165kpa. Determine the new temperature. Assume volume and amount of gas remain constant.
*January 15, 2012 by jo*

**physics**

What is the pressure that is exerted by a box tjat has a dimension of 12cm long and 14cm wide and has a force of gravity on the box of 40N?
*March 25, 2014 by billy*

**Physics**

The modern Boeing 747 passenger jet airplane cruises at a speed up to 900 km/hr, at an altitude of 11,000 m. The cabin pressure is maintained equivalent to the atmospheric pressure at an altitude of 2,000 m. This is called the "cabin altitude". The pressure as a function of ...
*January 27, 2013 by Francisco*

**Physics**

a. 2 objects each of mass 200 kg and 500 kg are separated by 50 cm. Where body of mass 20 kg should be placed so that the resultant force of gravity experienced by objects equal to zero? b. launched a rocket leaving Earth. Known radius of the earth 6.4 x 10 ³ km and ...
*May 6, 2013 by steffy Jane*

**physics**

The horizontal surface on which the block of mass 5.2 kg slides is frictionless. The force of 64 N acts on the block in a horizontal direction and the force of 128 N acts on the block at an angle as shown below. 5.2 kg 128 N 60 ◦ 64 N What is the magnitude of the ...
*December 21, 2012 by Anonymous*

**Free Fall**

Thanks for the help with my previous problems. The acceleration to gravity on the moon is 1.6m/sec^2. If a rock is dropped into a crevasse, how fast it will be going just before it hits bottom 30 sec later? How far below the point of release is the bottom of the crevasse? If ...
*November 3, 2006 by Jen*

**heat**

if the absolute pressure of a gas is 550.280 kPa, its gage pressure is ? A.101.325kPa b.277.280kPa c.448.955kPa d.651.605kPa Gauge pressure - atmosphericpressure=absolute pressure where atmospheric pressure varies, but standard atmospheric pressure is 101.325kPa NEED ANSWER ...
*July 15, 2005 by Andre*

**chemistry**

How many moles of gas must be forced into a 3.1L ball to give it a gauge pressure of 9.8psi at 22degrees C? The gauge pressure is relative to atmospheric pressure. Assume that atmospheric pressure is 14.5psi so that the total pressure in the ball is 24.3psi .
*April 28, 2012 by Jess*

**chemistry**

How many moles of gas must be forced into a 3.7L ball to give it a gauge pressure of 8.4psi at 23degrees C? The gauge pressure is relative to atmospheric pressure. Assume that atmospheric pressure is 14.6psi so that the total pressure in the ball is 23.0psi
*April 28, 2012 by Jessica12*

**Physics**

What equations should I use to calculate the effective value of g, the acceleration of gravity (in meters/second^2), at 5800 km above the earth's surface?
*October 23, 2010 by Adolfo*

**physics**

A football player is running at a speed of 9m/s hits the goalpost and comes to a stop in 0.050 sec. Calculate his acceleration and compare it with that of gravity.
*September 24, 2012 by Anonymous*

**Physics **

A bullet is fired straight up from a gun with a muzzle velocity of 148 m/s. Neglecting air resistance, what will be its displacement after 6.3 s? The acceleration of gravity is 9.8 m/s2 .
*October 7, 2012 by Sophie *

**Physics**

an airplane is flying in a horizontal of radius 1.0 km what must be the speed of the plane if the pilot is to experience a centripetal acceleration three times that of gravity.
*March 8, 2013 by King*

**Physics**

A ball thrown straight up at ground level passes a height of 115.7 m in 5.6 s. The acceleration of gravity is 9.8 m/s^2. What was its initial speed? Answer in units of m/s.
*February 9, 2014 by Fabricus*

**physics**

A basketball player achieves a hang time of 0.75 s in dunking the ball. What vertical height will he attain? The acceleration of gravity is 9.8 m/s2 . Answer in units of m
*September 24, 2014 by ashlie*

**Physics**

A bullet is fired straight up from a gun with a muzzle velocity of 312 m/s. Neglecting air resistance, what will be its displacement after 1.4 s? The acceleration of gravity is 9.8 m/s 2 .
*September 28, 2014 by Elizabeth*

**physics **

A bullet is fired straight up from a gun with a muzzle velocity of 208 m/s. Neglecting air resistance, what will be its displacement after 2.6 s? The acceleration of gravity is 9.8 m/s2 .
*October 30, 2014 by chursea*

**physics**

A 244 g particle is released from rest at point A inside a smooth hemispherical bowl of ra- dius 21.7 cm, as shown in the figure The acceleration of gravity if 9.81 m/s2 .
*November 6, 2014 by Orlando*

**physics**

Here were two tricky questions. Please provide steps. Answers are not necessary (since these are practice questions for an exam). 1.) The centrifuge is a device in which a small container of material is rotated at a high speed on a circular path. Such a device is used in ...
*October 16, 2010 by jo*

**physics**

Here were two tricky questions. Please provide steps. Answers are not necessary (since these are practice questions for an exam). 1.) The centrifuge is a device in which a small container of material is rotated at a high speed on a circular path. Such a device is used in ...
*October 16, 2010 by jo*

**Physics**

Need Help with physics! Two cars drive on a straight highway. At time t = 0, car 1 passes mile marker 0 traveling due east with a speed of 17.0 m/s. At the same time, car 2 is 1.3 km east of mile marker 0 traveling at 30.0 m/s due west. Car 1 is speeding up with an ...
*October 4, 2012 by Brandon*

**Physics**

A ball is thrown vertically upward from the ground with a speed of 36.0 m/s.Suppose the acceleration of gravity were only 2.00 m/s^2 instead of 9.80 m/s^2 a)At what time does it have a velocity of 12.0 m/s upward? b)At what time does it have a velocity of 12.0 m/s downward? c)...
*September 6, 2014 by Celine*

**Chemistry**

How many moles of gas must be forced into a 4.8L tire to give it a gauge pressure of 30.8psi at 30 degrees celsius? The gauge pressure is relative to atmospheric pressure. Assume that atmospheric pressure is 14.5L so that the total pressure in the tire is 45.3psi. What formula...
*February 20, 2013 by Claire*

**physics mc question!!!!HELP **

Question # 1 : It a particle increases its speed by a factor of 2, what happens to the kinetic energy? a)doubles b)cuts in half c)increases by a factor of 4 d)depends on whether or not work is done on the particle Question # 2: An object falling near the surface of the Earth a...
*May 22, 2012 by lilly*

**chemistry**

calculate the work performed if a balloon contracts from 12.32L to 422 ml due to an extermal pressure of 3.1 atm
*December 12, 2011 by saud*

**physics**

A car speed up from 18m/s to 34 m/s in 2 seconds A) find the cars acceleration must write down all given information and show the work B) What does this acceleration tell us about the motion of the car?
*May 3, 2012 by lisa*

**Physics**

A rocket is launched at an angle of 42◦ above the horizontal with an initial speed of 76 m/s. It moves for 9 s along its initial line of motion with an acceleration of 29 m/s^2. At this time its engines fail and the rocket proceeds to move as a projectile. The ...
*September 6, 2010 by John*

**Physics**

1. The problem statement, all variables and given/known data A student pulls on a box up an incline of 10 degrees. The student pulls with a force of 180 N directed at 30 degrees above the line of the incline. The box has a mass of 28 kg, and the coefficient of friction between...
*October 7, 2007 by Tim*

**physics**

Coasting due east on your bicycle at 8.0 m/s, you encounter a sandy patch of road 7.4 m across. When you leave the sandy patch your speed has been reduced to 5.5 m/s. Assuming the bicycle slows with constant acceleration, what was its acceleration in the sandy patch? Give both...
*September 16, 2013 by john*

**precalculus**

write each expression as the sine, cosine or tangent of a double angle. then find the exact value of the expression. a. 2sin 22.5 cos 22.5 b. cos^2 105- sin^2 105
*July 6, 2012 by ama*

**physics- TEST TMRW PLS HELP!**

In zero-gravity astronaut training and equipment testing, NASA flies a KC135A aircraft along a parabolic flight path. The aircraft climbs from 24 000 ft to 31 000 ft, where it enters the zero-g parabola with a velocity of 143 m/s nose high at 45.0° and exists with velocity 143...
*October 18, 2012 by Ania *

**college chem**

A mixture contains H2 at 600 torr pressure, N2 at 200 torr pressure and O2 at 300 pressure. what is the total pressure of the gases in the system?
*April 29, 2014 by ashley*

**Math IN URGENT NEED OF FEEDBACK**

If the temperature is constant, then the atmospheric pressure P (in pounds/square inch) varies with the altitude above sea level h in accordance with the law given below where p0 is the atmospheric pressure at sea level and k is a constant. P = p0e-kh If the atmospheric ...
*April 13, 2011 by Anonymous*

**math**

Jack's yard is a rectangle 105 feet by 212 feet. Using front-end estimation on the dimensions, what is an estimate of the area of this yard?
*February 29, 2012 by kl*

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