Tuesday

August 30, 2016
Number of results: 66,997

**Physics**

A small mailbag is releassed from a helicopter that is ascending steadily at 5m/s. After 2s. a) what is the speed of the mailbag? b) how far is it below the helicopter? a) would I use v=v_0 +at v=5m/s + 9.8m/s^2(2s) v=24.6 m/s is this the correct speed of the mailbag? For b) i...
*September 19, 2007 by Tammy*

**PLEASE HELP ME!**

A 68.6-kg circus performer is fired from a cannon that is elevated at an angle of 43.6 above the horizontal. The cannon uses strong elastic bands to propel the performer, much in the same way that a slingshot fires a stone. Setting up for this stunt involves stretching the ...
*December 1, 2012 by Jessica*

**physics**

take a satalite going around the earth... what allows us to say net force (radial) = Fg = Fr = ma were the Fg is the force of gravity exerted on the satalite were Fr is radial force and ma is the mass and acceleration of the satalite ok I understand newtons second law but what...
*August 17, 2009 by physics*

**Physics**

A 10 kg crate is pulled up a rough incline with an initial speed of 1.5 m/s. The pulling force is 86 N parallel to the incline, which makes an angle of 30 with the horizontal. Assuming the coefficient of kinetic friction is 0.4 and the crate is pulled a distance of 7.5 mfind...
*January 5, 2011 by Bob*

**computers**

TMA1PHY111 ( 1.) A passenger in a moving car and a passerby standing at the road side see each other as moving in the opposite direction. Which of the following is not true?< (A) The passenger is in motion relative to the passer-by (B) The passer-by is stationery relative ...
*October 12, 2011 by lawrence*

**Physics**

forty 2.0 kg blocks 20.0 cm thick are used to make a retaining wall in a backyard. Each row of the wall will contain 10 blocks. you may assume that the first block is the reference level. How much gravitational potential energy is stored in the wall when the blocks are set in ...
*March 6, 2016 by AlphaPrimes*

**Physics: Waves in Media**

A scout troop is practicing its orienteering skills with map and compass. First they walk due east for 1.5 km. Next, they walk 32 west of north for 3.5 km. How far and in what direction must they walk to go directly back to their starting point?
*June 6, 2011 by Ryan*

**Physics**

A car is driving on a level highway. It is acted upon by the following forces: a downward gravitational force of 12 kN, an upward contact force due to the road of 12 kN, another contact force due to the road of 7 kN directed West, and a drag force due to air resistance of 5 kN...
*October 3, 2014 by HArley*

**Dynamics**

a 1500 kg automobile is traveling up to 20 degree incline at a speed of 6 m/s. if the driver wishes to stop his car in a distance of 5m, determine the frictional force at pavement which must be supplied by rear wheels
*July 30, 2012 by DHilsath*

**Dynamics**

1500 kg automobile is traveling up to 20 degree incline at a speed of 6 m/s. if the driver wishes to stop his car in a distance of 5m, determine the frictional force at pavement which must be supplied by rear wheels
*August 4, 2012 by basha*

**dynamics**

the 1500 kg automobile is travelling up the 20 degree inclined at a speed of 6 m/s , if the driver wishes to stop his car in a distance of 5m , determine the frictional force at the pavement which must be supplied by the rear wheels.
*December 30, 2012 by umesh*

**dynamics**

a 1500 kg automobile is traveling up to 20 degree incline at a speed of 6 m/s if the driver wishes to stop his car in a distance of a 5m, determine the frictional force at pavement which must be supplied by rear wheels.
*July 22, 2013 by Anonymous*

**Dynamics**

A 1500 kg automobile is traveling up to 20 degree incline at a speed of 6 m/s. If the driver wishes to stop his car in a distance of 5m,determine the frictional force at pavement which must be supplied by rear wheels.
*July 22, 2013 by Anonymous*

**Dynamics**

A 1500 kg automobile is traveling up to 20 degree incline at a speed of 6 m/s. If the driver wishes to stop his car in a distance of 5m,determine the frictional force at pavement which must be supplied by rear wheels.
*July 22, 2013 by Anonymous*

**Statistics**

Suppose that the population of weights of airline passengers has mean 150 lbs. and standard deviation 25 lbs. A certain plane has a capacity of 7,800 lbs. (a) What is the probability that a flight of 50 passengers will exceed capacity it? (b) If we wish to reduce the chance of...
*December 11, 2012 by Doe*

**Physics**

A 25 g bullet is fired from a rifle with a barrel of length 65 cm. The bullet starts from rest at one end of the barrel and experiences an average force of 1200 N due to the expanding gases as it moves down the length of the barrel. a) Calculate the work done on the bullet by ...
*November 20, 2013 by Angie*

**physics**

A 50.0-g sample of a conducting material is all that is available. The resistivity of the material is measured to be 11~ 10-8 m and the density is 7.86 g/cm3. The material is to be shaped into a solid cylindrical wire that has a total resistance of 1.5 . a) What length of...
*November 15, 2012 by Amber*

**Physics II**

A 51.0 g sample of a conducting material is all that is available. The resistivity of the material is measured to be 12 10-8 m, and the density is 7.67 g/cm3. The material is to be shaped into a solid cylindrical wire that has a total resistance of 1.5 . What length of wire ...
*March 7, 2013 by Stephanie*

**math**

mike has an average of 89 on the five tests he has taken so far this semester. what grade must mike earn on the next test to raise his average grade exactly to 90?
*May 29, 2012 by keke*

**HISTORY **

how is the size of a legislative district determined A. by geographical boundaries B. by city limits C. by the apportioned population D. by county boundaries*** 2. the term bicameral legislature refers to two of what A. chambers of the General Assembly *** B. state senators in...
*February 26, 2015 by HELP ME PLEASE*

**math**

A 26 meter guy wire is attached to an upright pole 24 meters from the ground. How far from the pole must the wire be anchored in the ground?
*January 28, 2016 by Mark*

**physics**

It has been said that sometimes lead bullets melt upon impact. Assume that a bullet with an initial temperature of 301 K receives 67.9 % of the work done on it by a wall on impact as an increase in internal energy. (The melting point of lead is 601 K, the heat of fusion for ...
*November 18, 2014 by mehmet kaya*

**potential rational zeros**

list the potential rational zeros of the polynomial function, do not find the zeros. f(x)=x^5-5x^2+4x+3
*March 13, 2010 by Paris*

**chemistry**

A chemist must dilute 55.6 ml of 1.48 M aqueous silver nitrate (AgNO3) solution until the concentration falls to 1.00M. He'll do this by adding distilled water to the solution until it reaches a certain final volume. Calculate this final volume, in milliliters. Round your ...
*August 31, 2012 by Lizzy*

**Algebra 2**

It is a beautiful spring day so you decide to go rowing upstream on your favorite river. You row at a constant rate of 1 mile per hour. Suddenly a gust of wind blows your hat off into the water. You watch it float away downstream but since you never really liked it that much, ...
*February 8, 2010 by John*

**chemistry**

upper atmosphere chloromethane can be decomposed by light according to the reaction:CH3Cl -> CH3(g) + Cl(g)The energy required for this reaction is 428 kJ mol1. If each molecule of chloromethane is decomposed by one photon, what is the maximum wavelength that photon can have?
*October 26, 2011 by el*

**Chemistry**

The heat of vaporization of benzene, C6H6, is 30.8kJ/mol at its boiling point of 80.1 degrees celsius. How much energy in the form of heat is required to vaporize 102g of benzene at its boiling point? I know that the answer is 24.2kJ but i am not sure how to get this.
*February 5, 2012 by Hannah*

**psychology**

In social psychology whats the term that describes this scenario: someone treats you in a certain way then you respond in a certain way consistent with how you were treated. however, that is the way you wanted to act.
*May 24, 2011 by tony*

**chemistry**

Calculate the energy (in kJ) required to heat 25 g of liquid water from 25oC to 100.oC and change it to steam at 100oC. The specific heat capacity of liquid water is 4.18 J/goC, and the molar heat of vaporization of water is 40.6 kJ/mol.
*February 17, 2016 by maria*

**SCIENCE HELP**

CAN SOMEONE CHECK THESE!! 1. Which of the following is a reason why a person might want to wear snowshoes if walking a distance in deep snow? (1 point) snowshoes spread the persons weight out snowshoes reduce the amount of pressure on a given spot snowshoes keep the person ...
*May 28, 2016 by gabby*

**Chemistry**

A zinc-copper battery is constructed as follows. Zn | Zn2+ (0.70 M) || Cu2+ (2.30 M) | Cu The mass of each electrode is 200. g. (a) Calculate the cell potential when this battery is first connected. 1 V (b) Calculate the cell potential after 10.0 A of current has flowed for 10...
*March 29, 2009 by Amy*

**social studies (Saudi Arabia)**

In what way is Islam most likely to impact Muslims during work days? 1)They must leave work early 2)They will not participate in leisure activities after work 3)They can not have certain jobs 4)They need to pause during their work and pry I think it is 4. Am I correct? please ...
*January 22, 2015 by Abby*

**Physics **

A rope exerts a constant horizontal force of 203N pulling a 68-kg crate across the floor. The velocity of the crate is observed to increase from 3m/s to 5m/s in a time of 4 seconds under the influence of this force and the frictional force exerted by the floor on the crate. ...
*June 21, 2013 by Tim *

**Chemistry **

A certain reaction has an activation energy 52.93 kJ/mol. At what kelvin temperature will the reaction proceed 8.00 times faster than it did at 315K? Ea = 52.93 kJ/mol = 52930J R (gas constant) = 8.314 T1 = 315K k1 = rate constant at T1 T2 = ? k2 = rate constant at k2 = 8.00 ...
*March 17, 2015 by Jessica*

**Physics**

A point charge q = -2.41 nC is initially at rest adjacent to the negative plate of a capacitor. The charge per unit area on the plates is 4.67 μC/m2 and the space between the plates is 6.53 mm. What is the potential difference between the plates? What is the kinetic ...
*February 1, 2012 by Ashley *

**Math**

What is the difference between a vertical stretch and a vertical shrink?
*October 22, 2011 by Izzy*

**Chemistry**

The isotopic abundance of naturally occurring hydrogen is as follows: 1H 99.985 atom % 2H 0.015 atom% When H2 gas is formed from naturally occurring hydrogen, what percentages of the molecules have molecular weights of approximately 2, 3 and 4?
*October 1, 2013 by Jane*

**Chemistry**

Predict the standard cell potential and calculate the standard reaction Gibbs free energy for galvanic cells having the following cell reactions: a.)3Zn + 2Bi3+ = 3Zn2+ + 2Bi b.)2H2 + O2 = 2H20 in acidic solution c.)2H2 + O2 = 2H20 in basic solution d.)3Au+ = 2Au + Au3+ I ...
*February 27, 2014 by Anonymous*

**physics**

The pendulum shown right has a mass of 0.26 kg and moves to the right from point B to point A. At point B the speed of the mass is 3.2 m/s. (i) What is the change in the gravitational potential energy in the motion from B to A? (ii) What is the mass speed at point A? (iii) If...
*March 8, 2013 by Meder*

**electromagnetic just put the rule**

In a certain material for which = 6.5 o , H = 10ax + 25ay - 40az A/m Find (a) The magnetic susceptibility xm of the material (b) The magnetic flux density (c) The magnetization, (d) The magnetic energy density I just want the rule of them
*October 31, 2014 by Ahmed*

**Chemistry**

Activation energy is____ the heat released in a reaction*** the energy barrier between reactants and products the energy given off when reactants collide generally very high for a reaction that takes place rapidly
*May 12, 2016 by Annamarie*

**physics**

You are 1.7m tall and your eyes are 8cm from the top of your head. How tall must a vertical plane mirror be to see your entire length? Also how far from the ground is the top of the mirror?
*April 28, 2008 by shan*

**Physic**

The gravitational forces of the Earth and the Moon are attractive, so there must be a point on a line joining their centers where the gravitational forces on an object cancel. How far is this distance from the Earth's center?
*May 8, 2011 by Anonymous*

**PHYSICS**

The gravitational forces of the Earth and the Moon are attractive, so there must be a point on a line joining their centers where the gravitational forces on an object cancel. How far is this distance from the Earth's center?
*March 15, 2015 by Physics*

**math**

Bob must save a total of 180 dollars for a new bike. So far he saved four fifths of the amount. How much money has Bob saved for his bike
*August 26, 2015 by kenney*

**Physics**

A single photon in empty space is converted into an positron and an electron, each with rest mass 511Mev. (a) show this transformation is not possible (dynamaically). (b)How could this transformation be made posible. (c)what is the minimum photon energy required to enable the ...
*June 12, 2011 by Forest *

**AP Biology**

We just did the Osmosis and Diffusion lab in Biology. My teacher wants us to use water potential (and its equation) to explain the results....how do I use the water potential equation?
*January 13, 2008 by Marie*

**physics**

A launching mechanism consists of an arm (uniform rod with mass 250. g and length 75.0 cm) with a holder (negligible mass) at one end mounted to a hub of radius 3.00 cm and negligible mass at the other end. A string is wrapped around the hub and passes to a spring of constant ...
*November 21, 2014 by Sham*

**trigonometry**

a motor boat moves in the direction of N 38 E for 3 hrs at 20 mph. How far north and how far east does it travel?
*January 3, 2015 by rica*

**Physics**

This is a very confusing question and I have no idea how to tackle it. - In a nuclear reactor, neutrons released by nuclear fission must be slowed down before they can trigger additional reactions in other nuclei. To see what sort of material is most effective in slowing (or ...
*October 30, 2009 by Sal*

**Physics**

How can you explain work, in regards to electricity? I understand it as the product of energy used, usually displacement. I cant understand or explain it as far as electricity is concerned. I'm not sure if I understand it at all.
*June 19, 2016 by Steve*

**Physics**

A car with a mass of 1380 kg is moving around a curve with a radius of 50 m at a constant speed of 25 m/s (about 56 MPH). (a) What is the centripetal acceleration of the car? 1 m/s2 (b) What is the magnitude of the force required to produce this centripetal acceleration? 2 N
*February 22, 2012 by Mina*

**physics **

car with a mass of 1280 kg is moving around a curve with a radius of 50 m at a constant speed of 10 m/s (about 22 MPH). (a) What is the centripetal acceleration of the car? (b) What is the magnitude of the force required to produce this centripetal acceleration
*March 31, 2014 by candi gonzalez*

**algebra 1 question please help**

You use a line of best fit for a set of data to make a prediction about an unknown value. The correlation coefficient for your data set is -0.015. How confident can you be that your predicted value will be reasonably close to the actual value?
*March 8, 2016 by Anonymous*

**Science**

What is the force of a 2.0N force and an 3.0N force acting on an object in the same direction?
*November 9, 2010 by ced*

**physics**

A toy car is given a quick push so that it moves on an inclined ramp. After it is released, it moves up, reaches its highest point and moves back down again. Friction is so small it can be ignored. What net force acts on the car? A. net force of zero B. Net constant force up ...
*July 2, 2011 by alexa*

**Biology**

Which of the following is the balanced equation for photosynthesis in plant cells? A 3C0+ 3H0 + Energy --)-CH120 + 30 2 266 2 B. 6C0+ 6Hp + Energy--)-CHp + 60 2 616 2 C. CH0 + 30--)-3C0+ 3H0 + Energy 6126 2 2 2 D. CHp + 60--)-6C0+ 6Hp + Energy 616 2 2 I really do not know
*July 14, 2014 by Dulce*

**Physics **

A high voltage unit has an internal resistance of 50 mega ohms. On open circuit, the potential difference across its output is 3000 V. When a resistor R is connected across its output, the potential difference at the output falls to 1000 V. Calculate the resistance of R.
*February 4, 2016 by Priya*

**Math**

A ship is 24 miles east of port.how far. North must the ship sail to reach a point that is 25 miles from port?
*February 18, 2014 by Pythagorean theorem*

**physics**

A body of mass 6kg, initially moving with speed 12m/s, experiences a constant retarding force of 10 newtons for 3 seconds. Find the kinetic energy of the body at the end of this time.
*January 10, 2011 by nerd*

**physics**

A body of mass 6kg, initially moving with speed 12m/s, experiences a constant retarding force of 10 newtons for 3 seconds. Find the kinetic energy of the body at the end of this time.
*January 10, 2011 by nerd*

**physics**

A body of mass 6kg, initially moving with speed 12m/s, experiences a constant retarding force of 10 newtons for 3 seconds. Find the kinetic energy of the body at the end of this time.
*January 10, 2011 by nerd*

**physics**

A body of mass 6kg, initially moving with speed 12m/s, experiences a constant retarding force of 10 newtons for 3 seconds. Find the kinetic energy of the body at the end of this time.
*January 10, 2011 by nerd*

**physics**

A body of mass 6kg, initially moving with speed 12m/s, experiences a constant retarding force of 10 newtons for 3 seconds. Find the kinetic energy of the body at the end of this time.
*January 10, 2011 by nerd*

**physics**

A body of mass 6kg, initially moving with speed 12m/s, experiences a constant retarding force of 10 newtons for 3 seconds. Find the kinetic energy of the body at the end of this time.
*January 10, 2011 by nerd*

**Physics **

two objects move toward each other collide and separate. there was no net external force acting on the objects but some kinetic energy was lost. is momentum conserved ? what is the explanation ?
*August 16, 2013 by kate*

**physics**

The Easy Bake Oven is a common toy for young children who want to emulate the process of cooking. Suppose this oven is plugged into a 120 V electrical outlet and "cooks" the food by using a 144 ohm resistor light bulb that converts electrical energy to both light and heat ...
*May 30, 2013 by Julia*

**College Physics**

In designing rotating space stations to provide for artificial-gravity environments, one of the constraints that must be considered is motion sickness. Studies have shown that the negative effects of motion sickness begin to appear when the rotational motion is faster than ...
*October 2, 2010 by Dawn*

**English**

The actions of many of the characters in The Crucible spring from a complex web of motivations. Some of the characters later decide that they have chosen the wrong action and change their behavior. This switch is, again, often motivated by a number of factors. Compose a one-...
*June 12, 2013 by Susan*

**biology**

30. Enzymes function most efficiently at the temperature of a typical cell, which is 37 degrees Celsius. Increases or decreases in temperature can significantly lower the reaction rate. What does this suggest about the importance of temperature-regulating mechanisms in ...
*February 17, 2013 by roger*

**Social Studies**

!. how is the size of a legislative district determined A. by geographical boundaries B. by city limits *** C. by the apportioned population D. by county boundaries 2. the term bicameral legislature refers to two of what A. chambers of the General Assembly B. state senators in...
*February 20, 2015 by homework*

**Physics**

(a) What is the energy of a pendulum (L = 0.9 m, m = 0.4 kg) oscillating with an amplitude of 4.3 cm? (b) The pendulum's energy loss (due to damping) is replaced in a clock by allowing a 2.3-kg mass to drop 1.0 m in 1 week. What percentage of the pendulum's energy is lost ...
*June 25, 2012 by Ally*

**Mechanics**

What force accelerates a 3kg mass at a rate of 4m/s^2? Assuming this is on smooth surface with no frictional force Force = mass x acceleration F = 3 x 4 F = 12N If there is a frictional force will have to look at the acceleration in the opposing direction first. thanks again
*February 4, 2007 by Janine*

**Enviro Science**

4. The Earth's tectonic plates and earthquakes are related because a. most earthquakes take place at or near tectonic boundaries b. during an eruption, the plates slip past one another c. of the measure of energy released by the earthquake, called magnitude d. an earthquake ...
*April 24, 2012 by mysterychicken*

**ElectroChem**

Find the Emf for the cell Cr(gr) | Sn4+(aq, .059 M), Sn2+ (aq, .059 M) || Fe3+ (aq, .15 M), Fe2+ (aq, .015 M) | Pt(s) if the standard cell emf is .77 V at the cathode and .15 V at the anode. Answer in Units of V. If would be nice if you could show me step by step.
*February 23, 2015 by Chemstudent*

**ElectroChem**

Find the Emf for the cell Cr(gr) | Sn4+(aq, .059 M), Sn2+ (aq, .059 M) || Fe3+ (aq, .15 M), Fe2+ (aq, .015 M) | Pt(s) if the standard cell emf is .77 V at the cathode and .15 V at the anode. Answer in Units of V. If would be nice if you could show me step by step.
*February 24, 2015 by Chemstudent*

**physics (for bobpursley, or anyone)**

Hey bob, its Mike and Jake. We wanted to start over on a new foot with you. We got assignment worth over 300pts, so far we getting 80% of the questions right, which is pretty good. We are stuck on some questions. We will tell you the questions and tell you what we think and ...
*May 10, 2007 by mike*

**physics**

3 stings are attached on a ring. 2 of the strings make 70 degrees angle and each is pulled with 7.0 N . What force must be applied to keep the 3rd string to keep stationary?
*December 30, 2010 by Joseph*

**Physics**

what is the minimum amount of force that must be applied to the sled in order to start it moving? the static friction is 0.30 and the sliding coefficient is 0.10 and the total mass of the sled is 50 kg
*November 4, 2011 by Ryan*

**science**

what force must be applied to the end of a 2.0 meter long crowbar in order to lift a 500 Newton rock if the fulcrum of the bar is 0.5 meters from the rock?
*October 24, 2012 by rowena*

**Physics**

The two pistons in a hydraulic lift have radii of 2.67 cm and 20.00 cm respectively. What force must be applied to the 2.67 cm piston so that a 2.0 x 103 kg mass resting on the 20.0 cm piston is lifted?
*March 31, 2014 by Tiffani*

**Icp**

A student is helping her teacher move a 9.5 kg box of books. What net sideways force must she exert on the box to slide it across the floor so that it accelerates at 1.0 m/s2?
*February 11, 2015 by Jack*

**Physics **

Span of a bridge is 32.0m and has a mass of 5.38x10^4 kg. A truck of mass 11700kg is stopped at 11.4m from one end. Find upwards force that must be exerted by each pair
*April 5, 2016 by Sihle*

**Physics**

A box is pushed across a floor with a force of 2.8 N at an angle of 26.8 degrees above the horizontal. How much work, in Joules, must be done to move the box a distance of 8.3 m?
*April 21, 2016 by Amolica*

**Physics**

Sally applies a horizontal force of 500 N with a rope to dtag a wooden crate across a floor with a constant speed. The rope tied to the crate is pulled at an angle of 67.5 degrees. a) How much force is exerted by the rope on the crate? b) What work is done by Sally if the ...
*November 14, 2007 by Elizabeth*

**Maths / physics**

Calculate the rest mass (In grams) of an object whose rest energy is equal to the energy released by a tonne of tnt the energy liberated by 1 g of tnt = 4kJ Rest energy = moc 2 1 tonne of tnt equals 10^6 x 4kJ = 4 x 10^6 kJ x (3.0^8)sqrd = 3.6 x 10^23kJ is this right ?? i ...
*August 27, 2013 by Wayne*

**Physics**

An air rifle is used to shoot 1.0 g particles at 100 m/s through a hole of diameter 2.0 mm. How far from the rifle must an observer be to see the beam spread by 1.0 cm because of the uncertainty principle? Compare this answer with the diameter of the universe ( 1026 m).
*April 5, 2011 by Abby*

**Physics**

There are two particles of charge +Q located on the top left and bottom right corners of a square. What is the direction of the net electric field at the point on the bottom left corner of the square? And also what would be the general equation be for finding the potential ...
*March 7, 2010 by Joe*

**Physics**

I have tried to solve this problem in multiple ways, but i keep getting it wrong please help A 48.0 {\rm kg} ice skater spins about a vertical axis through her body with her arms horizontally outstretched, making 1.50 turns each second. The distance from one hand to the other ...
*March 3, 2008 by Mark*

**Chemistry **

A reaction has a standard free-energy change of 10.30 kJ mol1 (2.462 kcal mol1). Calculate the equilibrium constant at 25C.? This is what I've done so far.. ∆G= -2.3 RT + log (K) -10.31 kJ = -2.3 (.0083145)(298) + log K -10.31 kJ = -2.3 (2.48) log K log K = 10.31kJ...
*March 18, 2014 by Angely R. *

**Boston College**

Suppose that the population of weights of airline passengers has mean 150 lbs. and standard deviation 25 lbs. A certain plane has a capacity of 7,800 lbs. (a) What is the probability that a flight of 50 passengers will exceed capacity it? (b) If we wish to reduce the chance of...
*December 11, 2012 by Doe*

**Math**

I have a drawer which contains 40 socks in the following numbers and colors: 12 tan, 9 brown, 11 gray, and 8 blue. Suppose I am blindfolded. What is the fewest number of socks I must pick from the drawer to be absolutely certain that I have two socks of the same color among ...
*February 27, 2014 by Sudipta*

**physics**

A small cart weighs 15.0 N. If a constant force of 25 N is used to move the cart horizontally across the desk, A] What will be the acceleration of the cart? B]How far will the car move in 1.0 second
*December 12, 2011 by Marissa*

**physics**

Ayesha exerts a force of 186 N on a lever to raise a 2.70 103-N object to a height of 29.0 cm. If the efficiency of the lever is 83.3 percent, how far does Ayesha move her end of the lever?
*February 29, 2012 by sam*

**Physic**

A1/2 inch diameter piston moves 10 inches when 30 Lbs of force is applied, how far will it move a 6 inch Diamter piston, and how much weight will this piston lift?
*October 12, 2014 by Tonya*

**Physic**

A 1/2 inch diameter piston moves 10 inches when 30 Lbs of force is applied how far will it move a 6 inch diamter piston and how much weight will this piston lift.
*October 13, 2014 by Ann*

**Physics - Second Law Question**

A large raindrop falling a cloud is acted on by a gravitational force of 4.9 x 10^-3 N directed downward and a force of air resistance of 4.5 x 10^-3 N directed upward. What is the net force on the raindrop? What is the direction of the net force? Thank you so much!
*October 15, 2014 by Tom*

**physics**

The average rate at which energy is conducted outward through the ground surface in a certain region is 51.6 mW/m2, and the average thermal conductivity of the near-surface rocks is 3.31 W/mK. Assuming a surface temperature of 11.7C, find the temperature (in Celsius) at a ...
*April 14, 2011 by tim*

**physics**

The average rate at which energy is conducted outward through the ground surface in a certain region is 66.8 mW/m2, and the average thermal conductivity of the near-surface rocks is 2.13 W/mK. Assuming a surface temperature of 8.01C, find the temperature (in Celsius) at a ...
*April 1, 2013 by Ashley*

**HELP Physics**

The average rate at which energy is conducted outward through the ground surface in a certain region is 30.9 mW/m2, and the average thermal conductivity of the near-surface rocks is 3.11 W/mK. Assuming a surface temperature of 9.48C, find the temperature (in Celsius) at a ...
*April 12, 2013 by Shane*