Thursday

June 30, 2016
Number of results: 66,535

**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 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*

**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 *

**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*

**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**

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*

**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*

**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*

**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*

**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*

**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*

**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 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*

**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*

**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*

**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*

**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*

**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*

**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*

**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*

**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*

**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**

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**

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**

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*

**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*

**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*

**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*

**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**

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/m·K. Assuming a surface temperature of 11.7°C, 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/m·K. Assuming a surface temperature of 8.01°C, 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/m·K. Assuming a surface temperature of 9.48°C, find the temperature (in Celsius) at a ...
*April 12, 2013 by Shane*

**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**

A 747 jetliner lands and begins to slow to a stop as it moves along the runway. If its mass is 3.42×105 kg ,its speed is 29.5 m/s,and the net braking force is 4.3*10^5 N. What is its speed 8.33 s later? How far has it traveled in this time? How exactly do I do this? What ...
*September 15, 2009 by Mike Rusho*

**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*

**chemistry**

3. For the reaction between Cu and Sn the potentials are given below; Cu2+(aq) +2e- -----------> Cu(s) Eºcathode = 0.34 (half-cell potential) Sn(s) -----------> Sn2+(aq) + 2 e- Eºanode = - 0.14 (half-cell potential) Calculate the E.M.F (Voltage) of the cell Calculate pH ...
*March 9, 2016 by bliss*

**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*

**Chemistry **

A reaction has a standard free-energy change of –10.30 kJ mol–1 (–2.462 kcal mol–1). Calculate the equilibrium constant at 25ºC.? This is what I've done so far.. ∆Gº= -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. *

**Physics**

As a traffic light turns green, a waiting car starts with a constant acceleration of 6.0 m/s^2.At the instant the car begins to accelerate, a truck with a constant velcoity of 21 m/s pass in the next lane. (a) How far will the car travel before it overtakes the truck? (b) How ...
*April 17, 2009 by Lena*

**science**

If Wire A has a poterntial difference of 50V across it and carries a current of 2A. Wire B has a potential difference of 100V across it and also carries a current of 2A. Compare the resistances, rate of flow of charge, and rate of flow of energy in the two wires?
*October 30, 2012 by ann*

**Econnomics**

Historically, officials from 23 northeastern colleges with selective admissions policies and high tuition met each spring to compare financial aid packages for more than 10,000 common applicants. The meetings, known as “Overlap”, were designed to eliminate any differences in ...
*February 28, 2012 by jon*

**Resume(English)**

is it okay to stretch the truth or "pad" ur resume? -only if ur applying to work for governement -yes -no -sometimes would it be No?
*January 25, 2011 by Anonymous*

**physic**

A 5.0-kg object is supported by an aluminum wire of length 2.1m and diameter 1.7mm . Part A How much will the wire stretch?
*April 10, 2014 by bety*

**Physics**

An 8 kg mass is supported by an aluminum wire of length 80 cm abd diameter 2.0mm. How much will the wire stretch?
*September 23, 2015 by Grace*

**Physics**

An 8 kg mass is supported by an aluminum wire of length 80 cm abd diameter 2.0mm. How much will the wire stretch?
*September 24, 2015 by Grace*

**Physics**

You are an artillery offcer attached to Gaius Julius Caesar's Xth Legion in the Gallic War (1st C. BCE). You are responsible for a catapult, a device with a long spoonlike arm used to lob stones or pumpkins over the walls of Gallic oppida. These fortresses are protected by ...
*February 10, 2011 by Roberto*

**Physics**

You are an artillery offcer attached to Gaius Julius Caesar's Xth Legion in the Gallic War (1st C. BCE). You are responsible for a catapult, a device with a long spoonlike arm used to lob stones or pumpkins over the walls of Gallic oppida. These fortresses are protected by ...
*February 11, 2011 by Roberto*

**Physics**

You are an artillery offcer attached to Gaius Julius Caesar's Xth Legion in the Gallic War (1st C. BCE). You are responsible for a catapult, a device with a long spoonlike arm used to lob stones or pumpkins over the walls of Gallic oppida. These fortresses are protected by ...
*February 11, 2011 by Roberto*

**Physics**

You are an artillery offcer attached to Gaius Julius Caesar's Xth Legion in the Gallic War (1st C. BCE). You are responsible for a catapult, a device with a long spoonlike arm used to lob stones or pumpkins over the walls of Gallic oppida. These fortresses are protected by ...
*February 12, 2011 by Roberto*

**Check my answers please- Physics**

What is an equilibrant? (Points : 1) an object that has zero net force acting on it two chemical reactions proceeding at the same rate in opposite directions a force that makes the net force on an object zero a force in the same direction as the net force <-- Question 2. 2...
*November 18, 2013 by Gynelli*

**the big idea of energy**

i have to do an assesment about sound. i have to include the big idea of energy. i have no clue what it is! HHEELLPP MMEE!! What do you mean when you say "the big idea of energy"? I know that sound is created by vibrations, but I'm not sure thats exactly what you are looking ...
*December 5, 2006 by Anon*

**physics**

With brakes fully applied, a 1660 kg car decelerates from a speed of 74.0 km/hr. What is the work done by the braking force in bringing the car to a stop? What is the change in the kinetic energy of the car?
*February 17, 2012 by Katie*

**physics**

With brakes fully applied, a 1660 kg car decelerates from a speed of 74.0 km/hr. What is the work done by the braking force in bringing the car to a stop? What is the change in the kinetic energy of the car?
*February 20, 2012 by Katie*

**home work**

The trip scheduled for Mexico during spring break has been cancelled due to the bankruptcy of the bus company. You must tell 25 of your classmates that the trip has been cancelled and that they have lost their $100 deposit. How will you convey the information and still uphold ...
*September 2, 2006 by Anonymous*

**chemisry.Electrochemical Measurement of Concentrat**

A calibration curve to show how the cell potential varies with [Cu2+] may be constructed. A plot of cell potential (in V, with the same sense as in question 1) versus log10[Cu2+] should yield a straight line. What is the slope of this line? The answer should be -0.0591/2 but ...
*April 9, 2012 by Mahtab*

**Physics**

A 4 kg block resting on a horizontal surface is attached to an 8 kg block that hangs freely by a cord passing over a frictionless pulley. The coefficient of kinetic friction between the block and the horizontal surface is 0.4. Find the acceleration of the blocks and the ...
*November 18, 2006 by Vv*

**Mathematical Methods**

Following completion of your readings, complete exercises 35 and 37 in the “Real World Applications” section on page 230 of Mathematics in Our World. For each exercise, specify whether it involves an arithmetic sequence or a geometric sequence and use the proper formulas where...
*March 22, 2011 by John*

**physics**

A 130 cm length of string has a mass of 3.94 g. It is stretched with a tension of 8.60 N between fixed supports. What is the wave speed for this string?
*February 1, 2015 by hayley*

**physics**

an ice skater spins about a vertical axis at an angular speed of 15 rad/s when her arms are outstreched . she then quickly pulls her arms into her sides in a very small time interval so that the frictional force due to ice are negligible.her initial moment of inertia about the...
*February 11, 2012 by ashely*

**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 while it moves upward after it is released? a. Force of zero b. ...
*June 30, 2013 by Jill*

**physics**

A 60 kg student does 60 push ups in 40s . With each push up , the student must lift 70% of the body mass a height of 40cm off the floor. Assuming two significant digits, calculate the following The work the student does against a force of gravity for each push up , assuming ...
*April 25, 2012 by Melissa*

**physical**

a boy pushes a shopping trolley weight due to gravity of 150n with a constant force of 75n.a constant force of 20n is present.draw labeled force diagram to identify all the force acting on the shopping trolley.
*February 25, 2015 by bongani*

**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*

**physics**

A 747 jetliner lands and begins to slow to a stop as it moves along the runway. If its mass is 3.5 x 10 exponent 5 kg, its speed is 27.0 m/s and the net braking force is 4.30 x 10 exponent 5 N, (A) what id its speed 7.50 s later? (b) how far has it traveled in this time?
*November 1, 2011 by anna*

**chemistry**

calculate the energy required to raise the temp. of 170.0 g of silver (specific heat = .24 joules/celsius times grams) from 273K to 301K. I know the equation and I got 1142.4 joules but need to get to 2 sig figs, so I converted it to 1.1 x 10^4 which is right, but it doesn't ...
*November 6, 2007 by Avonlea*

**physics**

A motor car in rectilinear motion steadily decelerates to rest in 20s.Using Newton's second law of motion,explain why a higher force is required to stop the car in 10s than in 20s.
*November 8, 2011 by Marnal*

**physics**

A 5.05kg sits on a ramp that is inclined at 36.5 degrees above horizontal.The coefficient of kinetic friction between box and ramp is mu k= 0.25. What horizontal force is required to move the box up the incline with a constsant acceleration of 4.3m/s^2?
*March 15, 2013 by Anonymous*

**physics**

An inclined plane rises to aheight of 2 m over adistance of 6 m. Calculate: 1.The ange of the slope 2.The VR (and so IMA) of the inclined plane. 3The theoretical force required to push an object with a mass of 200 Kg up the slope.
*March 5, 2015 by Yared moges*

**physics**

A person pushes a 10 kg box from rest and accelerates it to a speed of 3.2 m/s with a constant force. If the box is pushed for a time of 2.6 s, what is the force exerted by the person? force*time=mass*changeinvelocity solve for force.
*December 16, 2006 by mel*

**Physics - Second Law Question**

the space shuttle engines cause an upward force of 3 x 10 ^5 N to act on the shuttle. gravity pulls down on the shuttle with a force of 1.96 x 10^5 N. what is the net force on the shuttle? what is the direction of the net force?
*October 15, 2014 by Tom*

**Math**

A warranty identification number for a certain product consists of a letter of the alphabet followed by a seven-digit number. How many possible identification numbers are there if the first digit of the seven-digit number must be nonzero?
*April 3, 2012 by Chris*

**Science (big idea of energy)**

What is the big idea of energy????? It says : for level 6: "Explained the reaction using the big idea of energy" what does it mean by the big idea of energy????
*October 1, 2007 by person*

**Physics**

The energy of the nth excited state of a hydrogen atom is proportional to 100 - (100/n2). 1) Using this formula, calculate the energy of the first five energy states. 2) How many spectral lines are possible for the transition of a photon in the n= 5 state to ground?
*April 14, 2008 by CGUFF*

**physics**

at what angle must the two forces of 50 newton and 120 newton be acting so as to balanced by a force of 130 newton?
*May 22, 2012 by anupriya*

**physics**

A sled with a weight of 200N is being pulled from rest by a force of 40 N across ice which has a coefficient of kinetic friction of ,070. If air resistance is negligible, find the acceleration of the sled. How far will the sled slide in 6 Sec?
*September 15, 2010 by K. Polska *

**Physics**

Joan comes across a deep ravine. She was planning on this as she packed a 3.8 m portable telescoping extension ladder. It has a mass of 15 kg. She was told that in order to get to the skull’s last known location, she must get across this 2 m gap. --- | \3.8m | \ __|_2m\____ (...
*November 26, 2015 by Lilly *

**Math**

green park is adding 236 plants this spring. One hundred fifty of them will flower. The rest will not flower. Use this information to answer question. 1) 1/3 of the flowering plants will have yellow flowers and 1/4 of the flowering plants will have white flowers. What fraction...
*February 26, 2015 by Cheryl H.*

**physics**

a sluice gate consists of a quadriant of a circle of radius 1.5m pivoted at its center 0. When the water is level with the gate, calculate the magnitude and direction of the resultant hydrostatic force on the gate and the moment required to open the gate.The width of the gate ...
*January 13, 2016 by shu*

**Physics -Impulse-**

1.)A 0.5 kg hockey puck moving at 35 m/s hits a straw bale, stopping in 1 s. a) What impulse is delivered to the ball? b) What force is exerted on the puck? 2.) A racing car with a mass of 1400 kg hits a slick spot and crashes head-on into a concrete wall at 50 m/s, coming to ...
*February 24, 2013 by Isis*

**mechanics**

A man begins to climb up a 12-ft ladder . The man has mass 80 kg, while the ladder has mass 10 kg. The wall against which the ladder rests is very smooth, which means that the tangential (vertical) component of force at the contact between ladder and wall is negligible. The ...
*December 6, 2015 by sana*

**physics**

A force of 1.35 newtons is required to accelerate a book by 1.5 meters/second2 along a frictionless surface. What is the mass of the book? 0.45 kilograms 0.90 kilograms 1.35 kilograms 1.5 kilograms 1.8 kilograms
*October 27, 2014 by jerome rice*