Tuesday

May 26, 2015

May 26, 2015

Total # Posts: 1,009

**Physics**

A car (mass = 1080 kg) is traveling at 25.4 m/s when it collides head-on with a sport utility vehicle (mass = 2750 kg) traveling in the opposite direction. In the collision, the two vehicles come to a halt. At what speed was the sport utility vehicle traveling?
*January 2, 2013*

**Physics**

A 48.8-kg skater is standing at rest in front of a wall. By pushing against the wall she propels herself backward with a velocity of -1.88 m/s. Her hands are in contact with the wall for 0.763 s. Ignore friction and wind resistance. Find the average force she exerts on the ...
*January 2, 2013*

**math**

mike runs for 5 of an hour at a speed of 7.5 km/h and cycles for 15 minutes at 12 km/h.how far does he go
*December 25, 2012*

**math**

Thank You Ms Sue i understand to finish rest of the proublems!
*December 11, 2012*

**math**

find the range of the following sets of numbers: 247, 562, 498, 149, 568, 327, and 470.
*December 11, 2012*

**Writing**

What is the predicate of this sentence,Henry and Mudge hear something.Is hear something the predicate
*December 11, 2012*

**Physics**

An ice skater of mass m is given a shove on a frozen pond. After the shove she has a speed of 2m/s. Assuming that the only horizontal force that acts on her is a slight frictional force between the blades of the skates and the ice: a.) Identify the horizontal force and two ...
*December 9, 2012*

**Physics**

An object of mass .550kg is lifted from the floor to a height of 3.5m at a constant speed. If the object is released from rest after it is lifted, what is its kinetic energy just before it hits the floor? What is its velocity? Show your work and units.
*December 9, 2012*

**Physics**

Two objects of different mass start from rest, are pulled by the same magnitude net force, and are moved through the same distance. The work done on object A is 500J. After the force pulled each object, object A moves twice as fast as object B. Answer the following: a.) How ...
*December 9, 2012*

**Physics**

Thank You
*December 9, 2012*

**Physics**

An object of mass .550kg is lifted from the floor to a height of 3.5m at a constant speed. How much work is done by the lifting force (include units)? b.) How much work is done by the Earth on the object? c.) What is the net work done on the object? d.) What is the change in ...
*December 9, 2012*

**math**

multiply the fraction 9/15 by the fraction 30/72 and reduce your answer to the lowest terms
*December 9, 2012*

**math**

convert the mixed number 14 5/7 to a mixed decimal. round to the nearest hundreth
*December 8, 2012*

**math**

divid the fraction 14/27 by the fraction 2/3 and reduce your answe to the lowest terms
*December 8, 2012*

**math**

find the value of G in the equation G/5-13=42
*December 8, 2012*

**Algebra II**

Factor: 12x^2+13x-35 I need help on how you would go about doing this. I only understand when 1 is the coefficient for the x^2 term.
*December 5, 2012*

**Physics**

A race car travels 110 m/s around a circular track of radius 197 m. The track is banked at 22 degrees from the horizontal with a friction constant of 0.14. What is the magnitude of the resultant force on the 2800 kg driver and his car of the car does not slip?
*December 4, 2012*

**math**

A family drives 600 miles in 2 days. The second day they drive 120 miles less than the first day How many miles did they drive the first day?
*December 2, 2012*

**Physics**

A 10 ohm resistor is connected in series with a 15 ohm resistor. If this circuit is connected to a 9 volt battery, what will be the resultant current?
*November 29, 2012*

**Algebra II**

When I have (2x)^2 2x on the paper the 2x to the right is right after the squared. So its (((2x) squared 2x) squared 2x) squared
*November 28, 2012*

**Algebra II**

How would you go about doing this problem? I've tried and with the answer given I still can't figure it out. If anyone could explain it would be greatly appreciated! (((2x)^2 2x)^2 2x)^2
*November 28, 2012*

**Math (5th grade )**

Kathy's mom has made a batch of lemon bars. Her treats are in a rectangular pan that measures 12" x 8". She will cut a vertical and horizontal live every 2 inches along the length and width of the pan. How many bars will each person receive
*November 27, 2012*

**Physics**

Carrying household appliances can be very difficult due to the weight and size. Some movers place the appliance on a dolly and move it around, however this can cause damage to floors, and it also does not work on stairs. A new technique is to utilize moving straps. These allow...
*November 25, 2012*

**Physics**

You are the designer of a school bus and would like to know what the maximum stopping distance is that will ensure the students to remain in their seats. The coefficient of static friction for the passenger and the bus seat is .5, and the coefficient of kinetic friction for ...
*November 25, 2012*

**Physics**

Two people push on a box that has a mass of 10kg, the person on the right has a mass of 86kg and applies a horizontal force of 50N. The person on the left has a mass of 45kg. The coefficient of kinetic friction between the box and the floor is .2, the coefficient of static ...
*November 25, 2012*

**Physics**

Two blocks, (Mass of block 1 = 2.3kg, Mass of block 2 = 1.2kg), are in contact on a frictionless table. If a horizontal force of 3.2N is applied to the larger block, what is the acceleration of the smaller block. Describe all external forces that are acting on the two blocks
*November 25, 2012*

**Physics **

You have setup an experiment with two 50g masses attached to strings that are connected on opposite sides of a scale that measures weight in Newtons. a.) What is the reading on the scale? b.) The whole system is now moving to the left at a speed of 10m/s. What is the reading ...
*November 25, 2012*

**Physics**

Two blocks, (Mass of block 1 = 2.3kg, Mass of block 2 = 1.2kg), are in contact on a frictionless table. If a horizontal force of 3.2N is applied to the larger block, what is the acceleration of the smaller block. Describe all external forces that are acting on the two blocks
*November 25, 2012*

**Physics**

Two people push on a box that has a mass of 10kg, the person on the right has a mass of 86kg and applies a horizontal force of 50N. The person on the left has a mass of 45kg. The coefficient of kinetic friction between the box and the floor is .2, the coefficient of static ...
*November 25, 2012*

**Physics**

You are the designer of a school bus and would like to know what the maximum stopping distance is that will ensure the students to remain in their seats. The coefficient of static friction for the passenger and the bus seat is .5, and the coefficient of kinetic friction for ...
*November 25, 2012*

**Physics**

Anyone?
*November 25, 2012*

**Physics **

Carrying household appliances can be very difficult due to the weight and size. Some movers place the appliance on a dolly and move it around, however this can cause damage to floors, and it also does not work on stairs. A new technique is to utilize moving straps. These allow...
*November 25, 2012*

**Physics**

Police examine the scene of an accident involving two cars, which is parked. The skid marks of the moving car, which nearly came to a stop before the collision, is 80 meters long. The coefficient of kinetic friction between rubber and the pavement is about .80. Estimate the ...
*November 25, 2012*

**Math Ms. Sue**

What is the slope of the line that passes through (-12.5,3.2)(-15.5,-7.2)? I think the answer is: -10.4/-3.5. Not sure on this one
*November 19, 2012*

**Math Ms. Sue**

What is the slope of the line that passes through (3/5,-2)(-6,2/9)? I don't even have a good guess at this one. Thanks.
*November 19, 2012*

**Math Ms. Sue**

What is the slope of the line that passes through (3/5,-2)(-6,2/9)? I don't even have a good guess at this one. Thanks.
*November 19, 2012*

**Math**

What is the slope of the line that passes through (3/5,-2)(-6,2/9)? I don't even have a good guess at this one. Thanks.
*November 19, 2012*

**Math Ms. sue**

What is the slope of the line that passes through (-12.5,3.2)(-15.5,-7.2)? I think the answer is: -10.4/-3.5. Not sure on this one.
*November 19, 2012*

**Math **

What is the slope of the line that passes through (-12.5,3.2)(-15.5,-7.2)? I think the answer is: -10.4/-3.5. Not sure on this one.
*November 19, 2012*

**Math Ms. sue**

What is the slope of the line that passes through (5,8)(17,2)? I think the answer is: -1/2 (1 over 2)
*November 19, 2012*

**Math**

What is the slope of the line that passes through (5,8)(17,2)? I think the answer is: -1/2 (1 over 2)
*November 19, 2012*

**calculus**

okay i need to find the derivative of f(x)=cosπ(x^2) and if you could show steps it would be GREATLY appreciated. thank you so much!
*November 14, 2012*

**calculus**

Hey, thank you so much! you did help! the second is x squared.. sorry for no being clear
*November 13, 2012*

**calculus**

okay i need to find the derivative of f(x)=πsin2x and f(x)=cosπx^2 ---------------- π is pi and if you could show steps it would be GREATLY appreciated. thank you so much!
*November 13, 2012*

**Physics**

Traveling at a speed of 20.0 m/s, the driver of an automobile suddenly locks the wheels by slamming on the brakes. The coefficient of kinetic friction between the tires and the road is 0.540. What is the speed of the automobile after 1.11 s have elapsed? Ignore the effects of ...
*November 13, 2012*

**Physics**

A 96.6-kg person stands on a scale in an elevator. What is the apparent weight when the elevator is (a) accelerating upward with an acceleration of 1.79 m/s2, (b) moving upward at a constant speed, and (c) accelerating downward with an acceleration of 1.14 m/s2?
*November 13, 2012*

**Physics**

An airplane has a mass of 2.04 × 104 kg and takes off under the influence of a constant net force of 2.18 × 104 N. What is the net force that acts on the plane's 86.0-kg pilot?
*November 13, 2012*

**Math**

How do I begin to simplify this? 3x/(4x-5y)=6ay-14b
*November 12, 2012*

**Physics**

Object A is moving due east, while object B is moving due north. They collide and stick together in a completely inelastic collision. Momentum is conserved. Object A has a mass of mA = 17.9 kg and an initial velocity of = 8.82 m/s, due east. Object B, however, has a mass of mB...
*November 4, 2012*

**math**

If half the batch of 6,000 vials are contaminated, what is the probability of finding no contaminated vials if only two vials are selected from the total amount produced?
*November 1, 2012*

**physical**

You are on a train that is traveling at 3.0 m/s along a level straight track. Very near and parallel to the track is a wall that slopes upward at a 12° angle with the horizontal. As you face the window ( 0.715 m high, 2.29 m wide) in your compartment, the train is moving ...
*October 28, 2012*

**Physics**

The drawing shows two frictionless inclines that begin at ground level (h = 0 m) and slope upward at the same angle θ. One track is longer than the other, however. Identical blocks are projected up each track with the same initial speed v0. On the longer track the block ...
*October 28, 2012*

**Physics**

The drawing shows two frictionless inclines that begin at ground level (h = 0 m) and slope upward at the same angle θ. One track is longer than the other, however. Identical blocks are projected up each track with the same initial speed v0. On the longer track the block ...
*October 24, 2012*

**chemistry**

A 25.00 mL solution of potassium nitrate (KNO3) was diluted to 125.0 mL, and 25.00 mL of this solution were then diluted to 1.000 103 mL. The concentration of the final solution is 0.00421 M. Calculate the concentration of the original solution.
*October 1, 2012*

**Physics**

A man in an elevator is 79kg. The elevator itself is 860kg. As the elevator begins to move down, a scale the man is standing on reads 437N. How do I determine the acceleration of the elevator? (I tried dividing the force of the man by his mass, it was incorrect)
*September 27, 2012*

**Grade 11 Math**

Here's the question: You are attending a very loud concert. To avoid permanent ear damage, you decide to move farther from the stage. Sound intensity is given by the formula: I = k/d squared K= constant D = distance from the listener to the source of sound. Determine an ...
*September 25, 2012*

**pre algebra**

What is the rule for this pattern? 1,negative 2,4, negative 5,7,negative8. Thanks
*September 23, 2012*

**math**

Radius of a circle with a sector area of 3 square ft determined by a central angle 1/4 radian
*August 27, 2012*

**math**

complete the square 16x-12y=4y^2+1
*August 25, 2012*

**Math add a bit of clarity**

The * is showing a multiplication sign. The number before / is the numerator and after is the denominator. This has to do with proportions and cross products but I am not understanding the rules/principles here.
*August 25, 2012*

**Math**

Given the formula Xc=1/6.28fC, find C if Xc =500 and f=2000. What are the rules that take me from 500/1 = 1/6.28*2000*C to the next step of: C=1*1/500*6.28*2000 ?
*August 25, 2012*

**Calculus**

Is the answer 2.25 v
*August 21, 2012*

**Calculus**

A 15.2-F capacitor has an initial voltage of 2.00 V. It is charged with a current given by i=tã5=t^2. Find the voltage across the capacitor at 1.75 seconds.
*August 21, 2012*

**Math**

I think the answer is 2.25V.
*August 21, 2012*

**English**

You've been assigned to invite a group of mechanical engineering professors to tour your facility. What type of language should you use in the invitation?
*August 3, 2012*

**geometry**

how do you find the perimeter of a triangle, longest side is 48cm, line down the middle is 8 and the sides are both 10.
*July 25, 2012*

**Math Gr12 (advanced functions)**

A tower that is 65m high makes an obtuse angle with the ground. The vertical distance from the top of the tower to the ground is 59m. What obtuse angle does the tower make with the ground?
*July 16, 2012*

**Chemistry**

Sorry, if I wasn't very clear. I've tried both acid and HCl for the 1st blank and borax and base for the 2nd blank, but still wrong. end point is right though!
*July 5, 2012*

**Chemistry **

This is a lab called Enthalpy and Entropy of Borax Dissolution and I just can't seem to get the right answers... Please help me fill in the blanks The _____ (acid/HCl?)is placed in the buret and the ____ (base/borax?) is placed in the flask beneath the buret. For this ...
*July 5, 2012*

**Physics**

which has the greater average speed: a car that travels from milepost 35 to milepost 40 in 5 minutes, or one that travels from milepost 68 to milepost 78 in 10 minutes?
*July 1, 2012*

**algebra**

Bob had three 10' lengths of conduit. If he used a total of 13.75' of conduit to install a motor, how much total conduit does he have left?
*June 28, 2012*

**physics**

A comet orbits the Sun with a period of 72.8 yr. (a) Find the semimajor axis of the orbit of the comet in astronomical units (1 AU is equal to the semimajor axis of the Earth's orbit). (b) If the comet is 0.55 AU from the Sun at perihelion, what is its maximum distance ...
*June 28, 2012*

**Physics**

I'm supposed to get 3.21e-07 N.
*June 26, 2012*

**Physics**

A carefully designed experiment can measure the gravitational force between masses of 9 kg. Given that the density of iron is 7860 kg/m3, what is the gravitational force between two 9.00-kg iron spheres that are touching in N?
*June 26, 2012*

**physics**

I see, so that's where I messed up. Thank you once again. I get 85.3 N now.
*June 22, 2012*

**physics**

Does θ equal 0.5981 degree and W equal 1.58 m? This is what I'm doing to solve for tension: 1) 1.13T=mg(W/2)cos(θ) 2) 1.13T=(20.8)(9.81) x (1.58/2cos(0.5981)) 3) 1.13T= 1.61.1891373 4) T= 142.6452543 = 143 N Am I calculating something wrong? Am I solving for the ...
*June 22, 2012*

**physics**

Yes. However, I think I hit a wrong number on my calculator before. I still get around 142.6, though.
*June 22, 2012*

**physics**

Sorry I let my friend use my laptop and he must have typed in his into Jiskha. It's still Tim. Sorry for the confusion.
*June 22, 2012*

**physics**

I'm also confused as to why the angle θ is 0.5981. I thought I had to use arctan(1.13/141) which gives me a 38.9 degree angle.
*June 22, 2012*

**physics**

When I try balancing the forces, I end up with T = mg, which gives me an answer which is over twice the correct answer.
*June 22, 2012*

**physics**

A trapdoor on a stage has a mass of 20.8 kg and a width of 1.58 m (hinge side to handle side). The door can be treated as having uniform thickness and density. A small handle on the door is 1.41 m away from the hinge side. A rope is tied to the handle and used to raise the ...
*June 22, 2012*

**Physics**

I was able to figure this one out with a related question. Thank you!
*June 19, 2012*

**Physics**

A thin uniform rod (length = 1.3 m, mass = 3.2 kg) is pivoted about a horizontal frictionless pin through one of its ends. The moment of inertia of the rod through this axis is (1/3)mL2. The rod is released when it is 50° below the horizontal. What is the angular ...
*June 19, 2012*

**Trigonometry**

When viewing Angel Falls (the world's highest waterfall) from Observation Platform A, located on the same level as the bottom of the waterfall, we calculate the angle of elevation to the top of the waterfall to be 69.30°. From Observation Platform B, which is located ...
*June 16, 2012*

**Physics**

A system consists of two particles. Particle 1 with mass 2.0 kg is located at (2.0 m, 6.0 m) and has a velocity of (3.1 m/s, 2.6 m/s). Particle 2 with mass 4.5 kg is located at (4.0 m, 1.0 m) and has a velocity of (1.1 m/s, 0.6 m/s). Determine the position and the velocity of ...
*June 11, 2012*

**College Algebra**

A gardener wants to fence in her plot in two equal rectangular sections. If she has 120 yards of fence and the area of the entire plot is 384 yd 2, find the possible dimensions in yards of the garden.
*May 29, 2012*

**chemistry**

determine the energy needed to cool 10 grams of H2O from 110 degrees C to -10 degrees C?
*May 24, 2012*

**chemistry**

determine the energy needed to raise the temperature of 10 grams of H2O from 25 degrees C to 75 degrees C?
*May 24, 2012*

**UoA**

356 Cal to kilowatt-hours
*May 23, 2012*

**Chemistry 2B - UC Davis**

Now calculate Kb the base dissociation constant for [C2H3O2-], acetate anion, for each of your trials from the concentrations of species at the equivalence point. Report 3 significant figures, e.g. 5.97E-10.
*May 11, 2012*

**Physics- Final exam review**

A proton with kinetic energy 100 keV is moving in a plane perpindicular to a uniform magnetic field of magnitude 2.3 T. Find the radius of its orbit. Not sure what equation to use or how to solve
*April 29, 2012*

**Physics- Final exam help**

A proton with kinetic energy 100 keV is moving in a plane perpindicular to a uniform magnetic field of magnitude 2.3 T. Find the radius of its orbit. Not sure what equation to use or how to solve.
*April 29, 2012*

**math**

two-thirds of a number, decreased by thirty-six, is at most twenty-two. Find the number.
*April 25, 2012*

**physics**

The red laser light used in supermarket scanners has a wavelength of 633 x 10-9 m. (This is 633 nanometers, 633 nm). Find the frequency of the red laser light.
*April 16, 2012*

**Math**

You have equally likely chance of choosing any number from 1 to 10. What is the probability that you choose a number greater than 6?
*April 15, 2012*

**physical science**

a hammer falls off a rooftop and strikes the ground with a certain kinetic energy. if it fell from a roof twice as tall, how would its kinetic energy compare? explain
*March 29, 2012*

**College Physics**

An electron with a speed of 1.9 × 107 m/s moves horizontally into a region where a constant vertical force of 5.4 × 10-16 N acts on it. The mass of the electron is 9.11 × 10-31 kg. Determine the vertical distance the electron is deflected during the time it ...
*March 28, 2012*

**Maths**

There are two trains. The first train is travelling at 52 km/h. The second train is travelling at 68 km/h. It takes 9 seconds for the second train to pass the first train. How long is the second train?
*March 28, 2012*

**Biology**

If nonessential amino acids are missing from the diet, can essential amino acids be substituted in the protein? I would appreciate some help with this one-thank you
*March 24, 2012*

**biology**

Traits like human height and skin color shows a wide range of phenotypes, as opposed to just two ot three. From the standpoints of genese and alleles, explain why is this so.
*March 19, 2012*