# Posts by Tim

Total # Posts: 1,494

**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

**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

**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...

**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 ...

**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 ...

**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

**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 ...

**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

**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 ...

**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 ...

**Physics**

Anyone?

**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...

**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 ...

**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

**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.

**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.

**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.

**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.

**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.

**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)

**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)

**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!

**calculus**

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

**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!

**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 ...

**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?

**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?

**Math**

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

**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...

**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?

**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 ...

**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 ...

**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 ...

**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.

**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)

**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 ...

**pre algebra**

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

**math**

Radius of a circle with a sector area of 3 square ft determined by a central angle 1/4 radian

**math**

complete the square 16x-12y=4y^2+1

**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.

**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 ?

**Calculus**

Is the answer 2.25 v

**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.

**Math**

I think the answer is 2.25V.

**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?

**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.

**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?

**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!

**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 ...

**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?

**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?

**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 ...

**Physics**

I'm supposed to get 3.21e-07 N.

**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?

**physics**

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

**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 ...

**physics**

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

**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.

**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.

**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.

**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 ...

**Physics**

I was able to figure this one out with a related question. Thank you!

**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 ...

**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 ...

**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 ...

**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.

**chemistry**

determine the energy needed to cool 10 grams of H2O from 110 degrees C to -10 degrees C?

**chemistry**

determine the energy needed to raise the temperature of 10 grams of H2O from 25 degrees C to 75 degrees C?

**UoA**

356 Cal to kilowatt-hours

**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.

**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

**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.

**math**

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

**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.

**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?

**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

**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 ...

**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?

**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

**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.

**MATH**

74.25

**geometry**

Two similar solids have a scale factor of 3:5. If the height of solid I is 3 cm, find the height of solid II. If the surface area of I is 54pi cm squared, find the surface area of II. If the volume of II is 250pi cubed, find the volume of I

**math**

85%of36145

**stats**

The vice-president of a business firm has reviewed the records of the finn's personnel and found that 70% of the employees read The Wall Street Journal. If the vice-president was to choose 12 employees at random,what is the probability that the number of these employees ...

**Physics**

A bag of blood with a density of 1050 kg/m3 is raised 1.37 m higher than the level of a patient’s arm. How much greater is the blood pressure at the patient’s arm than it would be if the bag were at the same height as the arm? Assume there is no change in drip speed ...

**stats**

please help How do you construct a pay of table?????? . Dr. Mike Adams, a local brain surgeon, believes there is a lot of money to be made renting apartments to students here in Alamosa. He is considering constructing one, two, or possibly three apartment complexes, each of ...

**math**

I want to put a 3ft wide walk around a 10ft by 15 ft pool. What is the perimeter around the figure including the path?

**STATS**

The vice-president of a business firm has reviewed the records of the firm's personnel and found that 70% of the employees read The Wall Street Journal. If the vice president was to choose 12 employees at random, what is the probability that the number of these employees ...

**stats**

. Each week during the first half of the semester, a sample of 50 students was polled to determine how many of them had their homework done before class. The following arc the results of the weekly polls: Week # # of students with homework done 1 1 2 8 3 12 4 14 5 22 6 30 7 25...

**stats**

20. The sponsor of a local soccer tournament is responsible for writing an article for the local paper announcing the 151, 2nd, and3rdplacewinners. If10teamsareinvitedtothe tournament, and the sponsor wanted to get the article written in advance so it can go out in the next ...

**statistics**

12. A statistics student received a grade of 85 on a statistics midterm. If the corresponding z score equaled +1.50, and the standard deviation equaled 7, what was the average grade on this exam? a. 95.5 b. 74.5 c. 78.0 d. Cannot determine without knowing how many took the ...

**stats**

if one can choose any six of 40 numbers, in any order, to play a state lottery game, how many different arrangments are possible?

**physics**

A pitched ball is hit by a batter at a 45° angle and just clears the outfield fence, 90 m away. Assume that the fence is at the same height as the pitch and find the velocity of the ball when it left the bat. Neglect air resistance.

**physics**

A ball rolls with a speed of 6.4 m/s toward the edge of a table that is 0.7 m above the floor. The ball rolls off the table. a. Find the magnitude of the balls velocity when it hits the floor. m/s b. At what angle, measured from the horizontal, will the ball's velocity ...

**Physics resistance question**

No drop

**stats**

The sponosor of a local soccer tournament is responsible for writting an article for the local paper announcing the 1st, 2nd, 3rd place winners.If 10 teamsare invited to the tournament, ans th sponsor wanted to get the article written in adance so it can go out in the next ...

**trig**

The minute hand of a clock is 6 inches long. What distance does its tip move in 16 minutes?

**psychology**

what are some movies that is related to the issues of child development and developmental psychology

**psychology**

What are some movies that is related to the issues of child development and developmental psychology

**Physics**

The driver of a truck slams on the brakes when he sees a tree blocking the road. The truck slows down uniformly with acceleration −5.15 m/s2 for 4.20 s, making skid marks 62.1 m long that end at the tree. With what speed does the truck then strike the tree?