Total # Posts: 495
Early Childhood Education
A childs oral vocabulary is closely related to: A. his printing ability and scholarship. B. reading comprehension and ease in learning to read. C. creativity and motivation. D. attention span and distractibility. I think the answer is A
April 2, 2011
A block of mass m = 2.00 kg slides down a 30.0° incline which is 3.60 m high. At the bottom, it strikes a block of mass M = 7.20 kg which is at rest on a horizontal surface Determine the speeds of the two blocks after the collision. lighter block = heavier block = what ...
March 24, 2011
After a completely inelastic collision between two objects of equal mass, each having initial speed v, the two move off together with speed v/6. What was the angle between their initial directions? if this is the equation 2mvcos(theta)=2mv/6 what numbers would replace m and v?
March 20, 2011
16_k=8 In the equation above, _ represents one of the operations of arithmetic: addition, subtraction, multiplication, or division. If k is a positive integer not equal to 8, what must be the value of k?
March 6, 2011
Barbara is playing a game. She jumps forward 5 feet, and then steps backward 2 feet. How many jumps will it take her to reach the finish line, which is 20 feet from where she started? Make a table to show Barbara's position. Barbara will reach 20 feet on jump number _____...
March 1, 2011
An m = 6.80-kg clay ball is thrown directly against a perpendicular brick wall at a velocity of 22.0 m/s and shatters into three pieces, which all fly backward, as shown in the figure. The wall exerts a force on the ball of 2670 N for 0.110 s. One piece of mass m1 = 2.80 kg ...
February 27, 2011
Why does the division of zero equal one? I just do not understand the process. I've researched it and I have read the responses, but I do not understand them. Can Someone explain it further?
February 3, 2011
You serve a tennis ball from a height of 2.29 m above the ground. The ball leaves your racket with a speed of 18.7 m/s at an angle of 6.55° above the horizontal. The horizontal distance from the court's baseline to the net is 11.89 m, and the net is 1.07 m high. ...
January 30, 2011
In the shot put, the shot must land within a 40 degree sector. Consider a coordinate system where the vertex of the sector is at the origen, one side lies along the positive x-axis, and the units are meters. If a throw lands at the point with coordinates (16, 12), how far is ...
January 29, 2011
m= .025 kg initial velocity= 27 m/s time= 5.0*10^-4 final velocity= 10 m/s Force*time=mass( final vecolicy - negative initial velocity) F(5.0*10^-4)=(.025)(10-(-27)) F=(.025)(10-(-27))/(5.0*10^-4)
January 25, 2011
Math (please help!)
The largest Ferris Wheel in the world is the London Eye in England. The height (in metres) of a rider on the London Eye after t minutes can be described by the function h(t) = 67 sin[0.2094(t-30)] + 70 Using this equation i'm supposed to find the diameter, the maximum (top...
January 23, 2011
Based on an average cost per year to attend a university or college of your choice, how much should be invested each month to obtain the goal of that amount (the goal is 40,000$)? Assume 6%/a compounded monthly for 5 years. I don't need the answer, just the formula please!
January 20, 2011
A force of 100 Newtons acts upwards on a mass of 50 kg, another force of 60 newtons acts on the same mass downwards. calculate the accleration in which direction will be the accleration
January 16, 2011
solve the first equation for y. 5x-y=-1 subtract 5x from both sides -y=-1-5x divide by -1 y=1+5x now, plug this answer in for y in the second equation. 15x=2y 15x=2(1+5x) 15x=2+10x 5x=2 x=.4 plug this(x=.4) into the equation for y. y=1+5x y=1+5(.4) y=1+2 y=2 therefore, x=.4 ...
January 12, 2011
A tightly stretched "high wire" is 44 m long. It sags 3.8 m when a 56 kg tightrope walker stands at its center. What is the tension in the wire? 1 NIs it possible to increase the tension in the wire so that there is no sag? so far i know you do the inverse sin of (3....
January 9, 2011
A gas has a volume of 1,400 milliliters at a temperature of 20.0 K and a pressure of 101.3 kPa. What will be the volume when the temperature is changed to 40.0 K and the pressure is changed to 50.65 kPa?
December 14, 2010
Two masses (m1 = 532 grams, m2 = 114 grams) are connected with a rope through a frictionless pulley The ramp has an elevation angle θ = 65.3° and a coefficient of friction μ = 0.184. What are Fll and Fperpendicular for m1? What is the normal force on m1?
November 30, 2010
an atwood machine is set up with m1=234 grams and m2=485 grams. the height of m2 above the floor is 137 cm, and the system is released from rest. the pulley is frictionless. what is the acceleration of this system? what is the tension in the string? how long will it take for ...
November 30, 2010
Thank you so much!!! We do not know the pressure or temperature of the classroom though. This assignment was given to us for homework. We are to figure out the numbers and send them to our teacher then use them to do the lab in class tomorrow. Should we use a temp and pressure...
November 30, 2010
Alright class. Your task is to produce 175mL of carbon dioxide. You many use anything in class. You have 1 class period to produce your product. You can use as much sodium carbonate and 1.0M hydrochloric acid as needed. ( Remember is stoichiometry lab)
November 30, 2010
two crates, of mass 75 kg and 113 kg, are in contact and at rest on a horizontal surface. A 727 N force is exerted on the 75 kg crate. If the coefficient of kinetic friction is 0.15, calculate the following: a)the acceleration of the system b) the force that each crate exerts ...
November 22, 2010
what is theta, the x component, and the y component if you know the following standard vector notation: 239 m @ 261 degrees magnitude: 239 m navigational angle: 261 quadrant:3
November 14, 2010
A skier is accelerating down a 30.0° hill at a = 4.10 m/s2 a) What is the vertical component of her acceleration? b) How long will it take her to reach the bottom of the hill, assuming she starts from rest and accelerates uniformly, if the elevation change is 340 m?
October 31, 2010
Rockets A and B are fired straight upward from rest. Rocket A is launched first and accelerates at 11.2 m/s2. Rocket B is launched 2.10 s after Rocket A and B accelerates at 14.6 m/s2. Solve for the moment in time when the rockets are separated by 484 m. a) how long after ...
October 17, 2010
A particle is moving in R2 according to the law x=t^2, y=t^3 (time is measured in seconds, coordinates in meters). (a) What is the average velocity of the particle over the time interval [1,1.1]? (b) What is the instantaneous velocity of the particle at time t=1?
October 12, 2010
A flatbed truck of mass 2000kg traveling 20 m/s (about 45mph)carries a load of mass 500kg positioned 3 meters behind the cab. The load is kept on the truck by friction, and the coefficient of friction between the load and the bed of the truck is 0.5. What is the shortest ...
October 12, 2010
Jake was doing a lab to find the density of metal. Here's his data: mass of the metal sample: 45 grams, volume of metal sample: 4.5 mL. Use his data to determine the density of the metal sample. Can you help? I don't get this.
October 7, 2010
from the top of a bridge over the burlington canal, maria looks down at a sailboat at an angle of depression 15 degrees.the bridge is 18m above the water. calculate the horizontal distance from the bridge to the sailboat
September 14, 2010
A toy manufacturer is introducin g two new dolls, my first baby and my real baby. IN one hour, the company can produce 8 first baby dolls and 20 real baby dolls. Because of demand, the company produces at least twice as many first babies as real babies. The company spends no ...
August 29, 2010
Using Plancks constant as h = 6.63 E-34 J*s, what is the wavelength of a proton with a speed of 5.00 E6 m/s? The mass of a proton is 1.66 E-27 kg. Remember to identify your data, show your work, and report the answer using the correct number of significant digits and ...
June 30, 2010
An excess of zinc metal is added to 50.0 mL of a 0.100 M AgNO3 solution in a constant-pressure calorimeter. Assuming that the density of the solution is the same as for water, calculate the mass of the solution.
June 30, 2010
I'm writing a comparison paper on two popes. One of them is Innocent III, but I'm not sure what a good comparison for him would be? The catch is that it has to be within the time period: 1100-1272 Any ideas? Thanks!
April 13, 2010
A box with a square base and an open top is to have a volume of 68in^3 . Neglect the thickness of the material used to make the box, and find the dimensions of the box that would minimize the amount of material used. The width and length of the box are each ___ in. The height ...
March 30, 2010
You are given a jar containing a mixture of three different solid substances. The particles of each substance are larger than 0.5 cm in diameter. All you know about the substances is that each is a pure metal. Describe a method for determining the identities of the metals that...
February 23, 2010
suppose a pizza slice is a circle sector with a 24 angle and a radius of 15 inches. If a can of pizza sauce will cover 94 square inches of pizza, how many cans of sauce are needed to cover this slice?
February 18, 2010
we boiled water in a beaker and put a flask with a small amount of an unknown liquid into the flask then covered it with a lid with a pinhole in it, and we placed this flask in the boiling water bath until the liquid evaporated, then we let it cool and condense.
January 27, 2010
during an experiment, if not all of a liquid vaporizes, in a flask with a cap with a pinhole. will the reported molecular weight be too high or low? i was thinking too high because the liquid weighs more.
January 27, 2010