# Math/Physics

206,302 results, page 80

### physics

A car travelled 7km40degree west of north and then 10km east.what is the resultant displacement using scale drawing

### physics

A particle is drop from a vertical height (h) and falls freely for a time(t) with the aid of a sketch explain how (h) varies with (I) t (ii) t square

### physics

what is the minimum effort required to raise a load of 5kg in an ideal pulley system taking gravity to be 10m/s/s

### Physics

A vehicle moves in a straight line with an acceleration of 2 km/h^2. By how much does the speed change each second? Answer in units of km/h. Plz help?

### Physics

A 83.0-kg person, hanging from a rope, is being pulled away from a burning building by a firefighter, as shown in the figure below.

### physics

A stone is moved round a horizontal circle with a 20 cm long string tied to it. if centrepetal acceleration is 9.8 m/s2, then its angular velocity

### physics

A body moving with a velocity of 3m/s is brought to rest by a constant force after travelling 15m, calculate the retardation.

### Physics

A flywheel with a moment of inertia of 1.00kg m^2 is rotating at 100 rpm. What torque is required to bring it to rest in 10.0 revolutions?

### Physics

Rain drops hitting the side window of a car in motion often leave diagonal streaks if there is no wind. Why?

### Physics

For a certain projectile, the horizontol range is twice in magnitude of the maximum height attained by it. Find its angle of projection.

### physics

Find the gravitational force of attraction between two balls each weighing 10 kg,when placed at a distance of 1 meter apart

### physics

What should be the minimum initial velocity with which a missile has to be launched so that it reaches a target of 1000km away in the same plane

### physics

How much work must an ideal refrigerator perform to make 1 kg of ice at -10C from 1 kg of water at 20C when 20C is also its exhaust temperature?

### physics

A man holds a child on shoulders while watching a football match. How much work has he done if the game last for 2 hours

### Physics

a 4500 kg truck traveling at 17.5 m/s collides with a motionless 1350 kg car. they become locked together. if there is no friction, what is their velocity?

### Physics

what is the distance that a satellite must be from Earths surface if it's period of rotation is 1 day? I really not sure where to even start..

### physics, science

What centripetal force is needed to keep a 10 kg object moving at a constant speed of 10 m/s in a circle having a radius of 11 m?

### physics

if someone throws a .1kg ball at the speed of -25m/s, why is the average net force positive instead of negative?

### physics

How much elastic potential energy is stored if a 5kg object is suspended from a whose spring constant is 100N/m

### Physics

you are skiing down a slope angled at 30 degrees to the horizontal. Your acceleration is 2m/s^2. what is the coefficient of kinetic friction between you and the hill?

### physics

A 60kg boy climbs 70 fligts of stairs each 20cm high in one minute how much powers is developed?

### physics

Determine the ionization energy required to extract the electron totally out of a hydrogen atom, and put it at rest

### Physics

Computer the power output in watt of a machine that lift a 50kg crete through a height of 20cm in 1minute

a body reaches the max height of 80m when projected at the angle of 30degree find the horizontal component

### Physics

Let F1=10i-15j-20k,F2=6i+8j-12k. Find their dot product and the angle between those two vectors

### physics

the Ferris wheel has a diameter of 150m and takes 30min to make a full circle. Determine the speed of ride in m/s

### physics

determine the center of mass for three particles(1.5, 2.5, 3.5) forming a equilateral triangle one side lenght of 135cm.

### Physics

3 particles of masses m1 = 1.5 kg , m2 = 2.5 kg and m3 = 3.5 kg form an equilateral triangle of edge length l= 135 cm. Determine the center of mass of the system.

### Physics

Find the terminal velocity of a raindrop of diameter 3mm when it fall through atmospheric air (Appointment and is 249.7m/s)

### Physics (Waves)

Determine the angle between a polarizer-analyzer combination that allows 33% of the incident light to pass through.

### physics

200g of steam at 110°C is condensed, and the resulting water is frozen into ice at 0°C. How much heat was removed?

### physics relativity

An observer on Earth sees you travel 1000 m at half the speed of light. What distance do you think that you travelled?

### Physics

Two positive charges of 0.2microC and 0.01 microC are placed 10cm apart. Calculate the work done in reducing their distance to 5 cm

### physics

A car is traveling at 33.0 m/s  when the driver uses the brakes to slow down to 29.0 m/s in 2.50 seconds.   How many meters will it travel during that time

### physics

An object with a height of 12cm is placed 4cm in front of a concave mirror whose radius of curvature is 16cm.

### physics

with what minimum acc can a fireman slide down a rope whose breaking strenght is two third of his weight ?

### Physics 2

How many grams of steam at 100C must be mixed with 200g of water at 20C in order for the equilibrium temperature to be 50C?

### Physics

An electric filament can heat 200 cm^3 of water from 5°C to 95°C in 6 minutes. If the voltage source is a 12 V battery, how much current does it draw?

### Physics

A vector has a magnitude of 3.50m and points in a direction that is 145 degree counter wise from the x-axis. find the x and y components

### Physics

A car weighing 1000kg is going up an incline with a slope of 2 in 25 at a steady speed of 18kmph.If g=10m/s2, the power of its engine is

### Physics

A body is thrown up with a velocity of 78.4m/s.find how height will with rise and how much time if it take to return its point of rejection?

### Physics

A body is thrown up with a velocity of 78.4m/s.find how height will with rise and how much time if it take to return its point of rejection?

### Physics

A boy of mass 50kg running at 5m/s jums on to a 20kg trolly travelling in the same direction at 1.5m/s .what is their common velocity.

### Physics/chemistry

Which of the following substances does not conduct electricity? A. Graphite B. Glass C. Sulphuric acid D. Table salt solution

### physics bob

still i cant find the normal force without mass of automabile. is normal force mass times gravity sin theta? on a level road the stopping distance for an automobile is 35.0m for an initail speed of 90 km/hr what is the stopping distance of the same automobile on a simalr road ...

### phsyics

Posted by MELANA on Thursday, October 18, 2007 at 5:14pm. An object in equilibrium has three forces exerted on it. A 30 N force acts at 90° from the x-axis and a 44 N force acts at 60° from the x-axis. What are the magnitude and direction of the third force? NO IDEA WHERE TO...

### math

I need help on a math question. It says to write two fractions with a product between 10 and 11. Does anyone know what the answer is? Thanks. THere are several million ways to do this: 21/2 * 1/1 21/3 * 3/2 and so on and so on.

### A math question needs answering

math terminology needed! how do you find the whole set in fractions? How do you work out (20x2)- x =10 -x

### math

does any one have a fifth grade math book My son forgot his and we need the problems 8-20 even only on page 47 thanks

### Math

my math book tells me (Use the digits0,2,and5 to make a three digit numberthat has both 2 and 5 as factors.) please help

### Math

I've missed a lot of math in the past few years so I'm a bit behind. I need to solve this question using reciprocals. 15.6 + 5.5 ------------- 18.1(11.1-9.2)

### math

i'm a poet... i don't know math!!! Write 3 X 10^7 km^3 , the total volume of the continental Antarctica ice sheet, in standard form. would it be 30000000000 ?

### math

Can somebody PLEASE help me understand how to find the domain of a function. I have an F in algebra 3 and just got a 50% on my math quiz. I'm desperate!

### math

Math:How could the following information be represented as a ration? Of fifty people interview, none had ever eaten sushi. is it 50:0

### Math

I need to describe what the graph of interval [-4, 10] looks like. I have a really hard time explaining math in words.

Writing in math. Explain how you would use a number line to round 148 to the nearest ten.

### Math- Integrated math 4.

From the function rule h(t)=60t-16t^2+2. How do we tell from the graph and the table whe h'(t) will be positive, where it will be negative, and where it is zero.

### Math

Henry took a math test and answered 22 out of 25 correctly. What is his score as a fraction, as a decimal and as a percent. Can anyone explain please

### Math

Can you use the numbers 1 - 9, along with any math symbols and operations, to arrive at the answer of 100 when the 6 and 9 have a negative sign in front of them?

### math

Multiply 34.5 by 14 and you should get 483 right. So when i did the math, i got 4830. Can you explain what i did wrong? Do i have to cross out the zero?

### Math

Samantha wants to buy 6 roses 4 carnations and 8 tulips she estimates that she will spend about 14 dollars on these flowers do you agree math chapter 5

### math

Writing in Math To find the sum of 4/9 and 7/12, Mario rewrites the fractions as 8/36 and 21/36. His answer is 29/36. Is Marion right? If not, show his error and correct it.

### math

hi! so I have almost finshed solving a math equation i'm just stuck on this one last thing: x^3=3.85x10^-17 and I don't know how to isolate for x! plz help

### math

How many different ways can you and six of your friends sit in your assigned seats in math class? (A)6!; 120 (B)6!; 720 (C)7!; 2,520 (D)7!; 5,040 C OR D?

### math

How many different ways can you and six of your friends sit in your assigned seats in math class? (A)6!; 120 (B)6!; 720 (C)7!; 2,520 (D)7!; 5,040 C?

### Math

I don't get where u got the 1:80 from 2:20 the time left in math class? Why and how did u change 2:20 to 1:80? I'm 25 yrs out of school trying to help my 5th grade daughter

### Physics

Trying to beat the heat of summer, a physics grad student went to the local toy store and purchased a child's plastic swimming pool. Upon returning home, he filled it with 154 liters of water at 25°C. Realizing that the water would probably not be cool enough, he threw ice ...

I'm not sure how to answer this: 3. THe 7th grade wants to have a back-up representative just in case the first teacher is absent. Based on the same scenario as #2, if a math teacher was chosen to be the 7th grade representative, what is the probablility that the back-up drawn...

### math

the expiremental probability that ryan will have math homework on a given school day is 80%.on how many of the next30 school days can ryan expect to have math homework?

So do you mean to say....Ferris wheels use motors, therefore meaning that electrical energy is present. Electrical energy from the motor is then turned into kinetic energy. Electricity, generated from a switch and wires, travel through the motor which makes a magnetic field. ...

### statistics

Lilly collects data on a sample of 40 high school students to evaluate whether the proportion of female high school students who take advanced math courses in high school varies depending upon whether they have been raised primarily by their father or by both their mother and ...

### math mental math

shelley spent 17 min washing the dishes. she spent 38 min cleaning her room. explain how you can use mental math to find how long shelley spent on the two tasks?

why do kids have to read math and reading thare should be less homework less reading and less math

### statistics

Lilly collects data on a sample of 40 high school students to evaluate whether the proportion of female high school students who take advanced math courses in high school varies depending upon whether they have been raised primarily by their father or by both their mother and ...

### PHYSICS- PROJECTILE MOTION

A physics book slides off a horizontal table top with a speed of 1.90 m/s. It strikes the floor after a time of 0.410 s. Ignore air resistance. a) Find the magnitude of the horizontal component of the book's velocity just before the book reaches the floor. b) Find the ...

### math

tell how you did it thank you Write an equation using n and t. The total bill (t) was twenty times the number of people (n). t = 20n ? "was", "is", "will be" translates into math as "="

### math

have a question in math (( distance between two points )) show that C(-5,-1)is the midpoint of the line segment joining A(-2,5) and B(-8,-7) please in detales .. thank u

### math

have a question in math (( distance between two points )) show that C(-5,-1)is the midpoint of the line segment joining A(-2,5) and B(-8,-7) please in detales .. thank u

### math

i am having trouble iwth the following math problem: lim x->oo -x/squre root 4+xsquare I am not sure if i multiple the denominator with the numerator?

### arithmetic

Well I am really bad at math mostly multiplication and division.When I start to think that i am getting math my teacher teachs something new what do i do.

### Math

I'm trying to decide what math course to take next year. How do Statistics and Trigonometry compare in difficulty? Which is more helpful for the SAT's? THank you for your explanations.

### math

I am already weak at math, but when they throw in letters it throws me off and confuses me more... can someone please show me how to work this problem? Ax+Hy=L,for x.

### math gr 9

hi can someone please post a website where I can do free grade 9 math exam practice.. i have already tried proprof but they are full...

### math

i just started this semester of math and i don't remember that if your adding mixed fractions are you supposed to chage it into an improper fraction to add it?

### math

Page 114 of pizzazz math has got me clueless. None of the problems make since and my homewrok is due tomorrow. Please help me!!!!

### Math

A ball has a radius of 56mm a)Calculate the surface area b)what is the volume of the sphere could somebody please answer for my math homework I need help

### Math

Writing in math Braden and bialy each bought a kazoo for \$0.89.they each paid with a \$1.00 bill. Explain two different ways to show their change.

### Math 10-3

the work i got from my math teacher says Determine the surface area of each right rectangular prism to the nearest square unit. Any Help with that?....

### Math 112

Can you use the numbers 1 - 9, along with any math symbols and operations, to arrive at the answer of 100 when the 6 and 9 have a negative sign in front of them?

### math

grandma trying to help my grandson in 5th grade math...question/"explain how knowing that 5 divided 8=0.625 helps you write the decimal for 4 5/8?

### math

Integrated Math 1. The Overland Trail: Traveling at a constant Rate. Who will make it? Need help graphing 3 sets of data on one graph?

### Math

Please help with math question below: Express the triple angle formula of tangent (i.e. tan〖(3x)〗) in terms of tanx.

### Math

Help plz I got a new Math problem that said this " Which letter has two obtuce angles? " ( My sis is " smartybrat" ) if you can answer it go by "Maddy .H."

### Math

Hello everyone! I'm a 10th grader and I scored a 3331 on my math scantron performance series test.... is this good, average or bad? Thanks! -a

### math

If it takes 1/4 an hour to type one page, how many pages can be typed in 3 1/2 hours? The answer is 14, right? But what is the written math equation to solve this?

### Physics repost

Posted by Mary on Saturday, October 6, 2007 at 5:13pm. Suppose you wish to make a solenoid whose self-inductance is 1.2 mH. The inductor is to have a cross-sectional area of 1.2 10-3 m2 and a length of 0.048 m. How many turns of wire are needed? For Further Reading Physics ...

I lost my paper for the Math Riddle Pizazz page 167 about solving systems of equations and I no longer have the problems. (It is the "did you hear about the farmer who fed his cows birdseed.." page) What are the math problems for it?!?

### physics

a person jumps from a window 15m above a safety net. The survivor stretches the net 1.0 m before coming to rest. What was the average deceleration experienced by the person when they were slowed to rest by the net? I do know the answer is -150m/s2,but I don't know how the ...

### physics

You are part of a team to help design the atrium of a new building. Your boss, the manager of the project, wants to suspend a 16.0 kg sculpture high over the room by hanging it from the ceiling using thin, clear fishing line (string) so that it will be difficult to see how the...

### Math--time

how do u add and subtract time.... ex. Math class is dismissed at 2:20pm ,It is now 1:53pm how many more minutes before math class is dismissed. It is a subtraction, but remember each hour is 60 min. 2:20 - 1:53 but you cant subtract 53 from 20, so you borrow.. 1:80 -1:53 and ...