Wednesday

July 30, 2014

July 30, 2014

Total # Posts: 319

**Physics**

What is the impact speed when a car moving at 114.0 km/h bumps into the rear of another car traveling in the same direction at 104.5 km/h?

**Physics**

Sally travels by car from one city to another. She drives for 40.2 min at 80.0 km/h, 12.0 min at 105 km/h, and 45.0 min at 40.0 km/h. She spends 13.7 min eating lunch and buying gas. (a) Determine the total distance traveled in km. (b) Determine the average speed for the trip ...

**english**

I read what you sent and I appreicate it but i have to write these sentences by tomorrow and i dont understand

**english**

ok i will do it my self what is a infinipive an independent clause and a prepositional phrase

**English**

write a sentence about what the future holds using 1 abstract noun 1 subordinate clause. and then another sentence same topic using 1concrete noun 1 adjectives 1 prepositional phrase 1 personal pronoun and 1 interjection.

**English**

Write a sentence about what the future holds using 1 subject pronoun 2 adjectives 1 proper noun

**English**

write aa sentence about what the future holds using 1 possessive pronoun 2 adverbs and 1 compound predicate

**English**

if i understood what all the nouns and adjectives and all the other stuff i would write it my self i promise

**English**

if i understood what all the nouns and adjectives and all the other stuff i would write it my self i promise

**English**

I need a sentence about what my future holds using 1 infinipive 2 independent clause and a prepositional phrase please help

**physics**

find the altitude change of a 10000-kg fighter which clims and in so doing, loses 100 m/s of airspeed

**math**

What type of graph is best suited for displaying the range and frequency distribution of the number of hours the students in a class spend on homework while still showing each individual amount of time spent on homework?

**physics**

A hydrogen atom is in the 4p state. Determine its energy.

**Chemistry**

The half life for a first order reaction is know to be 4.5 h. How long will it take for 85% to be decomposed, in h?

**Physics**

I am confused on this question.

**Physics**

What is the age in years of a bone in which the ratio 14C/ 12C is measured to be 2.3×10^−13?

**Physics**

What is the age in years of a bone in which the ratio 14C/ 12C is measured to be 2.3×10^−13?

**phyics**

Calculate (in MeV ) the binding energy per nucleon for 40 Ca .

**physics**

Part C Calculate (in MeV ) the total binding energy for 40 Ca .

**Physics**

Calculate (in MeV ) the total binding energy for 40 Ca.

**Physics**

Calculate (in MeV ) the total binding energy for 40 Ca.

**Math**

The following table represents the diameter of the cross section of a wire at continuous heights (feet) above the ground. Assume that each cross section is circular. Height(ft) 2 6 10 14 18 22 26 30 Diameter 2 2 2.0 1.8 1.6 1.5 1.3 1.2 (feet) (those should all line up) a) Appr...

**Math**

The following table represents the diameter of the cross section of a wire at continuous heights (feet) above the ground. Assume that each cross section is circular. Height(ft) 2 6 10 14 18 22 26 30 Diameter 2 2 2.0 1.8 1.6 1.5 1.3 1.2 (feet) (those should all line up) a) Appr...

**Physics**

A researcher observes hydrogen emitting photons of energy 10.2 eV. What are the quantum numbers of the two states involved in the transition that emits these photons?

**Physics**

The speed of an electron is known to be between 3.0×10^6 m/s and 3.3×10^6 m/s . Estimate the uncertainty in its position. Change in X = ? M

**Physics**

What is the energy (in eV ) of a photon of visible light that has a wavelength of 500 nm ?

**Physics**

Zinc has a work function of 4.30 ev . A 4.50eV photon strikes the surface and an electron is emitted. What is the maximum possible speed of the electron?

**Physics**

A spherical virus has a diameter of 50mm . It is contained inside a long, narrow cell of length . What uncertainty does this imply for the velocity of the virus along the length of the cell? Assume the virus has a density equal to that of water.

**Physics**

The speed of an electron is known to be between 3.0×10^6 m/s and 3.3×10^6 m/s . Estimate the uncertainty in its position.

**physics**

The speed of an electron is known to be between 3.0×10^6 m/s and 3.3×10^6 m/s . Estimate the uncertainty in its position.

**algebra**

brad wants to buy flowers for his friend with 27 $ . the daises are $1 each and the roses are $3 each. he buys 3 more daises then roses. how much did the roses cost?

**Physics**

Problem 17.11 Light from a helium-neon laser (wavelenght = 633 nm) is used to illuminate two narrow slits. The interference pattern is observed on a screen 3.0 m behind the slits. Thirteen bright fringes are seen, spanning a distance of 52 mm . Part A - What is the spacing (i...

**Physics**

Problem 17.8 Light from a sodium lamp (wavelenght = 598) illuminates two narrow slits. The fringe spacing on a screen 150cm behind the slits is 4.0 mm . Part A - What is the spacing (in mm ) between the two slits? Express your answer using two significant figures.

**Chemistry**

1 c 2 a 3 d 4 b

**physics**

Problem 17.8 Light from a sodium lamp (wavelength = 598) illuminates two narrow slits. The fringe spacing on a screen 150 cm behind the slits is 4.0 mm . Part A - What is the spacing (in mm ) between the two slits? Express your answer using two significant figures.

**Physics**

Problem 17.8 Light from a sodium lamp (wavelenght = 589) illuminates two narrow slits. The fringe spacing on a screen 150 cm behind the slits is 4.0 mm . Part A - What is the spacing (in mm ) between the two slits? Express your answer using two significant figures.

**Physics**

Problem 17.8 Light from a sodium lamp (wavelenght = 589) illuminates two narrow slits. The fringe spacing on a screen 150 cm behind the slits is 4.0 mm . Part A - What is the spacing (in mm ) between the two slits? Express your answer using two significant figures.

**Physics**

Problem 17.8 Light from a sodium lamp (wavelenght = 589) illuminates two narrow slits. The fringe spacing on a screen 150 cm behind the slits is 4.0 mm . Part A - What is the spacing (in mm ) between the two slits? Express your answer using two significant figures.

**Physics**

Problem 17.26 A thin film of (MgF2) n= 1.38 coats a piece of glass. Constructive interference is observed for the reflection of light with wavelengths of 500nm and 625nm . Part A - What is the thinnest film for which this can occur?

**Physics**

Problem 19.33 Two light bulbs are 1.0 m apart. Part A - From what distance can these light bulbs be marginally resolved by a small telescope with a 3.0cm -diameter objective lens? Assume that the lens is limited only by diffraction and wavelenght = 600nm . Express your answer...

**Physics**

Problem 17.6 A helium-neon laser beam has a wavelength in air of 633nm . It takes 1.48 ns for the light to travel through 31.0 cm of an unknown liquid. Part A - What is the wavelength of the laser beam in the liquid? Express your answer with the appropriate units.

**Physics**

Problem 17.6 A helium-neon laser beam has a wavelength in air of 633nm . It takes 1.48 ns for the light to travel through 31.0 cm of an unknown liquid. Part A - What is the wavelength of the laser beam in the liquid? Express your answer with the appropriate units.

**physics**

How long does it take light to travel through a 3.2mm -thick piece of window glass?

**algebra**

A street vendor sells about 20 shirts each day when she charges $8 per shirt. If she decreases the price by $2, she sells about 10 more shirtseach day. How can she maximize daily revenue?

**physics**

Problem 25.52 A 100-turn, 2.0-cm-diameter coil is at rest in a horizontal plane. A uniform magnetic field 60 degrees away from vertical increases from 0.50 T to 1.50 T in 0.60 s . Part A What is the induced emf in the coil? Express your answer using two significant figures.

**physics**

Problem 25.52 A 100-turn, 2.0-cm-diameter coil is at rest in a horizontal plane. A uniform magnetic field 60 degrees away from vertical increases from 0.50 T to 1.50 T in 0.60 Part A What is the induced emf in the coil? Express your answer using two significant figures.

**physics**

Problem 25.52 A 100-turn, 2.0-cm-diameter coil is at rest in a horizontal plane. A uniform magnetic field 60 degrees away from vertical increases from 0.50 T to 1.50 T in 0.60 Part A What is the induced emf in the coil? Express your answer using two significant figures.

**physics**

Problem 25.52 A 100-turn, 2.0-cm-diameter coil is at rest in a horizontal plane. A uniform magnetic field 60 degrees away from vertical increases from 0.50 T to 1.50 T in 0.60 Part A What is the induced emf in the coil? Express your answer using two significant figures.

**physics**

Problem 25.49 A 1.40-m-diameter MRI solenoid with a length of 2.80 m has a magnetic field of 2.50 T along its axis. Part A - If the current is turned off in a time of 1.2 s, what is the emf in one turn of the solenoid's windings? Express your answer using two significant ...

**physics**

A mass spectrometer is designed to separate protein fragments. The fragments are ionized by removing a single electron and then enter a 0.80 T uniform magnetic field at a speed of 2.3 * 10^5 m/s. If a fragment has a mass that is 85 times the mass of the proton, what will be th...

**Math**

i have no idea

**Physics**

Problem 22.2 2 *10 ^13 electrons flow through a transistor in 1.0 ms. Part A - What is the current through the transistor? Express your answer using two significant figures.

**Chemistry**

how to you calculate the partition coefficient of benzoic acid .13 grams in a 1.6 mL CH2Cl2 and 1.6 mL water?

**Physics**

Problem 22.2 2*10^ 13 electrons flow through a transistor in 1.0 ms. Part A - What is the current through the transistor? Express your answer using two significant figures. in mA

**Physics**

Problem 22.2 2*10^ 13 electrons flow through a transistor in 1.0 ms. Part A - What is the current through the transistor? Express your answer using two significant figures. in mA

**chemistry**

how to you find the partition coefficient of the benzoic acid in CH2Cl2 in water

**Physics**

Problem 22.16 A 7.5 v battery supplies a 3.5 mA current to a circuit for 8.2 Hr . Part A - How much charge has been transferred from the negative to the positive terminal? Express your answer using two significant figures. Part B - How much work has been done on the charges t...

**physics**

would the current be 2*10^13 X -1.6*10^-19 divided by 1?

**physics**

Problem 22.2 2 *10^13 electrons flow through a transistor in 1.0ms . Part A - What is the current through the transistor? Express your answer using two significant figures. in mA

**physics**

Problem 21.10 A proton with an initial speed of 800000 m/s is brought to rest by an electric field. Part B - What was the potential difference that stopped the proton? = Part C - What was the initial kinetic energy of the proton, in electron volts?

**Physics**

Problem 21.40 A pair of 10uF capacitors in a high-power laser are charged to 1.7kV. Paige Nieuwenhuis Part A - What charge is stored in each capacitor? Express your answer using two significant figures. Part B - How much energy is stored in each capacitor? Express your answer...

**Physics**

Problem 21.79 The plates of a 3.2 nF parallel-plate capacitor are each 0.25 m^2 in area. Part A - How far apart are the plates if there's air between them? Express your answer using two significant figures. Part B - If the plates are separated by a Teflon sheet, how thick...

**Physics**

A parallel-plate capacitor consists of two square plates 18 Cm on a side, spaced 0.50 mm apart with only air between them. What is the maximum energy that can be stored by the capacitor?

**Physics**

Problem 21.79 The plates of a 3.2nF parallel-plate capacitor are each 0.25 m^2 in area. Part A - How far apart are the plates if there's air between them? Express your answer using two significant figures. = Part B - If the plates are separated by a Teflon sheet, how thick...

**Physics**

Problem 21.10 A proton with an initial speed of 800000 m/s2 is brought to rest by an electric field. Part B - What was the potential difference that stopped the proton? Part C - What was the initial kinetic energy of the proton, in electron volts?

**algebra 1**

How do I simplify and justify the steps to: (4+105x)+5

**Physics**

Item 10 Two equally charged, 1.00 spheres are placed with 2.00 between their centers. When released, each begins to accelerate at 225 m/s2 Part A - What is the magnitude of the charge on each sphere? =

**physics**

Item 9 A small glass bead has been charged to 20 Part A - What is the magnitude of the acceleration of a proton that is 4.0 from the center of the bead? Express your answer using two significant figures. = Part B - What is the direction of the acceleration of a proton that is...

**physics**

Item 4 Two 2.0 masses are 1.0 apart on a frictionless table. Each has 1.0 of charge. Part A - What is the magnitude of the electric force on one of the masses? Express your answer using two significant figures. = Try Again; 3 attempts remaining Part B - What is the initial ac...

**physics**

A small plastic sphere with a charge of -5.0 is near another small plastic sphere with a charge of -15 . Part A - If the spheres repel one another with a force of magnitude 8.3×10−4 , what is the distance between the spheres? Express your answer using two signific...

**Physics**

Item 4 Two 2.0 masses are 1.0 apart on a frictionless table. Each has 1.0 of charge Part A - What is the magnitude of the electric force on one of the masses? Express your answer using two significant figures. = Part B - What is the initial acceleration of each mass if they ar...

**Physics**

Part A - What is the magnitude of the electric force on charge in the figure?

**Literacy 2**

English paper is MLA and a Psychology paper is APA

**CHEM 102**

Can someone help me with this question please? What is the pH at each of the points in the titration of 25.00 mL of 0.1000 MHCl by 0.1000 M NaOH:i) After adding 25.00 mL NaOH ii) After adding 26.00 mL NaOH thankyou

**Geometry**

Find d in the the simplest radical form. Right square pyramid with equilateral triangular faces. The base and sides are 8 and d is in the middle of the pyramid with a dotted line down the middle. I am just really confused on the formula to use for this problem. I would appreci...

**Physiology**

Which structures of the inner ear would be activated by a somersault? A cartwheel? By fast acceleration in a race car?

**math **

how do you figure out the length, width and height of a box with a volume of 570 cm3 and a surface area of 478 cm2.

**math **

how do you figure out the length, width and height of a box with a volume of 570 cm3 and a surface area of 478 cm2.

**Physics Class**

A crowbar is used to wrench open a wooden crate. The crowbar is situated so that a point 8 cm from the end digging into the box acts as a pivot point. The crobar is gripped on the other side, 29 cm away from the pivot. If the person exerts a force of 110 lbs on the crobar, how...

**Physics Class**

A 965 kg car is driving along a boardwalk. The car's center of mass is 45 cm in front of the rear wheels, and the distance between the front and rear wheels is 2 m. What total force does the car's front tires exert on the boardwalk? Give your answer in Newtons.

**Physics Class**

The equation describing the motion of an object is y=0.8cos(4.2t+0.32). What is its period?

**Physics Class**

A 166 g mass is attached to a horizontally mounted spring. It is pulled out to stretch the spring and then released. You determine the period of the oscilliation to be 1.0 seconds. What is the acceleration of the mass (magnitude) when the spring is stretched 33 cm during the o...

**Physics/Math**

The equation describing the motion of an object is y=0.8cos(4.2t+0.32). What is its period? I don't know how to figure this out?

**Physics**

A 166 g mass is attached to a horizontally mounted spring. It is pulled out to stretch the spring and then released. You determine the period of the oscilliation to be 1.0 seconds. What is the acceleration of the mass (magnitude) when the spring is stretched 33 cm during the o...

**physics**

A 65 g meter stick has two masses, each 250 g placed upon it. The first is located at 72 cm and the second located at 41 cm. Where should you place your finger if you wished to balance the meter stick? Give your answer in cm.

**Physics**

A 984 kg car is driving along a boardwalk. The car's center of mass is 33 cm in front of the rear wheels, and the distance between the front and rear wheels is 2 m. What total force does the car's front tires exert on the boardwalk? Give your answer in Newtons.

**Biology**

I believe that I have answered the following questions correctly, but would like some reassurance. organisms that are used to decontaminate soils may a. store contaminates in their tissues b. release pollutants into the air c. degrade the pollutants d. be plants or microorgani...

**Calc 2**

Aha I got it! Thanks so much! :)

**Calc 2**

Mggraph: but (r*cos(theta))^2 is not x^2, is it? I thought rcos(theta) = x^2 This is what I got: 1 = 5y/[(x^2)(square root of(x^2 + y^2))]

**Calc 2**

I am sorry, it is r = 5tan(theta)sec(theta)

**Calc 2**

Find a Cartesian equation for the polar curve y = 5tan(theta)sec(theta). I think I got it but I just wanted to double check. Thanks in advance!

**Physics**

You are riding a bicycle at a speed of 15 m/s. The bycicle has tires with diameters measuring 630 mm. You can approximate each tire as a solid cyllinder (to calculate inertia) with a mass of 0.5 kg. What is the total rotational kinetic energy of the bicycle?

**Physics**

i sill don't get it?

**Physics**

When throwing a ball, a pitcher exerts a torque of 150 N m for 0.15 seconds onto their arm before letting go of the ball. With an arm length of 0.9 m with inertia 0.6 kg m2, what is the speed of the ball just after it is released?

**PHysics**

The tip of a helicoptor rotor blade can reach speeds of roughly 300 mph (130 m/s). It takes about 30 seconds to get them up to speed and they have a typical radius of 20 feet (6 m). What is the average angular acceleration of the rotor blades as they get up to speed?

**Math**

29 tapes

**Math**

When you join Sally's Video Club, there is no rental charge for the first 2 tapes. Each tape then costs $2 to rent, but you can borrow one tape free as a bonus after renting 10 tapes. How many tapes would you be able to rent for $50?

**math**

What are 10 numbers that have a median of 21, a range of 20, and a mode of 10?

**Physics**

Two objects are mocing about so that their total momentum is zero. What can be said about their kinetic energy? Choose the most descriptive answer. a. the kinetic energy must be greater than zero b. the kinetic energy must be negative c. the kinetic energy must be equal to or ...

**Physics**

You are trying to package a 50g egg so that it won't break after you drop it from a height of 10 meters. You decide to use wood as a nice soft packaging to protect the egg. When the egg hits the ground, the wood "softens" the landing so that it takes 5 millisecon...

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