# physics please HELP !

128,227 results, page 86

### Science 8th grade please check (revised answer

Mr. Jones went to his doctor because for the past few days he has been having frequent burning uriation. The doctor preformed a urialysis. This was done by have the patient void into a collection container. The urine was cloudy and yellow in color. There was an unusual ammonia...

### Chemistry

You are a work study student in our chemistry department. Amy, your supervisor has just asked you to prepare 250ml of 2.00M H2SO4 solution for tomorrow's undergraduate experiment. The Stock Solutions cabinet is under the Stockroom Explorer. You will find find a 2.50 liter ...

### math

This was on my test and have a few more question that is from my test. 18.The Sum of five unequal natural numbers is 90. The second largest of these five numbers can be at the most? A.19 B.41(41 is the right answer) C.44 D.43 E.42 please show work. 22.In what month does the ...

### College Physics

College Physics- Inertia? Find the moment of inertia about each of the following axes for a rod that is 0.300 in diameter and 1.60 long, with a mass of 5.00×10−2 . How do you find this ? I know how to find the perpendicular and end . but this? About an axis along the ...

### Physics 11 steve or any physics teacher helpURGENT

A 30kg student pushes a 20kg box on a frictionless surface. If student accelerates at 0.80 m/s^2, what is acceleration of the box. My question is why does the box accelerate in opposite direction of the boy, and how does the frictionless surface affect this question?

### PHYSICS

ANOTHER QUICKQUESTION ABOUT THIS ONE, PLEASE HELP pete and john play a game of tug war on a frictionless icy curface. pete weighs 539 N and john weights 392 N. during the course of the game, john accelerates toward pete at a rate of 3 m/s^2. Sarah decideds to join the game as ...

### Physics

You buy a plastic dart gun, and being a clever physics student you decide to do a quick calculation to find its maximum horizontal range. You shoot the gun straight up, and it takes 3.8 s for the dart to land back at the barrel. What is the maximum horizontal range of your gun?

### Chemistry please help

Hey guys I did a lab and I have to answer the questions relating to the lab. I did question can someone please check if these are accurate 1. Calculation to Determine the molecular weight of unknown substance Mass of unknown used: 2.0 g Mass of water used: 50.0 g (0.05kg) Kf...

### Algebra

Can you please help with this problem: At Super Saver Mart (SSM), you can buy three packs of toilet paper and seven boxes of cereal for $46.00. You can also purchase 8 packs of toilet paper and 4 boxes of cereal for $75.00 at SSM. What is $14 more than the combined price of ...

### English Criticism

POEM FOR ELSA by Michael Roberts THAT day the blue-black rook fell pitifully dead You wept and stormed, tossing your lovely head, Hurling commiseration into broken skies That wept and wept, vainly as any eyes. You pitifully wept, nor would be comforted Till a bedraggled robin ...

### Physics

a golf ball is shot from a tee which is located 18.0m above the green. The initial velocity of the golf ball is 42.0 m/s at an angle of 50.0 degrees above the horizontal. The ball behaves as an ideal projectile during its flight from the tee to the green(i.e. no air resistance...

### Math

Part 1: Write two conditional statements for which the converse is true. 1. Statement: 2. Converse: 3. Statement: 4. Converse: Part 2: Write two conditional statements for which the converse is false. 5. Statement: 6. Converse: 7. Statement: 8. Converse: Listen my grandmother...

### Calculus - please check my work

differentiate each function a) y = cos^3x b) y = sin(x^3) c) y = sin^2 xcos3x my answers: a) y' = 3cos^2 x(-sinx) b) y' = cos(x^3)(3x^2) c) for this one, i don't know which one is correct. i got 2 different answers but i think they may be the same.. im not sure, i did it twice...

### Please help me solve this - PreCalc

Use identities to find the exact value of the trigonometric expression below. 1/cos2 * π/16 - 1/cot2 * π/16 PS: in words, the problem is, one divided by cosine-squared, then beside the cosine-square (still in the denominator) is pi/16. Minus one divided by cotangent-...

### SIGN LANGUAGE PLEASE HELP WITH SENTENCE STRUCTURE!

Hi, I am having problems with the structures of sentences in sign language. Can you please put each of these sentences in sign language sentence structure? What will the weather be like today? The sun will be out, and it will be windy. I thought it was going to rain. It is ...

### Literature

American literature homework question: To Kill a Mockingbird? Can someone help me understand the following question, please?: Of all the ways an author has of telling us about a character, how do we learn about the characters in To Kill a Mockingbird? -I want to say it's ...

### Math

Please check these - as we were told they were wrong by a teacher: Find the mean, mode, median and range of the following 2 problems. 1. 70,31,13,12,31,53 mean - 35 median - 31 mode - 31 range - 58 2. 50,47,50,31,37,51,34,72,15 mean- 43 median - 47 mode - 50 range - 57 If I am...

### MATHS

A travel agent arranged a payment plan for a client. It required a down payment of $150.00 and 12 monthly payments of $642.00. What was the total cost of the plan? 2. translate into math expression and solve. Some number divided by negative four is four. 3.The sume of three ...

### Kindergarten readiness

In a study about kindergarten readiness which one is true? 1.Group participation skills were viewed as insignificant in comparison to academic skills. 2. The ability to write one's name was followed by self control. 3. The majority of teachers place academic skills as the most...

### Math - Oh my gosh please help!

Lisa's Running Distances Day Distances (in kilometers) Monday 2.05 Tuesday 4.10 Wednesday 3.80 Thursday 1.95 Friday 4.05 Estimate the average distance, in kilometers, Lisa ran for the five days. Explain your estimation strategy. Based on your previous answer, estimate the ...

### chemistry

I am having trouble on this please help Indicate which of these statements is true? For those that are false,.explain why a) addition reactions always involve compounds with multiple bonds b) all addition reactions produce polymers, but not all polymers are addition polymers c...

### physics B

This is the first question on the 2003 ap physics b exam. I need help with part e. It shows a diagram of a pulley with two students. student A is on the ground with a mass of 70kg holding on to the pulley while student B is in the air with a mass of 60. Question: with what ...

### PHYSICS

Hi! I have some questions from a study guide in my physics class, and they give me the answer, but I have to show how to get the answer. I did most of them, but need help with these. Here is problem #4: What is the increase in thermal energy to a 2000 kg bus and its ...

### PHYSICS

A 54.0-cm diameter disk rotates with a constant angular acceleration of 2.0 rad/s2. It starts from rest at t = 0, and a line drawn from the center of the disk to a point P on the rim of the disk makes an angle of 57.3° with the positive x-axis at this time. Find the position ...

### physics

You are watching an archery tournament when you start wondering how fast an arrow is shot from the bow. Remembering your physics, you ask one of the archers to shoot an arrow parallel to the ground. You find the arrow stuck in the ground 50.0 m away, making a 2.00degrees angle...

### Physics

You buy a plastic dart gun, and being a clever physics student you decide to do a quick calculation to find its maximum horizontal range. You shoot the gun straight up, and it takes 36.761s for the dart to land back at the barrel. What is the maximum horizontal range of your gun?

### Physics

I have no idea of how to solve this problem. Please help. lunch tray is being held in one hand, as the drawing illustrates. The mass of the tray itself is 0.200 kg, and its center of gravity is located at its geometrical center. On the tray is a 1.00 kg plate of food and a 0....

### Physics

A 30.0kg blcok is resting on a flat horizontal table. ON top of this block is resting a a 15.0kg block, to which a horizontal spring is attached, as the drawing illustrates. The spring constant of the spring is 325N/m. The coefficient of kinetic friction between the lower ...

### Ms Sue please help

Can someone look over my assignemnt for accuracy please. Punctuation within Sentences—Colon 1. The book had some nice features, such as: a hard-bound cover, a ribbon for a bookmark, and the author’s signature.2. German grammar is simple: in that language, and there are no ...

### physics

Posted by Anonymous on Tuesday, December 2, 2008 at 12:43am. A loudspeaker is placed between two observers who are 114 m apart, along the line connecting them. If one observer records a sound level of 61.6 dB and the other records a sound level of 81.3 dB, how far is the ...

### physics

ok i'm putting in physics it'll most likely change it watch A fisherman's scale stretches 2.8 cm when a 3.7-kg fish hangs from it. (a) What is the spring constant? (b) What will be the amplitude and frequency of vibration fi the fish is pulled down 2.5 cm more and released so ...

### Chem please help me I need help

I am having trouble on this please help Indicate which of these statements is true? For those that are false,.explain why a) addition reactions always involve compounds with multiple bonds b) all addition reactions produce polymers, but not all polymers are addition polymers c...

### Cultural Diversity

Can someone please help with this question on my assignment? A culture's emphasis on autonomy or dependence impacts adult-child interaction. Of the following choices, the ____________cultures are most closely aligned in valuing dependence or autonomy. A. Asian and Mexican-...

### chemistry,

,I NEED TO DRAW A LEWIS STRUCTURE for C2n2,cyanogen,and to state the noble gas,i know the answer is neon,but i have far to many electrons and am getting the gas argon,please help :N:::C:C:::N: please where do u think i am going wrong I don't know. You didn't show any work. C ...

### Art help me please i need it soon

haystacks in brittany by paul gauguin the artis most obviously showed experimentation through his use of perspective texture *** color line Achille de gas in the uniform of a cadet how was portion used in this image to create a mood of tranquility to create an optical illusion...

### addition and subtraction of vectors

In a soccer match, the goal keeper stands on the midpoint of her goal line. she kicks the ball 25m at an angle of 35deg to the goal line. her teammate takes the pass and kicks it 40m farther, parallel to the sideline. The resultant vector is 62.2m if the field is 110m long, ...

### PHYSICS TEST !!

Hi! I have a physics test and need help with a few study questions...if you know which equations to use or how to solve any of these PLEASE tell me...thankyou! 1. One cubic meter of liquid air at standard temperature and pressure is about 900 kg. When this much liquid air ...

### english

hey people!! im new here and i just got an essay to do on english altough its the first day of school!! please guys i really need your help.. its a essay on the following topics: 1-summer 2-love is not all it's made out to be 3-a glorious sunset 4-stories like ours have happy ...

### CHEMISTRY HELP PLEASE

when I use henderson-hasselbach Ka of HOP4^2- = 4.8 x10^-13 pKa= -lg(4.8 x10^-13)=12.3 substituting I get 7.44-12.3 = lg [base/acid] e^-4.86=[base/acid}= 7.75 x10^-3 according to my textbook this answer is incorrect and should be 0.59 Please Help! IF you are trying to work the...

### Chemistry - electron configuration

Hello Dr.Bob. Could you please take a look at the following question? I know the correct answer for it, but I'm not sure how to go about solving it. Which ground state electronic configuration will most readily ionize to a 2 + cation? A) 1s22s22p63s23p64s23d10 B) ...

### CULTURAL COMMUNICATION

Your manager at work has advised you that you and two of your coworkers will be visiting a branch of your company in another country. Select a country that you would like to learn more about. Then, conduct an Internet or library search regarding the nonverbal and verbal ...

### spanish

Can you please help me with my spanish homework :? ~.~.~.~.~.~. I did most of it,but I'm stuck on a few,so please help :) ~.~.~.~.~.~. You are a contestant on a game show. The host of the show has given you these answers. Write the corresponding questions 3. El primer ...

### Chemistry(Please help)

1) Nitrosyl chloride (NOCl) decomposes at high temperature. The equation is 2 NOCl (g) -> 2 NO (g) + Cl2 (g) at 227oC Using delta Ho = 81.2 kJ and delta So = 128 J/K, calculate the value of the equilibrium constant for this reaction. I do not know how to start this problem ...

### math

please can anyone kindly help me to get the answer of this word problem,i would like someone to help me please for the word problem below...... Pat and Eric bought a large pizza that has 12 slices.Jane and Eric ate all the pizza .If Jane ate 4/6 slices, how much did Eric eat? ...

### 7th grade-Algebra Worth Problem

Please show equation and solve for the following 1. Lyn's age is 8 years less than 15 times the age of her niece Elizabeth. If the sum of their ages is 24, what is Elizabeth's age ( Let e= Elizabeth's age) 2. Bob is renting a canoe for $20, plus $9.75 per day. How mant days ...

### Physics

What is the total force on the bottom of a swimming pool 27.5m by 9.0m whose uniform depth is 1.9m? physics What is the absolute pressure on the bottom of a swimming pool? What will be the pressure against the side of the pool near the bottom?

### college algebra--please help

solve the following inequality 70x-51<70/x I get this--but I do not know how to write the final answer in a solution set 70x-51<70/x 70x^2/x - 51x /x - 70/x < 0 70x^2 - 51x - 70/x <0 (10x + 7) (7x - 10)/x <0 x=0 (10x + 7)= 0 (7x - 10)=0 Can you please help me to...

### physics

A disgruntled physics student,frustrated with finals,releases his tensions by bombarding the adjacent building,17.7 m away with water balloons. He fires one at 38 degrees from the horizontal with an initial speed of 27.1 m/s. The acceleration of gravity is 9.8 m/s^2. for how ...

### Physics

A car travalling 90km/h, applies breaks with a force of 8400N to act on the 1050kg car. a) what is the acceleration of the car when the breaks are applied? b)how long does it take to stop. c) how far does the car travel while it is breaking? could anyone please help me with ...

### AED / ASAP PLEASE

1.) Describe, in 200 to 300 words, the different approaches you can use for teaching controversial versus noncontroversial subjects. Identify the subjects and then provide a specific example of each type of instruction. 2.) Consider that one responsibility of the social ...

### English

Cn you please help me with these sentences, please? Thank you very much in advance. 1) Do you mind if I change channel to the football match? 2) If there is an earthquake and I'm inside a building, I'll get (or I ge) under a table or desk. 3) If I'm out of a building, I move ...

### physic-heat

please list all the formulas for calculating the specific heat of a substance please. thanks specific heat = (heat added)/[(mass)(delta T)] That is the equation that defines specific heat. It should be the only equation you need. "delta T" is the increase in temperature. For ...

### Physics

the only part i cant figure out is the max static friction force that acts on the block. please help show me how to find it Suppose a block with mass 2.00 kg is resting on a ramp. If the coefficient of static friction between the block and the ramp is 0.320, what maximum angle...

### PHYSICS

Please help and let me know if I did something wrong. If a cart is released from rest at a 10 meter incline and takes 28 seconds to travel down this incline. 1. Calculate the average speed of the cart? I wrote s=ad/at=10m/28 sec = 357 m/s 2. calculate the instantaneous ...

### Math- PLEASE HELP!!

At noon, Professor Simon has a petri dish with 10,000 cells of Bacteria A. In another petri dish, he has 33,000 cells of Bacteria B. Every hour, Bacteria A grows by 8%. Every hour Bacteria B cells die off, decreasing the number of cells by 6%. After how many hours will there ...

### Science 8R - help (please read!!!)

Homework - Pick 4 out of the 6 forms (types) of energy and gives an example of each from your house. Types/Forms of Energy 1. Mechanical Energy 2. Electrical Energy 3. Electromagnetic Energy 4. Heat Energy 5. Chemical Energy 6. Nuclear Energy I'm picking heat and mechanical, ...

### Life Orientation

Hi I am a matric learner and I am having trouble with an lo portfolio assignment. it is about environmental issues and im stuck. I need to identify and describe 3 environmental health hazards that cause ill health, accidents, crisis and disasters within my community or any ...

### Cooking please help

Our teacher is going to give us the following ingredients and we have to make an appetizer with all these ingredients. we can use additional ingredients but these must be the main ones and the additional ingredients cannot over power the main ones. please help me think of ...

### Physics- check answer please

1. A 15 kg boy falls out of his bed at a height of 0.50 m. What is the amount of gravitational potential energy lost by the boy? my answer: 74 J 2. What is the speed of a 0.25 kg ball if its kinetic energy is 15 J? my answer: 11 m/s 3. if the speed of an object is tripled and ...

### phyiscs help please

A 3.00*10^2 N force is pulling an 80.0 kg refrigerator across a horizontal surface. The force acts at an angle of 18.0° above the surface. The coefficient of kinetic friction is 0.200, and the refrigerator moves a distance of 8.00 m. (a) Find the work done by the pulling ...

### Physics electric force, please help!

A charge of +Q and a charge of +2Q are separated by a distance r. The electric force of +2Q on +Q has a magnitude of F and is directed to the right. Which one of the following statements is correct regarding the electric force of +Q on +2Q? (A)The electric force of +Q on +2Q ...

### please help asap

hi i need steps on how to dissemble a pentium computer. i was wondering if anyone could give me a specific website because i looked in google but I don't know, I can't find what i want. It has to be pentium and it can't be pentium 2 or three or others. Pentium is a processor, ...

### Physics

A 4.70 nC point charge is placed at the centre of a hollow metal sphere that has an inner radius 4.70 cm and an outer radius 17.6 cm. The metal sphere itself is charged to 8.40 nC. a)What is the magnitude of the electric field at a distance of 1.60 cm from the centre? b)What ...

### Chemistry grade 11

Okay I've got a HUGE chem test tomorrow and I desperately need help! Please help!!!! 73. Hematite (Fe2O3) and magnetite (Fe3O4) are two ores used as sources of iron. Which ore provides the greatest percentage of iron per kilogram? 78. A hydrate contains .050 mole of H2O to ...

### Physics (Help please)

A force platform is a tool used to analyze the performance of athletes measuring the vertical force that the athlete exerts on the ground as a function of time. Starting from rest, a 60.0 kg athlete jumps down onto the platform from a height of 0.600 m. While she is in contact...

### PHYSICS PLEASE HELP ME

A particle with an initial linear momentum of 3.44 kg · m/s directed along the positive x-axis collides with a second particle, which has an initial linear momentum of 6.88 kg · m/s, directed along the positive y-axis. The final momentum of the first particle is 5.16 kg · m...

### chem please help urgent due tomorrow

I am having trouble on this please help Indicate which of these statements is true? For those that are false,.explain why a) addition reactions always involve compounds with multiple bonds b) all addition reactions produce polymers, but not all polymers are addition polymers c...

### maths(urgent....please...)

A ball is hit at an angle of 36 degrees to the horizontal from 14 feet above the ground. If it hits the ground 26 feet away (in horizontal distance), what was the initial velocity? Assume there is no air resistance. math - Henry, Friday, April 8, 2011 at 9:59pm X = hor. = 26Ft...

### AP Physics

Jean, who likes physics experiments, dangles her watch from a thin piece of string while the jetliner she is in takes off from Dulles Airport (Fig. 4-55). She notices that the string makes an angle of 24° with respect to the vertical while the aircraft accelerates for takeoff...

### college algebra

1. answer the following for the given quadratic function f(x)=x^2+10x-11 a.what is the vertex (h,k) of f? b. what is the axis of symmetry? Please show work. 2. if f(x)=Inx, g(x)=e^5x, and h(x)=x^6 find the following a. find (fog)(x)= what is the domain of fog? b.find (gof)(x...

### Physics 12 Review

End of the semester, working on the final review... I have a couple of questions I am stuck on right now. My notes on these questions seem to have vanished into the void... 1. "A 2.0kg puck travelling due east at 2.5m/s collides with a 1.0kg puck travelling due south at 3.0m/s...

### Physics waves- check answer please

I would like to know if my answer is correct. Thanks in advanced! A person with their head sideways in the water sees a beaver slap its tail on the lake surface 1.2 km away. What is the time difference between the sound heard in the ear listening in the air and the ear hearing...

### Physics waves- check answer please

I would like to know if my answer is correct. Thanks in advanced! A person with their head sideways in the water sees a beaver slap its tail on the lake surface 1.2 km away. What is the time difference between the sound heard in the ear listening in the air and the ear hearing...

### Physics

A 4.36 kg block free to move on a horizontal, frictionless surface is attached to one end of a light horizontal spring. The other end of the spring is fixed. The spring is compressed 0.144 m from equilibrium and is then released. The speed of the block is 1.18 m/s when it ...

### business law

please help me to do my assignment 1.describe my business? (I choose restaurent business? 2.iedntify 1 contract required for this business ?Describe the use and importanceof this contract to my nominated business 3.identify and explain the elements of this valid contracti.e ...

### Physics please HELP

A meteor is approaching. Assume that the meteor started very far away from the earth and just grazes the earth. You may ignore all other forces except gravitational force between earth and meteor. Assume that mass of the meteor is much smaller than mass of the earth. With ...

### Physics (College)

Driving on asphalt roads entails very little rolling resistance, so most of the energy of the engine goes to overcoming air resistance. But driving slowly in dry sand is another story. If a 1200 kg car is driven in sand at 5.2 m/s, the coefficient of rolling friction is 0.06. ...

### Chemistry

A 25.00mL sample of a household cleaning solution was diluted to 250.0mL in a volumetric flask. A 50.00mL aliquot of this solution required 40.38mL of 0.2506 M HCl to reach a bromocresol green end point. Calculate the weight/volume percentage of NH3 in the sample. (Assume that...

### writing

Both Ernesto from barrio boy and the boy in "A Day's Wait" interact with adults. Ernesto interacts with Miss Ryan, while the sick boy interacts with his father. In a paragraph, compare and contrast how the boys interact with the adults. Focus on how the boys think of the ...

### physics

ok i need help on this other question please A 56.0 kg skier is at the top of a slope. At the initial point A, the skier is 14.0 m vertically above the final point B. (a) find the difference in gravitational potential energy associated with the skier at the points A and B if ...

### calc check

<<y=(1/A)*integral from a to b of: (1/2)[f(x)]^2 dx >> If that is the y value of the center of mass, I don't know why the factor (1/2) is there I also don't agree with your calculation of the x value, which should be 1/(ln 2). I agree with you that the area is ln 2...

### physics

A bicyclist rides 5.0km due east, while the resistive force from the air has a magnitude of 3.0N and points due west. The rider then turns around and rides 5.0km due west, back to her starting point. The resistive force from the air on the return trip has a magnitude of 3.0N ...

### Physics repost

I apologise for reposting this question but it is still not working out for me. I know that: speed of light c=3.0x10^8 Time interval delta t=0.19x10^-9s The relationship between actual time and roudtrip distance is d=ct Also if there is and uncertainty of delta time, then it ...

### Physics Please Answer

A helium ion is at rest in a laboratory when it is put in an electric field of E=2 N/C. An infrared light, of wavelength 2000 nm, is directed towards the ion. The ion is moving towards the source of radiation. After what time in the laboratory frame in seconds will the ion ...

### Physics

A 1200-kg automobile is stolen by the notorious Physics joyriders known as “the centripetal gang”. The gang tests their grasp on Newtonian physics by cruising around a banked circular track of radius 1025 m. From previous ‘experiments’ the gang has discovered the car...

### physics-mechanics

a ball, m1, is held in place, 30 degrees from the roof it is connected to, from m1 hangs a 2nd ball m2, 1 pendulum connected to another pendulum. what is the acceleration of the 2nd ball, m2, the moment m1 is released?? my 1st thought was, simply -g, since m1 isnt held anymore...

### math- please help!

Please help with these 5 problems! I have the solutions but I don't understand how to get them! 1. Perform the indicated operations and simplify: [(2/x)-1]/(x^2 -4) 2. Subtract and simplify: [12/(x^2 -4)] - [(3-x)/(x^2 + 2x)] 3. Perform the indicated operations and simplify...

### Calculus 2 / Physics

An underground tank full of water has the following shape 1) hemisphere of radius 5 m at the bottom 2) a cylinder of radius 5 m and height 10 m in the middle 3) a circular cone with base radius 5 and height 4 m at the top The top of the tan is 2 m below the ground surface and ...

### calculus 2 or physics

An underground tank full of water has the following shape 1) hemisphere of radius 5 m at the bottom 2) a cylinder of radius 5 m and height 10 m in the middle 3) a circular cone with base radius 5 and height 4 m at the top The top of the tan is 2 m below the ground surface and ...

### Math Please Help

In a recent survey of middle school students about pizza toppings, it was found that 25 students like pepperoni pizza, 31 like banana peppers pizza, and 5 likes both pepperoni and banana peppers on their pizza. if 66 students were surveyed, how many students do not like banana...

### physics: scalars/vectors

Please check. 1. Which of the following quantities are scalars, and which are vectors? a. the acceleration of a plane as it takes off- VECTOR b. the number of passengers on the plane- SCALAR c. the duration of the flight- SCALAR d. the displacement of the flight- VECTOR e. the...

### Social Studies

I am having a problem with the following question. I have read and re-read my text book in search of the proper answer to no avail, so I turn to this board for assitance please. In comparison to political life on the continent, the British system was A. Generally more free and...

### Psychology

3.If you adopt the _______ perspective, you'll reject an emphasis on what goes on in people's minds in favor of focusing on measurable behaviors that can be objectively measured. A. psychodynamic B. neuroscience C. cognitive D. behavioral 4.Agatha maintains that people are ...

### physics

A 1.5 kg snowball is fired from a cliff 12.5m high with an inital velocity of 14 m/s directed 41 degrees above the horizontal. a) how much work is done on the snowball by the gravitaitonal force during its flight to the flat ground below the cliff? b) what is the change in the...

### physics

A) If voltmeter measures 2V across a 50 ohm resistor what current goes through the resistor? B) The voltmeter itself has 10Mohm internal resistance; how much current goes through the voltmeter? C) How much current should have gone through the Ammeter? Use the formula I actual...

### physics

Four point charges are located at the corners of a square with sides of length a. Two of the charges are +q, and two are -q. Find the magnitude and direction of the net electric force exerted on a charge +Q, located at the center of the square, for each of the following ...

### English

1. She like to be idle and watch TV all day long. 2. She like to be lazy and watch TV all day long. 3. I need to examine your teeth, so open your mouth wide, please. 4. I need to check your teeth, so open your mouth widely, please. ================= Which expressions are ...

### Physics PLEASE HELP

Ernest Rutherford (the first New Zealander to be awarded the Nobel Prize in Chemistry) demonstrated that nuclei were very small and dense by scattering helium-4 nuclei (4He) from gold-197 nuclei (197Au). The energy of the incoming helium nucleus was 7.58 ✕ 10−13 J, and the...

### Physics

Hey, have a question in Physics From a power magazine released 300,000 gallons of water pr.sekund into a pipeline leading to a turbine plant. Height difference between the magazine and the turbines are 300meter. The turbines provide 0.7 GW power. How large is the efficiency of...