# Amelia

Popular questions and responses by Amelia-
## Physics

An inventive child named Chris wants to reach an apple in a tree without climbing the tree. Sitting in a chair connected to a rope that passes over a frictionless pulley, Chris pulls on the loose end of the rope with such a force that the spring scale

*asked on October 22, 2012* -
## homework help: social studies

Why were colonial minutemen so prepared for the arrival of the British in Concord? (Worth 2 points) When Washington saw the British, he fired three cannon shots sending a warning sign Paul Revere had warned villages that the redcoats were coming The Green

*asked on August 31, 2016* -
## Physics

Hi guys, would appreciate some help with this problem: When a light turns green, a car speeds up from rest to 50.0 mi/h with a constant acceleration of 8.80 mi/h·s. In the next bike lane, a cyclist speeds up from rest to 20.0 mi/h with a constant

*asked on October 9, 2008* -
## English

Read the following sentences from "The Swimming Contest" "Who the hell fired that shot?" "My gun went off," one of the boys said. When he saw me coming up the officer said, "We've lost that information, damn it! They've killed that Arab of yours" "We've

*asked on June 3, 2017* -
## physics

(a) Two microwave frequencies are authorized for use in microwave ovens: 900 and 2560 MHz. Calculate the wavelength of each. 1 cm (frequency = 900 MHz) 2 cm (frequency = 2560 MHz) (b) Which frequency would produce smaller hot spots in foods due to

*asked on May 29, 2012* -
## Physics

An elevator accelerates upward at 1.2 m/s2. The acceleration of gravity is 9.8 m/s2 . What is the upward force exerted by the floor of the elevator on a(n) 92 kg passenger? Answer in units of N

*asked on October 22, 2012* -
## physics

A wave traveling along the x axis is described mathematically by the equation y = 0.17sin(8.5πt + 0.45πx), where y is the displacement (in meters), t is in seconds, and x is in meters. What is the speed of the wave?

*asked on January 27, 2018* -
## English

At the end of her aunt's story in The Story-Teller," the older girl asks whether the girl in the story would have been rescued even if she had not been good. What does she seem to think is the theme of her aunt's story? What detail in the aunt's story

*asked on February 16, 2019* -
## physics

When serving a tennis ball, the player hits it when its velocity is zero (at the highest point of a vertical toss). The racket exerts a force of 560 N on the ball for 5.00 ms, giving it a final velocity of 45.0 m/s. Using these data, find the mass of the

*asked on December 19, 2011* -
## physics

A constant friction force of 15 N acts on a 70 kg skier for 20 s. What is the skier's change in velocity?

*asked on December 19, 2011* -
## physics

A color television has a power rating of 325 W. How much current does this set draw from a potential difference of 120 V? 1 . A i got 2.92 but its wrong?

*asked on May 14, 2012* -
## business

What jobs require a helmet? I think construction workers hockey players but I cant think of anything else. Plz help me ASAP plz! Thank you !

*asked on May 7, 2015* -
## Calculus (30min before deadline help pls )

A street light is at the top of a 16 ft pole. A 5 ft tall girl walks along a straight path away from the pole with a speed of 3 ft/sec. At what rate is the tip of her shadow moving away from the light (ie. away from the top of the pole) when the girl is 36

*asked on April 9, 2016* -
## Science

A scientist goes to a large international conference and hears about a new discovery. The scientist is very excited about these new findings and decides to verify the other scientists' results by conducting her own investigations. The scientist is being

*asked on February 19, 2019* -
## Math

assume 8 males audition, one of them being Miles, 6 females audition, one of them being Jackie, and 4 children audition. The casting director has 3 male roles available, 1 female role available, and 2 child roles available. How many different ways can

*asked on September 10, 2012* -
## Help! - Writeacher!!

Help!! Can you check my answers? 1. The small boat was scudding into the open sea with a full sail. (1 point) getting stuck sinking deeply moving swiftly* rocking harshly 2. As an outdoor enthusiast, Kristina abhorred the fact that people left debris along

*asked on March 12, 2014* -
## physics

Mary weighs 450 N and she walks down a flight of stairs to a level 4.50 m below her starting point. What is the change in Mary's potential energy? 1 J whats the PE formula? and setup?

*asked on May 10, 2012* -
## physics

A shopper in a supermarket pushes a loaded 36 kg cart with a horizontal force of 12 N. (a) How far will the cart move in 3.5 s, starting from rest? (Disregard friction.) (b) How far will the cart move in 3.5 s if the shopper places an 95 N child in the

*asked on December 12, 2011* -
## Physics

Consider the collisions between a car and a truck whose weight is much heavier than the car (M ≫ m). Friction is so small that it can be ignored. If they are both moving at the same speed when they collide, what best describes the size (or magnitude) of

*asked on October 14, 2012* -
## Chemistry

Bromine and chlorine gas react to give bromine monochloride (BrCl) according to Br2(g)+Cl2(g)⇌2BrCl(g) Given initial concentrations [Br2]=1.50 mol L-1, [Cl2]=0.90 mol L-1 and [BrCl]=0 and K=7 determine (to two decimal places) the equilibrium

*asked on February 26, 2018* -
## 6TH GR. ALGEBRA

EXTENDING THE LESSON If you add any two rational numbers, the sum is always a rational number. So, the set of rational numbers is closed under addition. Is the set of rational numbers closed under subtraction. multiplication,and division also? Explain.

*asked on December 16, 2009* -
## physics

Boxing gloves are padded to lessen the force of a blow. (a) Calculate the force exerted by a boxing glove on an opponent's face, if the glove and face compress 7.00 cm during a blow in which the 8.00 kg arm and glove are brought to rest from an initial

*asked on April 10, 2012* -
## physics

A curved road is banked at an angle such that friction is not necessary for a car to stay on the road. a 2500 kg car is traveling at a speed of 25 ms and the road has a radius of curvature equal to 40 m. calculate the magnitude of force that the road

*asked on October 4, 2015* -
## History

What led to conflict in Bosnia between the Bosniaks and Serbians? A. Free elections in Bosnia promoted a Serbian Revolution that sought to rid the region of Bosniaks through mass deportation. B. Military buildup of the Bosnian Liberation Front saw a coup

*asked on February 13, 2019* -
## Physics

The Moon's period of revolution around the Earth is 27.3 d. How far away is the moon?

*asked on November 22, 2009* -
## PHYSICS PLS HELP ME EVERYONE

m1 = 1.7 kg block slides on a frictionless horizontal surface and is connected on one side to a spring (k = 60 N/m) as shown in the figure above. The other side is connected to the block m2 = 3.4 kg that hangs vertically. The system starts from rest with

*asked on April 15, 2016* -
## Physics

b) If the car is moving much faster than the heavier truck when they collide, what best describes the size (or magnitude) of the forces between the car and the truck? 1. Not enough information is given to pick one of these answers. 2. Neither exerts a

*asked on October 14, 2012* -
## physics

A 0.145 kg baseball pitched at 35.0 m/s is hit on a horizontal line drive straight back toward the pitcher at 52.0 m/s. If the contact time between bat and ball is 1.00*10 to the -3, calculate the average force between the ball and bat during contact.

*asked on December 19, 2011* -
## Chemistry

The question says: when .422 g of phosphorus is burned, .967 g of a white oxide is obtained. Determine the empirical formula of the oxide. I did the calculations and got that there would be 1 mole Phosphorus and 4.29 mol Oxygen. To get the empirical

*asked on September 28, 2015* -
## physics

Using energy considerations, calculate the average force a 60.0 kg sprinter exerts backward on the track to accelerate from 2.00 to 6.00 m/s in a distance of 25.0 m, if he encounters a headwind that exerts an average force of 30.0 N against him.

*asked on April 10, 2012* -
## PHYSICSSS emergency

= 1.7 kg block slides on a frictionless horizontal surface and is connected on one side to a spring (k = 60 N/m) as shown in the figure above. The other side is connected to the block m2 = 3.4 kg that hangs vertically. The system starts from rest with the

*asked on April 16, 2016* -
## HELP PHYSICS PLS :)

A 15 g bullet strikes and embeds in a 2.1 kg block suspended at the end of a 1.2 m string. After the collision the string rises to a maximum angle of 22 degrees to the vertical. what is the speed of bullet? what I did MASS OF BULLET = 0.015 KG i found the

*asked on April 20, 2016* -
## Social Studies

Which solution would best help control pollution in Lake Tai while keeping Wuxi strong? People should move away to make more parkland. Factories in Wuxi should limit their waste. ** Farmers should grow fewer crops. All factories in Wuxi should be closed.

*asked on March 9, 2016* -
## physics

TV-reception antennas for VHF (channels 2 through 13) are constructed with cross wires supported at their centers, as shown in Figure 23.24. The ideal length for the cross wires is one-half the wavelength to be received, with the more expensive antennas

*asked on May 29, 2012* -
## physics

Traveling at a speed of 18.0 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 0.690. What is the speed of the automobile after 1.29 s have elapsed?

*asked on October 15, 2017* -
## Physics

A charge of -6.17 μC is traveling at a speed of 5.47 × 106 m/s in a region of space where there is a magnetic field. The angle between the velocity of the charge and the field is 53.2o. A force of magnitude5.37 × 10-3 N acts on the charge. What is the

*asked on March 11, 2018* -
## university of the south pacific

at high noon, the sun delivers 1000w to each square meter of a blacktop road.if the hot asphalt transfers energy only by radiation, what is it's steady-state temperature?

*asked on May 30, 2013* -
## physics

During a workout, the football players at State U. ran up the stadium stairs in 61 s. The stairs are 145 m long and inclined at an angle of 30°. If a typical player has a mass of 105 kg, estimate the average power output on the way up. Ignore friction and

*asked on April 10, 2012* -
## physics

How long will it take a 1630 W motor to lift a 285 kg piano to a sixth-story window 16.0 m above?

*asked on April 10, 2012* -
## English

Can someone check my answer please? Read the following sentences from "Marriage is a Private Affair." ""I owe it to you, my son, as a duty to show what is right and what is wrong. Whoever put this idea into your head might as well have cut your throat. It

*asked on January 14, 2020* -
## Pre algebra

Given a long algebraic equation, what are some strategies that you can use to make simplifying and evaluating the equation more efficient and accurate? How do inverse operations help solve algebraic equations? Give a real-world scenario where this might be

*asked on February 4, 2019* -
## physics

A hair dryer draws a current of 9.7 A. (a) How much charge passes through the hair dryer in 3.5 min? 1 C (b) How many electrons does this represent? 2 electrons

*asked on May 14, 2012* -
## physics

Using energy considerations, calculate the average force a 60.0 kg sprinter exerts backward on the track to accelerate from 2.00 to 6.00 m/s in a distance of 25.0 m, if he encounters a headwind that exerts an average force of 30.0 N against him.

*asked on April 10, 2012* -
## Physics

A person pushes on a 62-kg refrigerator with a horizontal force of -280 N; the minus sign indicates that the force points in the -x direction. The coefficient of static friction is 0.70. (a) If the refrigerator does not move, what are the magnitude and

*asked on October 15, 2017* -
## English

Compare and contrast your Independent Reading selection with one or two other selections you have read in this unit. Support your response with at least two pieces of evidence from your Independent Reading selection Be sure to give the title and author of

*asked on February 19, 2019* -
## physics

Calculate the cost of operating a 65 W light bulb continuously for a 30-day month when electrical energy costs $0.23/kW·h. $ 1

*asked on May 14, 2012* -
## College Algebra

A projectile is thrown upward with an initial velocity of 272 feet per second. After t seconds, its height h(t)above the ground is given by the function : h(t)=-16t^2+272t. a. Determine the projectile's maximum height. b. Determine how long it takes the

*asked on February 18, 2012* -
## Math

You pay 3.3 cents per minute for long-distance phone calls on your phone. Your phone bill is $3.40. Write and solve an equation to find the number of minutes m of long-distance calls you made. A. ; 103 minutes B. ; 11 minutes C. ; 83 minutes D. ; 10

*asked on April 23, 2014* -
## Science

When you are focusing an object under the microscope, explain why some parts are in focus and some part are out of focus?

*asked on August 18, 2012* -
## Math

A scuba diver dives to a depth of 50 feet, then rises 15 feet, sinks 12 feet, then rises 20 feet. Write an expression to describe this situation. Then solve it.

*asked on September 3, 2015* -
## Physics

Suppose a distant world with surface gravity of 7.12 m/s2 has an atmospheric pressure of 7.48 104 Pa at the surface. (a) What force is exerted by the atmosphere on a disk-shaped region 2.00 m in radius at the surface of a methane ocean?________N (b) What

*asked on November 7, 2012* -
## AP physics

Four forces act on a hot-air balloon with F1 = 1660 N and F2 = 5080 N , shown from the side in Figure 4-29. Find the magnitude and direction of the resultant force on the balloon. a)N b)° (counterclockwise from the horizontal)

*asked on December 12, 2011* -
## Physics

A microphone is attached to a spring that is suspended from the ceiling, as the drawing indicates. Directly below on the floor is a stationary 624-Hz source of sound. The microphone vibrates up and down in simple harmonic motion with a period of 2.31 s.

*asked on February 1, 2018* -
## Physics

A collapsible plastic bag contains a glucose solution. If the average gauge pressure in the vein is 1.21 103 Pa, what must be the minimum height h of the bag in order to infuse glucose into the vein? Assume the specific gravity of the solution is 1.03.

*asked on November 7, 2012* -
## Business Math

A furniture store sells recliners at a 70% mark-up (based on price). If the recliner costs the store $240, what price will they charge? Formula: %Markup on cost=%markup on selling price/100% - % markup on selling price x = 70%/100%-70% x = 70%/30% x =

*asked on December 8, 2009* -
## Math

Turn the recursive function into its equivalent explicit function: f(1) = 18; f(n) = f(n - 1) + 6; n is be greater than or equal to 2* How would I solve this? Any help is appreciated! Thanks! *The symbol for that is the > with a line under it, I couldn't

*asked on March 9, 2019* -
## math

show me how to do 400 divided by 43.18=

*asked on November 19, 2012* -
## physics

Citizen's band (CB) radio utilizes frequencies between commercial AM and FM. What is the frequency of a 11.34 m wavelength CB channel? 1 MHz How do you solve for MHz

*asked on May 29, 2012* -
## chem

Determine the equilibrium constant for the following reaction. 2 Fe3+(aq) + H2(g) 2 Fe2+(aq) + 2 H+(aq)

*asked on June 21, 2013* -
## science

The gravitational force between two objects in space is 800 million newtons. If the distance between them is doubled, what size will the gravitational force be (in millions of newtons)?

*asked on April 3, 2019* -
## physics

A steam iron draws 6.5 A when connected to a potential difference of 120 V. (a) What is the power rating of this iron? 1 W (b) How many joules of energy are produced in 20.0 min? 2 J (c) How much does it cost to run the iron for 20.0 min at $0.014/kW·h? $

*asked on May 14, 2012* -
## algebra

A town clock has a minute hand that is 1.5 meters long and an hour hand that is 1.2 meters long. What is the approximate distance in meters between the ends of the hands at 9 o'clock? 2.3 1.9 0.9 0.3 can someone get me the answer? thanks

*asked on October 29, 2019* -
## Math

Writing with exponents 2x2x2

*asked on December 3, 2014* -
## physics

A net charge of 47 mC passes through the cross-sectional area of a wire in 19.0 s. (a) What is the current in the wire? 1 A (b) How many electrons pass the cross-sectional area in 1.0 min? 2 electrons

*asked on May 14, 2012* -
## Algebra

(Note): Hello! I am really stuck on this problem and am trying to figure out how to solve it! I don't want the answer, I just want to know how to solve an equation like this: Consider a sequence whose first five terms are: -1.75, -0.5, 0.75, 2, 3.25 Which

*asked on March 12, 2019* -
## physics

A steel ball has a mass of 3.8 kg and rolls along a smooth, level surface at 56 m/s. (a) Find its kinetic energy. 1 I got 404.32J bu it doset work (b) At first, the ball was at rest on the surface. A constant force acted on it through a distance of 22 m to

*asked on May 10, 2012* -
## physics

The operating potential difference of a light bulb is 120 V. The power rating of the bulb is 105 W. Find the current in the bulb and the bulb's resistance. Current 1 A Resistance 2 I got 0.916 for A and 115 for B but they are wrong

*asked on May 14, 2012* -
## Ap physics

Four resistors are connected to a battery with a terminal voltage of 12.0 V, (R1 = 40.0 , R2 = 80.0 , R3 = 140.0 and R4 = 15.0 ) (a) Determine the equivalent resistance for the circuit. 1 (b) Determine the current in the battery. 2 V (c) Determine the

*asked on May 11, 2012* -
## Pre Calculus

Determine the quadrant in which an angle, θ, lies if θ = 8π / 7 a. 3rd quadrant b. 1st quadrant c. 4th quadrant d. 2nd quadrant

*asked on July 9, 2016* -
## Physics

007 (part 1 of 2) An elevator accelerates upward at 1.2 m/s2. The acceleration of gravity is 9.8 m/s2 . What is the upward force exerted by the floor of the elevator on a(n) 92 kg passenger? Answer in units of N 008 (part 2 of 2) If the same elevator

*asked on October 22, 2012* -
## Social Studies

How does geography affect where people live and work in Canada?

*asked on March 21, 2010* -
## physics

A 18.0-kg cart is moving with a velocity of 7.30 m/s down a level hallway. A constant force of -13.0 N acts on the cart and its velocity becomes 3.30 m/s. (a) What is the change in kinetic energy of the cart? 1 . J (b) How much work was done on the cart? 2

*asked on May 10, 2012* -
## finite math

An urn contains 4 red, 6 white, and 3 blue marbles. Three marbles are selected at random and without replacement. What is the probability that one of each color is selected? Give your answer as a decimal number, with 3 decimal places.

*asked on February 22, 2015* -
## physics

A 17-kg rock is on the edge of a 103-m cliff. (a) What potential energy does the rock possess relative to the base of the cliff? 1 . J (b) The rock falls from the cliff. What is its kinetic energy just before it strikes the ground? 2 . J (c) What speed

*asked on May 10, 2012* -
## Ap physics

A steam iron draws 6.5 A when connected to a potential difference of 120 V. (a) What is the power rating of this iron? 1 W (b) How many joules of energy are produced in 20.0 min? 2 J (c) How much does it cost to run the iron for 20.0 min at $0.014/kW·h? $

*asked on May 11, 2012* -
## Physics

The wheels, axle, and handles of a wheelbarrow weigh W = 67 N. The load chamber and its contents weigh WL = 511 N. The drawing shows these two forces in two different wheelbarrow designs. To support the wheelbarrow in equilibrium, the man’s hands apply a

*asked on November 13, 2017* -
## Pre Calculus

Determine the quadrant in which an angle, θ, lies if θ = 5.40 radians. a. 4th quadrant b. 3rd quadrant c. 2nd quadrant d. 1st quadrant

*asked on July 9, 2016* -
## Physics

Calculate the change of volume that occure when a steel bearing with an initial volume of 1.8cm^3 is heated from 20°C to 80°C. Tried to use the formula DeltaV/Vinitial=Beta×DeltaT but kept getting the wrong answer though my maths could be off?

*asked on December 5, 2017* -
## Math

I'm not sure how to do this question 7. The growth of bacteria in culture can be described by the equation N1 = N0e' where N is the number of bactena at any time t, No is the initial number of bacteria, and k is a constant. The time taken for growth to

*asked on December 15, 2009* -
## Math

please check all of my answer and tell me if they are wrong along with how to fix them. Also, I need to know numbers 10, 8, 6, 2,3,1

*asked on April 22, 2019* -
## Physics

A 7.40-kg block is placed on top of a 12.5-kg block that rests on a frictionless table. The coefficient of static friction between the two blocks is 0.610. What is the maximum horizontal force that can be applied before the 7.40-kg block begins to slip

*asked on October 23, 2017* -
## physics

You are the design engineer in charge of the crashworthiness of new automobile models. Cars are tested by smashing them into fixed, massive barriers at 50 km/h (30 mph). A new model of mass 1500 kg takes 0.11 s from the time of impact until it is brought

*asked on December 19, 2011* -
## Math

A lawn is 3 m by 5 m there is a path 1 m wide laid around the lawn. Find the area of the lawn (Please help)

*asked on October 15, 2016* -
## physics

In the 1950s, an experimental train that had a mass of 3.30 104 kg was powered across level track by a jet engine that produced a thrust of 4.90 105 N for a distance of 600 m. (a) Find the work done on the train. 1 J (b) Find the change in kinetic energy.

*asked on May 10, 2012* -
## physics

When serving a tennis ball, the player hits it when its velocity is zero (at the highest point of a vertical toss). The racket exerts a force of 560 N on the ball for 5.00 ms, giving it a final velocity of 45.0 m/s. Using these data, find the mass of the

*asked on December 19, 2011* -
## Physics

At a time when mining asteroids has become feasible, astronauts have connected a line between their 3830-kg space tug and a 5930-kg asteroid. They pull on the asteroid with a force of 671 N. Initially the tug and the asteroid are at rest, 514 m apart. How

*asked on October 9, 2017* -
## math

At a supermarket,pineapple sells for $1 per pint(16 oz).Greg wants to buy eightin 40-oz cans of pineapple juice from the supermarket.How much does he have to pay altogeather?

*asked on October 6, 2014* -
## debating

Our debating topic is 'That good news is not news.' I am on the negative team so I am saying that good news is, in fact news. I personally believe the good news really isn't news and so I'm struggling to debate for the negative team. I am the first

*asked on July 22, 2011* -
## maths

There are 40 students in a class.14 of these students are girls. What percentage of the class are girls?

*asked on April 5, 2016* -
## Math Statistics

Czarina is working part time at a pastry shop baking cupcakes. If she works for 30 hours in one week on the average, how many hours a day does she work if she works 5 days a week?

*asked on October 19, 2012* -
## Maths

Evaluate the expression √−7/√ −6√−5 and write the result in the form a+bi. I keep getting b as 0.483i but apparently its wrong?

*asked on February 14, 2018* -
## Dynamics

It takes 16s to raise a 2800lb car and the supporting 650lb hydraulic car-lift platform to a ht of 6.5 ft. Knowing that the overall conversion efficiency from electric to mechanical power for the system is 82% determine a) the average power output

*asked on February 22, 2013* -
## physics

What is the wavelength of an electron moving at 2.60% of the speed of light? 1 m

*asked on May 29, 2012* -
## physics

Electromagnetic radiation having a 12.0 µm wavelength is classified as infrared radiation. What is its frequency? 1 Hz i got 1.31e+13???

*asked on May 29, 2012* -
## physics

A color television has a power rating of 325 W. How much current does this set draw from a potential difference of 120 V? 1 . A i got 2.92 but its wrong?

*asked on May 14, 2012* -
## algebra

a commerical jet and a private plane leave the same airport at the same time traveling in opposite directions at average speeds of 880km/h and 450km/h respectively. in how many minutes will they be 1463 km apart.

*asked on November 21, 2010* -
## Science

Explain why n2h4 acts as bronsted lowry base but n20 does not

*asked on November 6, 2016* -
## Pre Calculus

Determine the quadrant in which a 130° angle lies. a. 4th quadrant b. 1st quadrant c. 3rd quadrant d. 2nd quadrant

*asked on July 9, 2016* -
## science-please help due first thing tommorw

the same alkali(sodium hydroxide)can be found in both hair gel and oven cleaner.explain why it is safe to put hair gel on your skin, but not on oven cleaner. plz help!Be as acurate as possible and it has to be an outstanding scientific explanation.

*asked on November 8, 2012* -
## Science

Is ice inorganic and why?

*asked on November 22, 2008*

## Pages

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