# Posts by D

Total # Posts: 438

Physics
A baseball (m = 135 g) approaches a bat horizontally at a speed of 40.4 m/s (90 mi/h) and is hit straight back at a speed of 45.7 m/s (102 mi/h). If the ball is in contact with the bat for a time of 1.00 ms, what is the average force exerted on the ball by the bat? Neglect the...

Math
C. Circumference

Statisitcs
The mean height of fully grown birch trees are 18 feet with a standard deviation of 1.2 feet, normally distributed. Random samples of size 9 are drawn from this population and the mean of each sample is determined. Find that mean and the standard error of the mean, and the ...

Physics
An astronaut in his space suit and with a propulsion unit (empty of its gas propellant) strapped to his back has a mass of 146 kg. The astronaut begins a space walk at rest, with a completely filled propulsion unit. During the space walk, the unit ejects some gas with a ...

Physics
The skateboarder in the drawing starts down the left side of the ramp with an initial speed of 5.4 m/s. If nonconservative forces, such as kinetic friction and air resistance, are negligible, what would be the height h of the highest point reached by the skateboarder on the ...

physics
A hockey goalie is standing on ice. Another player fires a puck (m = 0.22 kg) at the goalie with a velocity of +63 m/s (a) If the goalie catches the puck with his glove in a time of 7.0 10-3 s, what is the average force (magnitude and direction) exerted on the goalie by the ...

Physics
A person pushes a 16.0-kg shopping cart at a constant velocity for a distance of 26.0 m. She pushes in a direction 22.0° below the horizontal. A 38.0-N frictional force opposes the motion of the cart.

physics
The National Aeronautics and Space Administration (NASA) studies the physiological effects of large accelerations on astronauts. Some of these studies use a machine known as a centrifuge. This machine consists of a long arm, to one end of which is attached a chamber in which ...

Physics
On a banked race track, the smallest circular path on which cars can move has a radius of 115 m, while the largest has a radius 165 m, as the drawing illustrates. The height of the outer wall is 18 m.

Physics
The drawing shows a circus clown who weighs 710 N. The coefficient of static friction between the clown's feet and the ground is 0.49. He pulls vertically downward on a rope that passes around three pulleys and is tied around his feet. What is the minimum pulling force ...

Physics
Well, hard to imagine the picture, but by the description the wires each side are at 16 deg. back on each side of the tooth, i.e. each at 16 deg. to the face of the tooth. Each has 18N. tension. (sin 16) x 18 = 4.9608N. Double it (2 wires), = 9.9216N. back on the tooth.

Math
But that formula does not account for the 39% discount given on the 500 cards.

phyics
A train at a constant 44.0 km/h moves east for 42 min, then in a direction 45.0° east of due north for 17.0 min, and then west for 51.0 min. What are the (a) magnitude (in km/h) and (b) angle (relative to north, with east of north positive and west of north negative) of ...

Math
A room has dimensions 2.24 m (height) × 5.30 m × 6.55 m. A fly starting at one corner flies around, ending up at the diagonally opposite corner. (a) What is the magnitude of its displacement? (b) If the fly walks rather than flies, what is the length of the ...

math (calculus)
A room has dimensions 2.24 m (height) × 5.30 m × 6.55 m. A fly starting at one corner flies around, ending up at the diagonally opposite corner. (a) What is the magnitude of its displacement? (b) If the fly walks rather than flies, what is the length of the ...

Math
(2.0)t^2/2 = (9.5)t t=????

Physics
A train at a constant 44.0 km/h moves east for 42 min, then in a direction 45.0° east of due north for 17.0 min, and then west for 51.0 min. What are the (a) magnitude (in km/h) and (b) angle (relative to north, with east of north positive and west of north negative) of ...

physic
f(t)=ct

physics
A 5.9-kg rock and a 3.0 10-4-kg pebble are held near the surface of the earth. (a) Determine the magnitude of the gravitational force exerted on each by the earth.(b) Calculate the magnitude of the acceleration of each object when released.

Algebra,Geometry
You could actually set "X"=0 to find Y, and then plug in a "0" for Y to get X.

Math
Thank you!

Math
I think. I am honestly not sure what to do.

Math
The volleyball court -if it id 80 ft long and 50 ft wide, how would you find the dimensions of the court? Explain please! Remember that I am a 6th grader. Please don't give me a 10-12th grade answer.

Physics
asdf

a student wants to estimate the population size and density of birch trees in a woodlot measuring 100 m by 100 m. On a diagram of the woodlot, she splits the area into a 10 by 10 grid and randomly selects 10 sample quadrants - (0,0), (1,4), (2,6), (3,9), (4,3), (5,5), (6,1), (...

d
the school auditorium has 8 rows of seats, divided in three rows. Each section has 15 seats. How many seats are there in total?

ENGLISH
Anne Bradstreet was never married A poems cadence, pace, or ongoing momentum aa,bb,cc,dd,ee,ff,gg Seven The writer greatly respects her father and the way he has raised her A coin of little value 6/6 100%👌🏽

health
The lower thigh muscles are rectus femoris, vastus lateralis and medialis. Located in the back of your leg are the hamstrings. These muscles help you run, jump, and walk!

Macroeconomics
D Marginal Cost

physics
60

statistics
In a survey of 400 college students, 40 were left-handed. Treating the sample as if it were random and using 0.015 as the standard deviation of the sampling distribution of the sample proportion, what is the lower bound of a 95% confidence interval for the population proportion?

marketing
Unit 5 Individual Project Deliverable Length: 4-5 body pages, 1 PERT chart, 1 Gantt chart Details: Using your current work organization (or an organization of interest) as the subject matter, research the elements of business and prepare an APA formatted paper that: Analyzes ...

Calculus
2) 2*x*e^(-4) 3) 2*x*e^(sin(x))+x^2*cos(x)*e^(sin(x)) 1) e^(x)*sin(x)^2+2*e^(x)*sin(x)*cos(x)

maths
a) 1/6,1/7,1/8,...

Science
idk!!

simple subject
What is the simple subject in: The black and white Schnauzer barked all day long.

math
0.009615

chemistry
Yeah volumes at the bottom of the page are switched

biology
Why is a denaturing solution used in the Southern blotting technique?

physics
DOnt know

chemistry
32.2

math
how many line segments are in the word FAME?

physics
278

algebra
how do you solve -x+2y=2

Investments
3.3125

Physics C
A point charge of 5.5 µC is located at the center of a spherical shell of radius 30 cm, which has a charge −5.5 µC uniformly distributed on its surface. Given: ke = 8.98755 × 10^9 Find the electric ﬁeld for a point inside the shell a distance 12 ...

World Civ
What were the social and administrative foundations of the absolute power of Ming Quing emperors?

World Civ
What were the social and administrative foundations of the absolute power of Ming Quing emperors?

World Civ
How did advances in military technology change warfare in 16th century Japan? How was the strategic balance of power reflected in the government created by Tokugawa leyasu?

World Civ
Why were so many people living in the European countryside dependent on aristocracy? (during and before the agricultural revolution in Europe)

geometry
Quadrilateral QRST is a square. If the measure of QR is 3x – 6 and TS is 6 - x. Find the area of the square.

english

english

english

home economics
When were the Home Economics Courses dropped or greatly reduced by the school system in Ontario.

Calculus 1
If you have 280 meters of fencing and want to enclose a rectangular area up against a long, straight wall, what is the largest area you can enclose?

Physics
Air in a balloon does 25 J of work while absorbing 81 J of heat. What is the change in internal energy?

Romana
Forta in Fizica este considerata o frecare intre doua sau mai multe obiecte in contact. Cine stie ce problema va fi cu viteza celor trei obiecte... Un fermier utilizeaza un tractor mare, ea poate sa areze un teren in opt ore. Tatal-ui meu ii ia trei ore sa areze terenul nostru...

Ashford
Beth gives Megan \$2 allowance a week. Then she takes Megan shopping and allows her to select what she wants to buy. If the item desired costs more than \$2, Megan's mother suggests she save her money until she has enough saved to pay for the desired item. When Megan ...

fart

Algebra
Rewrite -81/(-88) as multipulcation

Algebra
whats the answer for 14(3-7x)=-(9+2x) with simple steps on how to do it

accounting
5000

specific heat capacity
figured it out.

specific heat capacity
How much heat would be required to heat 1 gram of pure liquid water from 10C to 20C? How would i approach this problem?

math
how do yo convert the ratio 120:200 to a fraction in simpliest form

Math
Jake says that adding 0 does not change a sum. Is he correct? explain.

Chemistry
662.5

Math
Ms. Poole, my PE teacher, asked the 100 seventh in my school if they could swim. Half the boys and two thirds of the girls said yes. Seventeen boys said no. How many seventh graders know how to swim?

Chemistry
When 1.0 g of gasoline burns, it releases 11 kcal of heat. The density of gasoline is 0.74 g/mL a) How many megajoules are released when 3.0 of gasoline burns? b) If a television requires 150 kJ/h to run, how many hours can the television run on the energy provided by 3.0 gal ...

chemistry
When 1.0 g of gasoline burns, it releases 11 kcal of heat. The density of gasoline is 0.74 g/mL a) How many megajoules are released when 3.0 of gasoline burns? b) If a television requires 150 kJ/h to run, how many hours can the television run on the energy provided by 3.0 gal ...

american history
what is one reason colonist came to america

Chemistry
A sample of 0.43 moles of a metal M reacts completely with excess chlorine to form 18.23 grams of MCl. How many moles of Cl are in the sample of MCl that forms?

criminal law
thank you Ms. sue

criminal law
Describe current parole and mandatory release policies

math
Simplify: (3-7x)/8+(2x+3)/8

Chem 10
0.267

geometry
Given the quadrilateral ABCD with the following vertices A(-4, 0), B(10, 0), C(10, 10), and D(0, 14), find its area.

geometry
Consider the following. newskills15 Solve for BC (the the nearest hundredth).

Precalculus
Consider the following. f\(x\) = 5tan(1/3 x + pi/2) The period of the function above is ...

geometry
In ΔABC, angleB = 46°, angleC = 28° and AB = 50. Find BC (to the nearest hundredth).

chem
calculate the amount of heat (kcal) released when 50.0 g of water at 100degrees Celsius hits the skin and cools to a body temperature of 37 degrees Celsius.

chemistry
calculate the volume of sulfur dioxide produced when 27.9 mL O2 reacts with carbon disulfide to produce carbon dioxide and sulfur dioxide at STP

precalculus
Find an angle between 0 and 2pi that is conterminal with 27pi/10

physics
(c) Tube (c) is again filled with water. A1 and A2 are the same as in part (b). Two pistons apply different forces to the water in the tube so that the water in the right side of the tube is a height h = 0.43m above the height of the water in the left side of the tube. If F2...

e-commerce
The business plan should include the concepts and ideas covered during the past several weeks. The following points need to be addressed in your business plan for the establishment of an e-commerce site: The e-commerce infrastructure Marketing concepts for the e-commerce ...

Finance
62,025

Math 116
Use all available methods (in particular, the Conjugate Roots Theorm if applicable) to factor the polynomial function completely, making use of the given zero, f(x)=x^4+x^3+4x^2+196x-2205; -7i is a zero.

calculus
A missile is fired at an angle of 75 from the horizontal. At one point, its speed was 900 mph. Find its horizontal velocity in miles per minute

math
The probability is 1 in 4,000,000 that a single auto trip in the United States will result in a fatality. Over a lifetime, an average U.S. driver takes 50,000 trips. (a) What is the probability of a fatal accident over a lifetime? Explain your reasoning carefully. Hint: Assume...

chem
Magnesium burns in air to produce magnesium oxide, MgO, and magnesium nitride, Mg3N2. Magnesium nitride reacts with water to give ammonia. Mg3N2(s) + 6 H2O(l) → 3 Mg(OH)2(s) + 2 NH3(g) What volume of ammonia gas at 24°C and 753 mmHg will be produced from 4.46 g of ...

Physics Mehanics
A meter stick is held vertically with one end on the floor and is then allowed to fall. Find the speed of the other end when it hits the floor, assuming that the end on the floor does not slip. (Hint: Consider the stick to be a thin rod and use the conservation of energy ...

Physics Mehanics
In the figure below, wheel A of radius rA = 11 cm is coupled by belt B to wheel C of radius rC = 23 cm. The angular speed of wheel A is increased from rest at a constant rate of 1.6 rad/s2. Find the time needed for wheel C to reach an angular speed of 110 rev/min, assuming the...

Physics Mechanics
Thanks a lot. Your answer are both right. Thank you so very much.

Physics Mechanics
Particle A and particle B are held together with a compressed spring between them. When they are released, the spring pushes them apart, and they then fly off in opposite directions, free of the spring. The mass of A is 3.00 times the mass of B, and the energy stored in the ...

Physics Mechanics
Thank you so much drwls. You're a life saver. Thanks a lot! :)

Physics Mechanics
A banked circular highway curve is designed for traffic moving at 57 km/h. The radius of the curve is 211 m. Traffic is moving along the highway at 48 km/h on a rainy day. What is the minimum coefficient of friction between tires and road that will allow cars to negotiate the ...

Physics
Suppose that the terminal speed of a particular sky diver is 170 km/h in the spread-eagle position and 315 km/h in the nosedive position. Assuming that the diver's drag coefficient C does not change from one position to the other, find the ratio of the effective cross-...

Precalc
Its #2 which is 3 because you add all the degrees of all the parenthesis and add them up and that's ur answer

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