1. PHYSICS

A 15g bullet is fired horizontally into a block of wood with a mass of 2.5 k and embedded in the block. Initially the block of wood hangs vertically and the impact causes the block o swing so that its center of mass rises 15cm. find the velocity of the

2. Math

One model of Earth's population growth is , where t is measured in years since 1990, and P is measured in billions of people. Which of the following statements are true?

3. Physics

2) A child sits on a merry-go-round, 1.5 meters from the center. The merry-go-round is turning at a constant rate, and the child is observed to have a radial acceleration of 2.3m/s^2. How long does it take for the merry-go-round to make one revolution?

4. statistics

Suppose x is a uniform random variable with c=10 and d=60. Find the probability that a randomly selected observation exceeds 30.

5. algebra

is 3.27 a rational or irrational number

6. PHYSICS

a constant force of 6.00N acts on a 3.00kg object for 10.0s. what are the changes in the objects momentum and velocity?

7. math corrections

I got a few questions wrong and i would like some explanations on these question: 2. A pair of pants sells for \$6 more than 75% of its price of the pants? A.\$12 B.\$18 C.\$20 D.\$24 E.\$36 Choice E is wrong. 4. What is the wall thickness, inches, of a tube

8. physics

a 1.2 kg ball drops vertically onto the floor, hitting with a speed of 25m/s. it rebounds with an initial speed of 10m/s. a) what impulse acts on the ball during the contact? b) if the ball is in contact with the floor for 0.20 s, what is the magnitude of

1.after carefully constructing and double checking all of your slides, you're ready to preview your presentation. you're on the fourth slide, but you need to see the whole presentation as one unbroken flow. what button should you use to view the whole

10. life orientation

factors that cause teenage pregnancy

11. math

A jar contains 20 marbles: 4 red, 6 white and 10 blue. If you remove 1 marble at a time, randomly, what is the minimum number that you must remove to be certain that you have at least 2 marble of each color? I guessed the answer was 18 and it was correct

12. statistical analysis

The number of vehicles passing through a pharmacy drive-up line with two windows during each 15-minute period was recorded. The results are shown below. Find the median number of vehicles going through the line in a fifteen-minute period 16 8 24 22 30 19

13. math

Ahmed earns \$1.50 for every video game he sells. When he sells one carton of 30 video game, he earns an additional \$10. What is the minimum number of video games he has to sell in order to earn \$450?

14. physics

1. Two carts, one twice the mass of the other, experience the same force for the same time. What is their difference in momentum? What is their difference in kinetic energy?

15. Calculus-Math

Complete the table without using the Quotient Rule. Function y=2x^(7/2)/x Rewrite y= Differentiate y'= Simplify y' =

16. anonymous

The forms used in your coding area cost \$100.00 per one thousand forms for the first 2,000 and \$50 for every one thousand thereafter. If you need to order 5,000 forms, what is the total cost?

17. physics

a ball of mass 5kg is dropped from a height of 78.4m,the time taken by the ball to reach the ground is?

18. chemistry -repost

Still can't figure this one out-- sorry for reposting, this is the last post, if someone has time to review this question and see if they can figure out how the textbook got 1.0x10^-7 seconds Iodine combines to form I2 in liquid propane solvent with a

19. math

The approximate distance,S, in feet that an object falls in t seconds when dropped from a height can be found by using the formula S = 16t^2.In 8 seconds, the object will fall a. 256 feet b. 1,024 feet c. 1,084 feet d. 2,048 feet e. 15,384 feet please

20. Physics

A hunter holds a 3kg rifle and fires a bullet of mass 5g with a muzzle velocity of 300m/s. What is the final kinetic energy of the bullet and the riffle?

21. SCIENCE

A 1.5 kg book on top a shelf has a PE (Potential Energy) of 29.4 J. How high is the shelf?

22. Math- urgent

A golf ball can travel 170 mph. This is 10/7 times the fastest speed recorded for a hockey puck. What is the record speed for a hockey puck? Make and equation and solve.

23. PHYSICS

a marksman fires a bullet(mB=5.00g) horizontally with a velocity of 300.m/s from a rifle(mR=3.00kg)What is the recoil velocity of the rifle?

24. statistics

If 1,000 students take a test that has a mean of 40 minutes, a standard deviation of 8 minutes, and is normally distributed, how many would you expect would finish in between 24 and 48 minutes?

25. Physics

1) A car moving along a straight stretch of road at 60 mph [26.7 meters/sec]. The driver makes slams on his breaks locking them so that the car skids to a stop. Assume a constant braking force due to friction, and a kinetic friction coefficient of 0.70

I think its decades Jill enjoys reading about American history, especially the last 40 years, or four _____________, of the nineteenth century. A. centuries B. millennia C. decades D. eras

27. GEN 499

My theme is underage drinking...can someone explain this to me Explain how academic knowledge impacts the social elements and institutions of both local and global communities. Assess how the principles of active citizenship could impact the contemporary

28. Life Science, Geography, BSTD's and Mathematics

im in GRADE10, im doing those subjects: maths, lyf science, geog and bstd's. So I need help about which job i can get for doing those subjects?

29. summer math

1.Sharon drove 188.3 miles to see a softball game. If she was driving for 3 1/2 hours,what was her average rate of speed? 2.Kat worked 23 hours last week babysitting. She earned \$126.50. What was her rate of pay?

30. statistics

You can answer any questions from the questions on an exam. In how many different ways can you choose the questions, assuming that the order in which you choose the questions is irrelevant?

31. PHYSICS

3) A 10.0 kg object is hanging by a massless rope in an elevator that is traveling upward. The tension in the rope is measured to be 75.0 N. What are the magnitude and direction of the acceleration of the elevator?

Tyler wrote a paper describing life in England in the eighteenth _________, from ______ to ______. I think its A. A. century; 1801, 1900 B. decade; 1701, 1800 C. century; 1700, 1799 D. century; 1701, 1800

33. english

write a analogy paragraph "the process of reading a good book"

may cause drowsiness alcohol may intensity this effect. use oare when operating a car or dangerous machinery.which of the following is logical conclusion based on

35. PHYSICS

when a mass of 2.5kg string is attached to a spring it stretches 42cm. a) find the constant of the spring 'k' b) how much force is required to stretch the spring 50cm? c) how much energy is stored in the spring when stretched 0.35cm?

36. math

I have some problems with these questions: 3. A hat was priced at \$10.80. During a sale, the hat sold for \$9.18. What was the rate of discount on the hat? 4. A man's tax on his home is \$1,952. The tax rate is \$3.20 per \$100 of assessed value of the home? I

37. Physics

We have a projectile launched upward with an initial horizontal velocity of 20 m/s and an initial vertical velocity of 30 m/s. 1. What is the actual initial speed of the projectile? 2. What happens to the horizontal component of the velocity as the

38. Interpersonal Communication

How does confidence,hard work, unorganization and shyness relate to Interpersonal Communication? I need some example from chapter 1 and 2 from Reflect and Relate 2nd Edition by Steven McCornack. Need help before the end of the day.

39. SCIENCE

A 1.5 kg book on top a shelf has a PE of 29.4 J. How high is the shelf?

40. Geomotrey

What is the area of a regular pentagon with a side length of 9.4 feet and an apothem length of 6.5 feet?

41. biology

If a microscope has a 40× objective lens in place and a 15× eyepiece lens, the magnification of the system under these conditions is

42. Math

Explain how knowing that that 5 divided by 8 equals = .625 helps you write the decimal for 4 5/8

43. math

A refrigerator was marked down in a price from \$249.50 to \$199.60 during a sale. What was the rate of discount?

44. Economics

. A firm has prospective sales of \$50 million, fixed costs of \$60 million, and variable costs of \$40 million. What does the firm do (a) in the short run? (b) in the long run?

45. math

what is thevolume of a rectangular prism with side lengths 15.8m,24.5m and 4.2m? round to the nearest cubic meter.

46. help (check)

I think its (at a beach cottage) Which words make up the prepositional phrase in this sentence? Her cousins often spend the whole summer at a beach cottage.

47. math

x square plus 12X plus 4 equals 0 what is the value of x

48. PHYSICS

what work must a diesel engine in an 18,000kg truck do to increase its speed from 30.m/s to 40 m/s in 5.0s? what average force did the engine exert? what power was needed (in horsepower)

49. physics

calculate the amount of work it takes to increase a cars speed from 10mph to 30 mph and from 50mph to 60mph. Is more work required for 10mph to 30mph?

50. Geometry

Find 2 cos(x/2) sin(x/2) when x = -π/6. I know that cos(x/2) = +- sqrt(1-cosx)/2 and sin(x/2) = +- sqrt(1+cosx)/2, but how to use this identity I'm not entirely sure. Please help.

51. science

how to measure length accurately using meter scale?

52. surface processes on earth

What is the most significant factor that ontros yhe development of soil.

53. Physics

Average velocity

54. Algebra

Find the number of decibels for the power of the sound given. Round to the nearest decibel. A rocket engine, 2.68 cross product 10−5 watts/cm2

3.6 + 1.9

56. Psyc, statistics

Introduction to Hypothesis Testing In an article entitled “Science and ethics in conducting, analyzing, and reporting psychological research” in the journal Psychological Science (1994), psychologist Robert Rosenthal examines the relationship between a

57. math test review

7. Given that w=7r+6r+5r+4r+3r. Which of the terms listed below may be added to w to the resulting sum will be divisible by 7 for every positive integer r? A.7r B.6r C.5r D.4r E.3r

58. math

A plot of land has a side length of 47ft.What is the perimeter?

59. Math

John has 5 computer games. Julian has twice as many computer games as John. How many computer games do they have in all?

60. math

Nia found the following prices for shorts:\$25 \$28 \$19 \$20 \$18 \$19 \$32 \$29.find th mean,median,and mode for the prices

61. sci

How to prepare 1mol conc. Sol

62. sci

How to prepare 1mol conc. Sol

1/4(8y+4)-18

64. math

44-(4x+5)< 2(x+2)+x solve

65. math

A student worked V hours on Monday W hours on Tuesday X hours on Wednesday Y hours on Thursday and Z hours on Friday. What is the average (arithmetic mean)

66. math

please find it's factors 2x^3+5x^2+4x+1 thanks

67. Physics

What is elastic collision

68. biology

doing a biology project and they want us to figure out how long it takes to cook 6 different foods at 5 different temperatures and gather 30 separate data points. They want us to identify an x(independent) and a y(dependent) variable that can be recorded

69. Psychology

what motivates a person's behavior, determinism or conscious beliefs about oneself?

70. math

2012 32 32 is divided by 7 then find the remainder