# shelby

Popular questions and responses by shelby
1. ## Chemistry

The density of dry air measured at 25 degrees Celsius is 1.19x10 to the negative 3rd power. What is the volume of 50.0g of air?

2. ## physics

A ball is thrown upward at a speed v0 at an angle of 52.0˚ above the horizontal. It reaches a maximum height of 7.3 m. How high would this ball go if it were thrown straight upward at speed v0?

3. ## economics

Suppose that people consume only three goods, as shown in this table: (5 Marks) Tennis Balls Tennis Racquets Gatorade 1998 price $2$40 $1 1998 quantity 100 10 200 1999 price$2 $60$2 1999 quantity 100 10 200 What is the percentage change in the price of

4. ## phyics

Suppose a runner completes one lap around a 400-m track in a time of 50 s. Calculate the average velocity of the runner. Express your answer in meters per second to the nearest integer.

5. ## math

answers to what kind of shoes does a frog wear(the coordinate thingies only)

6. ## Algebra

An aircraft factory manufactures airplane engines. The unit cost C (the cost in dollars to make each airplane engine) depends on the number of engines made. If x engines are made, then the unit cost is given by the function =Cx+−0.2x248x21,748 . What is

7. ## Physics

1. The figure shows a 100-kg block being released from rest from a height of 1.0 m. It then takes 0.53 s for it to reach the floor. What is the mass m of the block on the left? There is no friction or mass in the pulley, and the connecting rope is very

8. ## Chemistry

For another picnic you want to make hamburgers with pickles, again without having any left over. You need to balance the number of packages of buns (which usually contain 8 buns) with the number of packages of hamburger patties (which usually contain 12

9. ## social studies

The addition of which territories increased Spanish power under Charles V? A. the Holy Roman Empire and the Netherlands B. Turkey and Egypt C. Italy and Great Britain D. France and northern Africa Which of the following supported the arts in Spain, leading

10. ## geometry

Find angle A if angle A is supplementary to angle B, angle B is supplementary to angle C, angle B equals 12x plus 8, and angle C equals 8x minus 8

11. ## Math

in a fifth grade class, 3/4 of the students like to go to the movies. of the students who like to go to the movies, 2/3 of them like action movies. of the students who like to go to action movies, 4/5 of them also like comedies. what fraction of the

12. ## Math

Given that force 1=60 pounds and force 2=90 pounds, find the angle between the forces if the magnitude of the resultant force is 50 pounds. Round answer to the nearest degree and show work.

13. ## PHYSICS HELP!

A typical propeller of a turbine used to generate electricity from the wind consists of three blades as in the figure below. Each blade has a length of L = 33 m and a mass of m = 415 kg. The propeller rotates at the rate of 21 rev/min. 120degree angle

14. ## geometry

In the rhombus, m1 = 18x, m2 = x + y, and m3 = 30z. Find the value of the variables x,y, and z

15. ## physics

A flat (unbanked) curve on a highway has a radius of 220m. A car rounds the curve at a speed of 25m/s. What is the minimum coefficient of friction that will prevent sliding?

16. ## MUSIC

1. What is the difference between composition and improvisation? Choose the correct. A. Composition is the art of making music spontaneously, while improvisations are carefully planned. B. Improvisation is the art of making music spontaneously, while

17. ## math

out of 32 students in a class 5 said they ride their bikes to school based on these results predict how many of the 800 students in the school ride their bikes to school

18. ## Physics

In the absence of air resistance, a projectile is launched from and returns to ground level. It follows a trajectory similar to that shown in Figure 3.10 and has a range of 29 m. Suppose the launch speed is doubled, and the projectile is fired at the same

19. ## Physics

The figure (Figure 1) shows a model of a crane that may be mounted on a truck.A rigid uniform horizontal bar of mass m1 = 80.0 kg and length L = 5.30 m is supported by two vertical massless strings. String A is attached at a distance d = 1.90 m from the

20. ## College algebra

Find an nth degree polynomial. N=4, 2i and 3i are zeros, f (-1)=50

21. ## physics

The Wall of Death in an amusement park is comprised of a vertical cylinder that can spin around the vertical axis. Riders stand against the wall of the spinning cylinder and the floor falls away leaving the riders held up by friction. The radius of the

22. ## Geometry

c. Given angle ABC has angle bisector BD, where AB = CB, find the value of x if AD = 5x + 10 and DC = 28 - x. Do I just set them equal to each other ?

23. ## Trigonometry

Graph the function y=2sin(x-2pi/3). To draw the graph, plot all x-intercepts, minima and maxima within on period. I need to graph at least 5 points. I have -pi, 0, pi, 2pi, 3pi, and 4pi along the x-axis

24. ## biology

i need a short story about a ecosystem that is disturbed and undergoes succession

25. ## Geometry

a. Find the length of the midsegment of an equilateral triangle with side lengths of 12.5 cm. b. Given that UT is the perpendicular bisector of AB, where T is on AB, find the length of AT given AT = 3x + 6 and TB = 42 - x. c. Given angle ABC has angle

26. ## Chemistry

Maleic acid is a carbon-hydrogen-oxygen compound used in dyeing and finishing fabrics and as a preservative of oils and fats. * In a combustion analysis, a 1.054-\rm g sample of maleic acid yields 1.599 \rm g of \rm CO_2 and 0.327 \rm g of \rm H_2O. * When

27. ## Statistics

A university has 1,000 computers available for students to use. Each computer has a 250-gigabyte hard drive. The university wants to estimate the space occupied on the hard drives. A random sample of 100 computers showed a mean of 115 gigabytes used with a

28. ## physics

A ballistic pendulum, as shown in the figure, was a device used in the past century to measure the speed of bullets. The pendulum consists of a large block of wood suspended from long wires. Initially, the pendulum is at rest. The bullet strikes the block

29. ## Calculus

A farmer has 120 meters of wire fencing to make enclosures for his pigs and cows. The rectangular enclosure he is considering will have one side up against a barn (in the center of one side that is 150 meters long, so the enclosure won't require fencing

30. ## Physics

1. The figure shows a 100-kg block being released from rest from a height of 1.0 m. It then takes 0.53 s for it to reach the floor. What is the mass m of the block on the left? There is no friction or mass in the pulley, and the connecting rope is very

31. ## chem

1. Since the gas in your graduated cylinder is a mixture of butane and water vapor, you must determine the partial pressure of the butane, Pbutane, alone. To do this, consult a reference and record the partial pressure of the water vapor, Pwater, at the

32. ## physics

In a simple model of the wind speed associated with hurricane Emily, we assume there is calm eye 10.0 km in radius. The winds, which extend to a height of 5550 m, begin with a speed of 208.0 km/hr at the eye wall and decrease linearly with radial distance

33. ## English

A verb phrase that acts as a noun is called a? participial. adverbial. infinitive. gerund. Which of the following is the prepositional phrase in the sentence below? Applause came from the bleachers. A) Applause came B) came from C) from D) from the

34. ## geometry

a rectangle is 80 cm long and 20 cm wide. find, to the nearest degree, the acute angle formed at the intersections of the diagonals.

47. ## geometry!!

Find the lengths of the diagonals of this trapezoid. when the given length for the sides are (-b,c), (b,c),(a,0), (a,0)

48. ## geometry!!

Find the lengths of the diagonals of this trapezoid. when the given length for the sides are (-b,c), (b,c),(a,0), (a,0)

49. ## physics

Three blocks are located on a horizontal table. The coefficient of kinetic friction between the blocks and the table is 0.276. They are connected by a massless cord, as shown in the figure below, and pulled to the right. The masses of the three blocks are

50. ## algebra

a motorboat can maintain a constant speed of 11 miles per hour relative to the water. The boat makes a trip upstream to a certain point in 21 minutes; the return trip takes 1 minutes. That is the speed of the current?

51. ## physics

A golfer, standing on a fairway, hits a shot to a green that is elevated 5.39 m above where she is standing. If the ball leaves her club with a velocity of 43.1 m/s at an angle of 45.9 ° above the ground, find the time that the ball is in the air before

92. ## Physics

The captain of a plane wishes to proceed due west. The cruising speed of the plane is 255 m/s relative to the air. A weather report indicates that a 39.0-m/s wind is blowing from the south to the north. In what direction, measured with respect to due west,

93. ## Science

It can be inferred from the passage that radioactive dating is important for estimating the age of A) all known meters B) all existing planets C) the earth D) the trees

94. ## Physics

A particular asteroid has a circular orbit about the Sun with a radius of 450 million miles. How long does it take to go around the sun? Compare the prediction of Kepler's 2nd law to a direct computation with Newton's 2nd law. How much area does the line

95. ## Physics

A car slows from 17 m/s to 2.0 m/s at a constant rate of 2.1 m/s2. How many seconds are required before the car is traveling at 2.0 m/s?

96. ## physics

A golfer hits a shot to a green that is elevated 3.0 m above the point where the ball is struck. The ball leaves the club at a speed of 19.4 m/s at an angle of 45.0˚ above the horizontal. It rises to its maximum height and then falls down to the green.

97. ## physics

The record for a marathon is 4 h, 36 min, 21 s. The marathon distance is 90.25 km. Determine the average speed in m/s of a runner achieving this record.

98. ## physics

Which has the greater acceleration, a car that increases its speed from 50 to 62 km/h, or a bike that goes from 0 to 12 km/h in the same time?

99. ## physics

pulsar is a rapidly rotating neutron star that emits radio pulses with precise synchronization, there being one such pulse for each rotation of the star. The period of rotation is found by measuring the time between pulses. At present, the pulsar in the