# Kristy

Most popular questions and responses by Kristy
1. ## physics

You testify as an expert witness in a case involving an accident in which car A slid into the rear of car B, which was stopped at a red light along a road headed down a hill (see the figure). You find that the slope of the hill is θ = 14.0°, that the

2. ## algebra 2

if the equation for the regression line for the data set (3,6), (6,2), (9,10) is y=2/3x+2, what is the sse for the data set? A. 16 B. 10 C. 4 D. 24

3. ## economics

. Predicting Consequences Use the table below to predict what would happen if airlines and baseball stadiums priced all seats the same instead of using variable pricing. What would happen to the number of tickets sold? What would happen to the total

4. ## chemistry

A 100.0 ml sample of 0.300 M NaOH is mixed with a 100.0 ml sample of 0.300 M HNO3 in a coffee cup calorimeter. Both solutions were initially at 35.0 degrees celcius; the temperature of the resulting solution was recorded at 37.0 degrees celcius. Determine

5. ## math

Heather is solving an equation by graphing the expressions on both sides. If her graph intersects at an infinite number of points, which statement could describe the equation Heather is attempting to solve? A. One side of the equation is a constant, and

6. ## physical science B

I have to build a roller coaster with 3 hills. Hill A is 15 inches high,it drops down to 3 inches, rises to 8 inches, drops again to 5 inches and rises a last time to 3 inches before dropping off. My question is when using a tennis ball as the car.. 1.

7. ## Algebra II

The volume of a gas in cubic centimeters, V, varies inversely with the pressure of the gas in liters per square centimeter, p. When the volume of the gas is 16 cm3, its pressure is 20 L/cm2. Find the volume of the gas when the pressure is 2.2 L/cm2.

8. ## Science

Create a scale for your model thermometer. Divide the distance between the two marks into 5-mm intervals. Starting with the lowest point, label the intervals on the straw 0, 1, 2, 3, and so on. Describe your scale below. So I don't understand this part:

9. ## physics

A 68 kg man is ice-skating due north with a velocity of 5.6 m/s when he collides with a 42 kg child. The man and child stay together and have a velocity of 3.0 m/s at an angle of 35° north of due east immediately after the collision. What are (a) the

10. ## algebra 2

according to the graph of h(w) (5.0,20.00) below, what happens when w gets very large?

11. ## algebra 2

the soccer club has planned a trip to a tournament. the cost of the van is $231 when 3 students who are not members of the club join the trip, the transportation cost per person drops by$4.50 how many soccer members are going to the tournament?

12. ## physics

In the figure, two skaters, each of mass 58.0 kg, approach each other along parallel paths separated by 2.79 m. They have opposite velocities of 1.50 m/s each. One skater carries one end of a long pole of negligible mass, and the other skater grabs the

13. ## algebra 2

Danielle needs to walk 2.5 miles. If she wants to reach her destination in 30 minutes ( hour), how fast does she need to walk?

14. ## physics

In 1939 or 1940, Emanuel Zacchini took his human-cannonball act to an extreme: After being shot from a cannon, he soared over three Ferris wheels and into a net (see the figure). Assume that he is launched with a speed of 28 m/s and at an angle of 56°.

15. ## OChem

Anhydrous conditions are vital for a successful Grignard synthesis. To demonstrate this point calculate the mass of the water it would take to destroy the phenylmagnesium bromide you will synthesize. What is he volume of this amount of water? -How exactly

16. ## physics

A skateboard with mass M rolls down a ramp, starting from rest. It takes time T to roll a distance L along the ramp. In terms of M, T, and L, what is the skateboard’s acceleration down the ramp?

Ruth carelessly parks her car on a steep hill, leaving the car in neutral and failing to engage the parking brake. The car roles down the hill, knocking down an electric line. The sparks from the broken line ignites a grass fire. The fire spreads until it

18. ## physics

As a contrast between the old and the modern and between the large and the small, consider the following: In old rural England 1 hide (110 acres) was the area of land needed to sustain one family with a single plough for one year. (An area of 1 acre is

19. ## physical science

To what Celsius temperature must a gas sample initially at 20 degrees Celsius be heated if its volume is to double while the pressure remains the same?

20. ## Chemistry

A 100.0 ml sample of 0.300 M NaOH is mixed with a 100.0 ml sample of 0.300 M HNO3 in a coffee cup calorimeter. Both solutions were initially at 35.0 degrees celcius; the temperature of the resulting solution was recorded at 37.0 degrees celcius. Determine

21. ## chemistry

How many grams of H2 are needed to produce 10.75g of NH3?

22. ## chemistry

how many drops of 0.5M NaOH are needed to neutralize 10 drops of 1.0M HCl? What would be the pH of the neutral solution?

23. ## physics

Suppose that a shot putter can put a shot at the worldclass speed v0 = 14.00 m/s and at a height of 2.160 m. What horizontal distance would the shot travel if the launch angle θ0 is (a) 45.00° and (b) 42.00°? The answers indicate that the angle of 45°,

24. ## physics

A rock is dropped from a 196-m-high cliff. How long does it take to fall (a) the first 98.0 m and (b) the second 98.0 m?

83. ## literature/ GUM

Which word is the antecedent of the underlined pronoun? The boy took his time filling out the form and then checked it for spelling errors. A. form B. boy C. errors D. time

84. ## Chemistry

The values on the label of a bottle of nitric acid are specific gravity 1.42 and assay 60%. Use these values to determine the molarity of the solution. Show your work.

85. ## physics

A disk rotates about its central axis starting from rest and accelerates with constant angular acceleration. At one time it is rotating at 7.8 rad/s; 60 radians later, its angular speed is 19 rad/s. Calculate (a) the angular acceleration (rad/s2), (b) the

86. ## physics

A rifle that shoots bullets at 404 m/s is to be aimed at a target 49.7 m away. If the center of the target is level with the rifle, how high (in cm) above the target must the rifle barrel be pointed so that the bullet hits dead center?

87. ## physics

To test the quality of a tennis ball, you drop it onto the floor from a height of 4.31 m. It rebounds to a height of 2.51 m. If the ball is in contact with the floor for 12.6 ms, what is its average acceleration during that contact?

88. ## physics

A startled armadillo leaps upward, rising 0.521 m in the first 0.204 s. (a) What is its initial speed as it leaves the ground? (b) What is its speed at the height of 0.521 m? (c) How much higher does it go?

89. ## physics

A stone is dropped into a river from a bridge 45.4 m above the water. Another stone is thrown vertically down 1.14 s after the first is dropped. Both stones strike the water at the same time. What is the initial speed of the second stone?

90. ## Math

Mike had some pieces of wood to build a doghouse. He cut each piece in fourths. Then he had 24 pieces of wood. How many whole pieces of wood did Mike have to start with?

91. ## math

Identify the initial value and growth or decay factor in each of the following exponential functions: a) y= 350 x 5^x b) Q= 25000 x (1/2)^t c) P=(7 x 10^3) x 4^t d) N= 5000 x (9/10)^t

92. ## Hamlet...essay - Writeteacher

Kristy Cheung Ms.Weately Grade 11 U English January 10, 2013 Title A person who sets off another person by being a contrast to that person is known as a foil to the character. In Shakespeare’s great tragedy Hamlet, two character Laertes and Fortinbras,

93. ## math

The height h(in ft) above the ground of a submarine-launches missile is given by the function h=-16t+96t+80 where t represents the time in seconds. Scetch a graph of this function. Determine the time at which the missile leaves and returns to the water.

94. ## geography

what are the 5 largest rivers in middle and central america and their relative location.

95. ## MATH

how can you tell the fraction and the angle measure of rotational symmetry in an octogon. i need the smallest turn that matches the original figure hope i made sense!!!

A set of whole numbers contains 1, 3, 4, 5, 6, 11, and X. The mean and median of the set are the same, and the mean is equal to one of the six known numbers above. What is the value of X?

97. ## Chemistry

How many pi bonds are in ritalin. I counted 4 pi bonds(double bonds), and 18 sigma bonds(single bonds> I want to make sure I didn't miss count anything.

98. ## Chemistry

How many pi bonds are in ritalin. I counted 4 pi bonds(double bonds), and 18 sigma bonds(single bonds> I want to make sure I didn't miss count anything.

99. ## Physics-potential energy

In a classic model, the electron of a hydrogen atom circles the proton at a radius of 0.0529·10−9m when it is in the n=1 state. What is its electric potential energy?