# Questions Asked onJuly 1, 2018

1. ## math

A golfer has 12 golf shirts in his closet. Suppose 9 of these shirts are white and the others blue. He gets dressed in the dark, so he just grabs a shirt and puts it on. He plays golf two days in a row and does not do laundry. What is the likelihood both

2. ## Physics

Four masses m1 = 1kg, m2 = 2kg, m3 = 3kg and m4 = 4kg are at the corners of a square of sides 4cm. What is the gravitational potential energy of the system?

3. ## math

5x+23 Use the commutative property of multiplication to write an equivalent algebraic expression.

4. ## Math

A smokestack is 150 feet high. A guy wire must be fastened to the stack 40 feet from the top. The guy wire makes an angle of 40∘ with the ground. Find the length of the guy wire rounded to the nearest foot. - I've got no idea where to start or what to

5. ## Math

George is driving at an average speed of 62 miles per hour.write an expression that would give his distance traveled for h hours .make a table 3,5.5,7 and 8.5 hours ???? HELPPPP ME

6. ## chemistry

Given the following equations: 2 H2O2 (aq) → 2 H2O (l) + O2 (g) and C2H4 (g) + 3 O2 (g) → 2 CO2 (g) + 2 H2O (l) The first reaction is the decomposition of hydrogen peroxide into water and oxygen gas. The oxygen gas generated in the first reaction is

7. ## Physics

A tennis player receives a shot with the ball (0.0600 kg) traveling horizontally at 51.0 m/s and returns the shot with the ball traveling horizontally at 31.0 m/s in the opposite direction. (Take the direction of the ball's final velocity (toward the net)

8. ## Math

If perimeter of a rectangle is 14/8/15 m and its length is 4/2/3m find its breadth .

9. ## Chemistry

HCl(aq)+Li2CO3(aq)→ Express your answer as a chemical equation. Identify all of the phases in your answer. Enter noreaction if no precipitate is formed.

10. ## science

Two electrons are fiXed 2 cm apart .another eleCtron is shot from infinity and stops midway between the two .what is the initial speed?

11. ## Chemistry

The rate constant for the reaction is 0.710 M–1·s–1 at 200 °C. A ---> products If the initial concentration of A is 0.00390 M, what will be the concentration after 595 s?

12. ## Chemistry

A reaction of importance in the formation of smog is that between ozone and nitrogen monoxide described by O3(g)+NO(g) --> O2(g)+NO2(g) The rate law for this reaction is: rate=k[O3][NO] Given that k = 2.87 × 106 M–1·s–1 at a certain temperature,

13. ## Chemistry

The following reactions is a first order reaction with respect to nitrite ion and its rate constant is 0.0030/s. In a solution that is 10.0 M NO2-, what is the half-life of the reaction? NH4+ + NO2- -->N2 + 2H2O

14. ## Physics

The time period of a satellite in an orbit around the earth is 90 minutes. What is the kinetic energy, potential energy and the total mechanical energy of the satellite?

15. ## Calculus 2

Consider the polar curve: r=3cos(3ϴ) a) Find the area of the first leaf of the graph. -Thank you.

16. ## chemistry

A calorimeter is filled with 250.0 g of water at 24.6oC. A 60.0 g sample of a metal at 100.0 oC is dropped in this calorimeter and causes the temperature to increase a total of 4.5oC. What is the specific heat of the metal (in J/g°C)? Ignore the

17. ## Chemistry

If a 3.9 lb ball of aluminum is coated with a 644 micrometer layer of gold, what is the density (in g/mL) of the gold-coated aluminum ball? The densities of aluminum and gold are 2.70 g/mL and 19.32 g/mL, respectively. Type your numerical answer to 2

18. ## chemistry

Determine whether a reaction will take place in the following and write a complete balanced equation: You must include phase labels. Use NR for no reaction. 1.) Ca(OH)2 (aq) + Al(NO3)3 (aq) → 2.) Cu(C2H3O2)2 (aq) + Na2SO4 (aq) → 3.) H2SO4 (aq) + KOH

19. ## chemistry

Write the total ionic and the net ionic equations for the following: 3 H2 (g) + 2 AuCl3 (aq) → 6 HCl (aq) + 2 Au (s)

20. ## Chemistry

The half-life of the following first order reaction is 231 seconds. What percent of the original concentration of nitrite ion remains after 10.0 minutes? NH4+ + NO2- --> N2 + 2H2O

21. ## Chemistry

Radioactive iodine-131 decays (beta emitter) to form Xenon-131. Iodine-131 has a half-life of 8.07 days. If a thyroid gland absorbed 20.0 microcuries of I-131 today, how many microcuries would remain after 30.0 days. Microcuries are disintegrations per

22. ## Chemistry

The rate constant for the rxn of hydrogen reacting with iodine to form hydrogen iodide is 2.7 X 10^-4 L/mol*s at 600. K and 3.5 X 10^-3 L/mol*s at 650. K. a) determine the activation energy for this reaction. b) determine the rate constant at 700. K

23. ## phisics

A ray of light shines on a mirror. The angle between the incident ray and the mirror is 65 degree. What is the total angle turned by the ray of light?

24. ## chemistry

You need to make a .300 M solution of NiSO4 aq. Calculate the mass of NiSO4 6H2O you should put into a .100-L volumetric flasl _____= mass in g

25. ## Math

Can someone give me a hand? Here's what i have so far: Use the intermediate value theorem to determine if the function: f(x)=x^3+3x^2-9x-10 has a zero in the interval [-1, 0] so this is what i have: f(-1)=-1^3+3(-1^2)-9(-1)-10=-1-3-9-10= -23 and

26. ## math

60% chocolates in a CADY chocolate box are round shaped and rest are square shaped.30% of the chocolates are in that box are both round shaped and has a peanut inside.Ryan bought a round shaped chocolate of CADY chocolate box from a shop.Then what is the

27. ## Maths

Harry has 0.6 of his marbles to his younger bro and 0.5 of the remainder to his cousin. Harry has 36 marbles left. How many marbles did harry have at first ?

28. ## Pure maths

(199+8799+687997345-852)

29. ## soc 203

Which of the following social structures is NOT reflected in the act of a wife adopting her husband’s name and foregoing her father’s (her maiden) name?

30. ## Algebra

If f(×)= 3x^2/×-2, then find f(4)

31. ## chemistry

What volume of 15.00 M CaCl2 solutions is needed to make 3.000 gallons of 5.500 M CaCl2 solution ?

32. ## Algebra

Find the real zeroes of the polynomial: f(x)=2x(x+5)^2-8x I know you can pull the factors from the leading coefficient and the constant: constant = p= 5 factors 1, 5 leading coefficient= q= 2 factors 1, 2 so would my rational zeros be: +/-{1, 1/2, 5, 5/2}

33. ## Trig

The magnitude and direction of two forces acting on an object are 100 pounds, S79degreesE, and 60 pounds N68degreesE, respectively. Find the magnitude, to the nearest tenth of a pound, and the direction angle, to the nearest tenth of a degree, of the