# Questions Asked onJune 25, 2020

1. ## Trigonometry

The angle of elevation from a point on the ground to the top of a pyramid is 23^•(degree)40^’(minutes). The angle of elevation from a point 112 ft farther back to the top of the pyramid is 15^•30’. Find the height of the pyramid.

2. ## Physics

A piece of copper ball of mass 20g at 200 degree centigrade is placed in a copper calorimeter of mass 60g containing 50g of water at 30 degree centigrade. Ignoring heat losses calculate the final temperature of the mixture

3. ## Chemistry

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4. ## Astronomy

A quasar with an observed luminosity of L=1012L⊙ is shining at the Eddington limit, with a net efficiency of 10%. What is the mass accretion rate (in units of M⊙year−1)?

5. ## Calculus

Find the point on the curve y = 1/x^2 ,( x > 0 ), where the curvature is maximum.

6. ## calculus

Find the volume of the parallelepiped with the vectors A = 2i + j +3k , B = i -2j + k , C = 3i + 4j+ 2k as coterminal edges.

7. ## geometry

A sector of a circle radius 18 cm and angle 300 degrees is bent to form a cone. Calculate the base radius of the cone

8. ## Physical Science

The relative atomic mass of a sample of chlorine which contains 75.78% chlorine -35 and 24.22% chlorine-37 is ____.

9. ## science

what do you think will happen to a pulse signal (voltage is applied for a short period of time only) when it is applied to a transmission line? Will the pulse reach the end of the transmission line? What will happen if the end of the transmission line is

10. ## geometry

A right triangle is dilated by a factor of 3.5. Which statements about the resulting triangle must be true? Select all that apply. (There is more than one answer) It is smaller than the original triangle. It is an isosceles triangle. It is larger than the

X+4y=-8

12. ## Calculus

Determine whether the function f(x,y) = e^x siny is harmonic.

13. ## math

Hi! I have a question. A cook needs 5 cups of vegetable stock for a soup recipe. How much is this in pints? Write your answer as a whole number or a mixed number in simplest form. Include the correct unit in your answer. and these are the units. fl oz, C,

14. ## science

What do you mean by mechanical advantage if simple machine is2

15. ## Mathematics

The probability of a seed germinating 113.if three of the seeds are planted what is the probability that none germinate

16. ## Calculus

Find all the first and second order partial derivatives of the function f(x,y) = 2x^3+ 3x^2 y^2 + 3x + 2/y + 4

17. ## mathematics

A Square ABCD inscribed in a circle of radius 4cm. What is the minor segment cut off by the chord AB

18. ## mathematics

Which system of equations can be graphed to find the solution(s) to x2 = 2x + 3?

19. ## Calculus

Find the equation of the line passing through the pointsP1( 1, 2, 1) and P2( 2,3,2).

20. ## math

How much is Zone five dollar bill, seven quarters, and six dimes?

21. ## Algebra

hello! I am nine years old, and I have a question. This is my question. Evaluate the expression when c=5 and d=45 d-6c=??? I don't know how to do it. Can you help me? Thanks!

22. ## chemistry

What is solid?

23. ## Spanish

How do you say good morning in spanish?

24. ## Physics

Your family is moving to a new apartment. While lifting a box 1.5 m straight up to put it on a truck, you exert an upward force 300 N for 1.0 s. How much power is required to do this? Do I work this like this or? P = W/t W= 300N. 1.5m*cos(0)=400J

25. ## physics

a spring 20cm long is stretched to 40cm by a load of 50n .what is 1.the length when stretched by 100n 2.what is the work done when stretched by 100n

26. ## science

A boat start sailing on Monday 10:00 at harbour A and sails 600km due north. Later it turns east for a further 420km to reach harbour B on Tuesday at 12:00..calculate the average velocity of the trip

27. ## Science

.A uniform metre rule balances horizontally on a knife edge placed at the 58 cm mark when a weight of 20gf is suspended from one end. what is the weight of the rule? *

28. ## Math

The measure of angle B is 124 degrees. What is the measure of its supplementary angle?

29. ## algebra

y=sqrt(4-x^2) I have a trouble finding range, I used the inverse to find worked out to be y=2 but the answer is [0,2] my question is how do I found 0 in [0,2]?

30. ## history

Do you think the writers of the Constitution believed one was the branch of government more important?

31. ## Math

I guess I'm not following the below example Reiny answered previously. The reason for my confusion is if a coin has been removed, it stays removed, does it not? So how can you have a 1/16 chance on the second draw? If one coin has been removed, the second

32. ## Mathematics

A man traveled from point A to point B at a bearing of 60 degress from point A, calculate the bearing of point A from point B

33. ## physics

three forces of magnitude 6N, 2N and 3N act on a small object in directions north, south and west respectively, find magnitude of the resultant force

34. ## Probability

A police radar unit is set up to monitor vehicles on a stretch of highway with a speed limit of 100 km/h. Long-term records for this location show that speeds vary normally with a mean of 105 km/h and a standard deviation of 7 km/h. Drivers who exceed the

35. ## Chemistry

The pressure of a sample of argon gas was increased from 3.71 atm to 8.55 atm at constant temperature. If the final volume of the argon sample was 16.1 L, what was the initial volume of the argon sample? Assume ideal behavior.

36. ## math

What power is expended by a weightlifter when lifting a 56-kg barbell a vertical distance of 1.0 m in a time interval of 1.4 s . Express your answer to two significant figures and include the appropriate units.