# Questions Asked onJune 13, 2020

1. ## chemistry

Ethanol (C2H5OH) melts at -114 °C. The enthalpy of fusion is 5.02 kJ/mol. The specific heats of solid and liquid ethanol are 0.97 J/g-K and 2.3 J/g-K, respectively. How much heat (kJ) is needed to convert 25.0 g of solid ethanol at -125 °C to liquid

2. ## precalculus

please can somebody explain to me how to do this questions 8. Elli travelled 700km by truck to deliver some ostriches to her friend's farm. she then returned the same distance by car. The car averaged 10km/h faster than the truck and took 1 hour less time.

3. ## Mathematics

(1). An Aeroplane leaves an airport, flies due North for 2 hrs at 500km/h. It then flies on a bearing of 053 degree at 300km/h for 90 mins. How far is the plane from the airport correct to 1 dp (2). Find the bearing of the plane from the Airport correct to

4. ## Math

Sarah holds a bond for 5 years that has a 5.7% percent coupon rate and a \$100 par value. How much interest does Sarah earn in 4 years? \$285 \$82 \$258 \$228

5. ## Science

State the effects of over-secretion and under-secretion of somatotrophin,thyroxine,insulin,ADH,oestrogen,testrosterone.

6. ## Physics

During the compression stroke of a certain gasoline engine, the pressure increases from 2atm to 15atm. If the process is adiabatic and the fuel–air mixture behaves as a diatomic ideal gas, by what factor does the volume change?

7. ## precalculus

hello please help with this. i can't understand how to complete these questions 2. The height, H meters, of a falling object is related to the time, t seconds, the object has been falling by the formula h=-4.9t^2+d , where d meters is the initial height of

8. ## Math

On a \$8400 loan at 7%, what would the monthly payment be for 36 months?

9. ## Chemistry

What mass of Ca(OH)2 is required to prepare 200mL of 0.2N solution?

10. ## Mathematics

A manufacturer of light bulbs has sampled 25 bulbs in order to determine the population mean life of the bulbs. The sample mean was 1200hrs with a standard deviation of 100. The manufacturer would like to know with 95% confidence, the internal values for

11. ## math

What is the alternative angular bracket notation? Can somebody gives me an example of it?

12. ## Chemistry

75.0 mL 0.060 M NaF and 25 mL 0.150 M Sr (NO3) 2 are mixed. Calculate the Q. For SrF2 Kc = 2.0 x 10-10

13. ## Mathematics

Find the number of ways,the digits 0,1,2,3 can be permuted to give rise to a number greater than 2000.

14. ## Physics

A steam engine is being planned that is to use steam at 400 ˚F and whose efficiency is to be 20 percent. Find the maximum temperature at which the spent steam can emerge.

15. ## Mathematics

Consider a spherical tank of radius 4 m that is filling with water. Let V be the volume of water in the tank (in cubic meters) at a given time, and h the depth of the water (in meters) at the same time. It can be shown using calculus that V is a function

16. ## calculus

Does 5k cross 2j=-10i or +10i?

17. ## Mathematics

A man driving a car leaves a point A drives up to 32.5 km in a direction of 070. A cyclist leaves the same point in a direction 130 travelling. After some few hours both drivers are 80km apart. Use this information to answer 3 questions. (1). What is the

18. ## Geometry

I need some help. ABC = 8x - 10, and I'm supposed to find the measurements of ABD, and DBC.

19. ## Algebra

What is the probability that if you draw a card from a standard deck of cards that it is a card of Diamonds or an 8 ?

20. ## MATH

How many lines through the origin make angles of 60degree with both the +y and +z axes ? What angle do they make with the +x axis ?

21. ## Algebra

Find the perimeter of the outside of the hungry circle monster below assuming the angle of its mouth is radians pi/3 and its radius is 7 inches .