A company is willing to renew its advertising contract with a local radio station only if the station can prove that more than 20% of the residents of the city have heard the ad and recognize the company’s product. The radio station conducts a random phone survey of 400 people. a) What are the hypotheses? …
Which newspaper features distinctive portraits called “dot-drawings” instead of actual photos? Answer The Wall Street Journal still uses dot drawings instead of actual photos. They began producing these dot drawings in 1979 and call them Hedcuts. Newspaper cartoons are a powerful means of gripping the attention of a large number of readers. It’s the pictures …
Which compound would you expect to have greater surface tension: acetone [(CH3)2CO] or water (H2O)? Explain. Answer: Tension of water is higher than acetone. Explanation Intermolecular bonds between multiple water molecules are hydrogen bonds, since water has a hydrogen atom attached to an electronegative atom (oxygen), and that hydrogen atom binds to an oxygen atom …
Which of the following is NOT true of deep ocean trenches? (A) They are long and narrow depressions in the ocean floor. (B) They are sites where plates plunge back into the mantle. (C) They are geologically very stable. (D) They may act as sediment traps. Answer: C. They are geologically very stable. Explanation A …
Which Of The Following Is Not True Of Deep Ocean Trenches? Read More »
Describe the three parts of an ATP molecule. Answer Adenosine triphosphate (ATP) is a chemical compound which serves as the chemical fuel of living organisms. ATP is composed of adenine, ribose, and 3 phosphate groups. At the center of the ATP is the sugar molecule called ribose. There is an adenine attached to one side …
The piston of a hydraulic automobile lift is 0.30 m in diameter. What gauge pressure, in pascals, is required to lift a car with a mass of 1200 kg? Also express this pressure in atmospheres. Answer: 1.7 atm
A 1130-kg car is held in place by a light cable on a very smooth (frictionless) ramp. The cable makes an angle of 31.0°C above the surface of the ramp, and the ramp itself rises at 25.0°C above the horizontal. (a) Draw a free-body diagram for the car. (b) Find the tension in the cable. …
How Hard Does The Surface Of The Ramp Push On The Car? Read More »
What three guidelines help management accountants provide the most value to managers? Answer Three guidelines that help management accountant to provide the most value to managers are: (1) employ a cost\u2013benefit approach, (2) give full recognition to behavioral and technical considerations, and (3) use different costs for different purposes. Cost-Benefit Approach: Managers continually face resource-allocation …
What Three Guidelines Help Management Accountants Provide The Most Value To Managers? Read More »
Find a vector function that represents the curve of intersection of the two surfaces. The cylinder x^2+y^2=4 and the surface z=xy Answer: r(t) = 2 sin t, 2 cos t, 2 sin 2t. Explanation Rationalization. We know that one way of the parametrization of a circle of radius r in R^2 centered at the origin …
An oscillator creates periodic waves on a stretched string. a. IF the period of the oscillator doubles, what happens to the wavelength and wave speed? The wavelength doubles but the wave speed is unchanged. The wavelength is halved but the wave speed is unchanged. The wavelength is unchanged but the wave speed doubles. b. If …
If The Period Of The Oscillator Doubles, What Happens To The Wavelength And Wave Speed? Read More »
There is a common misconception that traditional taxonomy is based on morphology, while cladistics is based on genetic data. How is this misconception incorrect? Answer Taxonomy is a branch of science that specializes in classification, especially in the classification of organisms. Cladistics is an approach to the classification of organisms in biology. The method uses …
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Verify that each given function is a solution of the differential equation. ty’−y=t2; y=3t+t2 Answer We have differentiated y(t) Plug the values of y(t) and y'(t) in the given differential equation. y is a solution of a given differential equation.
Calculate the ratio of effusion rates for Ar and Kr. Answer Mar = 39.948 g/mol – Determine the molar mass of argon. Mkr – 83.798 g/mol – Determine the molar mass of krypton. Substitute these molar masses into Graham’s law to determine the ratio of effusion rates.
A rectangular package to be sent by a postal service can have a maximum combined length and girth (perimeter of a cross-section) of 108 inches. Find the dimensions of the package of maximum volume that can be sent. (Assume the cross-section is square.) Answer 108 – 4x*y 108-4x=y There is a max at x = …
What is the preferred steering method to help reduce the possibility of losing control? A. One-hand steering B. Hand-over-Hand Steering C. Push-pull steering D. No hand steering Answer: Push-pull steering is the preferred steering method to help reduce the possibility of losing control. Explanation To assist decrease the likelihood of losing control, the push-pull steering …
What Is The Preferred Steering Method To Help Reduce The Possibility Of Losing Control? Read More »
Find dy/dx by implicit differentiation. xe^y = x – y Answer
A boat has a mass of 6800 kg. Its engines generate a drive force of 4100 N, due west, while the wind exerts a force of 800 N, due east, and the water exerts a resistive force of 1200 N due east. What is the magnitude and direction of the boat’s acceleration? Answer a = …
A 5.0 kg dog sits on the floor of an elevator that is accelerating downward at 1.20m/s^2. a. What is the magnitude of the normal force of the elevator floor on the dog? A. 34 N B. 43 N C. 49 N D. 55 N E. 74 N Answer A) B B) D Explanation Given …
Suppose we are testing Ho: p=.20 vs Ha: p>.20 and TS=2.34. What is the p-value? Answer Given (TS = test statistic z) The P-value is the probability of obtaining the value of the test statistic, or a value more extreme when the null hypothesis is true. Determine the P-value using the normal probability table in …
Assume that 30% of students at a university wear contact lenses. a) We randomly pick 100 students. Let p^ represent the proportion of students in this sample who wear contacts. What’s the appropriate model for the distribution of p^? Specify the name of the distribution, the mean, and the standard deviation. Be sure to verify …
Assume That 30 Of Students At A University Wear Contact Lenses Read More »
