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(Solved) 11. How much time will it take a car travelling at 88 km/hr (55 mi/hr) to travel 500km?


11. How much time will it take a car travelling at 88 km/hr (55 mi/hr) to travel 500km?  Show work for credit and include final units.

12.  During a race, a runner runs at a speed of 6 m/s. 2 seconds later, she is running at a speed of 10 m/s. What is the runner’s acceleration? Show your work.

14.  If you push a 900N refrigerator with the same force as you lift a 40N dumbbell, the dumbbell will move faster.  According to Chapter 12, which of Newton’s laws is this an example of?  Explain how you know.

15.  How does the strength of an electromagnet depend on the current and the number of turns in the coil?

19. A small dog is trained to jump straight up a distance of 1.2 m. How much kinetic energy does the 7.2-kg dog need to jump this high? (The acceleration due to gravity is 9.8 m/s2.) Show your work for credit.

20. As 390 g of hot milk cools in a mug, it transfers 30,000 J of heat to the environment. What is the temperature change of the milk? The specific heat of milk is 3.9 J/g·°C. Show your work for credit.

21.  Thermal conductors don’t have to be hot to transfer heat.  According to Ch.16, explain a situation when an ice cube would still transfer heat to another object it is in contact with. 


24.  In the bottom wave, how many complete wavelengths are there from 0 – 25 on the x axis?

25.  Explain why the speed of sound is faster in solids than in gases.  Include two other factors Chapter 17 says the speed of sound can depend on.

26.  Which waves have wavelengths longer than those of visible light? Give an example of how each kind of wave is used.


32. Based on how the book describes a heat pump in Sec 16.3, how does a heat pump prove the law of conservation of energy?  Hint: think about a refrigerator.   

33.  A bird flies from the South Pole to the North Pole.  Part of the journey is 1000 miles that takes 2 weeks.  What is the bird’s velocity in that time?  Show work for credit and include final units.

 


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