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Chapter 2: Q17. (page 43)
A sports car accelerates from rest to 95 km/h in 4.3 s. What is its average acceleration in ?
The acceleration of the car is .
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Which of the following should be a part of solving any problem in physics? Select all that apply:
Read the problem carefully.
Draw a picture of the situation.
Write down the variables that are given.
Think about which physics principles to apply.
Determine which equations can be used to apply the correct physics principles.
Check the units when you have completed your calculation.
Consider whether your answer is reasonable.
For an object falling freely from rest, show that the distance traveled during each successive second increases in the ratio of successive odd integers (1, 3, 5, etc.). (This was first shown by Galileo.) See Figs. 2鈥�19 and 2鈥�22.
Pelicans tuck their wings and free-fall straight down while diving for fish. Suppose a pelican starts its dive from a height of 14.0 m and cannot change its path once committed. If it takes a fish 0.20 s to perform an evasive action, at what minimum height must it spot the pelican to escape? Assume that the fish is at the surface of the water.
Question: A ball is thrown straight up. What are the velocity and acceleration of the ball at the highest point in its path?
(a) .
(b) up.
(c) down.
(d) .
(e) .
As a freely falling object speeds up, what is happening to its acceleration 鈥揹oes it increase, decrease, or stay the same? (a) Ignore air resistance. (b) Consider air resistance.
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