Questions and Answers of Physics Everyday Phenomena

A car starts from rest, accelerates uniformly for 5 seconds, travels at constant velocity for 5 seconds, and finally decelerates uniformly for 5 seconds. Sketch graphs of velocity versus time and
A car traveling in the forward direction experiences a negative uniform acceleration for 10 seconds. Is the distance covered during the first 5 seconds equal to, greater than, or less than the
For a uniformly accelerated car, is the average acceleration equal to the instantaneous acceleration? Explain.
The velocity-versus-time graph of an object curves as shown in the diagram. Is the acceleration of the object constant? Explain. Q26 Diagram
When a car accelerates uniformly from rest, which of these quantities increases with time: acceleration, velocity, and/or distance traveled? Explain.
Suppose that the acceleration of a car increases with time. Could we use the relationship v = v0 + at in this situation? Explain
Look again at the velocity-versus-time graph for the toy car shown in figure 2.15.a. Is the instantaneous speed greater at any time during this motion than the average speed for the entire trip?
For the car whose velocity is plotted in question 21, in which of the equal time segments 0–2 seconds, 2–4 seconds, or 4–6 seconds, is the distance traveled by the car the greatest? Explain.
A car moves along a straight section of road so that its velocity varies with time as shown in the graph.a. Does the car ever go backward? Explain.b. At which of the labeled points on the graph, A,
For the car whose distance is plotted against time in question 19, is the velocity constant during any time interval shown in the graph? Explain.
A car moves along a straight line so that its position (distance from some starting point) varies with time as described by the graph shown here.a. Does the car ever go backward? Explain.b. Is the
In the graph shown here, velocity is plotted as a function of time for an object traveling in a straight line.a. Is the velocity constant for any time interval shown? Explain.b. During which time
A racing sports car traveling with a constant velocity of 100 MPH due west startles a turtle by the side of the road who begins to move out of the way. Which of these two objects is likely to have
A car traveling with constant speed rounds a curve in the highway. Is the acceleration of the car equal to zero in this situation? Explain.
A car just starting up from a stop sign has zero velocity at the instant that it starts. Must the acceleration of the car also be zero at this instant? Explain.
At a given instant in time, two cars are traveling at different velocities, one twice as large as the other. Based upon this information is it possible to say which of these two cars has the larger
A driver of a car steps on the brakes, causing the velocity of the car to decrease. According to the definition of acceleration provided in this chapter, does the car accelerate in this process?
A dropped ball gains speed as it falls. Can the velocity of the ball be constant in this process? Explain.
A ball tied to a string fastened at the other end to a rigid support forms a pendulum. If we pull the ball to one side and release it, the ball moves back and forth along an arc determined by the
A ball attached to a string is whirled in a horizontal circle such that it moves with constant speed.a. Does the velocity of the ball change in this process? Explain.b. Is the acceleration of the
A ball is thrown against a wall and bounces back toward the thrower with the same speed as it had before hitting the wall. Does the velocity of the ball change in this process? Explain.
The highway patrol sometimes uses radar guns to identify possible speeders and at other times uses associates in airplanes who note the time taken for a car to pass between two marks some distance
Is the average speed over several minutes more likely to be close to the instantaneous speed at anytime for a car traveling in freely flowing, low-density traffic or for one traveling in high-density
Does the speedometer on a car measure average speed or instantaneous speed? Explain.
A driver states that she was doing 80 when stopped by the police. Is that a clear statement? Would this be interpreted differently in England than it would be in the United States? Explain.
A tortoise and a hare cover the same distance in a race. The hare goes very fast for brief intervals, but stops frequently, whereas the tortoise plods along steadily and finishes the race ahead of
What units would have an appropriate size for measuring the rate at which fingernails grow? Explain.
Suppose that we choose inches as our basic unit of distance and days as our basic unit of time.a. What would the units of velocity and acceleration be in this system? Explain.b. Would this be a good
Suppose that critters are discovered on Mars who measure distance in boogles and time in bops.a. What would the units of speed be in this system? Explain.b. What would the units of velocity be?
Look around your house, car, or dormitory room to see what measuring tools (rulers, measuring cups, speedometers, etc.) you have handy. Which of these tools, if any, provides both English and metric
An energy-efficient bulb claims to have the brightness of a 75W bulb but only uses 15W of electrical power. a. If you have this light bulb on for 5 hours a day, for 350 days during a year, how
In the United States a common quantity of hard liquor was historically a fifth, which represents a fifth of a US gallon. However, since the US wants to market its alcohol globally, and everyone else
Astrologers claim that they can predict important events in your life by the configuration of the planets and the astrological sign under which you were born. Astrological predictions, called
A common speed limit in Vancouver, British Columbia, is 80 km/hr. If you are going 55 MPH, are you speeding? Show by converting 55 MPH to km/hr using the conversion factors on the inside front cover.
The area is found by multiplying the length of a surface times the width. If a floor measures 6.25 m2, how many square centimeters does this represent? How many square centimeters are there in 1 m2?
If a mile is 5280 ft long and a yard contains 3 ft, how many yards are there in a mile?
A mile is 5280 ft long. The sample exercise in example box 1.2 shows that 1 foot is approximately 0.305 m. How many meters are there in a mile? How many kilometers (km) are there in a mile?
A tank holds 2.18 kL (kiloliters) of water. How many liters is this? How many milliliters?
A crate has a mass of 8.60 kg (kilograms). What is this mass in grams? In milligrams?
A woman’s foot is 9 inches long. If she steps off the length of a room by placing one foot directly in front of the other, and finds the room to be 15 foot-lengths long, what is the length of the
A man uses his hand to measure the width of a tabletop. If his hand has a width of 12 cm at its widest point, and he finds the tabletop to be 10.5 hands wide, what is the width of the tabletop in cm?
It is estimated that six large pizzas are about right to serve a physics club meeting of 30 students. How many pizzas would be required if the group grows to 50 students?
Suppose that a cupcake recipe designed to produce twelve cupcakes calls for 900 mL of flour. How many milliliters of flour would you use if you wanted to make only eight cupcakes?
Suppose that a pancake recipe designed to feed three people calls for 600 mL of flour. How many milliliters of flour would you use if you wanted to extend the recipe to feed five people?
Which of these criteria best distinguish between explanations provided by science and those provided by religion: truth, testability, or appeal to authority? How do religious explanations differ from

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