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physics
physics everyday phenomena
Physics of Everyday Phenomena A conceptual Introduction to physics 6th edition W. Thomas Griffith, Juliet W. Brosing - Solutions
A car travels with an average speed of 58 MPH. What is this speed in km/h?
A car travels with an average speed of 22 m/s.a. What is this speed in km/s?b. What is this speed in km/h?
A hiker walks with an average speed of 1.2 m/s. What distance in kilometers does the hiker travel in a time of 1 hour?
A person in a hurry averages 62 MPH on a trip covering a distance of 300 miles. What time was required to travel that distance?
A woman walks a distance of 240 m with an average speed of 1.2 m/s. What time was required to walk this distance?
A driver drives for 2.5 hours at an average speed of 54 MPH. What distance does she travel in this time?
Grass clippings are found to have an average length of 4.8 cm when a lawn is mowed 12 days after the previous mowing. What is the average speed of growth of this grass in cm/day?
A walker covers a distance of 1.8 km in a time of 30 minutes. What is the average speed of the walker for this distance in km/h?
A traveler covers a distance of 460 miles in a time of 8 hours. What is the average speed for this trip?
A physics instructor walks with increasing speed across the front of the room then suddenly reverses direction and walks backward with constant speed. Sketch graphs of velocity and acceleration consistent with this description.
Suppose that two runners run a 100-meter dash, but the first runner reaches maximum speed more quickly than the second runner. Both runners maintain constant speed once they have reached their maximum speed and cross the finish line at the same time. Which runner has the larger maximum speed?
Suppose that two runners run a 100-meter dash, but the first runner reaches maximum speed more quickly than the second runner. Both runners maintain constant speed once they have reached their maximum speed and cross the finish line at the same time. Which runner has the larger maximum speed?
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 acceleration versus time for this situation
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 distance covered during the second 5 seconds? Explain.
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? Explain.b. Is the car accelerated when the direction of the car is reversed at t = 50 s? Explain.
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, B, or C, is the magnitude of the acceleration the greatest? Explain.
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 instantaneous velocity at point A greater or less than that at point B? Explain. Q19 Diagram
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 interval is shown does the object have the greatest acceleration? Explain. 2 4 8 t (s) Q18 Diagram
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 the larger acceleration at that instant? Explain
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 acceleration at this instant in time? Explain
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? Explain.
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 string length.a. Is the velocity constant in this process? Explain.b. Is the speed likely to be
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 ball equal to zero? Explain.
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 apart on the highway. What do each of these methods measure, average speed or instantaneous ed? Can
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 traffic? Explain.
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 the hare.a. Which of the two racers has the greater average speed over the duration of the race?
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 choice of units for measuring the acceleration of an automobile? Explain.
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? Explain.c. What would the units of acceleration be? Explain.
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 units? For those that do, determine the conversion factor needed to convert the English units to
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 many hours is it on? b. A kilowatt is 1000 watts. The kilowatt-hour is a common unit for energy,
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 uses the metric system, it has retooled its packaging, so a common quantity is now 750 ml.a. How
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 horoscopes, can be found in most daily newspapers. Find these predictions in a newspaper and address the
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 room in inches? In feet?
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? In meters?
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 scientific explanations?
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