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college physics with an integrated approach

Questions and Answers of College Physics With An Integrated Approach

If the trajectory is parabolic in one reference frame, is it always, never, or sometimes parabolic in another reference frame that moves at constant velocity with respect to the first reference
A woman stands on a bathroom scale in an elevator that is not moving. The scale reads 500 N. The elevator then moves downward at a constant velocity of 4.5 m/s. What does the scale read while the
A typical sneeze expels material at a maximum speed of 44 m/s. Suppose the material begins inside the nose at rest, 2.0 cm from the nostrils. It has a constant acceleration for the first 0.25 cm and
A car is speeding up and has an instantaneous velocity of 1.0 m/s in the +x-direction when a stopwatch reads 10.0 s. It has a constant acceleration of 2.0 m/s2 in the +x-direction. (a) What is
A small plane climbs with a constant velocity of 250 m/s at an angle of 28° with respect to the horizontal. Which statement is true concerning the magnitude of the net force on the plane?(a) It is
A thin string that can withstand a tension of 35.0 N, but breaks under any larger tension, is attached to the ceiling of an elevator. How large a mass can be attached to the string if the initial
What force(s) act on a parachutist descending to Earth with a constant velocity? What is the acceleration of the parachutist?
A person stands on the roof garden of a tall building with one ball in each hand. If the red ball is thrown horizontally off the roof and the blue ball is simultaneously dropped over the edge, which
What does it mean when we refer to a cord as an “ideal cord” and a pulley as an “ideal pulley”?
A pilot without special training or equipment can tolerate a horizontal acceleration of up to about 9g for a short period of time (about a minute) without losing consciousness. (a) How long
A ball is thrown into the air and follows a parabolic trajectory. Point A is the highest point in the trajectory and B is a point as the ball is falling back to the ground. Choose the correct
An object is placed on a scale. Under what conditions does the scale read something other than the object's weight, even though the scale is functioning properly and is calibrated correctly? Explain.
A ball is thrown into the air and follows a parabolic trajectory. At the highest point in the trajectory,(a) The velocity is zero, but the acceleration is not zero.(b) Both the velocity and the
Why does a 1 kg sandbag fall with the same acceleration as a 5 kg sandbag? Explain in terms of Newton's second law and his law of gravitation.
Two balls, identical except for color, are projected horizontally from the roof of a tall building at the same instant. The initial speed of the red ball is twice the initial speed of the blue ball.
A kicker kicks a football from the 5 yard line to the 45 yard line (both on the same half of the field). Ignoring air resistance, where along the trajectory is the speed of the football a minimum?(a)
Four objects move to the right with constant acceleration. Rank the motion diagrams in order of the magnitude of the acceleration, from greatest to least. The time interval between dots is the same
A ball is thrown straight up into the air. Ignore air resistance. While the ball is in the air, its acceleration (a) Increases.is zero.(b) Remains constant.(c) Decreases on the way up and
A leopard starts from rest at t = 0 and runs in a straight line with a constant acceleration until t = 3.0 s. The distance covered by the leopard between t = 1.0 s and t = 2.0 s is the (a)
Anthony is going to drive a flat-bed truck up a hill that makes an angle of 10° with respect to the horizontal direction. A 36.0 kg package sits in the back of the truck. The coefficient of static
Paula swims across a river that is 10.2 m wide. She can swim at 0.833 m/s in still water, but the river flows with a speed of 1.43 m/s. If Paula swims in such a way that she crosses the river in as
Harrison traveled 2.00 km west, then 5.00 km in a direction 53.0° south of west, then 1.00 km in a direction 60.0° north of west. (a) In what direction, and for how far, should Harrison travel
A motorcycle is speeding on a straight, level highway at constant speed. At t = 0, the motorcycle passes a police car that is initially at rest. The officer gives chase, but the motorcyclist
A sample in a centrifuge moves in a circle of radius 8.0 cm at a constant speed of 500 m/s. (a) How much time does it take for the velocity’s direction to change by 45° (1/8 of a
How far does the object move from t = 0 to t = 3 s?A bicycle is moving along a straight line. The graph shows its position from the starting point as a function of time. Consider the 1 s time
Rank the time intervals in order of decreasing velocity vx, from largest positive to largest negative.A bicycle is moving along a straight line. The graph shows its position from the starting point
To pass a physical fitness test, Marcella must run 1.00 km at an average speed of 3.33 m/s. She runs the first 0.500 km at an average of 4.20 m/s. What should be her average speed over the remaining
Rank the time intervals in order of increasing speed.A bicycle is moving along a straight line. The graph shows its position from the starting point as a function of time. Consider the 1 s time
Rank the time intervals in order of increasing displacement, from largest negative to largest positive.A bicycle is moving along a straight line. The graph shows its position from the starting point
Fish don’t move as fast as you might think. A small trout has a top swimming speed of only about 2 m/s, which is about the speed of a brisk walk (for a human, not a fish!). It may seem to move
(a) If a freestyle swimmer travels 1.50 km in a time of 14 min 53 s, how fast is his average speed? (b) If the pool is rectangular and 50 m in length, how does the speed you found compare with
Samantha goes kayaking on a straight river. After she has paddled upstream for a while, she realizes she dropped a lifejacket overboard when she launched so she turns around and paddles downstream to
One of the tricky things about learning to sail is distinguishing the “true wind” from the “apparent wind.” The true wind is the velocity of the air relative to the water, whereas the
A spotter plane sees a school of tuna swimming at a steady 5.00 km/h northwest. The pilot informs a fishing trawler, which is just then 100.0 km due south of the fish. The trawler sails along a
Beatrice needs to drag her suitcase again. This time she pulls with a force of 105 N at 38.0° with the horizontal. The coefficients of static and kinetic friction between the suitcase and the floor
In a plate glass factory, sheets of glass move along a conveyor belt at a speed of 15.0 cm/s. An automatic cutting tool descends at preset intervals to cut the glass to size. Since the assembly belt
A small plane is flying directly west with an airspeed of 30.0 m/s. The plane flies into a region where the wind is blowing at 10.0 m/s at an angle of 30° to the south of west. (a) If the pilot
An accelerometer—a device to measure acceleration—can be as simple as a small pendulum hanging in an airplane cockpit. An essentially similar accelerometer is found in the inner ear of
An airplane has a velocity relative to the ground of 210 m/s toward the east. The pilot measures his airspeed (the speed of the plane relative to the air) to be 160 m/s. What is the minimum wind
In Fig. 3.39, two blocks are connected by a lightweight cord that does not stretch and that passes over an ideal pulley. (a) If m1 = 3.0 kg and m2 = 5.0 kg, what are the accelerations of each
While an elevator of mass 2530 kg moves upward, the tension in the cable is 33.6 kN. (a) What is the acceleration of the elevator?(b) If at some point in the motion the velocity of the elevator
A 2010 kg elevator moves with a downward acceleration of 1.50 m/s2. What is the tension in the cable that supports the elevator?Assume the elevator is supported by a single cable. Forces exerted by
A 2010 kg elevator moves with an upward acceleration of 1.50 m/s2. What is the tension in the cable that supports the elevator?Assume the elevator is supported by a single cable. Forces exerted by
In Fig. 3.30 an astronaut is playing shuffleboard on Earth. The puck has a mass of 2.0 kg. Between the board and puck the coefficient of static friction is 0.35 and that of kinetic friction is
In each motion diagram, the dots are labeled with the “frame” number (frame 1 is the first position of the object). Choose the x-axis pointing to the right. For each diagram, sketch graphs of
Five objects all start from rest at t = 0. Each is pushed to the right by a constant net force. Rank the objects according to their speeds at the instants of time indicated, from largest to
In a binary star system, two stars orbit their common center of mass.In one such system, star A has 4.0 times the mass of star B. (a) Draw and label vector arrows for the gravitational forces
Draw a motion diagram and sketch graphs of x(t), vx(t), and ax(t) for a sprinter running a short race on a straight track, from just before the start of the race until the sprinter has stopped after
An automobile is traveling along a straight road to the southeast at 24 m/s when the driver sees a deer begin to cross the road ahead of her. She steps on the brake and brings the car to a complete
A tennis ball (mass 57.0 g) moves toward the player’s racquet at 47.5 m/s. It is in contact with the racquet for 3.60 ms, after which it moves in the opposite direction at 50.2 m/s. What is the
A 1200 kg airplane starts from rest and, with a constant acceleration of magnitude 5.0 m/s2, reaches its takeoff speed in 9.00 s. (a) What is the magnitude of the net force on the airplane
The graph shows vx versus t for an object moving along the x-axis. (a) What is ax at t = 11 s? (b) What is ax at t = 3 s? (c) Sketch a graph of ax(t). (d) How far does the object
An 1100 kg airplane starts from rest and accelerates horizontally forward for 8.0 s until it reaches its takeoff speed of 35 m/s. What is the average net force on the airplane during this time?
The graph with Problem 24 shows vx(t) for a skateboard moving along the x-axis. Rank the times t = 0.5 s, 1.5 s, 2.5 s, 3.5 s, 4.5 s, and 5.5 s, in order of the magnitude of the acceleration, from
If a car (mass 1200 kg) traveling at 28 m/s is brought to a full stop in 4.0 s after the brakes are applied, find the average frictional force exerted on the car.
(a) One of the fastest land animals of North America is the pronghorn antelope. (a) If a pronghorn antelope accelerates from rest in a straight line with a constant acceleration of 1.7 m/s2, how much
A sailor climbs the mast in a bosun’s chair to make an emergency repair while the boat is moving forward at a steady 3.0 m/s (5.8 knots). At the top of the mast, he drops his wrench. If air
A graph is plotted of the vertical velocity component vy of an elevator versus time. The y-axis points up. (a) How high is the elevator above the starting point (t = 0) after 20 s have
The graph shows vx in meters per second versus t in seconds for a skateboard moving along the x-axis. How far does the board move between t = 3.00 s and t = 8.00 s? Sketch a motion diagram and a
The graph shows x(t) for an object traveling along the x-axis. Plot vx as a function of time for this object from t = 0 to t = 8 s.
Speedometer readings are obtained and graphed as a car skids to a stop along a straight-line path. How far does the car move between t = 0 and t = 16 s? Sketch a motion diagram showing the position
A boy plans to cross a river in a rubber raft. The current flows from north to south at 1 m/s. In what direction should he head to get across the river to the east bank in the least amount of time if
A boy plans to paddle a rubber raft across a river to the east bank while the current flows down river from north to south at 1 m/s. He is able to paddle the raft at 1.5 m/s in still water. In what
Give a real example of the motion of some object for which: (a) The velocity and net force are in the same direction; (b) The velocity and net force are in opposite directions; (c) The
The four graphs show vx versus time. Which graph shows a changing ax that is always positive?
While you are supervising playground activity during recess, the children are playing a game of tag. As Marlene and Shelly run past each other in opposite directions, Marlene reaches out and touches
Two cars, a Porsche Boxster convertible and a Toyota Scion xB, are traveling at constant speeds in the same direction, although the Boxster is 186 m behind the Scion. The speed of the Boxster is 24.4
The four graphs show vx versus time. Which graph shows ax constant and negative? (a) (b) (d)
You are given the task of designing a mechanism to trip a switch in an automobile seat belt, causing it to tighten in case of an accident. You decide that if the velocity of the car is high and
Jason drives due west with a speed of 35.0 mi/h for 30.0 min, continues in the same direction with a speed of 60.0 mi/h for 2.00 h, and then drives farther west at 25.0 mi/h for 10.0 min. What is
The four graphs show vx versus time. Which graph shows ax constant and positive? (a) (b) (d)
For the train in Fig. 3.2 and Example 3.3, find the average velocity between 3:14 P.M. when the train is at 3 km east of the origin and 3:28 P.M. when it is 10 km east of the origin.In Figure 3.2
An object is subjected to two constant forces that are perpendicular to each other. Can a set of x- and y-axes be chosen so that the acceleration of the object has only one nonzero component? If so,
The four graphs show vx versus time. Which graph shows a constant velocity? (a) (b) (P)
Refer to Conceptual Question 17 in Chapter 2. A heavy lead ball hangs from a string attached to a sturdy wooden frame. A second string is attached to a hook on the bottom of the lead ball. In Chapter
Repeat Problem 8 using the component (algebraic) method.A scout troop is practicing its orienteering skills with map and compass. First they walk due east for 1.2 km. Next, they walk 45° west of
Mechanical advantage is the ratio of the force required without the use of a simple machine to that needed when using the simple machine. Compare the force to lift an object with that needed to slide
Rank, in order of increasing x-component, and in Problem 4. The x-axis points to the right. Explain your reasoning. A + B B + C.
Crate of potatoes of mass 18.0 kg is on a ramp with angle of incline 30° to the horizontal. The coefficients of friction are μs = 0.75 and μk = 0.40. Find the normal force (magnitude)
With the y-axis pointing north, rank vectors and F(vector) in Problem 8 in order of increasing y-component. Explain your reasoning. D, E-
A study was done observing the ability of the eye to rapidly rotate in order to follow a moving object by placing contact lenses that contain accelerometers on a subject’s eye. The eyeball has
A “blink of an eye” is a time interval of about 150 ms for an average adult. The “closure” portion of the blink takes only about 55 ms. Let us model the closure of the upper eyelid as uniform
A clothes washer reaches an angular speed of 1400 rev/min in 2.0 s, starting from rest, during the spin cycle. (a) Assuming the angular acceleration is constant, what is its magnitude? (b)
A hamster of mass 0.100 kg gets into its exercise wheel and starts to run at t = 0. After t = 0.800 s, the wheel turns with a constant rotational frequency of 1.00 Hz. What is the tangential
A pendulum is 0.80 m long, and the bob has a mass of 1.0 kg. At the bottom of its swing, the bob’s speed is 1.6 m/s. (a) What is the tension in the string at the bottom of the swing? (b)
The orbital speed of Earth about the Sun is 3.0 × 104 m/s and its distance from the Sun is 1.5 × 1011 m. The mass of Earth is approximately 6.0 × 1024 kg and that of the Sun is 2.0 ×
A curve in a stretch of highway has radius 610 m. The road is banked at angle 5.8° to the horizontal. The coefficient of static friction between the tires and road is 0.50. What is the fastest speed
A road with a radius of 75.0 m is banked so that a car can navigate the curve at a speed of 15.0 m/s without any friction. On a cold day when the street is icy, the coefficient of static friction
A roller coaster car of mass 320 kg (including passengers) travels around a horizontal curve of radius 35 m. Its speed is 16 m/s. (a) What are the magnitude and direction of the total force
Medical testing has established that the maximum acceleration a pilot can be subjected to without losing consciousness is approximately 5.0g if the axis of acceleration is aligned with the spine. A
Rank the flywheels of Problems 11 and 12 in order of the radial acceleration of a point on the rim, largest to smallest.Five flywheels are spinning as follows: (a) Radius 8.0 cm, period 4.0
Rank the flywheels in order of the linear speed at the rim, largest to smallest. Explain.Five flywheels are spinning as follows: (a) Radius 8.0 cm, period 4.0 ms; (b) Radius 2.0 cm, period
An astronaut is out in space far from any large bodies. He uses his jets to start spinning, then releases a baseball he has been holding in his hand. Ignoring the gravitational force between the
Rank the flywheels in order of angular speed, largest to smallest. Explain.Five flywheels are spinning as follows: (a) Radius 8.0 cm, period 4.0 ms; (b) Radius 2.0 cm, period 4.0
An object is in nonuniform circular motion with constant angular acceleration. Identify the correct statement(s).(1) Its acceleration is constant.(2) Its radial acceleration component is constant in
An object is in uniform circular motion. Identify the correct statement(s).(a) 1 only(b) 2 only(c) 3 only(d) 1, 2, and 3(e) 2 and 3(f) 1 and 2(g) 1 and 3(h) None of them.(1) Its acceleration is
In aviation, a standard rate turn proceeds at an angular speed of 180° per minute. What is the radius of a standard rate turn for a plane moving at 240 m/s?
When is the tension in the rope the greatest?A boy swings in a tire swing. Answer choices:(a) At the highest point of the motion(b) At the lowest point of the motion(c) At a point neither highest nor
Two satellites are in orbit around Mars with the same orbital radius. Satellite 2 has twice the mass of satellite 1. The radial acceleration of satellite 1 has magnitude a1. The radial acceleration
Dung beetles are renowned for building large (relative to their body size) balls of dung and rolling them on the ground.(a) If a dung beetle can roll (without slipping) a ball of dung whose radius is

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