 4.1DQ: Can a body be in equilibrium when only one force acts on it? Explain.
 4.1E: Two forces have the same magnitude ?F?. What is the angle between t...
 4.2DQ: A ball thrown straight up has zero velocity at its highest point. I...
 4.2E: To extricate an SUV stuck in the mud, workmen use three horizontal ...
 4.3DQ: A helium balloon hovers in midair, neither ascending nor descending...
 4.3E: BIO Jaw Injury.? Due to a jaw injury, a patient must wear a strap (...
 4.4DQ: When you fly in an airplane at night in smooth air, you have no sen...
 4.4E: A man is dragging a trunk up the loading ramp of a mover’s truck. T...
 4.5DQ: If the two ends of a rope in equilibrium are pulled with forces of ...
 4.5E: Two dogs pull horizontally on ropes attached to a post; the angle b...
 4.6E: Forces act at a point. The magnitude of is 9.00 N, and its directio...
 4.6DQ: When a car stops suddenly, the passengers tend to move forward rela...
 4.7E: A 68.5kg skater moving initially at 2.40 m/s on rough horizontal i...
 4.8DQ: Some people say that the “force of inertia” (or “force of momentum”...
 4.8E: You walk into an elevator, step onto a scale, and push the “up” but...
 4.9DQ: A passenger in a moving bus with no windows notices that a ball tha...
 4.9E: A box rests on a frozen pond, which serves as a frictionless horizo...
 4.10DQ: Suppose you chose the fundamental physical quantities to be force, ...
 4.10E: A dockworker applies a constant horizontal force of 80.0 N to a blo...
 4.11DQ: A hockey puck with mass 0.160 kg is at rest at the origin (x = 0) o...
 4.12DQ: Why is the earth only approximately an inertial reference frame?
 4.12E: A crate with mass 32.5 kg initially at rest on a warehouse floor is...
 4.13DQ: Does Newton’s second law hold true for an observer in a van as it s...
 4.13E: A 4.50kg experimental cart undergoes an acceleration in a straight...
 4.14DQ: Some students refer to the quantity as “the force of acceleration.”...
 4.14E: A 2.75kg cat moves in a straight line (the x axis). ?Figure E4.14...
 4.15DQ: The acceleration of a falling body is measured in an elevator that ...
 4.15E: A small 8.00kg rocket burns fuel that exerts a time varying upwar...
 4.16DQ: You can play catch with a softball in a bus moving with constant sp...
 4.16E: An electron (mass = 9.11 X 1031 kg) leaves one end of a TV picture...
 4.17DQ: Students sometimes say that the force of gravity on an object is 9....
 4.17E: Superman throws a 2400N boulder at an adversary. What horizontal f...
 4.18DQ: The head of a hammer begins to come loose from its wooden handle. H...
 4.18E: BIO? (a) An ordinary flea has a mass of 210 µg. How many newtons do...
 4.19DQ: Why can it hurt your foot more to kick a big rock than a small pebb...
 4.19E: At the surface of Jupiter’s moon Io, the acceleration due to gravit...
 4.20DQ: “It’s not the fall that hurts you; it’s the sudden stop at the bott...
 4.20E: An astronaut’s pack weighs 17.5 N when she is on the earth but only...
 4.21DQ: A person can dive into water from a height of 10 m without injury,...
 4.21E: BIO? Worldclass sprinters can accelerate out of the starting block...
 4.22DQ: Why are cars designed to crumple in front and back for safety? Why ...
 4.22E: A small car (mass 380 kg) is pushing a large truck (mass 900 kg) du...
 4.23DQ: When a bullet is fired from a rifle, what is the origin of the forc...
 4.23E: Boxes ?A? and ?B? are in contact on a horizontal, frictionless surf...
 4.24DQ: When a string barely strong enough lifts a heavy weight, it can lif...
 4.24E: The upward normal force exerted by the floor is 620 N on an elevato...
 4.25DQ: A large crate is suspended from the end of a vertical rope. Is the ...
 4.25E: A student of mass 45 kg jumps off a high diving board. What is the ...
 4.26DQ: Which feels a greater pull due to the earth’s gravity: a 10kg ston...
 4.26E: An athlete throws a ball of mass ?m? directly upward, and it feels ...
 4.27DQ: Why is it incorrect to say that 1.0 kg ?equals? 2.2 lb?
 4.27E: Crates A and B sit at rest side by side on a frictionless horizonta...
 4.28DQ: A horse is hitched to a wagon. Since the wagon pulls back on the ho...
 4.28E: You pull horizontally on block B in ?Fig. E4.26,? causing both bloc...
 4.29DQ: True or false? You exert a push P on an object and it pushes back o...
 4.29E: A ball is hanging from a long string that is tied to the ceiling of...
 4.30DQ: A large truck and a small compact car have a headon collision. Dur...
 4.30E: CP? A .22caliber rifle bullet traveling at 350 m/s strikes a large...
 4.31DQ: When a car comes to a stop on a level highway, what force causes it...
 4.31E: A chair of mass 12.0 kg is sitting on the horizontal floor; the flo...
 4.32DQ: A small compact car is pushing a large van that has broken down, a...
 4.32E: A skier of mass 65.0 kg is pulled up a snowcovered slope at consta...
 4.33DQ: Consider a tugofwar between two people who pull in opposite direc...
 4.33E: A 4.80kg bucket of water is accelerated upward by a cord of neglig...
 4.34DQ: On the moon, ?g? = 1.62 m/s2. If a 2kg brick drops on your foot fr...
 4.34P: A large box containing your new computer sits on the bed of your pi...
 4.35DQ: A manual for student pilots contains this passage: “When an airplan...
 4.35P: Two horses pull horizontally on ropes attached to a stump. The two ...
 4.36DQ: If your hands are wet and no towel is handy, you can remove some of...
 4.36P: CP? You have just landed on Planet X. You release a 100g ball from...
 4.37DQ: If you squat down (such as when you examine the books on a bottom s...
 4.38DQ: When a car is hit from behind, the occupants may experience whiplas...
 4.38P: CP? An oil tanker’s engines have broken down, and the wind is blowi...
 4.39DQ: In a headon auto collision, passengers who are not wearing seat be...
 4.39P: CP BIO? A Standing Vertical Jump. Basketball player Darrell Griffit...
 4.40DQ: In a headon collision between a compact 1000kg car and a large 25...
 4.40P: CP? An advertisement claims that a particular automobile can “stop ...
 4.41DQ: Suppose you are in a rocket with no windows, traveling in deep spac...
 4.41P: BIO Human Biomechanics.? The fastest pitched baseball was measured ...
 4.42P: BIO Human Biomechanics.? The fastest served tennis ball, served by ...
 4.43P: Two crates, one with mass 4.00 kg and the other with mass 6.00 kg, ...
 4.44P: An astronaut is tethered by a strong cable to a spacecraft. The ast...
 4.45P: CALC? To study damage to aircraft that collide with large birds, yo...
 4.46P: A spacecraft descends vertically near the surface of Planet X. An u...
 4.47P: CP? A 6.50kg instrument is hanging by a vertical wire inside a spa...
 4.48P: Suppose the rocket in coming in for a vertical landing instead of b...
 4.49P: BIO Insect Dynamics.? The froghopper (?Philaenus spumarius?), the c...
 4.50P: A loaded elevator with very worn cables has a total mass of 2200 kg...
 4.51P: CP? Jumping to the Ground. A 75.0kg man steps off a platform 3.10 ...
 4.52P: A 4.9N hammer head is stopped from an initial downward velocity of...
 4.53P: A uniform cable of weight ?w? hangs vertically downward, supported ...
 4.54P: The two blocks in ?Fig. P4.48? are connected by a heavy uniform rop...
 4.55P: An athlete whose mass is 90.0 kg is performing weightlifting exerc...
 4.56P: A hotair balloon consists of a basket, one passenger, and some car...
 4.57P: CP? Boxes A and B are connected to each end of a light vertical rop...
 4.58P: CALC? The position of a training helicopter (weight2.75 X 105 N) in...
 4.59P: An object with mass ?m? moves along the ?x?axis. Its position as a...
 4.60P: An object with mass m ? ? initially at rest is acted on by a force ...
 4.61P: CP CALC? A mysterious rocketpropelled object of mass 45.0 kg is in...
 4.62CP: ALC? An object of mass m is at rest in equilibrium at the origin. A...
Solutions for Chapter 4: University Physics 13th Edition
Full solutions for University Physics  13th Edition
ISBN: 9780321675460
Solutions for Chapter 4
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Key Physics Terms and definitions covered in this textbook

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parallel

any symbol
average (indicated by a bar over a symbol—e.g., v¯ is average velocity)

°C
Celsius degree

°F
Fahrenheit degree