Essential University Physics (3rd Edition)
3rd Edition
ISBN: 9780134202709
Author: Richard Wolfson
Publisher: PEARSON
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Textbook Question
Chapter 4, Problem 8FTD
In paddling a canoe, you push water backward with your paddle. What force actually propels the canoe forward?
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Students have asked these similar questions
A student attaches a bucket to a cart resting on a 15° incline. The different force acting on the objects are:
T: Tension of the strings; N: Normal Force; f: any possible friction; W1: weight of cart; and W2: weight of
bucket
cart
T
T
bucket
fk
15° V W1
67. The bucket is filled with water until the cart starts to move up the incline at a constant velocity. Which
one(s) of the following relationships between forces is/are correct?
a. W, >T > f
b. W, >T > f +W, sin 15°
c. W, =T > f
d. W, = T = f +W, sin15°
2
2
2
68. Then, the water is replaced by equal volume of sand. Now, which one(s) is/ are correct?
a. W, >T > f
b. W, >T > ƒ +W, sin15°
c. W, =T > f
d. W, = T = f +W, sin15°
2
2
2
2
A 1450-kg submarine rises straight up toward the surface. Seawater exerts both an upward buoyant force of 16,140 N on the submarine and a downward resistive force of 1030 N. What is the submarine’s acceleration?
How many forces are acting on the submarine?
A hummingbird is hovering motionless beside a flower. The blur of its wings shows that they are rapidly beating up and down. If the air pushes upward on the bird with a force of 0.35 N, what is the force exerted on the air by the hummingbird? If the force of the bird on the air is downward, enter a negative value and if it is upward, enter a positive value.
Chapter 4 Solutions
Essential University Physics (3rd Edition)
Ch. 4.2 - A curved barrier lies on a horizontal tabletop, as...Ch. 4.2 - A nonzero net force acts on an object. Which of...Ch. 4.4 - A popular childrens book explains the...Ch. 4.5 - For each of the following situations, would the...Ch. 4.6 - The figure shows two blocks with two forces acting...Ch. 4.6 - (1) Would the answer to (a) in Example 4.5 change...Ch. 4 - Distinguish the Aristotelian and Galilean/New...Ch. 4 - A ball bounces off a wall with the same speed it...Ch. 4 - We often use the term inertia to describe human...Ch. 4 - Does a body necessarily move in the direction of...
Ch. 4 - A truck crashes into a stalled car. A student...Ch. 4 - A barefoot astronaut kicks a ball, hard, across a...Ch. 4 - The surface gravity on Jupiters moon Io is...Ch. 4 - In paddling a canoe, you push water backward with...Ch. 4 - Is it possible for a nonzero net force to act on...Ch. 4 - As your plane accelerates down the runway, you...Ch. 4 - A driver tells passengers to buckle their...Ch. 4 - If you cut a spring in half, is the spring...Ch. 4 - As youre sitting on a chair, theres a...Ch. 4 - Section 4.2 Newtons First and Second Laws A subway...Ch. 4 - A 61-Mg railroad locomotive can exert a 0.12-MN...Ch. 4 - A small plane accelerates down the runway at 7.2...Ch. 4 - A car leaves the road traveling at 110 km/h and...Ch. 4 - By how much does the force required to stop a car...Ch. 4 - Kinesin is a motor protein responsible for moving...Ch. 4 - Starting from rest and undergoing constant...Ch. 4 - In an egg-dropping contest, a student encases an...Ch. 4 - In a front-end collision, a 1300-kg car with...Ch. 4 - Show that the units of acceleration can be written...Ch. 4 - Your spaceship crashes on one of the Suns planets....Ch. 4 - Your friend can barely lift a 35-kg concrete block...Ch. 4 - A cereal box says net weight 340 grams. Whats the...Ch. 4 - Youre a safely engineer for a bridge spanning the...Ch. 4 - The gravitational acceleration at the...Ch. 4 - A 50-kg parachutist descends at a steady 40 km/h....Ch. 4 - A 930-kg motorboat accelerates away from a dock at...Ch. 4 - An elevator accelerates downward at 2.4 m/s2. What...Ch. 4 - At 560 metric tons, the Airbus A-380 is the worlds...Ch. 4 - Youre an engineer working on Ares I, NASAs...Ch. 4 - You slop into an elevator, and it accelerates to a...Ch. 4 - What upward gravitational force does a 5600-kg...Ch. 4 - Your friends mass is 65 kg. If she jumps off a...Ch. 4 - What force is necessary to stretch a spring 48 cm,...Ch. 4 - A 35-N force is applied to a spring with spring...Ch. 4 - A spring with spring constant k = 340 N/m is used...Ch. 4 - A 1.25-kg object is moving in the x-direction at...Ch. 4 - An airplane encounters sudden turbulence, and you...Ch. 4 - A 74-kg tree surgeon rides a cherry picker lift to...Ch. 4 - A dancer executes a vertical jump during which the...Ch. 4 - Find expressions for the force needed to bring an...Ch. 4 - An elevator moves upward at 5.2 m/s. Whats its...Ch. 4 - A 2.50-kg object is moving along the x-axis at...Ch. 4 - Blocks of 1.0, 2.0, and 3.0 kg are lined up on a...Ch. 4 - A child pulls an 11-kg wagon with a horizontal...Ch. 4 - Biophysicists use an arrangement of laser beams...Ch. 4 - A force F is applied to a spring of spring...Ch. 4 - A 22(M)-kg airplane pulls two gliders, the first...Ch. 4 - A biologist is studying the growth of rats on the...Ch. 4 - An elastic towrope has spring constant 1300 N/m....Ch. 4 - A 2.0-kg mass and a 3.0-kg mass are on a...Ch. 4 - Youre an automotive engineer designing the crumple...Ch. 4 - Frogs tongues dart out to catch insects, with...Ch. 4 - Two large crates, with masses 640 kg and 490 kg,...Ch. 4 - What force do the blades of a 4300-kg helicopter...Ch. 4 - What engine thrust (force) is needed to accelerate...Ch. 4 - Your engineering firm is asked to specify the...Ch. 4 - With its fuel tanks half full, an F-35A jet...Ch. 4 - Two springs have the same unstretched length but...Ch. 4 - Although we usually write Newtons second law for...Ch. 4 - A railroad car is being pulled beneath a grain...Ch. 4 - A block 20% more massive than you hangs from a...Ch. 4 - Youre asked to calibrate a device used to measure...Ch. 4 - A spider of mass ms drapes a silk thread of...Ch. 4 - Figure 4.27 shows vertical accelerometer data from...Ch. 4 - A hockey stick is in contact with a 165-g puck for...Ch. 4 - After parachuting through the Martian atmosphere,...Ch. 4 - Your airplane is caught in a brief, violent...Ch. 4 - Youre assessing the Engineered Material Arresting...Ch. 4 - Two masses are joined by a massless string. A 30-N...Ch. 4 - A mass M hangs from a uniform rope of length L and...Ch. 4 - Jerk is the rate of change of acceleration, and...Ch. 4 - Laptop computers are equipped with accelerometers...Ch. 4 - Laptop computers are equipped with accelerometers...Ch. 4 - Laptop computers are equipped with accelerometers...Ch. 4 - Laptop computers are equipped with accelerometers...
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- A ship is sailing with a constant speed of 18 m/s. The ship has a mass of 2500 kg and water resistance is applying a force of 450 N. What force is the wind applying?arrow_forwardA 33-kg boy rides an elevator. He brought a bathroom scale with him and was very curious of what will be the reading when the elevator moves up and down. If the bathroom scale reading is 45 kg, determine the magnitude and direction of the elevator’s acceleration.arrow_forwardA stack of two crates is being accelerated upwards by two cables. The cables are directly attached to crate 1 and the tension in each cable is 3248 N. You may assume that the masses of the cables are negligible compared to the masses of the crates. The acceleration of the crates is? bottom crate crate 1 is 109 kg. the top crate is 248 kg.arrow_forward
- A rock with a density 2.8 times the density of water is dropped into a lake (SG = 0.90). A person dives in and tries to get it out. Which the relationship between the mass of person and the mass of rock so that the person can lift it from the bottom of the lake?arrow_forwardA 2.0-kg mass is suspended by a string from the ceiling of an elevator that is accelerating downward at 1.4 m/s2. What is the tension in the string?arrow_forwardA 90 kg woman on roller skates pushes a 35 kg girl, also on roller skates, with a force of 50 N. The magnitude of the force exerted by the girl on the woman is 200 N 100 N 50 N 40 N 38 N zeroarrow_forward
- A is one that moves vertically in air under the action of its weight alone. Air resistance is neglected and there is no external additional factor that is causing the body to move except gravity * FALL FREE BODY FREE FALL BODY FREE FALLING BODY FREE BODY FALLING Other:arrow_forwardA boat moves through the water with two forces acting on it parallel to the water’s surface. One is a 2,000 N forward force due to the motor/propeller, and the other is an 1,800 N resistive force due to the water around the bow (front of the boat). What is the acceleration of the 1,000 kg boat? If the boat started from rest, how far will it move in 10s? What will the boat’s velocity be at the end of this time interval?arrow_forwardAn elevator has a scale that measures the normal force between the contents and the floor. What force will the scale measure if the contents have a mass of 960 kg and the elevator is accelerating up at a rate of 1.5 m/s2?arrow_forward
- A person weighs -800 N and is traveling downwards in an elevator whilst stood on a bathroom scale (as one does!). The person notices that the scale doesn't always read bodyweight. When arriving at the bottom, the scale reads 840 N. If the person has a mass of 81.5 kg, what is the acceleration of the elevator?arrow_forwardImagine you work on a garden store during the summer. If you lift a bag of fertilizer with a force of 125 N, and it is moving upward with an acceleration of 0.728 m / s2. a) What is the mass (in kg) of the fertilizer bag? b) How much does the fertilizer bag weigh (in N)?arrow_forwardA 75 kg man stands on on a scale in an elevator. When the elevator begins to rise, the scale reads 100 kg. What was the acceleration in factors of g?arrow_forward
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