COLLEGE PHYSICS
2nd Edition
ISBN: 9781464196393
Author: Freedman
Publisher: MAC HIGHER
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Chapter 5, Problem 23QAP
To determine
If the force exerted by the flagella doubles, the velocity of the bacterium
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M8:59
زينب أحمد خضر
Q3- In Fig. 3, elevator cabs A and B
are connected by a short cable and
can be pulled upward or lowered by
the cable above cab A. Cab A has
mass 1700 kg; cab B has mass 1300
kg. A 12.0 kg box of catnip lies on the
floor of cab A. The tension in the
cable connecting the cabs is 1.91x104
N. What is the magnitude of the
normal force on the box from the
* ?floor
Fig.3
إضافة ملف
A person stands on the ball of one foot. The normal force due to the ground pushing
up on the ball of the foot has magnitude 750 N. Ignore the weight of the foot itself.
The other significant forces acting on the foot are the tension in the Achilles tendon
pulling up and the force of the tibia pushing down on the ankle joint.
Gastrocnemius-
soleus muscles
FAchilles
Achilles tendon-
Calcaneus
(heel bone)
Tibia
N
Tibia
AN
If the tension in the Achilles tendon is 2234 N, what is the force exerted on the foot
by the tibia? If the force is upward, enter a positive value. If the force is downward,
enter a negative value.
The figure below shows a bird feeder that weighs 199.9 N. The feeder is supported by a vertical wire, which is in turn tied
to two wires, each of which is attached to a horizontal support. The left wire makes a 60° angle with the support, while the
right wire makes a 30° angle. What is the tension in each wire (in N)?
60°
30°
Bird
food
left wire
N
right wire
N
bottom wire
N
Chapter 5 Solutions
COLLEGE PHYSICS
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- A worker with mass m = 70 kg is trying to stretch his muscles with the help of a vertical wall. Assume that each hand is exerting a horizontal force of 70 N on the wall. What is the magnitude of the normal force acting by the wall on each of his hands? O60 N 50 N 70 N OR75 N O55 Narrow_forwardThe lateral head and the medial head of the gastrocnemius muscle pull on the Achilles tendon, as shown. The medial head T₁ and lateral head T₂ apply a force of 250 N and 150 N, respectively. y T₁ Gastrocnemius 20% X N 30° (a) Calculate the net force experienced by the Achilles tendon. Enter to 3 significant figures Magnitude of net force = 291.55 T₂ X Achilles Tendon b) What direction is the net force acting on the Achilles tendon? Enter the angle with respect to the y- axis. A negative angle means the force is angled to the left of the y-axis and a positive angle means to the right of the y-axis. Note that T₁ = 250 and T₂ = 150.arrow_forwardPlease Help. I need it. A physics textbook lies flat on a horizontal table top. The book's front cover is facing up. If you slide the book very, very slowly toward the edge of the table (by pushing it horizontally, not by pulling it), it will eventually fall off and land on the floor. We did this experiment in one of our Class Meetings and the result was that the book most likely will end up on the floor with its front cover facing down. Why should this outcome happen? How could you prevent this outcome from happening so the book will end up on the floor with its front cover facing up? Consider changing the book, table, or the sliding procedure. Write down a mathematical model to verify your answers to 1 and 2. Use Newton's laws and conservation methods to to help you write a model that either proves or disproves 1) and 2). Hint 1: Assume a typical table height and a typical book size & shape. Hint 2: The book’s motion will include contributions from translation as well…arrow_forward
- A block of ice (m = 15.0 kg) with an attached rope is at rest on a frictionless surface. You pull the block with a horizontal force of 95.0 N for 1.54 s. a. Determine the magnitude of each force acting on the block of ice while you are pulling. b. With what speed is the ice moving after you are finished pulling? Repeat Problem 71, but this time you pull on the block at an angle of 20.0.arrow_forwardThe maximum lift force on a bat is proportional to the square of its flying speed v. For the hoary bat (Lasiurus cinereus), the magnitude of the lift force is given by Fl (0.018 N s2/m2) v2 The bat can fly in a horizontal circle by banking its wings at an angle , as shown in Figure P7.72. In this situation, the magnitude of the vertical component of the lift force must equal the bats weight. The horizontal component of the Figure P7.72. force provides the centripetal acceleration. (a) What is the minimum speed that the bat can have if its mass is 0.031 kg? (b) If the maximum speed of the bat is 10 m/s, what is the maximum banking angle that allows the bat to stay in a horizontal plane? (c) What is the radius of the circle of its flight when the bat flies at its maximum speed? (d) Can the bat turn with a smaller radius by flying more slowly?arrow_forwardThe maximum lift force on a bat is proportional to the square of its flying speed v. For the hoary bat (Lasiurus cinereus), the magnitude of the lift force is given by Fl (0.018 N s2/m2) v2 The bat can fly in a horizontal circle by banking its wings at an angle , as shown in Figure P7.72. In this situation, the magnitude of the vertical component of the lift force must equal the bats weight. The horizontal component of the Figure P7.72. force provides the centripetal acceleration. (a) What is the minimum speed that the bat can have if its mass is 0.031 kg? (b) If the maximum speed of the bat is 10 m/s, what is the maximum banking angle that allows the bat to stay in a horizontal plane? (c) What is the radius of the circle of its flight when the bat flies at its maximum speed? (d) Can the bat turn with a smaller radius by flying more slowly?arrow_forward
- An ice cube with a mass of 0.0507 kg is placed at the midpoint of a 1.00-m-long wooden board that is propped up at a 50 angle. The coefficient of kinetic friction between the ice and the wood is 0.133. a. How much time does it take for the ice cube to slide to the lower end of the board? b. If the ice cube is replaced with a 0.0507-kg wooden block, where the coefficient of kinetic friction between the block and the board is 0.275, at what angle should the board be placed so that the block takes the same amount of time to slide to the lower end as the ice cube does? You may find a spreadsheet program helpful in answering this question.arrow_forwardIf you hold a horizontal metal bar several centimeters above the ground and move it through grass, each leaf of grass bends out of the way. If you increase the speed of the bar, each leaf of grass will bend more quickly. How then does a rotary power lawn mower manage to cut grass? How can it exert enough force on a leaf of grass to shear it off?arrow_forwardYou have been hired as an expert witness in a case involving an injury in a factory. The attorney who hired you represents the injured worker. The worker was told to lift one end of a long, heavy crate that was lying horizontally on the floor and tilt it up so that it is standing on end. He began lifting the end of the crate, always applying a force that was perpendicular to the top of the crate. As the end of the crate got higher, at a certain angle, the bottom of the crate slipped on the floor, and the worker, in trying to recover, stepped forward and the crate landed on his foot, injuring it badly. As part of your investigation, you go to the factory and measure the coefficient of static friction between a crate and the smooth concrete floor. You find it to be 0.340. Prepare an argument for the attorney showing that it was impossible to lift the crate in the manner described without it slipping on the floor.arrow_forward
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