Problem-solving questionsAt the back of the leg, two muscles pull on the Achilles tendon to create an upward force.Estimate the nett force if cach muscle has a diameter of about 5.0 mm and exerts a force in adirection of 25° from the vertical. (Use a force per unit area of muscle of 7x10° N/m²).An 18 kg penguin slides down an iceberg at an angle of 15° to the horizontal. Frictionbetween the penguin's body and the ice surface is negligible. Determine the normal forceacting on the penguin and its acceleration down the iceberg.A manufacturer of children's slides does some tests and discovers that the slope of a slipperyslide must be at least 25° to the horizontal for the slide to work. The child involved in doingthe testing weighs 35 kg. What is the coefficient of static friction between the child and theslide?A car drives onto a section of the road which is covered in ice. The driver attempts to stop byhitting the brakes but the wheels lock and the car skids for another 60 m. Determine thecoefficient of kinetic friction between the wheels and the ice if the initial speed of the car was40 km/hr.

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At the back of the leg, two muscles pull on the Achilles tendon to create an upward force. Estimate the nett force if cach muscle has a diameter of about 5.0 mm and exerts a force in a direction of 25° from the vertical. (Use a force per unit area of muscle of 7x10° N/m²).

At the back of the leg, two muscles pull on the Achilles tendon to create an upward force. Estimate the nett force if cach muscle has a diameter of about 5.0 mm and exerts a force in a direction of 25° from the vertical. (Use a force per unit area of muscle of 7x10° N/m²).

University Physics Volume 1

18th Edition

ISBN:9781938168277

Author:William Moebs, Samuel J. Ling, Jeff Sanny

Publisher:William Moebs, Samuel J. Ling, Jeff Sanny

Chapter6: Applications Of Newton's Laws

Section: Chapter Questions

Problem 47P: (a) What is the maximum frictional force in the knee joint of a person who supports 66.0 kg of her...

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Mechanical Properties of Solids

There are three types of matter- solid, liquid and gas. Out of them, solids have a rigid shaped and size. The intermolecular forces of attractions in solids are greatest. Mechanical properties are the physical properties of a material which it shows, when it is provided with certain amount of force or load. These properties are to be kept in mind for various purposes. When a force is applied to an object, the object may or may not get deformed depending upon its elastic property. But every time the object develops a restoring force against the force applied. This is commonly known as stress. If the object changes its dimensions due to the force applied it develops strain ( which is the ratio of change in dimension to the original dimension).

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