A rope extends between two poles. A 90 N boy hangs from it as shown in Fig. 1. Find the tensions in the two parts of the rope. 10 5.0° Fra Fig. A 200 N wagon is to be pulled up a 30° incline at constant speed (see Fig. 2). How large a force parallel to the incline is needed if friction effects are negligible? Fy sin 30° Fycos 30° 30 30° Fig. 2 A horizontal force of 140 N is needed to pull a 60 kg box across a horizontal floor at constant 23 speed. What is the coefficient of friction between floor and box? A 70 kg box is slid along the floor by a 400 N force. The coefficient of friction between the 4 box and the floor is 0.50 when the box is sliding. Find the acceleration of the box. A 70 kg box is pulled by a 400 N force at an angle of 30° to the horizontal. The coefficient 15 of kinetic friction is 0.50. Find the acceleration of the box. A 400 g block with an initial speed of 80 cm/s slides along a horizontal tabletop against a 6 friction force of 0.70 N. (a) How far will it slide before stopping? (b) What is the coefficient of friction between the block and the tabletop? 2.

A rope extends between two poles. A 90 N boy hangs from it as shown in Fig. 1. Find the tensions in the two parts of the rope. 10 5.0° Fra Fig. A 200 N wagon is to be pulled up a 30° incline at constant speed (see Fig. 2). How large a force parallel to the incline is needed if friction effects are negligible? Fy sin 30° Fycos 30° 30 30° Fig. 2 A horizontal force of 140 N is needed to pull a 60 kg box across a horizontal floor at constant 23 speed. What is the coefficient of friction between floor and box? A 70 kg box is slid along the floor by a 400 N force. The coefficient of friction between the 4 box and the floor is 0.50 when the box is sliding. Find the acceleration of the box. A 70 kg box is pulled by a 400 N force at an angle of 30° to the horizontal. The coefficient 15 of kinetic friction is 0.50. Find the acceleration of the box. A 400 g block with an initial speed of 80 cm/s slides along a horizontal tabletop against a 6 friction force of 0.70 N. (a) How far will it slide before stopping? (b) What is the coefficient of friction between the block and the tabletop? 2.

University Physics Volume 1

18th Edition

ISBN:9781938168277

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

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

Chapter2: Vectors

Section: Chapter Questions

Problem 2.13CYU: Check Your Understanding Find the angle between forces F1and F3in Example 2.16.

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Concept explainers

Centripetal Force

A particle, body, object or certain mass while travelling in a rotational path or semicircular path, experiences an inertia force. If that inertia force pulls the towards the inward of the imaginary circle in the rotation, it is termed as centripetal force.

Question

A rope extends between two poles. A 90 N boy hangs from it as shown in Fig. 1. Find the
tensions in the two parts of the rope.
10°
5.0°
Q1
Fr2
Fig. 1
A 200 N wagon is to be pulled up a 30° incline at constant speed (see Fig. 2). How large a
force parallel to the incline is needed if friction effects are negligible?
Q2
Fysin 30°
Fwcos 30°
30
30°
Fig. 2
A horizontal force of 140 N is needed to pull a 60 kg box across a horizontal floor at constant
Q3
speed. What is the coefficient of friction between floor and box?
A 70 kg box is slid along the floor by a 400 N force. The coefficient of friction between the
Q4
box and the floor is 0.50 when the box is sliding. Find the acceleration of the box.
A 70 kg box is pulled by a 400 N force at an angle of 30° to the horizontal. The coefficient
Q5
of kinetic friction is 0.50. Find the acceleration of the box.
A 400 g block with an initial speed of 80 cm/s slides along a horizontal tabletop against a
06 friction force of 0.70 N. (a) How far will it slide before stopping? (b) What is the coefficient
of friction between the block and the tabletop?

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