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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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?
Transcribed Image Text: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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