College Physics
11th Edition
ISBN:9781305952300
Author:Raymond A. Serway, Chris Vuille
Publisher:Raymond A. Serway, Chris Vuille
Chapter1: Units, Trigonometry. And Vectors
Section: Chapter Questions
Problem 1CQ: Estimate the order of magnitude of the length, in meters, of each of the following; (a) a mouse, (b)...
Related questions
Question
#5
Transcribed Image Text:5. A 50-kg box is being pushed along a horizontal surface. The coefficient of static friction between the box
and the ground is 0.65, and the coefficient of kinetic friction is 0.35. What horizontal force must be exerted
on the box for it to accelerate at 1.2 m/s2?
A) 60 N
B) 120 N
C) 170 N
D) 230 N
E) 490 N
Final formula:
Required steps:
1) Draw free body diagram
2) Choose reference frame
3) Find vectors components
4) Apply Newton's 2nd law
5) Find the horizontal F algebraically
6) Check units
7) Substitute numerical values
6. A 15-kg block is on a frictionless ramp that is inclined at 20° above the horizontal. It is connected by a very
light string over an ideal pulley at the top edge of the ramp to a hanging 19-kg block, as shown in the
figure. The string pulls on the 15-kg block parallel to the surface of the ramp. Find the magnitude of the
acceleration of the 19-kg block after the system is gently released?
A) 4.0 m/s2
B) 3.8 m/s2
C) 4.2 m/s2
D) 4.5 m/s2
Final formula:
15
kg
19
kg
20°
Required steps:
Expert Solution
Step 1
Since block is moving (accelerating ) so kinetic friction will acts.
Given mass m = 50 kg
Acceleration a = 1.2 m/s2
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