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Problems with solutions
I.D
Level
Problem
Problem Topic
272
High school
A 4.0 kg particle is moving horizontally with a speed of 5.0 m/s when it strikes a vertical wall . The particle rebound with a speed of 3.0 m/s . what is the magnitude of the impulse delivered to the particle ?
a) 24 N.s
b) 32 N.s
c) 40 N.s
d) 31 N.s
e) 8.0 N.s
. . . continues Work,Power & Energy
269
High school
A particle is acted up on by only two forces, one conservative and one nonconservative as it moves from point A to point B . The kinetic energy of particle at point A and B are equal if .
a) The sum of the works of the two forces is zero .
b) the work of the conservative force is equal to the work of the . . . continues
Work,Power & Energy
268
High school
A 2.0 kg block is sliding on a horizontal frictionless surface is attached to one end of a horizontal spring (k= 200 N/m) which has its other end fixed . If the block has a speed of 4.0 m/s as it passes through the equilibrium position . What is its speed when it is 20 cm from the equilibrium position ?
a) 2.6 m/s
b) 3.1 m/s continues
Work,Power & Energy
180
High school
After a tornado , a 0.60 g straw was found embedded 2.9 cm into the trunk of a tree . If the average force exerted on the straw by the tree was 60 N , What was the speed of the straw when it hit the tree ?
. . . continues Force & Laws of Motion
267
High school
A spring (k= 600 N/m) is placed in a vertical position with its lower end supported by a horizontal surface . The upper end is depressed 20 cm , and a 4.0 kg block is placed on the depressed spring . The system is then released from rest . How far above the point of release will the block rise ?
46 cm
36 cm
41 cm
31 cm continues
Work,Power & Energy
40
High school
Two blocks are connected by a cable via a pulley which are massless and frictionless.
Given the following: m=300.0 kg, m2= 100.0 kg, theta = 40.0 degree, micro = 0.350, determine:
a. The direction of acceleration (mathematically no guesses)
b. The value of acceleration
c. . . . continues
Force & Laws of Motion
41
High school
Two masses are suspended from a frictionless pulley as shown in "click here " The pulley itself if has a mass of 10.kg and its radius r = 10 cm.
(a) what is the magnitude of the acceleration of the suspended masses is m1 = 8 kg
(b) what are the tension in the strings? (Neglect the mass of the string.)
. . . continues Force & Laws of Motion
42
High school
A 15.0 kg uniform board 2.4 m long is pivoted so that it can rotate at a horizontal axis through the end (point A). If a 100-kg mass and is suspended 1.80 m from the pivoted end, what is the tension in the string ? . . . continues Force & Laws of Motion
43
High school
Consider a too-small space habitat that consists of a rotating cylinder of radius of 4m. If a man standing inside is 2m tall and his feet are at 1g, what is the g force at the elevation of his head?
. . . continues Rotational Mechanics
44
High school
A person dives from atop a flagpole into a swimming pool below. His potential energy at the top is 10,000J. What is his kinetic energy when his potential energy reduces to 1000J?
. . . continues Work,Power & Energy
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