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Problems with solutions
| I.D |
Level |
Problem |
Problem Topic |
| 24 |
High school |
Blocks A and B are moving towards each other along the X axis. A has a mass of 4.00 kg and a velocity of 30.0 m/s ( in the positive X direction), While B has a mass of 2.00 kg and a velocity of -25.0 m/s (in the negative direction).
A) Assume they sugffer an elastic head-on collision and move off along the . . . continues
Click to Purchase Solution |
Force & Laws of Motion |
| 181 |
High school |
A child pulls a friend in a little red wagon with constant speed . If the child pulls with a force of 16 N for 14.3 m , and the handle of the wagon is inclined at an angle of 29 degree above the horizontal , how much work does the child do on the wagon ?
. . . continues
Click to Purchase Solution |
Force & Laws of Motion |
| 26 |
High school |
A stone of m = 0.8 kg is projected across a sheet of ice with an initial speed of 2.40m s^-1 . The coefficient of sliding friction between the stone and the ice is 0.0250 . How far will the stone travel before it come to rest ? Take g = 9.81m s^-2 . . . . continues
Click to Purchase Solution |
Force & Laws of Motion |
| 271 |
High school |
A 1.2 kg object moving with a speed of 8.0 m/s collides perpendicularly with a wall and emerges with a speed of 6.0 m/s in the opposite direction . If the object is in contact with the wall for 2.0 ms , what is the magnitude of the average force on the object by the wall ?
a) 9.8 kN
b) 8.4 kN
c) 7.7 kN
d) 9.1 kN
. . . continues
Click to Purchase Solution |
Work,Power & Energy |
| 270 |
High school |
A 3.0 kg mass is dropped from the edge of a 50-m tall building with an initial speed of zero. The mass strikes the ground with a down ward velocity of 25 m/s. how much work is done on the mass by air resistance between the point where it is dropped and the point where it strikes the ground ?
a) -0.46 kj
b) -0.53 kj
c) . . . continues
Click to Purchase Solution |
Work,Power & Energy |
| 29 |
High school |
A box of mass 8.3 kg placed on a smooth horizontal table is acted on by two horizontal forces . The first of magnitude 0.3 Newton's acts due East , and the second of magnitude 0.3 Newton's acts due North . Find the velocity of the box after 14.9 seconds . . . . continues
Click to Purchase Solution |
Force & Laws of Motion |
| 276 |
High school |
If you know the impulse that has acted on a body of mass m you can calculate ,
a) its initial velocity
b) its final velocity
c) its final momentum
d) the change in its velocity
e) the acceleration during the impulse
. . . continues
Click to Purchase Solution |
Force & Laws of Motion |
| 275 |
High school |
A car of mass m1 traveling at velocity V passes a car of mass m2 parked at the side of the road . The momentum of the system of the two cars are
a) 0
b) (m1)*V
c) (m1-m2)*V
d) (m1)*V/(m1+m2)
e) (m1+m2)*V
. . . continues
Solution:
Momentum of the system of two cars = (m1)* V + O = (m1)V
So answer is 'b'
|
Force & Laws of Motion |
| 274 |
High school |
A 3.0 kg object moving 8.0 m/s in the positive x direction has a one-dimensional elastic collision with an object (mass = M) initially at rest . After the collision the object of unknown mass has a velocity of 6.0 m/s in the positive x direction . What is M ?
a) 7.5 kg
b) 5.0 kg
c) 6.0 kg
d) 4.2 kg
. . . continues
Click to Purchase Solution |
Work,Power & Energy |
| 273 |
High school |
A 6 kg object is moving 5.0 m/s collides with and sticks to a 2.0 kg object . After the collision the composite object is moving 2.0 m/s in a direction opposite to the initial direction of motion of the 6.0 kg object . Determine the speed of the 2.0 kg object before the collision .
a) 15 m/s
b) 7 m/s
c) 8 m/s
d) 23 m/ . . . continues
Click to Purchase Solution |
Work,Power & Energy |
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