Physics Collisions Level: Misc Level
A 6.0-kg object moving 5.0 m/s collides with and sticks to a 2.0-kg object.After the collsion 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.7.0 m/s
c.8.0 m/s
d.23 m/s
e.11 m/s
Physics Force & Laws Of Motion Level: Misc Level
A 4.0 -kg particle is moving horizontally with a speed of 5.0 m/s when it strikes a vertical wall.The partical rebounds with a speed of 3.0 m/s. What is the magnitude of the impulse delivered to tthe particle?
a. 24 N-s
b.32 NN ss
c. 400 NN ss
d. 30N .s
e. 8.0 N.s
Physics Force & Laws Of Motion Level: Misc Level
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
e.1.2 kN
Physics Work,Power & Energy Level: Misc Level
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 downward 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.-0.61 kJ
d.-0.38 kJ
e.-0.81 kJ
Physics Work,Power & Energy Level: Misc Level
A particle is acted upon by only two force, one conservative and one nonconservative,as it moves from point A to point B. The kinetic energies of the particle at points 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 nonconservative force.
c. the work of the conservative force is zero.
d.the work of the nonconservative force zero.
e. None of the above.
Physics Waves And Oscillations Level: Misc Level
A 2.0-kg block 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
c.3.5 m/s
d.1.9m/s
e.2.3 m/s
Physics Work,Power & Energy Level: Misc Level
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?
a. 46 cm
b. 36 cm
c.41 cm
d.31 cm
e.20 cm
Physics Ray Optics Level: Misc Level
Write electronic configurations of Cr3+,O2-( at no.Cr=24, O=8).
Physics Work,Power & Energy Level: Misc Level
A skier weighing 0.80 kN comes down a frictionless ski run that is circular (R=30 m) at the bottom, as shown .If her speed is 12 m/s at point A, what is her speed at the bottom of the hill (point B)?
a. 17 m/s
b.19 m/s
c.18 m/s
d.20 m/s
e. 12 m/s
Physics Work,Power & Energy Level: Misc Level
A 2.0-kg mass is projected from the edge of the top of a 20-m tall building with a velocity of 24 m/s at some unknown angle above the horizontal. Disregard air resistance and assume the ground is level.What is the kinetic energy of the mass just before it strikes the ground?
a. 0.18 kJ
b.0.97 kJ
c.0.89kJ
d.0.26 kJ
e.0.40kJ
Physics Work,Power & Energy Level: Misc Level
A single conservattive force Fx =(6.0x-12) N (x is m) acts on a particle moving along the x axis. The potential energy associated with this force is assinged value of +20 J at x=0 What is the potential energy at x=3.0m?
a. +11 J
b. +29 J
c.+9.0J
d._9.0J
e.+20 J
Physics Rotational Mechanics Level: Misc Level
A pulley 320 mm in diameter and rotating initially at 4 rev/s receives a constant angular acceleration of 2 rad/s (squared). What is the linear velocity of a belt around the pulley after 8 s? What is the tangential acceleration of the belt?
Physics Rotational Mechanics Level: Misc Level
A wheel initially rotates at 6 rev/s and then undergoes a constant angular acceleration of 4 rad/s (squared).What is the angular velocity after 5 s? How many revolutions will the wheel make?
Physics Rotational Mechanics Level: Misc Level
A belt is wrapped around the edge of a pulley that is 40 cm in diameter. The pulley rotates with a constant angular acceleration of 3.50 rad/s(squared).At t=0, the rotational speed is 2 rad/s. What are the angular displacement and angular velocity of the pulley 2 s later.
Physics Rotational Mechanics Level: Misc Level
For the wheel problem 11.8 (see below for problem 11.8) what is the angular acceleration? What is the linear acceleration of a point on the edge of the wheel?
