Physics Force & Laws Of Motion Level: High School
Impulse
A girl of mass 50 kg throws a ball of mass 0.1 kg against a wall . The ball strikes the wall horizontally with a speed of 20 mls , and it bounces back with this same speed . The ball is in contact with the wall 0.05 s . What is the average force exerted on the wall by the ball ?a) 16 N
b) 20 N
c) 32 N
d) 40 N
e) 80 N
Physics Work,Power & Energy Level: High School
Inelastic Collision
An 8 kg block has a speed v and is behind a 12 kg block that has a speed of 0.5 –m/s. The surface is frictionless . The blocks collide and couple . After the collision, the blocks have a common speed of 0.9 m/s . In the figure which is shown at “click here” , the loss of kinetic energy of the blocks due to the collision is closest to :a) 1.5 J
b) 1.8 J
c) 2.1 J
d) 2.4 J
e) 2.7 J
In the figure , the impulse on the 12 kg block due to the collision is closest to :a) 3.6 N.s
b) 4.8 N.s
c) 6.0 N.s
d) 7.2 N.s
e) 8.4 N.s
Physics Work,Power & Energy Level: High School
Elastic Collision
A 3.0 kg block, moving on as frictionless surface with a speed of 1.2 m/s , makes a perfectly elastic collision with a block of mass M at rest . After the collision, the 3.0 kg block recoils with a speed of 0.4 m/s . In the figure which is shown at “click here” , the mass M is closest to :a) 1.5 kg
b) 3.0 kg
c) 4.5 kg
d) 6.0 kg
e) 7.5 kg
In the figure , the speed of the block of mass M after the collision is closest to :a) 0.8 m/s
b) 1.0m/s
c) 1.2m/s
d) 1.4 m/s
e) 1.6 m/s
Physics Work,Power & Energy Level: High School
Conservation of Energy
A 0.50 kg block is held in place against the spring by a 36 N horizontal external force . The external force is removed , and the block is projected with a velocity V1 = 1.2 m/s upon separation from the spring . The block descends a ramp and has a velocity V2 = 1.8 m/s at the bottom . The track is frictionless between points A and B . The track is frictionless between points A and B . The block enters a rough section at B ,extending to E . The coefficient of kinetic friction is 0.30 . The velocity of the block is v3 = 1.4 m/sat C . The block moves on to D , where it stops . In the figure at “click here” , the work done by friction between points B and C is closest to :a) -0.32 J
b) -0.40 J
c) -0.48 J
d) -0.56 J
e) -0.64 J
In the figure , the distance that the block travels between points Band D is closer to:a) 0.25 m
b) 0.35 m
c) 0.45 m
d) 0.55 m
e) 0.65 m
Physics Work,Power & Energy Level: High School
Conservation of Energy
Two objects, one of mass m and the other of mass 2 m, are dropped from the top of a building . When they hit the ground :a) Both will have the same kinetic energy .
b) The heavier one will twice the kinetic energy of the lighter one .
c) The heavier one will have four times the kinetic energy of the lighter one .
d) The heavier one will have half the kinetic energy of the lighter one .
e) The heavier one will have one-fourth the kinetic energy of the lighter one .
Physics Work,Power & Energy Level: High School
Vertical Circle
A 1.5 m mass less rod is loosely pinned to a frictionless pivot at 0.A 3.0 ball is attached to the other end of rod . The ball is held at A , where the rod makes 30 degrees angle above the horizontal , and is released . The ball-rod assembly then swings freely in a vertical circle between A and B . In figure which is shown at “click here” , the ball passes through C , where the rod makes an angle of 30 degree below the horizontal . The speed of the ball as it passes through C is closet to :a) 3.8 m/s
b) 4.7 m/s
c) 5.4 m/s
d) 6.1 m/s
e) 6.6 m/s
In the figure , the tension in the rod when the ball passes through the lowest point at D is closet to :a) 30 N
b) 60 N
c) 90 N
d) 120 N
e) 150 N
Physics Work,Power & Energy Level: High School
Conservation of Energy
An 8.0 kg block is released from rest, v1 = 0 m/s, on a rough incline . The block moves a distance of 1.6 m down the incline , in a time interval of 0.80 s , and acquires a velocity of v2 = 4.0 m/s . In the figure which is shown at “click here”, the work done by the weight is closed to :a) +80]
1b) +100]
c) +120]
d) -80]
e) -100]
Physics Work,Power & Energy Level: High School
Vertical Circle
Ferris wheel has radius 5.0 m and make one revolution in 8.0 seconds. A person weighing 670 N is sitting on one of the benches attached at the rim of the wheel . What is the apparent weight (that the normal exerted on her by the bench) of the person as she passes through the highest point of her motion ?
Physics Misc Topic Level: Misc Level
Inelastic Collision in Two dimensional
A 49.0 kg skater is traveling due east at a speed of 3.04 m/s . A 69.5 kg skater is moving due south at a speed of 6.94 m/s . They collides and hold on to each other after the collision, managing to move off at an angle south of east , with a speed of vf . Find the angle theta ? and find the speed vf, assuming that friction can be ignored ?
Physics Work,Power & Energy Level: High School
Inelastic Collision in Two dimensional
A 49.0 kg skater is traveling due east at a speed of 3.04 m/s . A 69.5 kg skater is moving due south at a speed of 6.94 m/s . They collides and hold on to each other after the collision, managing to move off at an angle south of east , with a speed of vf . Find the angle theta ? and find the speed vf, assuming that friction can be ignored ?
Physics Magnetism,Magnetic Effects Of Current Level: High School
Solenoid
A solenoid that is 142 cm long has a radius of 1.75 cm and a winding of 1650 turns , it carries a current of 3.46 A . Calculate the magnitude of the magnetic field inside the solenoid ?
Physics Magnetism,Magnetic Effects Of Current Level: High School
Solenoid
A 200-turn solenoid having a length of 35 cm and a diameter of 8.4 cm carries a current of 0.24 A . Calculate the magnitude of the magnetic field inside the solenoid ?
Physics Magnetism,Magnetic Effects Of Current Level: High School
Magnetic Effect of Current
Two long straight wires are perpendicular to the page and separated by distance d1 = 0.75 cm . Wire 1 carries 6.2 A into the page . What is the current in the wire 2 if the net magnetic field due to the two currents is zero at point P located a distance d2 = 1.50 cm from the wire 2 ?
Physics Waves And Oscillations Level: High School
Seconds Pendulum
A “seconds” pendulum is one that moves through its equilibrium position once each second . (The period of the pendulum is 4.2 s ) The length of a seconds pendulum is 0.9921 m at Tokyo and 0.9947 m at Cambridge , England . What is the Cambridge : Tokyo ratio of these free-fall acceleration ?
Physics Rotational Mechanics Level: High School
Movement of Inertia
Consider a light rod of negligible mass and length L pivoted on a frictionless horizontal bearing at a point O . Attached to the end of the rod is a mass M1 . Also , a second mass M2 of equal size (ie, M1 = M2 = M) is attached to the rod (6/9 L from the lower end) , as shown in the figure at “click here” . What is the moment of inertia I about O ?1) I = 29/25 M L^2
2) I = 106/81 M L^2
3) I = 74/49 M L^2
4) I = 53/49 M L^2
5) I = 17/16 M L^2
6) I = 10/9 M L^2
A) What is the period of this pendulum in the small angle approximation ?