Physics Magnetism,Magnetic Effects Of Current Level: High School
Magnetic Flux
The figure at “click here” showing a magnetic field B and a five loops . If you put each loop in a magnetic field (without rotating it) and calculate the flux , Will any two of them have the same flux ? Rank the loops from most flux , and explain why ranked them in that order .(loops a = d are circular loops shown edge-on)` .
Physics Force & Laws Of Motion Level: High School
Tension in a String
A block is hanging from the ceiling by a single wire . When a horizontal force of 12 N is applied on the block the wire makes an angle of 20 degrees with the vertical, as shown in the figure at “click here” . What is the mass of the blocka) 0.44 kg
b) 1.2 kg
c) 1.3 kg
d) 3.4 kg
e) 3.6 kg
Physics Force & Laws Of Motion Level: High School
Tension in a String
A 10-m uniform beam of weight 100 N is supported by two ropes at the ends . If a 400-N person sits at 2.0 m from the left end of the beam , what is the tension in the left rope ?a) 130N
b) 250 N
c) 300 N
d) 370 N
e) 500 N
Physics Rotational Mechanics Level: High School
Rotational Kinetics
A merry-go-round ,starting from rest , makes one complete rotation in 8.0 seconds before reaching its full speed , What is its angular acceleration ?a) 0.031 rad/s^2
b) 0.098 rad/s^2
c) 0.20 rad/s^2
d) 0.78 rad/s^2
e) 1.6 rad/s^2
Physics Rotational Mechanics Level: High School
Circular Motion
A car whose tires have radii of 50 cm travel at 36 km/h . What is the angular speed of the tires ?a) 5.0 rad/s
b) 10 rad/s
c) 20 rad/s
d) 72 rad/s
e) 200 rad/s
Physics Force & Laws Of Motion Level: High School
Conservation of Momentum
An object of mass 3 kg ,initially at rest , explodes breaking into two fragments of masses 1 kg and 2 kg ,respectively , which one of the following statements concerning the fragments after the explosion is true ?a) The larger fragment remains at rest
b) The larger fragment will have twice the speed of the smaller fragment
c) The larger fragment will have four times the speed of the smaller fragment .
d) Both fragments will fly with the same speed
e) The smaller fragment will have twice the speed of the larger fragment .
Physics Force & Laws Of Motion Level: High School
Impulse
Joe throws a 0.15 kg rubber ball directly downward to the floor . The ball’s speed just before impact is 6.5 m/s and just after the impact is 3.5 m/s . If the ball is in contact with the floor for 0.025 s , what is the magnitude of the average force that the floor exerts on the ball during the time of contact ?a) 3.0N
b) 18 N
c) 30 N
d) 60 N
e) 130 N
Physics Work,Power & Energy Level: High School
Kinetic Energy
A 15-kg child stroller is moving towards you with a speed of 2.5 m/s . How much work is required to stop the stroller ?a) 19 J
b) 38 J
c) 47 J
d) 94 J
e) 460 J
Physics Work,Power & Energy Level: High School
From the top of a 75.0 m high building , a 1.00 kg ball is thrown directly downward with an initial speed of 8.00 m/s . If the ball reaches the ground with a speed of 32.0 m/s , the mechanical energy lost to friction is equal to :a) 0 J
b) 255 J
c) 480 J
d) 735 J
e) 767 J
Physics Kinematics Level: High School
One Dimensional
A hockey puck slides across flat ice (micro s = 0.23 and micro k = 0.19) for a distance 38 m before coming to stop . What was the puck’s initial speed ?a) 7.2 m/s
b) 8.4 m/s
c) 9.2 m/s
d) 12 m/s
e) 13 m/s
Physics Vectors Level: High School
Vector A is 3.1 m north , and vector B is 3.1 m east . Vector A-B is ?a) zero
b) 4.4 m at 45 degrees south of east
c) 4.4 m at 45 degrees south of west
d) 4.4 m at 45 degrees north of west
e) 4.4 m at 45 degrees north of east
Physics Kinematics Level: High School
One Dimensional
If a flea can jump straight up to a height of 45.0 cm , what is the initial speed as it leaves the ground ?a) 2.10 m
b) 2.97 m
c) 4.41 m
d) 8.82 m
e) 29.7 m
Physics Measurements Level: High School
The number of 8.0500 has how many significant figures ?a) 1
b) 2
c) 3
d) 4
e) 5
Physics Rotational Mechanics Level: High School
Mass m1 on a frictionless table is connected by a string through a hole in the table to a hanging mass m2 . With what speed must m1 rotate in a circle of radius r if m2 is to remain hanging at rest ?
Physics Force & Laws Of Motion Level: High School
Friction
Two packages as UPS starts sliding down the 20 degree ramp . Package A (in front of B) has a mass of 5.0 kg and a coefficient of friction of 0.20 . Package B has a mass of 10 kg and a coefficient of friction of 0.15 . How long does it take package A to reach the bottom ?