Physics Rotational Mechanics Level: University
Rotational MotionA 60.0-kg skater begins a spin with an angular speed of 6.0 rad/s. By changing the position of her arms the skater decreases her moment of inertia by 50 persent.What is the skaters final angular speed?
Physics Rotational Mechanics Level: University
Rotational MotionA string is wrapped around a pulley of radius 0.10 m and moment of inertia 0.15 kg.m2. The string is pulled with a force of 12N. What is the magnitude of the resulting angular acceleration of the pulley?
Physics Rotational Mechanics Level: University
Rotational MotionA 50 N.m torque acts on a wheel of moment of inertia 150 kg.m2. If the wheel starts from rest how long will it take the wheel to make one revolution?
Physics Rotational Mechanics Level: University
Rotational MotionA meter stick is pivoted at the 0.50-m line. A 3.0 - kg object is hung from the 0.10-m line. Where should a 5.0-kg object be hung to achieve equilibrium?
Physics Work,Power & Energy Level: University
Conservation of momentumA 0.50-kg bomb is sliding along an icy pond (frictionless surface) with a velocity of 2.0m/s to the west
The bomb explodes into two pieces. After the explosion a 0.20 kg piece moves south at 4.0 m/s
What are the components of the velocity of the 0.30 kg piece?
Physics Work,Power & Energy Level: University
CollisionA 3.0-kg cart moving to the right with a speed of 1.0 m/s has a head on collision with a 5.0-kg cart that is initially moving to the left with a speed of 2 m/s. After the collision 3.0-kg cart is moving to the left with a speed of 1 m/s. What is the final velocity of the 5.0-kg cart?
Physics Work,Power & Energy Level: University
CollisionTwo pbjects of equal mass traveling toward each other with equal speeds undergo a head on collision wich one of the following statements is necessarily true?
They will exchange velocities
Their velocities will be reduced
Their velocities will be unchanged
Their velocities will be zero
Their velocities may be zero
Physics Work,Power & Energy Level: University
Kinetic EnergyWhich one has the largest kinetic energy?
a rain drop
a woman swimming
a jet airplane flying at maximum speed the earth moving in its orbit around the sum the space shuttle orbiting earth
Physics Gravitation Level: University
Planetory motionCallisto and Io are two jupiter moons. The distance from callisto to the center of jupiter is approximately 4.5 times as far as Io. How does callistos orbital period Tc
Compare to
that of Io Ti?
Tc = 4.5 Ti
Tc = 21 Ti
Tc = 9.5 Ti
Tc = 0.2 Ti
Tc = 2.7 Ti
Physics Force & Laws Of Motion Level: University
FrictionA 10-kg is set moving with a constant speed of 6 m/s on a rough horizontal
surface
If the force of friction is 20N, approximately how far does the block travels before it stops?
Physics Electrostatics Level: University
Coulomb's LawA raindrop inside a thundercloud has a charge -8e. What is the electric force on the raindrop if the electric field at its location (due to other charges in the cloud has magnitude of 2.0 x 10^6 N/C and is directed up?
Physics Electrostatics Level: University
Gauss's theoremPower lines have a limit on the maximum size of the electric field they produce. In most states a maximum of 5 kN/C at about 20 m from the wires is allowed. This is quite large compared to the Earth's fair-weather electric field of about 100 N/C. Assume that the formula for the electric field of a wire to determine how much charge per unit length is on the wire.
Physics Electrostatics Level: University
Gauss's theoremA solid sphere of charge of radius R has a total charge of q uniformly spread throughout the sphere. (a) Find the magnitude of the electric field for > = R.
(b) Find the magnitude of the electric field for r < = R. (c) Sketch a graph of E (r) for 0<=r<=3R.
Physics Electrostatics Level: University
Gauss's TheoremIn fair weather over flat ground there is a downward electric field of about 150 N/C. (A) Assume that the Earth is a conducting sphere with charge on its surface. If the electric field just outside is 150 N/C radially inward calculate the total charge on the Earth and the charge per unit area. (b) At an altitude of 250 m above the Earths surface the field is only 120 N/C. Calculate the charge density
( Charge per unit volume) of the air ( assumed constant).
Physics Electrostatics Level: University
Electric Field and Motion of Charge in itAn electron moving at a speed of 8.4 X 10^6 m/s passes between a pair of parallel plates that are vertically oriented with the plate on the right being positively charged and the plate on the left being negatively charged. The plates each have an area of 2.50 cm by 2.50 cm and they are separated by a distance of 0.50 cm. The uniform deflected? (b) By how much is the electron deflected after passing through these plates?
