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A student sits on a rotating stool holding two 4 kg objects. When his arms are extended horizontally, the objects are 0.8 m from the axis of rotation, and he rotates with angular speed of 0.74 rad/sec. The moment of iner- tia of the student plus the stool is 6 kgm2 and is assumed to be constant. The student then pulls the objects horizontally to a radius 0.32 m from the rotation axis.
a) Calculate the final angular speed of the student. Answer in units of rad/s
b) Calculate the change in kinetic energy of the system. Answer in units of J
A 650 kg elevator starts from rest. It moves upward for 4.50 s with constant acceleration until it reaches its cruising speed, 1.75 m/s. What is the average power of the elevator motor during this period
A 18.0-kg projectile is fired at an angle of 60.0° above the horizontal with a speed of 73.0 m/s. How much energy is released during the explosion
Knowing the temperature at the surface of the Earth to be 72 Find the temperature at the surface of Venus
A proton accelerates from rest through 1500 volts. the proton then enters a region of space where the magnetic field is 0.3 tesla (and this field is perpendicular to the velocity). calculate the radius of the resulting circular motion?
An airplane has an effective wing surface area of 15 m2 that is generating the lift force. What is the weight of the plane
A child on a boat throws a 5.40 kg package out horizontally with a speed of 12.0 m/s. determine the velocity of the boat immediately after, assuming it was initially at rest. The mass of the child is 26.5 kg and the mass of boat is 55.5 kg.
A ball is thrown nearly vertically upward from a point near the edge of a tall building. it misses the edge of the building in ts way down and passes a point 160ft below its starting point 5 seconds after it leaves the thrower's hand.
A series ac circuit is shown. The inductor has a reactance of 80 Omega and an inductance of 200 mH. A 90- Omega resistor and a capacitor whose reactance is 130 Omega , are also in circuit. The rms current in the circuit is 1.3A. What is the phase ..
instructions read the problems carefully and answer all the questions in each problem. you are allowed to use three a4
A uniform magnetic field B is perpendicular to the plane of rotation. What is the potential difference between the ends of the bar
You push with a 20N horizontal force on a 2 kg mass resting on the horizontal surface against a horizontal friction force of 12N. What is the acceleration.
To stretch a certain spring by 2.70cm from its equilibrium position requires 8.00J of work. What is the force constant of this spring
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