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A student sits on a rotating stool holding two 3.2-kg objects. When his arms are extended horizontally, the objects are 1.0 m from the axis of rotation and he rotates with an angular speed of 0.75 rad/s. The moment of inertia of the student plus stool is 3.0 kg · m2 and is assumed to be constant. The student then pulls in the objects horizontally to 0.48 m from the rotation axis. (a) Find the new angular speed of the student. 1.66J . Your response is within 10% of the correct value. This may be due to roundoff error, or you could have a mistake in your calculation. Carry out all intermediate results to at least four-digit accuracy to minimize roundoff error. rad/s (b) Find the kinetic energy of the student before and after the objects are pulled in. before 2.31J . Your response differs from the correct answer by more than 10%. Double check your calculations. J after 5.1 J Your response is within 10% of the correct value. This may be due to roundoff error, or you could have a mistake in your calculation. Carry out all intermediate results to at least four-digit accuracy to minimize roundoff error. J
A rescue helicopter lifts a 85 kg person straight up by means of a cable. How much work is done by the tension in the cable
The speed of a particle moving in a circle 2.0 m in radius increases at the constant rate of 4.4 m/s2. what is the speed of the particle
Calculate the electric flux through the circle when its face is perpendicular to the field lines and then when at 45 degrees to the field lines
An object with a mass of m = 4.8 kg is attached to the free end of a light string wrapped around a reel of radius R = 0.225 m, Determine the magnitude of the acceleration of the object
A solenoid 7.5 cm in radius and 88m in length has 9800 uniformly spaced turns and carries a current of 3.5 A. What is the magnetic flux through this circular surface
The mass of a newborn baby's brain has been found to increase by about 1.6 mg per minute. How much does the brain's mass increase in one day? How long does it take for the brain's mass to increase by 0.0045 kg ?
A subway train starts from rest at a station and accelerates at a rate of 1.50m/s2 for 14.2s . It runs at constant speed for 69.6s and slows down at a rate of 3.51m/s2 until it stops at the next station. find total distance covered? express answer..
A 85.9-kg baseball player slides into second base. The coefficient of kinetic friction between the player and the ground is ?k = 0.561. If the player comes to rest after 1.27 s, what is his initial speed
In a television set, the power needed to operate the picture tube comes from the secondary of a transformer. Determine the secondary voltage
A 2kg mass is loaded into a spring cannon. The cannon's spring has a constant k = 4000 abd the spring is compressed 0.8m. How far does it move before it comes to a stop
A mass m1 = .80 kg sits on a table. The coefficient of kinetic friction between the mass and table is .10. What is the linear acceleration of the masses
Two point charges, q1 = 2.0 pC and q2 = -2.0 pC, are separated by 5.6 µm. 1) What is the dipole moment of this pair of charges?
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