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A 250 g weight is tied to a piece of thread wrapped around a spool, which is suspended in such a way that it can rotate freely. When the weight is released, it accelerates toward the floor as the thread unwinds.
Assume that the spool can be treated as a uniform solid cylinder of radius R=3 cm and mass Ms=300 g. Find the tension in the thread and the magnitude of the acceleration of the weight as it descends. Assume the thread has negligible mass and does not slip or stretch as it unwinds.
If the temperature is changed so that the thermometer has a resistance of 54, what is the temperature. Assume the cross-sectional area and the length of the wire remains the same.
a tennis ball is thrown from ground level with velocity vo directed 30 degree above the horizontal. if it takes the
In a head-on collision, a car stops in 0.30{\rm s} from a speed of 30{\rm m}/{\rm s}. What force is applied to the driver by his seat belt during that fraction of a second
Solid disk of radius 0.5m and mass 5kg is rotating countercw about central pivot with ω=10sec^-1. A constant fictional foce of 3N aplpied on outer edge is used to slow disk to a stop. How long in time does it take for the disk to stop? How many re..
An object moves up and down y-axis with an acceleration given as a function of time t by the expression a = A sin ω t, where A and ω are constants. What is the period of this motion.
A transformer consisting of two coils wrapped around an iron core is connected to a generator and a resistor, as shown in the drawing. There are 11 turns in the primary coil and 19 turns in the secondary coil. The peak voltage in the resistor is 65 V..
There is well known gravitational red shift of real photons. What about gravitational red shift of virtual photons of charged neutron star? Is electrostatic force become weaker while mass of charged neutron star is growing?
Two newly discovered planets follow circular orbits around a strain a distant part of the galaxy. Find the orbital period of the faster planet
A cylindrical lead rod with a diameter of 2.54 cm and a length of 76.2 cm is initially at a temperature of 20.0 C. After reaching equilibrium, what is the final temperature of the rod and the mercury
A skateboarder shoots off a ramp with a velocity of 6.9 m/s, directed at an angle of 56 ° above the horizontal. The end of the ramp is 1.1 m above the ground. how far is this point horizontally from the end of the ramp
A 0.650 MeV x-ray is Compton scattered at 90° by a free electron in an aluminum foil. a) What is the wavelength of the incident photon? b) What is the wavelength of the scattered photon? c) What is the energy of the recoiling electron?
Calculate the maximum torque on the current loop. Show the direction of the torque relative to the wire( (Show drawing/figure for full credit).
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