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What net torque is required to make a solid 50 kg disk (I = ½ mr2) with a radius of 0.7 m experience an angular acceleration of 30 rad/s/s?
A star is moving away from us at a speed of 0,05c. If a spectroscopic line from an atom in the star has a wavelength 1050 nm in its rest frame, what is the wavelength of that line as seen with us?
An electric dipole consisting of charges of magnitude 1.90 nC separated by 7.00 µm is in an electric field of strength 1190 N/C, find the difference between the potential energies for dipole orientations parallel
calculate the first and second order angles for light of wavelength 675 nm for a diffraction grating contains 8000
A 15 N block lifted straight upward by a hand applying a force of 15 N has an initial kinetic energy of 7 J. What is the block's final kinetic energy
Determine the first two natural frequencies and mode shapes for ben ding vibration by using the Ritz deflection function .
An elevator weighing 20,000 N is supported by a steel cable. What is the tension in the cable when the elevator is being accelerated upwards at a rate of 3.00 m/s2
The half-life of a sample of 1011 atoms that decay by alpha particle emission is 10 min. How many alpha particles are emitted in the time interval from 10 min to 100 min?
A professional skier reaches a speed of 56m/s on a 30 degrees ski slope. Ignoring friction, what is the minimum distance along the slope the skier would have had to travel, starting from rest?
When resistors 1 and 2 are connected in series, the equivalent resistance is 21.4 ?. When they are connected in parallel, the equivalent resistance is 4.08
The distance from earth to the center of our galaxy is about 30,000 light years (1 ly = 1 light year = 9.47 x 10^15 m), how long will it take to make the trip
A constant current of I = 15 A exists in a solenoid whose inductance is L = 42.2 H. The current is then reduced to zero in a certain amount of time. If the current goes from 15 to 0 A in a time of 75 ms, what is the emf induced in the solenoid
They claim that he is able to jump and remain in the air for two full seconds from launch to landing. Evaluate this claim by calculating the maximum height that such a jump would attain. For comparison, Jordan's maximum jump height has been estim..
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