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A solid sphere with a radius of 0.70 m can be rotated about an axis through its center by a torque of 10.5 N *m which accelerates it uniformly from rest through a total of 180 revolutions in 15.0 s. What is the mass of the sphere?
A device used in radiation therapy for cancer contains 0.52 g of cobalt-60 (59.933 819 u). Determine the activity (in Bq) of the radioactive material
A certain lightbulb has a tungsten filament with a resistance of 19.1 ? when at 20.0°C and 142 ? when hot. Find the temperature of the hot filament
q1. a sling-thrower puts a stone 0.250 kg in the slings pouch 0.010 kg and then begins to make the stone and pouch move
A 75g bungee cord has an equilibrium length of 1.2 m. The cord is stretched to a length of 1.8m, then vibrated at 20 Hz. What is the spring constant of the bungee cord
An electromagnetic wave has the wavelength of 42.6 ?m and intensity of 78.5 W/m^2. Find the momentum of one photon
A 2.0 kg ball swings in a vertical circle on the end of an 80cm long string. Calculate the speed, magnitude and direction of acceleration
An electron enters a region of space containing a uniform 0.0000199-T magnetic field. Its speed is 199 m/s and it enters perpendicularly to the field. Find the radius of the electron's orbit
How several meters away is a cliff if an echo is heard 0.587 s after the original sound? Assume that sound traveled at 343 m/s on that day.
How long after being thrown will the balls collide
A ball attached to a string is twirled in a circle of radius 1.25 m. If the constant speed of the ball is 2.25 m/s, what is the period of the circular motion
Consider a positive charge q that is released from rest at the origin in the orthogonal uniform electric and magnetic fields E = E yˆ and B = B zˆ.
In the figure, block 2 (mass 1.10 kg) is at rest on a frictionless surface and touching the end of an unstretched spring of spring constant 231 N/m. by what distance is the spring compressed
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