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1. The circular blade of a power saw has kinetic energy 44 J. If its rotation rate drops to half, what's its new kinetic energy?
2. A revolving door consists of four rectangular glass slabs, with the long end of each attached to a pole that acts as the rotation axis. Each slab is 2.20 m tall by 1.25 m wide and has mass 35.0 kg.
(a) Find the rotational inertia of the entire door.
(b) If it's rotating at one revolution every 9.0 s, what's the door's kinetic energy?
3. A 145-g baseball has radius 3.7 cm. (a) Assuming uniform density, what's its rotational inertia? (b) The ball is pitched at22 m/s with spin rate 20 Hz. Find and compare the ball s translational and rotational kinetic energies.
4. A wheel consists of 20 thin spokes, each with mass 0.055 kg, attached to a rim of mass 4.2 kg and radius 0.75 m. Find its rotational inertia.
A spring with a force constant of 1645 N/m is compressed 11.1 cm. Find the work done by the force compressing the spring
A rope with 300 g of mass per meter is under 580 N tension. A wave with frequency 3.1 Hz and amplitude 6.5 cm is propagating on the rope
In a sample of Ar gas at 24 oC and 5.00 bar, calculate the number of collisions per second for a given atom. The diameter of an atom of Ar is 194 pm.
Two people hear a tornado siren, but one listener is 22.5 times farther away from the source of the sound than the other. What is the intensity level (in dB) at the farther listener relative to the other listener
The electric field on the surface of a 10cm diameter sphere is perpendicular to the sphere and has magnitude37 kN/C. What is the electric flux through the sphere?
A broad source of light (λ=589 nanometer) illuminates normally two glass plates 12 centimeter long hat touch at one end, Find how many bright fringes appear over the 12 centimeter distance
How long does it take the swimmer to cross the river
An object is launched upward with an initial speed of 96 ft / sec over the side of a 256ft cliff. Find the objects maximum height and its speed when it hits the ground
The rms current in a copy machine is 5.26 A, and the resistance of the machine is 19.7?. find the peak power delivered to the machine
A 2 kg rock is released from rest at a height of 29 m. neglect air resistance and determine the kinetic energy, gravitational potential energy, and total mechanical energy at each of the following heights: 20m; 15m; 5m; 9m.
An alpha particle with kinetic energy 17 MeV makes a head-on collision with a lead nucleus at rest. What is the distance of closest approach of two particles.
What is his final velocity?
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