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A point on the outer rim of a hollow disk (I = mr2) with radius 0.5m and mass 0.3 kg rotates with a constant angular speed of 3 rad/s. What net torque is necessary to stop the disk in 10 seconds?
a particle with charge 8.30 nc is in a uniform electric field directed to the left. another force in addition to the
A ten pound car wheel has a moment of inertia of 0.3 kg m2. How much torque is required to stop the wheel
Two rocks are thrown off the edge of a cliff that is 15.0 m above the ground. The first rock is thrown upward, at a velocity of +12.0 m/s. The second is thrown downward, at a velocity of 12.0 m/s.
A heat engine that operates on a Carnot cycle uses a low-temperature reservoir at 25 oC and runs at an efficiency of 0.350. The working substance is nitrogen gas, and the gas chamber contains 7.10 x 1023 N2 molecules. What is the change in the therma..
two newly discovered planets follow circular orbits around a star in a distant part of the galaxy. the orbital speeds
A 45.3 g mass is attached to a horizontal spring with a spring constant of 14 N/m and released from rest with an amplitude of 37.2 cm. What is the velocity of the mass
An object is 12 cm in front of a concave mirror, and the image is 3.0 cm in front of the mirror. What is the focal length of the mirror
Helium-neon laser light of wavelength 1004.5 nm is sent through a 0.473 mm wide single slit. What is the width of the central maximum on a screen 1.58 m from the slit? Answer in units of mm
A nichrome wire is 1 m long and 1 x 10^-6 m^2 in cross-sectionalarea. When connected to a potential difference of 2 V, acurrent of 4 A exists in the wire. Find the resistivity of this nichrome.
You have been visiting a distant planet. Your measurements have determined that the planet's mass is two times that of earth but the free-fall acceleration at the surface is only one-fourth as large. What is the planet's radius
The 1 kg standard body has an acceleration of 2.00 m/s2 at 43° to the positive direction of the x axis. What is the net force in unit-vector notation
Electrons can be “boiled off” of a wire by heating the wire to sufficiently high temperature (typically well over 1000? C). Typically the electrons leave the wire with a fairly low speed which can be approximated as zero
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