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A battery has an emf of 15.0 V. The terminal voltage of the battery is 10.2 V when it is delivering 24.0 W of power to an external load resistor R.
(a) What is the value of R?
_______?
(b) What is the internal resistance of the battery?
A 2.30-kg object is attached to a spring and placed on frictionless, horizontal surface. Find the maximum acceleration of the object
A hanging iron wire with diameter 0.15 cm is initially 2.4 m long. When a 184 kg mass is hung from it, Find the approximate value of the effective spring stiffness of the interatomic force
A 0.70-m-diameter solid sphere can be rotated about an axis through its center by a torque of 12.8m?N which accelerates it uniformly from rest through a total of 170 revolutions in 14.0s
A bird is launched at a speed of 25 meters per second at an angle of 29(deg) to horizontal from a height of 1.3m above the ground, write the velocity vector in component form
On an essentially frictionless horizontal ice-skating rink, a skater moving at 2.6 m/s encounters a rough patch that reduces her speed by 48 % to a friction force that is 20 % of her weight
suppose that they have same internal energy, which will have a higher temperature: a metal knife in thermal equilibrim with a hot griddle or a 1kg block of ice at -25C or seven 12g ice cubes at -25C.
A runner makes one lap around a track in 68.0s. The track is oval, has two straight 100m stretches with a semicircular bend (radius of 50m) at each end. What was the runner's total displacement for the lap
The core of an optical fiber has an index of refraction of 1.27, What is the critical angle for total internal reflection at the core-cladding interface
The record for the highest speed achieved in a laboratory for a uniformly rotating object was 2.01e3m/s for a 0.15m long carbon rod
a 2.0 nc charge is placed on the x-axis at x=-3.0cm another 2.0nc charge is placed on the x-axis at x=3.0cm, What is the potential at the origin
An engine of the orbital maneuvering system (OMS) on a space shuttle exerts a force of 2.64×104N j^ over a time interval of 4.50s, What is the impulse of the force for this time interval of 4.50 s
A bowling ball of mass 7.00kg is rolling at 3.00m/s along a level surface. Calculate the ball's rotational kinetic energy
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