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A battery has an emf of 15.0 V. The terminal voltage of the battery is 13.1 V when it is delivering 18.0 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?
Suppose the force on an object is (5i-8j) N over a displacement of (5i+2j) meters. How much work is done by that force
A Styrofoam slab has thickness h and density ?s . When a swimmer of mass m is resting on it, Find the area of the slab
A 1-cm-thick layer of water stands on a horizontal slab of glass. What is the maximum angle of incidence for which the light ray can emerge into the air above the water
You are pushing a 150-kg wooden crate in a straight line a distance of 4.5 m across a wooden floor. The crate is speeding up at 0.22 m/s2. What is the work done by friction on the crate
A pulley with a radius of 10.0 cm is mounted on an axle that passes through the center of the pulley. calculate the instantaneous angular speed of the pulley
A skier of mass 68.4 kg glides down a hill of slope 26.5 degree at constant speed. find the coefficient of friction between her skis and the slope
the index of refraction for silicate flint glass is 1.66 for violet light that has a wavelength in air equal to 400 nm
A block of silver, mass ms = 2.05 kg, is heated in a furnace to temperature Ts, but remains solid. It is now dropped on a block of ice, mass mi = 550 g and temperature Ti = 0o C. The combination reaches equilibrium at temperature Tf = 35.4 o C. Find ..
A 0.50-kg mass is attached to a spring of spring constant 20 N/m along a horizontal, frictionless surface. What is the amplitude of vibration
A useful model of a water molecule is sketched in the figure below, with point charges of 5.2 10-20 C at the H sites, What is the total electric potential energy of this model of a water molecule
A particle with a mass of 7.43 multiply.gif 10-27 kg has a de Broglie wavelength of 8.37 pm. What is the particle's speed
A projectile is fired horizontally from a gun that is 47.0 m above flat ground; emerging from the gun with a speed of 250 m/s.
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