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The temperature of 600 g of cold water rises by 15 C when 300 g of hot water at 50 C is added to it. What was the initial temperature of the cold water ?
Explain why the pitch of an object approaching an observer (such as a fire truck with its siren on) differs from the pitch as it moves away from the observer. Remember that pitch is the brain's interpretation of a sound's frequency.
A cylindercontains a mixture of helium and argon gas in equilibrium at atemperature of 149°C. What is the rms speed of each type of molecule
Which of the following forces does the most work?
a 20000 kg rocket has a rocket motor that generates 3.0times105 n of thrust. what is the rockets initial upward
The motor of a fan turns a small wheel of radius rm = 2.23 cm. This wheel turns a belt, which is attached to a wheel of radius rf = 3.07 cm that is mounted to the axle of the fan blades. Measured from the center of this axle, the tip of the fan bl..
q1. a music fan at a swimming pool is listening to a radio on a diving platform. the radio is constant frequency when
A parallel-plate capacitor is made of two flat metal plates pressed against a thin slab of dielectric material. What is the dielectric constant of the material that was initially used to fill the gap between the plates
If the height of the water slide is h = 3.2m, and the person's initial speed at point A is 0.54m/s, what is the newhorizontal distance between the base of the slide and thesplashdown point of the person?
How much work must this force do to stop the wheel. An electron moving along the x axis has a position given by x = 11te-1t m, where t is in seconds. How far is an electron from the origin when it momentarily stops.
An aquarium filled with water (n=1.33) has flat glass sides whose index of refraction is 1.52. What is the critical angle from the glass to the water
the suns rays are focused using a lens as a burning glass. all the visible sunlight entering a lens of radius 2.97 cm
A cannonball is launched from the ground at an angle of 45o above the horizontal and a speed of 45 m/s. With no air resistance, find with what speed ball will land on the ground
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