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a copper rod had an initial diameter of 4.0 mm and an initial cross-sectional area of (pi)d^2/4=12.6 mm^2. What was the rod's final cross-sectional area if it expanded by .775mm when heated from 23.8degreeC to 99.2degree C.
A 140-m-wide river flows due east at a uniform speed of 3.9 m/s. A boat with a speed of 7.8 m/s relative to the water leaves the south bank pointed in a direction 39o west of north. How long does it take for the boat to cross the river
How much heat flows from 1.00 kg of water at 46.0°C when it is placed in contact with 1.00 kg of 22°C water in reaching equilibrium, What is the change in entropy due to this heat transfer
How far did you travel on this trip? What was your average speed.
A person pushes a 19.6-kg shopping cart at a constant velocity for a distance of 27.3 m on a flat horizontal surface. What is the magnitude of the force that the shopper exerts
A 0.50 microF and a 1.4 microF capacitor (C1 and C2, respectively) are connected in series to a 15-V battery, Calculate the potential difference across each capacitor
A soccer ball is kicked with an initial horizontal velocity of 18 m/s and an initial vertical velocity of 13 m/s, What is the initial speed of the ball, What is the initial angle of the ball with respect to the ground
Point P is at a potential of 500.0 kV and point S is at a potential of 200.0 kV. by how much does its kinetic energy change
An iron bar 50 cm long is raised to a copper bar 60 cm long and of the same diameter. What is the heat flow down the rod if its cross-sectional area is 2.50 cm2
two vehicles of equal mass at a 90 degree intersection. If the momentum of vehicle A is 1.20 x 10^5 kg km/h east and the momentum of vehicle is 8.50 x 10^4 kg km/h north, what is the resulting momentum of the final mass
Light from an argon laser strikes a diffraction grating that has 5395 grooves per centimeter. Determine the wavelength of the laser light
A point source emits 26.2 W of sound isotropically. A small microphone intercepts the sound in an area of 0.121 cm2, determine the power intercepted by the microphone
The driver of a car slams on the brakes when he sees a tree blocking the road. The car slows uniformly with acceleration of -5.90 m/s2 for 4.45 s, With what speed does the car then strike the tree
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