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Commercial cold-packs consist of solid ammonium nitrate and water. Ammonium nitrate absorbs 330 J of heat per gram dissolved in water. In a coffee-cup calorimeter, 2.00 g of ammonium nitrate are dissolved in 75.0 g of water at 30 degrees Celsius. Assuming that all of the heat is lost from the water, what is the final temperature of the water? The specific heat of water is 4.18 J C-1 g-1
A cat walks along a uniform plank that is 4.00 m long and has a mass of 7.00kg the plank is upported by two sawhorses. What is the mass of the cat
A proton moving eastward with a velocity of 5.0 x 103m/s enters a magnetic field of .20 T pointingnorthward. What is the magnitude and direction of the force that acts on the proton?
How many 185 W lightbulbs can you use in a 191 V circuit without tripping a 15 A circuit breaker? (The bulbs are connected in parallel, which means that the potential difference across each lightbulb is 131 V.)
A parallel-plate capacitor in air has a plate separation of 1.50 cmand a plate area of 25.0cm2. The plates arecharged to a potential difference of 2.50x102 V and disconnected from the source. The capacitor is then immersedin distilled water.
a stone is dropped from rest from the roof of a 100-m high building 2.00 s after that a second stone is thrown straight
A train is rounding a circular curve whose radius is 200 m. At one instant, the train has an angular acceleration of .0015 rad/s2, Determine the angle of the total acceleration relative to the radial direction
A 100 kg block is suspended from a string and immersed in water. The block has a volume of 0.02 m^3. The water density is 1000 kg/m^3. What is the buoyant force on the block
find out kinetic energy of ball at the highest point of motion.
The 22.5 g arrow is shot with a speed of 37.0 m/s and passes through the target, which is stopped by the impact. What is the speed of the arrow after passing through the target
An airplane of mass 1800 kilogram and flying at 540 km/h loops the loop in a circle of radius 250 meter. Obtain the downward thrust of air at highest point of loop
The skis have a thrust of 189 N and a coefficient of kinetic friction on snow of 0.1. Unfortunatately, the skis run out of fuel after only 9 s. Illustrate what is Sam's top speed?
Your roommate is working on his bicycle and has the bike upside down. He spins the 70.0cm -diameter wheel, What is the pebble's speed and acceleration
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