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An unknown material has a normal melting/freezing point of -26.3° C, and the liquid phase has a specific heat capacity of 160 J/(kg · C°). One-tenth of a kilogram of the solid at -26.3° C is put into a 0.153-kg aluminum calorimeter cup that contains 0.105 kg of glycerin. The temperature of the cup and the glycerin is initially 25.1° C. All the unknown material melts, and the final temperature at equilibrium is 22.0° C. The calorimeter neither loses energy to nor gains energy from the external environment. What is the latent heat of fusion of the unknown material?
Under standard conditions, the density of air is 1.293 kg/m3 and that of helium is 0.178 kg/m3, What must be the minimum diameter of the spherical balloon
In order to manufacture these coffee tables, the company would need to incur $525,000 in fixed costs for new equipment. Calculate the break-even point of the coffee tables in units sold.
A 81.0kN spaceship comes in for a vertical landing. From an initial speed of 1.00 km/s, it comes to rest in 2.10min with uniform acceleration. What braking force must its rockets provide
A bird flies 3.6km due west and then flies 1.2km due north, What is the angle between the net displacement vectors of the 2 birds
Two small identical conducting spheres are placed with their centers 0.40 m apart. One is given a charge of 1.2 10-8 C, the other a charge of -1.6 10-8 C. Find the electrostatic force exerted on one sphere by the other
A parallel plate capacitor has square plates with sides of length 20 cm. The distance between the plates is 4 mm. The plates are charged up to 50volts, What is the energy stored by the capacitor
A polar bear starts at the North Pole. It travels 1.0 km south, then 1.0 km east, then 1.0 km north, What was the bear's average speed
For a camera equipped with a 51-mm focal-length lens, How far is the object from the image on the film
The resistance of a bagel toaster is 14 ?. To prepare a bagel, the toaster is operated for one minute from a 120-V outlet. How much energy is delivered to the toaster
q1. 0.55 kg block of ice is sliding through you on the very slippery floor at 3.6 ms. as it goes by you give it a kick
A parallel plate capacitor is constructed with plate area of 0.40 m^2 and a plate separation of 0.10mm. How much charge is stored on it
An 80.0-m-long brass rod is struck at one end. A person at the other end hears two sounds as a result of two longitudinal waves, What is the time interval between the two sounds
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