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An unknown material has a normal melting/freezing point of -25.1° C, and the liquid phase has a specific heat capacity of 160 J/(kg · C°). One-tenth of a kilogram of the solid at -25.1° C is put into a 0.161-kg aluminum calorimeter cup that contains 0.108 kg of glycerin. The temperature of the cup and the glycerin is initially 24.7° C. All the unknown material melts, and the final temperature at equilibrium is 21.6° 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?
A block is given an initial velocity of 7.0 m/s up a frictionless 24 degree incline. find the block's acceleration as it slides up the plane
How to find out the elapsed time
In a purely inductive circuit of 36 mH, the freq is 71 Hz and the maxium voltage is 317 V. Find the rms current in the circuit
Engineers can determine properties of a structure that is modeled as damped spring oscillator-such as a bridge-by applying a driving force to it, What is the oscillator\'s damping constant? (kg/s)
Take the gravitational constant to be = 6.67×10^-11 Nm^2/kg, the mass of the earth to be = 5.97×10^24 kg, and the radius of the Earth to be = 6.38×10^6 m.
Water has a mass per mole of 18.0 g/mol, and each water molecule (H2O) has 10 electrons. What is the net charge of all these electrons
An 24 g rifle bullet traveling 370 m/s buries itself in a 4.8 kg pendulum hanging on a 2.6 m long string, which makes the pendulum swing upward in an arc. find the maximum vertical displacement of the pendulum.
One end of a brass bar is maintained at 305 oC, while the other end is kept at a constant, but lower, temperature. What is the temperature of the bar at a point 0.129 m from the hot end
A helicopter has blades of length 4.0 m, rotating at 1.0 rev/s about a central hub, find the emf induced between the blade tip and the central hub
Two 5.0cm×5.0cm metal electrodes are spaced1.1mm apart and connected by wires to the terminals of a 9.0 V battery. What is the potential difference between electrodes
A. 0.145 kg baseball is pitched at 42 m/s. The batter hits it horizontally to the pitcher at 58 m/s. What is the change in momentum of the ball
Estimation instantaneous rate of evaporation
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