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Suppose that 250g of water at 85oC is mixed with 25g of ice at 0oC in an insulated container of negligible heat capacity. [Lf,water=33.4*104J/kg, cwater = 4186J/kgoC]
a. What is the final temperature of the system?
b. How much of the ice has melted?
A package is dropped from a helicopter moving upward at 15 m/s. If it takes 24 s before the package strikes the ground, how high above the ground was the package
Starting from rest, a 4.50-kg block slides 3.00 m down a rough 30.0° incline. The coefficient of kinetic friction between the block and the incline is ?k = 0.436. Determine the work done by the force of gravity
One recent study has shown that x rays with a wavelength of 0.0034 nm can produce mutations in human cells. (a) Calculate the energy in eV of a photon of radiation with this wavelength. eV (b) Assuming that the bond energy holding together a water mo..
A 7.75 H inductor with negligible resistance is placed in series with a 15.7 V battery, a 3.00 ? resistor, and a switch. The switch is closed at time t = 0 seconds. Calculate the current as time approaches infinity
A sonar echo returns to a submarine 1.40 s after being emitted. What is the distance to the object creating the echo
A 0.495-kg mass is attached to a horizontal spring with k = 105 N/m. The mass slides across a frictionless surface. Find the mechanical energy of the system
A 250 N force is applied at a37° angle to the surface of theend of a square bar. The surface is 4.00 cm on a side. What is the shear stress on the bar
A weightlifter lifts 200 kg from the floor to a height of 2 m in 2 s. How much work did the weightlifter perform
Suppose that subsequent to this heating, 2.00 104 J of thermal energy is removed from the gas isothermally. Find the final volume in terms of the initial volume of the example
A block of mass 4.0 kg is attached to a string and the string is attached to a spring(k=32.0N/m). What is the maximum extension of the spring
A playground swing at its highest point during a child's play is 3.0 meters above the ground, Determine the torque exerted by gravity on a child on the swing when the swing is at the highest point of its motion
Two long parallel wires are separated by 3.2 mm. The current flowing in one of the wires is twice that in the other wire. what are the values of the two currents
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