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At a fabrication plant, a hot metal forging has a mass of 78 kg and a specific heat capacity of 430J/(kg·°C). To harden it, the forging is immersed in 710kg of oil that has a temperature of 32°C and a specific heat capacity of 3000 J/(kg·°C) . The final temperature of the oil and forging at thermal equilibrium is 47°C. Assuming that heat flows only among the forging and the oil, decide the initial temperature of the forging.
A 62.8 kg canoeist stands in the middle of her canoe. The canoe is 3.3 m long, and the end that is closest to land is 2.5 m from the shore. What is the canoe's mass
There is evidence that elephants communicate via infrasound, generating rumbling vocalizations as low as 14 Hz that can travel up to 10 km. The intensity level of these sounds can reach103dB, measured a distance of4.5m from the source. Determine the ..
Suppose a heat engine has an efficiency of 0.201 and produces 1.09×104 J of work. How much energy is pulled in from the hot reservoir? How much energy is rejected by the engine? (This energy is "exhausted" to the cold reservoir.))
A 150-gm ball is attached to a 3-m long string to form apendulum. The pendulum is pulled until it forms an angle of 45degrees with the vertical. calculate its maximum speed after it was released
A person of mass 72 stands at the center of a rotating merry-go-round platform of radius 3.40 and moment of inertia 950. The platform rotates without friction with the angular velocity 0.95. The person walks radially to the edge of the platform.
A mass-spring system oscillates on a horizontal frictionless surface with an amplitude of 3.06 cm. If the spring constant is 260 N/m and the mass is 0.470 kg, determine the mechanical energy of the system
What is the maximum positive potential energy. Write down an expression for U as a function of x, with U in joules and x in meters.
An astronaut on a spaceship traveling at 0.75c relative to Earth measures his ship to be 29m long. On the ship, he eats his lunch in 23min. What length is the spaceship according to observers on Earth
how many drops of water are in all the oceans on earth? assume that 1cm3 contains 25 drops of water. remember that this
A nanowire is a (nearly) one-dimensional structure with a diameter on the order of a few nanometers. What is the tension in the middle
A free electron is placed between two large, parallel,nonconducting plates that are horizontal and 1.6 cm apart. One plate has a uniform positivecharge; the other has an equal amount of uniform negative charge.The force on the electron due to the ..
An unstable particle at rest breaks up into two fragments of unequal mass. The mass of the lighter fragment is equal to 2.00 10-28 kg, what is the speed of the heavier fragment
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