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Coffee is in an insulated cup 0.5 cm thick in the shape of a cube 10 cm on a side. The cup has a very small opening (its area is much smaller than the area of a square wall) through which coffee can be drunk. The temperature of the coffee is 95oC and the surrounding temperature is 21oC. Find the ratio of the heat loss due to conduction to the heat loss due to the radiation. Assume the emissivity of 1.0 and the thermal conductivity of cup of 2 x 10-4 cal/cm.s.°C. 1 x 10-3.
The energy density of radiation is 5.75E-14 j/m^3. The speed of light is 2.99E8 m/s, Determine the the corresponding electric field amplitude
An elevator cable breaks when a 975 kg elevator is 24.5 m above the top of a huge spring (k = 8.00 x 10^4 N/m) at the bottom of the shaft. Calculate the amount the spring compresses
The two circuits shown below are three mm apart. The 10 cm straight edge of circuit 1 experiences a net force of 5.4 x 10-5 N. What is the emf of the battery in circuit 2?
The practical limit for carbon-14 dating is about 60,000 years. If a bone contains 1.4 kg of carbon, and the animal died 55000 years ago, what is the activity today
A cannon is fired from the ground. The cannonball initially travels with a speed of 300 meter per second at an angle of 25o with respect to the ground. Calculate the cannonball maximum height
A 8 kg hammer strikes a nail at avelocity of 8.9 m/s and comes to restin a time interval of 8.0 ms. What is the impulse given to the nail
A light spring with a force constant of 12 is connected to a wall and to a 1.9 toy bulldozer, What is the numerical value of this coefficient of friction
A 599 Hz sound wave travels through a substance. What is the speed of sound in the substance
A transformer has 120 volts and 100 turns in the primary. The secondary has 500 turns and 600 volts. If the resistance of the secondary side is 150 ohms, find the secondary current
When a charge with q=2e moves under the influence of the electric force and an external force through a potential difference of -80V, The work done by the external force is
A student is sleeping under a small goose-down comforter that has coefficient of thermal conductivity of 0.025 W/m °C. what is the rate of heat flow through the comforter
a particle is projected vertically upwards with a velocity of v0 in a constant gravitational field. the medium offers a
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