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Part A
Approximately how long should it take 9.3 kg of ice at 0 °Cto melt when it is placed in a carefully sealed Styrofoam ice chest of dimensions 25 cm x 35 cm × 55 cm whose walls are 2.0 cm thick? Assume that the conductivity of Styrofoam is double that of air and that the outside temperature is 35 °C.
Express your answer using two significant figures.
A 2.2 A current is flowing in a 18 H inductor. A switch is opened, interrupting the current in 2.0 ms. Find the induced emf in the inductor
In the series ac circuit where R = 420Ω, L = 0.20 H, C =1.2 μF (10-6), the ac power supply is ε = 60 sin(1500 rad/s t) V.
If the astronaut moves farther away from shuttlecraft to a distance of 23.0 m, what is the change in gravitational potential energy for the astronaut's huttlecraft system?
How many 104 W lightbulbs can you use in a 102 V circuit without tripping a 17 A circuit breaker? (The bulbs are connected in parallel that means that the potential difference across each lightbulb is 102 V.)
A system consists of two positive point charges, q1 and q2>q1. The total charge of the system is +62.0 x 10^-6 C, Find q1 and q2
A student uses an audio oscillator of adjustable frequency to measure the depth of water well. How deep is the well
An electron confined in a harmonic potential well emits a 1280nm photon as it undergoes a 5 ? 4 quantum jump. What is the spring constant of the potential well
An electron is moving at a constant speed of 15 m/s on a circle of radius 2.2 m. Express the circumference of the circle C in terms of its radius R.
On a spacecraft two engines fire for a time of 589 s. One gives the craft an acceleration in the x direction of ax = 5.05 m/s2, Calculate the magnitude of the initial velocity
A 6-kg stone is tied to a 0.79-m long string and swung around a circle at a constant angular velocity of 19 rad/s
One type of ink-jet printer, called an electrostatic ink-jet printer, forms the letters by using deflecting electrodes to steer charged ink drops up and down vertically as the ink jet sweeps horizontally across the page. The ink jet forms 32.0μm -..
A 119-turn circular coil of radius 2.01 cm is immersed in a uniform magnetic field that is perpendicular to the plane of the coil. calculate the magnitude of the average EMF
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