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An engineer is developing an electric water heater to provide a continuous ("on demand") supply of hot water. One trial design is shown in the figure. (Figure 1) Water is flowing at the rate , the inlet thermometer registers , the voltmeter reads , and the ammeter reads current . Then the power (i.e., the heat generated per unit time by the heating element) is . Assume that the heat capacity of water is and that the heat capacity of the heater apparatus is . When a steady state is finally reached, what is the temperature reading of the outlet thermometer? What is the power at which the heater operates?
In a television picture tube, electrons strike the screen after being accelerated from rest through a potential difference of 20000 V. The speeds of the electrons are quite large.
An inductor (L = 400 mH), a capacitor (C = 4.43 F), and a resistor (R = 500 ?) are connected in series. A 50.0-Hz AC source produces a peak current of 250 mA in the circuit. (a) Calculate the required peak voltage Vmax. (b) Determine the phase ang..
The starter motor of a car engine draws an electric current of 42.0 A from the battery. The copper wire to the motor is 6.00 mm in diameter and 1.71 m long, What is the current density in the wire
A tennis player receives a shot with the ball (0.060 0 kg) traveling horizontally at 50.5 m/s and returns the shot with the ball traveling horizontally, What is the impulse delivered to the ball by the tennis racquet
A solenoid in MRI is 2.40 m long, 94 cm in diameter, and 1200 turns of superconducting wire. Find a) inductance, b) induced emf in the solenoid while the current in the wire is changing from 0 to 2.5 kA in 30 s.
A horizontal force of 80N is required to push a piece of furniture across a floor at a constant velocity, what is the net force acting on the furniture
An ideal spring has the spring constant k = 428 N/m. find the distance this spring must be stretched from its equilibrium position for 28 J of work to be done.
A second baseman tosses the ball to the first baseman, who catches it at the same level from which it was thrown, What is the horizontal component of the ball's velocity just before it is caught
Consider a model thermodynamic system in which the allowed (nondegeerate) energy levels are 0, E, 2E, 3E. Determine how many macrostates are possible
If a current of 80.0 mA exists in a metal wire, In what direction do the electrons travel with respect to the current
Your motorboat can move at 30km/h in still water. How much time would it take you to move 12km upstream, in a river flowing at 6km/h.
A projectile is shot from the ground at an angle of 55 degrees with respect to the horizontal,find the horizontal component and the vertical component of initial velocity
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