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1. A flashlight is made by drawing current from a 1.58 A · h, 1.44 V battery through a light emitting diode (LED). The LED draws a current of 36.0 mA.
(a) Determine the power delivered to the LED.
(b) Determine how many hours a fresh battery will power the flashlight.
2. A homemade capacitor is made from a sandwich of a piece of paper (9.0 in. by 15 in., 0.0033 in. thick) between two equal area sheets of aluminum foil.
(a) Calculate the capacitance of this device.
(b) What maximum potential can be put across it?
(c) How much energy can be stored in it at maximum voltage?
A 1.80Kg brick is sliding next to on a rough horizontal surface at 13.5m/s .If the brick stops in 4.80, how much mechanical energy is lost.
An electric vehicle starts from rest and accelerates at a rate of 1.6 m/s2 in a straight line until it reaches a speed of 20 m/s. The vehicle after that slows at a constant rate of 1.4 m/s2 until it stops. (1) How much time elapses from start to s..
Two small charges with a mass of 1.0 g each are connected by a 2.0 cm long insulating rod of negligible mass. What is the dipole moment of the rod
Coherent light with wavelength 599 passes through two very narrow slits, and the interference pattern is observed on the screen a distance of 3.00 from the slits. The first-order bright fringe is a distance of 4.84 from the center of the central b..
A 2.6kg block slides along a frictionless surface at 2.0m/s . A second block, sliding at a faster 5.0m/s, collides with the first from behind and sticks to it. What was the mass of the second block
During a portion of the Carnot cycle, a dilute gas of diatomic nitrogen is compressed slowly at constant temperature, T = 280 K. How much energy was transferred to the environment through heating or cooling
Two long parallel wires each carry 2.3A in the same direction, with their centers 1.5cm apart. Find the magnitude of the force of interaction
An object gets a variable acceleration (in m/s2) that changes with time according to the equation: a(t)= 5.0-1.4t 0
The Earth is showered with particles from space known as muons. They have a charge identical to that of an electron but are many times heavier (m = 1.88·10-28 kg). What will be the radius of the resulting orbit of the muon
A person consumes 1800 Calories per day (about seven Dunkin' Donuts). How much would seven Dunkin' Donuts cost
A current of 1.00 Amperes is maintained in a simple circuit with a total resistance of 3.00 ohms. How much heat is generated in 4.00 s
A DC motor connected to a 120 V power supply develops a back emf of 70 V when running at full speed. If the armature coils have a total resistance of 2.5μ, calculate the power (P = I2R) lost as heat in the coils.
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