An incandescent 100W light bulb costs $0.40 and lasts 1200 hours. A compact fluorescent light bulb which outputs the same amount of light uses only 23W, costs $3.65 and lasts 10,000 hours. Compare the cost of buying and using incandescent lights for 10,000 hours versus a compact fluorescent light bulb. Assume electricity costs $0.15 per kWh

1400 kg car has a speed of 27 m/s. if it takes 7 s to stop the car, what is the impulse and the average force acting on the car?

In a system, when potential energy decreases, then entropy also decreases. true false

You have a resistor and a capacitor of unknown values. first, you charge the capacitor and discharge it through the resistor. by monitoring the capacitor voltage on an oscilloscope, you see that the voltage decays to half its initial value in 2.70 miss . you then use the resistor and capacitor to make a low-pass filter. what is the crossover frequency fc?