What problem did thomas edison encounter after he invented the electric lightbulb?

1) What is the power in horsepower of a 100 watt light bulb? What is the power in kilowatts of a 200 horsepower engine? 2) If a cars engine is providing 3000 N of force to keep the car moving at 5 m/s, what is the engine's effective power?

A resistor R1 is wired to a battery, then resistor R2 is added in series. (a) Is the potential difference across R1 now more than, less than, or the same as previously?

A canoeist on a lake throws a 0.145 kg baseball at 20.0 m/s to a friend in a different canoe. Each canoe with its contents has a mass of 120 kg, and is at rest initially.

you add 8950 J of heat to 174 g of iron. What is the temperature of the iron (c=452 J / (kj * C degrees)) ?

Which has more KE, a large truck moving at 50m/s or a bicycle moving at 10m/s?

A sound from a source has an intensity of 270 db when it is 1 m from the source. what is the intensity of the sound when it is 3 m from the source?

What experimental term is it when a ruler is dropped to the floor?

Where is most of the energy from incoming waves focused? A. spit B. headland C. underwater D. barrier beach

Exoplanets (planets outside our solar system) are an active area of modern research. Suppose you read an article stating that there is a newly discovered planetary system with three planets.

A car with a mass 1200 kg accelerates at 1.89 m/s2. What is the total force exerted by the car on the road (answer in N to two decimal places) ?