A light bulb is 4.1 m from a surface. how much luminous flux must the bulb produce if the illuminance required is 22 lx?

How many discovered planets are there

1. When is positive work done on a system? When is negative work done?

You should always wear your seat belt just in case the car comes to an abrupt stop. The seat belt will hold you in place so that your body does not continue moving when the car stops.

How many photons are in a laser pulse of 0.363J at 657 nm?

Does weight decrease when you're on the moon

4. How does an increase in orbital radius affect average orbital speed

What happens when a plastic lid sprinkled with iron filings is placed over a magnet?

A stuntman drives a car with a mass of 1500 kg on a drawbridge. The car accelerates with a constant force of 10,000 N. While he is driving, the drawbridge is raised to an incline of 30°.

In this channel of communication, messages are carried by sound and light waves. a. teleconference b. face-to-face c. voicemail d. hard copy memos

Cardiovascular exercise can