A 60-Watt bulb illuminates a surface a distance d away with an illuminance of 1800 lux. What would be the illuminance
on a surface the same distance away if illuminated by a 30-
Watt bulb?

Janelle made a hypothesis bout the uneven temperatures inside her house during winter. she believes that 50% of the ducts are blocked and she plans to investigate. if she wants to prove her hypothesis using scientific processes what should she do next?

When a 5.0kg cart undergoes a 2.2m/s increase in speed, what is the impulse of the cart

The astronauts on the space shuttle flights experienced an acceleration of 29 m/s2 (about 3 "g's") during lift-off. what upward force must the astronaut's seat apply to the astronaut in order to cause this acceleration? assume the astronaut's mass is 70 kg, and compute this force when the acceleration is near the earth's surface so their weight equals latex: mg m g .