If a star is 20 light minutes away and it stops creating light, how long will it be before we stop seeing the light?

What is the speed of light in a vacuum

A jeweler is determining the optical properties of an unknown blue gemstone. She uses an angle of incidence of 62°, and measures an angle of refraction of 30°. Assuming the index of refraction of air is 1.

The lava lamp has a light bulb as a heat source at its base. The lamp contains a colored, waxy fluid that can be observed moving in clumps through a clear liquid.

Which type of seismic wave produces the most severe ground movements?

5. Which is not true about a wave in the open ocean? D A Water particles move in a circular path. B As the wave travels, water particles pass the energy along by moving in a circle. O C Water particles travel with the wave.

When lava cools, what type of Rock forms?

A uniformly charged conducting sphere of 1.1 m diameter has a surface charge density of 6.2 µC/m2. (a) Find the net charge on the sphere. (b) What is the total electric flux leaving the surface of the sphere?

A blow-dryer and a vacuum cleaner each operate with a voltage of 120 V. The current rating of the blow-dryer is 12 A, while that of the vacuum cleaner is 5.7 A. Determine the power consumed by (a) the blow-dryer and (b) the vacuum cleaner.

4. A 40 kg child and a 30 kg child want to balance themselves on a 4 meter, 50 kilogramn see-saw. Where should the fulcrum be placed?

A 2-kg object is dropped from a height of 1000 m. What is the force of air resistance on the object when it reaches terminal velocity