Which does not contain a lens?

A.

a floodlight

B.

eyeglasses

C.

a glass eye

D.

a jeweler's loop

Hardness may be defined as the resistance of a material to scratching. a. True b. False

Compound name for rb3n

A loudspeaker in a parked car is producing sound whose frequency is 20950 Hz. A healthy young person with normal hearing is standing nearby on the sidewalk but cannot hear the sound because the frequency is too high.

If an inclined plane is 5 m long and 2 m high, what is its mechanical advantage? A. 2.5 B. 3 C. 7 D. 10

A circuit contains three light bulbs in parallel. After observation, a fourth light bulb is added, also in parallel. How does the intensity of the four light bulb circuit compare with the intensity of the three light bulb circuit?

A spring (k = 790 N/m) has a length of 48 cm when zero net force is applied to it. What will its length be when 230 N of force is applied to stretch it? Question 3 options: 3.4 m 0.77 m 3.9 m 0.29 m

Inert gas used to make bright city lights True or False

A boulder on top of a cliff has a potential energy of 12400J. How high above is the boulder?

If the graph represents speed what is measured on the x and y axes

It is difficult to lift a heavy stone than the lighter one on the earth, why?