A 23 foot ladder is placed against a vertical wall of a building, with the bottom of the ladder standing on level ground 16 feet from the base of the building. How high up the wall does the ladder reach?

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?