What causes friction between two solid forces? After the roughness of the surfaces, what most affects the frictional force experienced

A SMA wire in the un-stretched condition is then given an initial strain of εo (to preload the wire) at room temperature (RT). Its ends are then rigidly fixed. What force is developed in the wire?

A 180 pound person dives off of a 30 foot cliff. What is their velocity as they enter the water? Provide step by step

An aircraft travels 1400 km at a speed of 700 km/h and then runs into a headwind that reduces its speed over the ground to 500 km/h for the next 800 km. What is the total time for the flight? What is the average speed?

A common characteristic of sound waves is that they A. Are created by vibrations B. Travel in straight lines toward the source C. Travel fastest through empty space D. Move at the speed of light

Pluto orbits the Sun at an average distance of 5.91 * 10^12 meters. Pluto's diameter is 2.30 * 10^6 meters and its mass is 1.31 * 10^22 kilograms. Charon orbits Pluto with their centers separated by a distance of 1.96 * 10^7 meters.

An empty capacitor is connected to a 12.0 V battery and charged up. The capacitor is then disconnected from the battery, and a slab of dielectric material (dielectric constant "k" = 2.8) is inserted between the plates.

how long can you afford to stop for lunch if you can drive a steady 90 km/h on the highway and must take a 225 km trip in 210 min?

Which layer of the Sun's atmosphere is farthest from the surface of the Sun? A) troposphere B) corona C) chromosphere D) photosphere

Which of the following is a supersonic speed? Mach 0.005 Mach 0.05 Mach 0.5 Mach 5

How do you solve this equation ___ Al + ___ Na1 O1 H1 - ___Na3 Al1 O3 + __ H2