Does friction depends on the nature of two syrfaces which are in contact with each other

What is the total resistance of the circuit shown below?

Heather drops a ball weighing 0.50kg a distance of 2.0m. If the speed of the ball right after it bounces is the same speed of the ball right before it bounces, and the interaction time between the ball and the floor was 0.

A 5 kg block accelerates across a horizontal surface at 7 m/s^2 when you exert a 60 N force on it. What is the force of friction on the block (Ffs/b) ? If you don't mind finding the kinetic friction coefficient too?

You have a device that takes temperature measurements and runs off of solar power. How often it is programmed to take a measurement will affect how much power it uses--more frequent measurements, more power.

The biggest advantage to using radioisotopes over other forms of energy, such as coal, natural gas or petroleum is that.

Which agent of weathering breaks down limestone statues?

A charged particle moves at 2.5 * 104 m/s at an angle of 25° to a magnetic field that has a field strength of 8.1 * 10-2 T. If the magnetic force is 7.5 * 10-2 N, what is the magnitude of the charge?

Earthquakes along the subduction zones near Sumatra and Chile are some of the strongest in the world.

What number is between 2000 and 2500

If a car changes its velocity from 32 km/hr to 54 km/hr in 8.0 seconds, what is its acceleration?