A copper wire of cross sectional area 2.0mm2 carries a current of 10A. How many electrons pass through a given cross section of wire in one second?

A 1.0*10^1. B 5.0*10^6. C 6.3*10^19. D 3.1*10^25

Which of the following tools measures weight? A balance A scale A cyclometer A graduated cylinder

Under what conditions can an ideal gas undergo a change of state without doing external work?

Students were asked to design an experiment to determine what affects the period of a pendulum. Which of the following should be the dependent variable (s) for the experiment? A. The angle of the swing B. The length of the string only C.

A ray diagram for a refracted light ray is shown. What does the dashed line represent? medium boundary normal incident ray

A sound wave traveling downward with a speed of about 4000 m per 2nd suddenly slows to 1500 m per 2nd not far below the Earth's surface what has the sound wave most likely encountered

A tradesman sharpens a knife by pushing it against the rim of a grindstone. The 35 cm diameter stone is spinning at 200 rpm and has a mass of 28 kg. The coefficient of kinetic friction between the knife and the stone is 0.20.

What is the unit for force we use when calculating F=ma?

A vector of magnitude 20 is added to a vector of magnitude 25. The magnitude of this sum. might be:. A. zero. B. 3. C. 12. D. 47. E. 50

Calculate the gravitational potential energy of a 10kg box on the top shelf of a closet, 2m above the floor

In late adulthood, changes in memory may bot be inevitable however, any decline in memory tends to invite