Which answer is a scientifically accurate description of velocity?

walking south along the two-mile canyon trail generally takes less time than traveling the same trail north because walking south is all downhill.

the motorcyclist traveled along a highway at 55 mph and reached the campsite in less than the two-hour estimated time.

the hiker began hiking the park's five-mile north hiking trail at 8: 00 a. m. with plenty of daylight left to complete the hike before dark.

the boat traveled from the dock north to the 200-meter marker in the bay in less than 5 minutes, giving the passengers several more hours to fish.

edit: just finished the test and i got everything right except this one. i chose (b) but the correct answer was actually (d) the boat traveled from the dock north to the 200-meter marker in the bay in less than 5 minutes, giving the passengers several more hours to fish. hope this for ppl who needed the answer

Modify the equation fδt=δ (mv) to find the force of friction.

Chapter 23, problem 075 the figure shows a geiger counter, a device used to detect ionizing radiation (radiation that causes ionization of atoms). the counter consists of a thin, positively charged central wire surrounded by a concentric, circular, conducting cylindrical shell with an equal negative charge. thus, a strong radial electric field is set up inside the shell. the shell contains a low-pressure inert gas. a particle of radiation entering the device through the shell wall ionizes a few of the gas atoms. the resulting free electrons (e) are drawn to the positive wire. however, the electric field is so intense that, between collisions with gas atoms, the free electrons gain energy sufficient to ionize these atoms also. more free electrons are thereby created, and the process is repeated until the electrons reach the wire. the resulting "avalanche" of electrons is collected by the wire, generating a signal that is used to record the passage of the original particle of radiation. suppose the radius of the central wire is 24 âµm, the inner radius of the shell 2.3 cm, and the length of the shell 14 cm. if the electric field at the shell's inner wall is 2.8 ă— 104 n/c, what is the total positive charge on the central wire?

The softest and hardest minerals are: softest hardest