Joey and McKaleb build an electromagnet by wrapping a wire around a nail and connecting the wire to both terminals of a battery. When they connect the battery, they discover that the electromagnet can pick up 5 paperclips. They want to be able to pick up 8 paperclips. Joey and McKaleb brainstorm and think of 4 ways to modify their experiment so the electromagnet will pick up 8 paperclips. Which of these do you think they should try?

A) All of these will increase the strength of the magnet since the strength of the magnet can be increased by changing the wire loops or the battery.

B) Number 1 and 2 will increase the magnetic force, but number 3 and 4 will not increase the strength of the magnet.

C) Number 1, 2 and 4 will increase the strength of the magnet, reversing the battery will make the magnet repel the paperclips.

D) None of these will work. The boys should add a real magnet in addition to the electromagnet if they want to pick up more paperclips.

Rank the torques on the five doors shown in the figure above from least to greatest. note that the magnitude of all the forces is the same

Use the frequency histogram to complete the following parts. ​(a) identify the class with the​ greatest, and the class with the​ least, relative frequency. ​(b) estimate the greatest and least relative frequencies. ​(c) describe any patterns with the data. female fibula lengths 30.5 31.5 32.5 33.5 34.5 35.5 36.5 37.5 38.5 39.5 0 0.05 0.1 0.15 0.2 0.25 length (in centimeters) relative frequency a histogram titled "female fibula lengths" has a horizontal axis labeled "length in centimeters" from 30.5 to 39.5 in increments of 1 and a vertical axis labeled "relative frequency" from 0 to 0.25 in increments of 0.05. the histogram contains vertical bars of width 1, where one vertical bar is centered over each of the horizontal axis tick marks. the approximate heights of the vertical bars are listed as follows, where the label is listed first and the approximate height is listed second: 30.5, 0.02; 31.5, 0.04; 32.5, 0.05; 33.5, 0.13; 34.5, 0.22; 35.5, 0.25; 36.5, 0.13; 37.5, 0.06; 38.5, 0.09; 39.5, 0.01. ​(a) the class with the greatest relative frequency is nothing to nothing centimeters. ​(type integers or decimals. do not round. use ascending​ order.)

Suppose while hauling rocks, you accidentally drop one. it breaks apart in flat, planar sections. what type of rock did you just drop? 20 points