Astudent moves a box of books down the hall by pulling on a rope attached to the box. the student pulls with a force of 187 n at an angle of 25.6 ◦ above the horizontal. the box has a mass of 31.5 kg, and µk between the box and the floor is 0.19. the acceleration of gravity is 9.81 m/s 2 . find the acceleration of the box. answer in units of m/s 2 . 019 (part 2 of 2) 10.0 points now the student moves the box up a ramp (with the same coefficient of friction) inclined at 14.3 ◦ with the horizontal. b) if the box starts from rest at the bottom of the ramp and is pulled at an angle of 25.6 ◦ with respect to the incline and with the same 187 n force, what is the acceleration up the ramp? answer in units of m/s 2 .

Bone-strengthening physical activity done increases bone-mineral content and bone density in youth.

Explain the difference between each pair of concepts. a. frequency and relative frequency b. percentage and relative frequency a. select the correct choice below. a. frequency is the total number of observations in a data set. relative frequency is the number of times a particular distinct value occurs. b. frequency is the number of times a particular distinct value occurs. relative frequency is the ratio of the frequency of a value to the total number of observations. c. frequency is the total number of observations in a data set. relative frequency is the ratio of the number of times a particular distinct value occurs to the frequency. d. frequency is the number of times a particular distinct value occurs. relative frequency is the ratio of the frequency of two different values.

Which is the correct symbol for an isotope of iodine with 53 protons and 78 neutrons?