Question 28

Uniform circular motion: A person on a sled coast down a hill and then goes over a slight rise with a speed of 2.8 m/s. The top of this rise can be modeled as a circle of radius 4.0 m. The sled and occupant have a combined mass of 110 kg. If the coefficient of kinetic friction between the snow and the sled is 0.10, what friction force is exerted on the sled by the snow as the sled goes over the top of the rise?

Question 4pts

Components: The components of vectorbareB_x= -3.5 andB_y= -9.7, and the components of vectorc areC_x= -6 andC_y= +8.1. What is the angle (less than 180 degrees) between b vectorsc and?

Group of answer choices

124

163

17

106

56

Question 5 1 pts Scalar (dot) product: If A = 4i - i + 4k and B = xi +2 7 - 5k, find x so B will be perpendicular to A . 1. Previous Next > Quiz saved at 3:34pm Submit QuizVector (cross) product: For the vectors shown in the figure, find the magnitude and direction of B x A , assuming that the quantities shown are accurate to two significant figures. 6 70 40 8 O 31, directed into the plane O 26, directed out of the plane O 31, directed out of the plane O 31, directed on the plane O 26, directed into the plane Previous Next Not saved Submit Quiz