Jenny takes her dog, a huge St. Bernard, for a walk on a wet, rainy day. She is wearing tennis shoes with rubber soles. The sidewalk is made of concrete. Let the static coefficient of friction between rubber and wet concrete be 0.80. Jenny finds that she cannot stop her dog from going where he wants. She can stop moving her feet, but he will drag her along so hard that her shoes simply slide along the top of the sidewalk. When the dog pulls with a force of 399 N, Jenny is dragged along behind him at a constant speed.

What is Jenny's mass?

A. 41 kg
B. 70 kg
C. 51 kg
D. 60 kg

Aspecimen of oil having an initial volume of 580cm^3 is subjected to a pressure increase of 4.0 mpa, and the volume is found to decrease by 0.40 cm^3. (a) what is the bulk modulus of the material? (b) what is the compressibility of the material?

What is the magnitude of the acceleration vector which causes a particle to move from velocity −5i−2j m/s to −6i+ 7j m/s in 8 seconds. answer in m/s.

Amerry-go-round of radius r, shown in the figure, is rotating at constant angular speed. the friction in its bearings is so small that it can be ignored. a sandbag of mass m is dropped onto the merry-go-round, at a position designated by r. the sandbag does not slip or roll upon contact with the merry-go-round. how would you rank the following different combinations of m and r on the basis of the angular speed of the merry-go-round after the sandbag "sticks" to the merry-go-round from largest to smallest. a) m = 10kg, r = 0.25r b) m = 20kg, r = 0.25r c) m = 10kg, r = 0.50r d) m = 10kg, r = 1.0r e) m = 15kg, r = 0.75r f) m = 40kg, r = 0.25r