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

Which of the following is an example of motion in two dimensions?

Agroup of students is studying convection currents. they fill two identical balloons with the same amount of helium. one balloon is placed in a freezer and the other in an area with warm air. after 10 minutes, the balloons are released from a height of 1 meter. which of the following do the students most likely observe? question 2 options: the balloons rise at the same rate. both balloons are the same size. the ballons both rise. the cold ballon is larger than the warm balloon. the cold balloon expands and rises. the warm balloon shrinks and sinks. the warm balloon expands and rises. the cold balloon shrinks and sinks.

The speed of light can be used to measure the