Which of the following is an example of a lever?
a. knife
b. screw
c. nutcracker
d. pencil sharpener

An object moves from the position +34m to the position -15m in 15 seconds. what is it's total displacement? what is it's average velocity?

You are driving directly behind a pickup truck, going at the same speed as the truck. a crate falls from the bed of the truck to the road. (a) will your car hit the crate before the crate hits the road if you neither brake nor swerve? (b) during the fall, is the horizontal speed of the crate more than, less than, or the same as that of the truck?

Apatient has a history of poor nutrition. he has skin rashes, bleeding gums, and a cut that hasn’t healed in a long time. what vitamin deficiency most likely caused this symptom?