A tall man walking at 1.25 m/s accidentally bumps his head of mass 2.95 kg on a steel doorframe. His head stops in 0.011 s. a. What is the magnitude of the average force exerted by the doorframe on the man's head?
b. Explain why putting padding on the doorframe would help reduce this force.

In which of the following cases is work being done on an object? question 2 options: pushing against a locked door carrying a box down a corridor pulling a trailer up a hill suspending a heavy weight with a strong

Lymphocytes known as blastocysts make antibodies that fight infection. select the best answer from the choices provided t f

When considering gravity acceleration and the force of acceleration, what must be true? a. the direction of acceleration must be perpendicular to the direction of the force. b. the direction of the force and the direction of acceleration must be the same as each other. c. the direction of the force and the direction of acceleration must be opposite of each other. d. the mass of the body must be the same as the acceleration of the body.