Mechanics | Relativity Answers

a ball is rolling on the horizantal travels 12m and comes to a complete stop. the ball is subject to an acceleration of -1.2m/s squared. calulate original velocity, time to stop, and average velocity

A 10 pound object is suspended by a string from an overhead support. A horizontal force of 5.8 pounds is applied on the object. The measure of the angle which the string makes with the horizontal is
a. 30 degrees
b. 45 degrees
c. 60 degrees
d. 90 degrees

a pingpong ball and a golf ball are dropped ina vacuum chamber from the same height and at the same time. When they have fallen halfway, they have the same
a. Potential energy
b. Kinetic energy
c. Acceleration
d. Velocity

Blood in the arteries is flowing, but the effects of this flow can be ignored and the blood can be treated as static fluid. estimate the amount by which the blood pressure P2 in the anterior tibial artery at the foot exceeds the blood pressure P1 in the aorta at the heart when a person is
a) Reclining Horizontally
b) Standing

Given:
density = 1060 kg/m^3
height = b/wn the heart and foot = 1.35m

You are standing on a sheet of ice that covers the football stadium parking lot in Buffalo; there is negligible friction between your feet and the ice. A friend throws you a .400kg football that is traveling horizontally at 12m/s. Your mass is 65kg. If you catch the ball, with what speed do you and the ball move afterwards?

A 1 kg wooden block hanging from a 1 meter rope is struck by a 10g bullet moving horizontally is observed to rise 5cm. Assuming the bullet is lodged within the block, what must have been the speed of the bullet initially?

Calculate the moment of inertia I of the following system of two masses connected by a light rod of length 4 meters rotating about an axis O, 1 meter from mass 3kg and 3 meters from mass 5 kg.

A boy on a bicycle, whose tire's radius is .5m, is traveling with a speed of 5m/s and begins braking. A bug clings tightly to the edge of the tire on the side. The tire coasts to a stop with angular acceleration of -.2rads/s^2. (a) How long did it take the bike, boy & bug to stop? (b) How many revolutions did the bug travel through before coming to a stop from th initial braking?

What is the gravitational force between a teacher of mass 90 kg and a student of mass 60 kg if the student sits on the front row 2 m from the teacher?

Blood in the arteries is flowing, but the effects of this flow can be ignored and the blood can be treated as static fluid. estimate the amount by which the blood pressure P2 in the anterior tibial artery at the food exceeds the blood pressure P1 in the aorta at the heart when a person is
a) reclining horizontally
b) standing

Given:
density = 1060 kg/ m^3
height/displacement (b/wn the heart and foot) = 1.35m