The bicycle wheel is spinning counterclockwise when viewed from above (so as you view the picture, the right hand side of the wheel is moving away from you). the man and stool are initially at rest. if the man now rotates the wheel’s axis 180˚ so that his right hand is above the wheel, the wheel/man/stool system will:
b. a car of mass 2000 kg with speed 7 m/s
the kinetic energy of an object is given by:
where m is the mass of the object and v is its speed.
from the formula, we see that the larger the mass and the speed of the object, the larger its kinetic energy. among the choices given, we see that the car with largest mass and largest speed is car b, which has a mass of 2000 kg and speed of 7 m/s. its kinetic energy is:
we can verify that the other cars have smaller kinetic energy. in fact:
- car a:
- car c:
- car d:
so, car b is the one which has most kinetic energy.
seat belts are among the most common and effective safety devices ever invented. since their introduction, seat belts have saved countless lives and prevented many injuries. but making it mandatory to wear seat belts has been a slow process, as they were required by law in each state at a different time.
b.) false pathology is the study of disease on the body.