7. A concave mirror forms on a screen an image of twice the linear dimensions of the object Objcct and screen are then moved until the image is three times the size of
the object. If the shift of the screen is 20cm, determine the shifts of the object and
the focal length of the mirror.

Very large accelerations can injure the body, especially if they last for a considerable length of time. one model used to gauge the likelihood of injury is the severity index ( ), defined as =/ . in the expression, is the duration of the accleration, but is not equal to the acceleration. rather, is a dimensionless constant that = the number of multiples of that the acceleration is equal to.in one set of studies of rear-end collisions, a person's velocity increases by 13.7 km/h with an acceleration of 36.0 m/s2 . let the + direction point in the direction the car is traveling. what is the severity index for the collision?

We put a force of 50n on an object and the acceleration is 100 m/s². what is the mass of the object?

Achild has maximum walking speed of 1.6 m/s. what is the length of the child's legs? 0.26 m