Answer soon! dan does 188.0 j of work raking leaves. if the rake does 128.0 j of work, what is the efficiency of the rake? a. 68.1 percent b. 147.0 percent c. 60.0 percent d. 316.0 percenta force of 29.0 n is used to lift a baby through a distance of 0.500 m. how much work is done on the baby? a. 29.5 j b. 58.0 j c. 14.5 j d. 28.5 j

What do elements in a family tend to share. a.) similar periods b.) similar groups c.) similar atomic symbols d.) similar chemical properties and characteristics

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?

The table below shows the acceleration of gravity on different bodies in the solar system. on which body would a 10 kg lamp has the most gravitational potential energy when lifted to a height of 2 m? a. earth b. mars c. neptune d. uranus