A 125 W motor accelerates a block along a level, frictionless surface at an average speed of 5.0 m/s. What force is supplied by the motor in the direction of motion??
a. 25 N b. 6.3 x 102 N c. 1.3 x 102 N d. 0.040 N

What is tan(61)? а. 1.80 b. 0.49 c. 0.61 d. 0.87

Suppose that a comet that was seen in 563 a.d. by chinese astronomers was spotted again in year 1951. assume the time between observations is the period of the comet and take its eccentricity as 0.986. what are (a) the semimajor axis of the comet's orbit and (b) its greatest distance from the sun?

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?