An object moving with consta distance between two points 60 point is 15 m/s. find (a) the speed at the first point, distance from the point where the object was at rest to t tant acceleration along a horizontal path covers the en two points 60 m apart in 6.0 s. its speed as it passes the second the speed at the first point, (b) its acceleration and (c) the nt where the object was at rest to the first point. a ball thrown straight up takes 2.0 s to reach a height of 40 m. find (a) its initial speed, (b) its speed at this height, and (c) how much higher the ball will go.

Bone-strengthening physical activity done increases bone-mineral content and bone density in youth.

Scientists use laser range-finding to measure the distance to the moon with great accuracy. a brief laser pulse is fired at the moon, then the time interval is measured until the "echo" is seen by a telescope. a laser beam spreads out as it travels because it diffracts through a circular exit as it leaves the laser. in order for the reflected light to be bright enough to detect, the laser spot on the moon must be no more than 1.0 km in diameter. staying within this diameter is accomplished by using a special large-diameter laser. part a if λ = 540nm , what is the minimum diameter of the circular opening from which the laser beam emerges? the earth-moon distance is 384,000 km. express your answer to two significant figures and include the appropriate units.

Which law represents the thermodynamic statement of the conservation of energy of a system? a. the fourth law b. the first law c. the second law d. the third law