Your teammate is spinning a tennis ball on a string in a perfect circle. If the radius of the circle is 45 cm and the ball travels half the circumference of the circle in 1.5 seconds, what is the velocity of the ball rounded to the nearest whole number?

Identify the correct relation showing that the radius r of the orbit of a moon of a given planet can be determined from the radius r of the planet, the acceleration of gravity at the surface of the planet, and the time τ required by the moon to complete one full revolution about the planet. determine the acceleration of gravity at the surface of the planet jupiter knowing that r = 71 492 km and that t= 3.551 days and r= 670.9 × 10^3 km for its moon europa.