a 1 kg emery stone measuring 20 cm redium, is rotating with an angular speed of 39 revolutions per minute, when the motor is turned off. What tangent force is applied to the wheel so that it stops at 10 revolutions. a. 12,24 Rand/s b. 13,24 Rand/s c. 10,4 Rand/s d. 124 Rand/s

Objects a and b are visible in the night sky. six months later they are still visible, but object b shows less parallax than object a. which object is closer? a. a b. b c. you would need to wait another six months in order to figure this out. d. you would need to know the objects' angular diameters in order to figure this out.