An object with a mass m= 250 g is on a plane inclined at 30 degreesabove the horizontal and is attached by a string to a mass m = 150g. there is no friction and mass m hangs freely and isinitially at rest. when mass m has descended a distance h = 10 cm, its speed will be
(a) 35.0 cm/s
(b) 7.0 cm/s
(c) 140 cm/s
(d) 110cm/s
(e) 70.0 cm/s

Asample of a gaseous substance changes into a liquid

Aparticle moves in a circle 1.50 m in radius . through what angle in radians does it rotate if it moves through an arc length of 2.50m? what is the angle in degrees?

Consider two less-than-desirable options. in the first you are driving 30 mph and crash head-on into an identical car also going 30 mph. in the second option you are driving 30 mph and crash head-on into a stationary brick wall. in neither case does your car bounce off the thing it hits, and the collision time is the same in both cases. which of these two situations would result in the greatest impact force?