The drawing shows two boxes resting on frictionless ramps. one box is relatively light and sits on a steep ramp. the other box is heavier and rests on a ramp that is less steep. the boxes are released from rest at a and allowed to slide down the ramps. the two boxes have masses of 8 and 38 kg. if a and b are ha = 4.6 and hb = 1.3 m, respectively, above the ground, determine the speed of (a) the lighter box and (b) the heavier box when each reaches b. (c) what is the ratio of the kinetic energy of the heavier box to that of the lighter box at b?

An object is 10 cm from the mirror, its height is 1 cm and the focal length is 5 cm. what is the image height? (indicate the object orientation by including the + or - sign with the answer.) hi = cm +1 -1 +10 -10

Which statements about tornadoes are true? check all that apply. (a) about 12,000 tornadoes hit the united states every year. (b) a tornado looks like a funnel. (c) tornadoes are deadly atmospheric storms that cause millions in damages each year. (d) tornadoes can reach wind speeds of more than 300 miles per hour. (e) kansas is the state with the most tornadoes. (f) you will always notice a funnel before a tornado strikes.

Researchers determine that the biodiversity in a woodland region is declining. they identify two major threats to the region's biodiversity, a method to address each threat, and the expected outcome of each method. this information is shown in the table. a) reforestation would not benefit many species because most forest species live on the ground. b) reforestation would take the longest time to be effective because trees take several years to grow. c) biological augmentation would benefit only a few species because is is typically not very effective. d) biological augmentation would take less time to ve effective because it targets the majority of prey species.