The picture shows a rollercoaster car as it is about to descend a high hill. The car's speed at the top (point A) is 2 m/s, and the crest is 44 m high, as measured from the ground. a) Neglecting friction, what is the speed of the car at the bottom of the hill (point B), 5 m above ground? b) Suppose that the work done by friction reduces the energy by 5% during the descent. Compute the new speed at the bottom of the ride. Take the mass of the car and passengers combined to be 480 kg.

Aparticle with mass 1.81×10−3 kg and a charge of 1.22×10−8 c has, at a given instant, a velocity v⃗ =(3.00×104m/s)j^. what are the magnitude and direction of the particle’s acceleration produced by a uniform magnetic field b⃗ =(1.63t)i^+(0.980t)j^?

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.

What occurs during a combustion reaction