Physics 1 & 2 (B), Questions & Answers

Physics 1 & 2 (B), Questions & Answers A - ANSWER: A 10-kg block is pushed across a horizontal surface with a horizontal force of 20 N against a friction force of 10 N. The acceleration of the block is A) 1 m/s2. B) 2 m/s2. C) 5 m/s2. D) 10 m/s2. A - ANSWER: A 50-N object falling in air experiences 50 N of air resistance. The amount of net force on the falling object is A) 0 N. B) 25 N. C) 50 N. D) 100 N. A - ANSWER: A boat loaded with a barrel of water floats in a swimming pool. When the barrel of water is poured overboard, the pool level A) rises. B) falls. C) remains unchanged. A - ANSWER: A bullet fired from a rifle begins to fall A) as soon as it leaves the barrel. B) after air friction reduces its speed. C) neither A - ANSWER: A change in pressure at any point in a confined fluid at rest is transmitted A) undiminished to all points in the fluid. B) to points of lower pressure. C) in the direction of lower energies. A - ANSWER: A hockey puck slides across a frozen pond. If ice friction and air resistance are neglected, the force needed to keep the puck sliding at constant velocity is A) 0 N.