A ball falls from rest through the air towards the ground. The diagram shows two forces acting onthe ball.air resistancegravitational forceAs the ball falls, the air resistance increases.Which statement is correct?AThe acceleration of the ball decreases,BThe acceleration of the ball increases.The speed of the ball decreases.D The gravitational force on the ball decreases.AВCDنقطة واحدةA bullet of mass 0.10kg travels horizontally at a speed of 600 m/s. It strikes a stationary woodenblock of mass 1.90 kg resting on a frictionless, horízontal surface.The bullet stays in the block.What is the speed of the bullet and the block immediately after the impact?A 30m/sB 32m/sC 60m/sD 134m/sAВ نقطة واحدةAn electric motor uses 1000 J of electrical energy. It provides 450 J of useful output energy.What is the efficiency of the motor?A 4.5%B 5,5%C 45%D 55%AВCDنقطة واحدةA helicopter takes off from the ground and rises vertically. It then hovers at a constant heightabove the ground.Which sequence of energy changes takes place during the gain in height?A chemical → gravitational potential → kineticBchemical → kinetic → gravitational potentialC gravitational potential -→ chemical → kineticD kinetic → chemical → gravitational potentialA OCD

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Description: A ball falls from rest through the air towards the ground. The diagram shows two forces acting onthe ball.air resistancegravitational forceAs the ball falls, the air resistance increases.Which statement is correct?AThe acceleration of the ball decre

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A ball falls from rest through the air towards the ground. The diagram shows two forces acting on the ball. air resistance gravitational force As the ball falls, the air resistance increases. Which statement is correct? A The acceleration of the ball decreases. B The acceleration of the ball increases. C The speed of the ball decreases. D The gravitational force on the ball decreases. A В D O

A ball falls from rest through the air towards the ground. The diagram shows two forces acting on the ball. air resistance gravitational force As the ball falls, the air resistance increases. Which statement is correct? A The acceleration of the ball decreases. B The acceleration of the ball increases. C The speed of the ball decreases. D The gravitational force on the ball decreases. A В D O

College Physics

11th Edition

ISBN:9781305952300

Author:Raymond A. Serway, Chris Vuille

Publisher:Raymond A. Serway, Chris Vuille

Chapter5: Energy

Section: Chapter Questions

Problem 63AP: A roller-coaster car of mass 1.50 103 kg is initially at the top of a rise at point . It then moves...

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