Guides d'étude, Notes de cours & Résumés

Physics Midterm Questions & Answers A 20-N weight and a 5.0-N weight are dropped simultaneously from the same height. Ignore air resistance. Compare their accelerations. - CORRECT ANSWER- equal A bullet is fired horizontally, and at the same instant a second bullet is dropped from the same height. Ignore air resistance. Compare the times of fall of the two bullets. - CORRECT ANSWER- equal A constant net force acts on an object. Describe the motion of the object. - CORRECT ANSWER- constant...

Physics One Questions & Answers A baseball pitcher throws a 100 mph fastball to batter Brandon Bopp. Bopp hits a 450 foot home run out of the park. When the ball contacts the bat, which force was greater: the force of the ball on the bat or the force of the bat on the ball? - CORRECT ANSWER- The two forces are the same A block has acceleration a when pulled by a string. If two identical blocks are glued together and pulled with twice the original force, what will their acceleration be? (1...

Physics Quizzes Questions & Answers A ball is thrown vertically upward from the surface of the earth. Consider the following quantities (1) the speed of the ball (2) the velocity of the ball (3) the acceleration of the ball A. 1 and 3 B. 1 and 3 C. 1 only D. 2 only E. 1, 2, and 3 - CORRECT ANSWER- A A ball is whirled on the end of a string in a horizontal circle of radius R at a constant speed v. The centripetal acceleration of the ball can be increased by a factor of 4 by A. Keepin...

Gravity Physics Questions & Answers How far apart are Pluto and Charon? - CORRECT ANSWER- 2.0 × 10^7 m If the distance from the moon to the satellite is 2.6 × 106 m, what is the mass of the satellite? - CORRECT ANSWER- 450kg In the equation for the gravitational force between two objects, which quantity must be squared? - CORRECT ANSWER- d The gravitational force between two objects is 3600 N. What will be the gravitational force between the objects if the mass of each object is reduced...

Physics : Exam Questions & Answers 60 mi/h is approximately - CORRECT ANSWER- 30. km/h A 10. kg mass, hung onto a spring, causes the spring to stretch 2.0 cm. The spring constant is - CORRECT ANSWER- 49 N/cm A 1000-kg car is moving at 30 m/s around a horizontal unbanked curve whose diameter is 0.20 km. What is the magnitude of the friction force required to keep the car from sliding? - CORRECT ANSWER- 9000 N A 170 lb halfback is tackled by a 245 lb guard. Therefore, the guard has a greate...

Physics Questions & Answers A 10 kg box is resting on a horizontal surface inside a warehouse calculate the normal force acting on the box - CORRECT ANSWER- 98.1 N A 50 Kg car travels clockwise in a Horizontal circle of radius 10 meters at 5 m/s what is the magnitude of the centripetal force acting on the car - CORRECT ANSWER- 150 N A 7000 N polar bear slides down an ice slide , if the slide makes an angle of 40 degrees with the ground calculate the accelerating force - CORRECT ANSWER- 4,4...

Exam: Physics Questions & Answers (0,0) - CORRECT ANSWER- The graph above describes the motion of a ball. At what point does the ball have an instantaneous velocity of zero? 0.0 m/s - CORRECT ANSWER- What is the speed of an object at rest? 0.0-5.0s - CORRECT ANSWER- According to the graph above, during which interval does the cat have the greatest positive velocity? 1 second - CORRECT ANSWER- The SI base unit for time is: 1/2Vcar - CORRECT ANSWER- A car travels down a road at a certain ve...

Physics Final Questions & Answers A 20 kg shopping cart moving at a velocity of 0.5 m/s collides with a store wall and stops. The momentum of the shopping cart - CORRECT ANSWER- decreases. A 75 kg person walking around a corner bumped into an 80 kg person who was running around the same corner. The momentum of the 80 kg person - CORRECT ANSWER- decreased. A ball is dropped from a person's hand to Earth. Identify an action-reaction pair in this situation. - CORRECT ANSWER- Earth exerts a f...

Physics Questions & Answers A 0.150 kg baseball is thrown upward with an initial speed of 20 m/s. a. What is the force on the ball when it reaches half of its maximum height? b. What is the force on the ball when it reaches its peak? - CORRECT ANSWER- a. -1.47 N b. -1.47 N A beach ball is left in the bed of a pick up truck. Describe what happens to the ball when the truck accelerates forward. - CORRECT ANSWER- The ball moves toward the back of the truck because inertia keeps it in place r...

MC Physics Questions & Answers *1.1.* An insulated container with a divider in the middle contains two separated gases. Gas 1 is initially at a higher temperature than gas 2. The divider is then removed. Which of the following observations might be made over a period of time as the two gases mix together, and why? - CORRECT ANSWER- On average, the molecules of gas 1 lose some of their kinetic energy to the molecules of gas 2 through collisions, resulting in the two gases eventually having t...