Skydiver _ will reach terminal velocity first and skydiver _ will have the fastest terminal velocity. Skydiver A has twice the mass (and therefore twice the weight) as skydiver B, and both have identical parachutes. All the animals landed in the water and were uninjured!) the elephant Two skydivers jump at the same time from an airplane at 10,000 feet. As the elephant and one of the bird feathers falls through the air, which has (not experiences the effect, but actually has) the greatest air resistance? (P.S. ![]() ![]() Various animals fall through the air as they become separated from the vehicle on its way down, including an elephant, birds, etc. forces are in equilibrium and net force = 0 N A truck carrying zoo animals looses control and drives off a cliff. cross sectional area / object's speed Which of the following statements is true when terminal velocity is reached by a falling object? a. If you push the box in the previous question, so that the box maintains a constant velocity of 13 m/s, what is the magnitude (pounds) of your pushing force after you get the box moving? 3 The force or air resistance on an object depends on the object's _ and _. If the box is stationary and you push with a 4 pound force on the box, which of the following is true? The magnitude of the frictional force acting on the box is 4 pounds and the box does not move. Between the surfaces, the maximum force of static friction is 5 pounds and the force of kinetic friction is 3 pounds. In space he is _ kg 80 Which of the following is not a vector quantity? speed A box sits on a horizontal surface. If the acceleration due to gravity is 10 m/s/s, what is the velocity of the ball (m/s) at the end of the 5th second? _ 10 What is the average velocity (m/s) of the ball in the previous question, through the first 5 seconds? 35 At what time (how many seconds into flight) will the ball in the previous question actually have velocity = 0 m/s? 6 An 80 kg astronaut leaves the Earth and does a space walk half way between the Earth and the Moon. How fast is the ball moving (m/s) at the end of the 3rd second? _ 18 How far does the ball in the previous question, move (m) in the first 3 seconds? _ 27 In a baseball game, a foul ball is hit straight up in the air from the Earth's surface, at 60 m/s. 28 How fast is the car in the previous question moving (m/s), at the end of 4 seconds? _ 7 What is the acceleration of the car in the previous question (m/s/s), at the end of the 4th second? 0 A ball rolls down a ramp with an acceleration of 6 m/s/s and with an initial velocity of 0 m/s. The car moves _ m in the first 4 seconds. 2 A car moves with a constant velocity of 7 m/s toward the east, for 5 seconds. 50 In the previous question, the car's average velocity is _ miles per hour toward the east? 30 A car speeds up from 4 m/s to 20 m/s in 8 seconds. The car's average speed is _ miles per hour. To get there you travel along a 500 mile winding road and the trip takes 10 hours. A city is 300 miles straight east of your home. ![]() Which of the following is true? The object is accelerating, has a net force acting on it, and is not in equilibrium. An object is in circular motion but at constant speed. an object's resistance to change in its state of motion Which of the following is true of an object in mechanical equilibrium? The object can be moving but must not be accelerating and must have 0 net force acting on it. kilogram / newton According to our lecture notes (Lecture 2) the measure of an object's inertia is the object's _. The Metric unit of mass is a _ and the Metric unit of force is a _. ![]() newton If g (acceleration of gravity) is approximately 10 m/s/s, and I have a 70 kg object, what is the mass of that object? (number only, no units, example: 140, 35, 350, but not necessarily one of these numbers) 70 What is the weight of the 70 kg object in the previous question? 700 What is the inertia of the 70 kg object in the previous two questions? 70 What happens to the force of gravity on an object, when the object is placed in a vacuum (not out in space, but on the Earth's surface)? The force of gravity is unchanged. static The metric unit of force is called a _. Equilibrium in which an object is at rest (not moving, velocity = 0) is called _ equilibrium.
0 Comments
Leave a Reply. |