Q: To push a box up a ramp, which requires less force
To push a box up a ramp, which requires less force: pushing horizontally or pushing parallel to the ramp? Why?
See AnswerQ: A small compact car is pushing a large van that has broken
A small compact car is pushing a large van that has broken down, and they travel along the road with equal velocities and accelerations. While the car is speeding up, is the force it exerts on the van...
See AnswerQ: Consider a tug-of-war between two people who pull
Consider a tug-of-war between two people who pull in opposite directions on the ends of a rope. By Newton’s third law, the force that A exerts on B is just as great as the force that B exerts on A. So...
See AnswerQ: Boxes A and B are in contact on a horizontal, frictionless
Boxes A and B are in contact on a horizontal, frictionless surface. You push on box A with a horizontal 100-N force (Fig. Q4.31). Box A weighs 150 N, and box B weighs 50 N. Is the force that box A exe...
See AnswerQ: A crate of books rests on a level floor. To move
A crate of books rests on a level floor. To move it along the floor at a constant velocity, why do you exert less force if you pull it at an angle u above the horizontal than if you push it at the sam...
See AnswerQ: A manual for student pilots contains this passage: “When an
A manual for student pilots contains this passage: “When an airplane flies at a steady altitude, neither climbing nor descending, the upward lift force from the wings equals the plane’s weight. When t...
See AnswerQ: A small model car with mass m travels at constant speed on
A small model car with mass m travels at constant speed on the inside of a track that is a vertical circle with radius 5.00 m (Fig. E5.45). If the normal force exerted by the track on the car when it...
See AnswerQ: A flat (unbanked) curve on a highway has a radius
A flat (unbanked) curve on a highway has a radius of 170.0 m. A car rounds the curve at a speed of 25.0 m/s. (a) What is the minimum coefficient of static friction that will prevent sliding? (b) Suppo...
See AnswerQ: A 1125-kg car and a 2250-kg pickup truck
A 1125-kg car and a 2250-kg pickup truck approach a curve on a highway that has a radius of 225 m. (a) At what angle should the highway engineer bank this curve so that vehicles traveling at 65.0 mi/h...
See AnswerQ: The “Giant Swing” at a county fair consists of a
The “Giant Swing†at a county fair consists of a vertical central shaft with a number of horizontal arms attached at its upper end. Each arm supports a seat suspend...
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