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SECTION 7.2 Work Done by a Constant Force 1. A shopper in a supermarket pushes a cart with a QC force of 35.0 N directed at an angle of 25.0° below the horizontal. The force is just sufficient to bal- ance various friction forces, so the cart moves at con- stant speed. (a) Find the work done by the shopper on the cart as she moves down a 50.0-m-long aisle. (b) The shopper goes down the next aisle, pushing hori- zontally and maintaining the same speed as before. If the friction force doesn't change, would the shopper's applied force be larger, smaller, or the same? (c) What about the work done on the cart by the shopper? 3. In 1990, Walter Arfeuille of Belgium lifted a 281.5-kg object through a distance of 17.1 cm using only his teeth. (a) How much work was done on the object by Arfeuille in this lift, assuming the object was lifted at constant speed? (b) What total force was exerted on Arfeuille's teeth dur- ing the lift?

SECTION 7.2 Work Done by a Constant Force 1. A shopper in a supermarket pushes a cart with a QC force of 35.0 N directed at an angle of 25.0° below the horizontal. The force is just sufficient to bal- ance various friction forces, so the cart moves at con- stant speed. (a) Find the work done by the shopper on the cart as she moves down a 50.0-m-long aisle. (b) The shopper goes down the next aisle, pushing hori- zontally and maintaining the same speed as before. If the friction force doesn't change, would the shopper's applied force be larger, smaller, or the same? (c) What about the work done on the cart by the shopper? 3. In 1990, Walter Arfeuille of Belgium lifted a 281.5-kg object through a distance of 17.1 cm using only his teeth. (a) How much work was done on the object by Arfeuille in this lift, assuming the object was lifted at constant speed? (b) What total force was exerted on Arfeuille's teeth dur- ing the lift?

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**Section 7.2: Work Done by a Constant Force** 1. A shopper in a supermarket pushes a cart with a force of 35.0 N directed at an angle of 25.0° below the horizontal. The force is just sufficient to balance various friction forces, so the cart moves at constant speed. - (a) Find the work done by the shopper on the cart as she moves down a 50.0-m-long aisle. - (b) The shopper goes down the next aisle, pushing horizontally and maintaining the same speed as before. If the friction force doesn’t change, would the shopper’s applied force be larger, smaller, or the same? - (c) What about the work done on the cart by the shopper? 3. In 1990, Walter Arfeuille of Belgium lifted a 281.5-kg object through a distance of 17.1 cm using only his teeth. - (a) How much work was done on the object by Arfeuille in this lift, assuming the object was lifted at constant speed? - (b) What total force was exerted on Arfeuille’s teeth during the lift?
Transcribed Image Text:**Section 7.2: Work Done by a Constant Force** 1. A shopper in a supermarket pushes a cart with a force of 35.0 N directed at an angle of 25.0° below the horizontal. The force is just sufficient to balance various friction forces, so the cart moves at constant speed. - (a) Find the work done by the shopper on the cart as she moves down a 50.0-m-long aisle. - (b) The shopper goes down the next aisle, pushing horizontally and maintaining the same speed as before. If the friction force doesn’t change, would the shopper’s applied force be larger, smaller, or the same? - (c) What about the work done on the cart by the shopper? 3. In 1990, Walter Arfeuille of Belgium lifted a 281.5-kg object through a distance of 17.1 cm using only his teeth. - (a) How much work was done on the object by Arfeuille in this lift, assuming the object was lifted at constant speed? - (b) What total force was exerted on Arfeuille’s teeth during the lift?
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