4. In a tug-of-war match, your team is slowly pulling the rope (and the other team) to your side. a. Is your team doing any mechanical work against your opponent? If so, is the work positive or negative? b. Is your opponent doing any work against you? If so, is the work positive or negative?
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- 1. Calculate the work done on the suitcase by F→. Express your answer with the appropriate units. 2. Calculate the work done on the suitcase by the gravitational force. Express your answer with the appropriate units. 3.Calculate the work done on the suitcase by the normal force. Express your answer with the appropriate units. 4. Calculate the work done on the suitcase by the friction force. Express your answer with the appropriate units. 5. Calculate the total work done on the suitcase. Express your answer with the appropriate units. 6. If the speed of the suitcase is zero at the bottom of the ramp, what is its speed after it has traveled 3.90 mm along the ramp? Express your answer with the appropriate units.Which of the statements below is true when you catch a baseball that comes at you horizontally? a. The work that you do is positive. b. The work that you do is negative. c. Work is not a vector and cannot be referred to as positive or negative. d. Work is a scalar product expressed in terms of magnitudes, so it is never negative. e. Work is expressed in terms of kinetic energy, which must be positive.A body moves with increasing speed. Which of the following statements is true? A. The net work done on the body is positive, and the kinetic energy is increasing. B. The net work done on the body is positive, and the kinetic energy is decreasing. C. The net work done on the body is zero, and the kinetic energy is decreasing. D. The net work done on the body is negative, and the kinetic energy is increasing. E. The net work done on the body is negative, and the kinetic energy is decreasing.
- You lift your backpack from the ground and moved forward to your car. Which of the following statements is true? A. Work is done on the backpack while lifting it and moving it forward. B. Work is done on the backpack while lifting it and but not when moving it forward. C. No work is done on the backpack while lifting it but work is done on it when moving it forward. D. No work is done on the backpack at all.A box is pulled 2.0 meters along a rough surface at constant velocity using 100 N force inclined at 30° above the horizontal. a.If the force applied, Fa is doubled but the frictional force remains the same (this is unlikely to occur in practice since normal force changes), will the net work be the same? b. Is Fa is doubled with the frictional force unchanged how much kinetic energy would the block have after being pulled 2.0 m?Choose all the correct statement that applies to Work. A. Work is the product of force and distance. B. Work is a vector quantity. C. Work is a scalar quantity. D. work has magnitude only.
- A woman at the gym lifts a weight upwards. a) Does she do positive work on the weight, negative work on the weight, or no work on the weight? Explain how you know. b) Does the Earth (i.e. the force of gravity) do positive work on the weight, negative work on the weight, or no work on the weight? Explain how you know.Two children have identical spring-loaded catapults, which contain springs with spring constant k. If Samir compresses the spring in his catapult by a distance x and Mona compresses hers by a distance 2x, how does the work they have done to compress their catapults compare? A. Mona has done 2 times as much work as Samir. B. Samir has done 2 times as much work as Mona. C. They have done the same amount of work. D. Mona has done 4 times as much work as Samir.A 70.0 kg skier , starting with a speed of 1.00 m/s skies down a rough 17.0 m high ski hill and then goes up and off a ramp, as shown. a. What is the work done by friction as the skier travels down the hill from the start to the bottom of the hill? b. How high will the skier rise after leaving the bottom ramp? 2 Vo=1.0 m/s H=17.0 m V2=15.0 m/s
- A 50 kg skier leaves the top of a 10 m high frictionless slope (point "a") from rest and reaches the bottom of the slope (point "") with a speed v,. He subsequently continues sliding on level ground to a full stop to a point "c" due to friction (i.e. 0.2 on the level ground). a. Write an expression for the total mechanical energy of the skier at point "a". b. Write an expression for the total mechanical energy of the skier at point "b". c. Use the Work-Energy Theorem to determine the work done from point “b" to point “c".You push your physics book 2.10 m along a horizontal tabletop with a horizontal push of 2.10 N while the opposing force of friction is 0.700 N. A. How much work does your 2.10 N push do on the book? B. How much work does the friction force do on the book? C. How much work does the normal force from the table do on the book?