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- A horizontal spring with spring constant 210 N/m is compressed by 20 cm and then used to launch a 300 g box across the floor. The coefficient of kinetic friction between the box and the floor is 0.23. Part A What is the box's launch speed? Express your answer with the appropriate units. vf= Submit HA Value Request Answer Units ?A horizontal spring with spring constant 210 N/m is compressed by 20 cm and then used to launch a 250 g box across the floor. The coefficient of kinetic friction between the box and the floor is 0.23. Part A What is the box's launch speed? Express your answer with the appropriate units. Uf = Submit 0 μĂ Value Request Answer Units ?Part A On an essentially frictionless, horizontal ice rink, a skater moving at 5.0 m/s encounters a rough patch that reduces her speed by 50% due to a friction force that is 21% of her weight. Use the work-energy theorem to find the length of this rough patch. Express your answer in meters. s = Submit Previous Answers Request Answer X Incorrect; Try Again; 3 attempts remaining
- An E. coli bacterium can be modeled as a 0.50-um-diameter sphere that has the density of water. Rotating flagella propel a bacterium through 40° C water with a force of 75 EN, where 1 fN=1 femtonewton = 10-15 N. Part A What is the bacterium's speed in μm/s? Express your answer in micrometers per second. ΨΕ ΑΣΦ 7.16 107 DMC Submit Previous Answers Request Answer X Incorrect; Try Again ? um/sPart A A spring of force constant 240.0 N/m and unstretched length 0.220 m is stretched by two forces, pulling in opposite directions at opposite ends of the spring, that increase to 15.0 N. How long will the spring now be? Express your answer in meters. V ΑΣφ m = 1 Submit Request Answer Part B How much work was required to stretch it that distance? Express your answer in joules.A 62.0 kg skier is moving at 6.10 m/s on a frictionless, horizontal, snow-covered plateau when she encounters a rough patch 4.50 m long. The coefficient of kinetic friction between this patch and her skis is 0.300. After crossing the rough patch and returning to friction-free snow, she skis down an icy, frictionless hill 2.50 m high. ▼ Part A How fast is the skier moving when she gets to the bottom of the hill? Express your answer with the appropriate units. 1/2 = Submit ▾ Part B HA Value Request Answer Units ? How much internal energy was generated in crossing the rough patch? Express your answer with the appropriate units.
- Part A A 55 g rock is placed in a slingshot and the rubber band is stretched. The magnitude of the force of the rubber band on the rock is shown by the graph in (Figure 1). The rubber band is stretched 30 cm and then released. What is the speed of the rock? Express your answer with the appropriate units. HÁ Vf = Value Figure < 1 of 1 Submit Previous Answers Request Answer X Incorrect; Try Again; 5 attempts remaining FSp (N) 60- Return to Assignment Provide Feedback 40- 20 x (cm) 30 10 20Part A What is the minimum work needed to push a 900-kg car 860 m up along a 9.5° incline? Ignore friction. Express your answer with the appropriate units. WP = µÅ Value Units ?Compressed air is used to fire a 48 g ball vertically upward from a 1.0-m-tall tube. The air exerts an upward force of 1.0 N on the ball as long as it is in the tube. Part A How high does the ball go above the top of the tube? Express your answer to two significant figures and include the appropriate units. h = 3.24 Submit μα m Previous Answers Request Answer ? X Incorrect; Try Again; One attempt remaining
- A net force along the z-axis that has a-component F₂ = -12.0 N + (0.300 N/m²) x² is applied to a 4.50 kg object that is initially at the origin and moving in the -x- direction with a speed of 8.70 m/s. Part A What is the speed of the object when it reaches the point x = 7.60 m? Express your answer with the appropriate units. _O ī Submit μÀ Value Request Answer Units ?A 2.85 kg block on a horizontal floor is attached to a horizontal spring that is initially compressed 0.0340 m. The spring has force constant 860 N/m. The coefficient of kinetic friction between the floor and the block is 0.380. The block and spring are released from rest and the block slides along the floor. Part A What is the speed of the block when it has moved a distance of 0.0170 m from its initial position? (At this point the spring is compressed 0.0170 m.) Express your answer with the appropriate units. v= O ΕΞΑ Value Units ?A pile driver lifts a 250 kgkg weight and then lets it fall onto the end of a steel pipe that needs to be driven into the ground. A fall of 1.5 mm before striking the pipe drives the pipe in 40 cmcm. Part A What is the average force that the weight exerts on the pipe? (Hint: Let the weight be the system)