13. In which one of the following circumstances could mechanical en-ergy not possibly be conserved, even if friction and air resistance are ab-sent? (a) A car moves up a hill, its velocity continually decreasing alongthe way. (b) A car moves down a hill, its velocity continually increasingalong the way. (c) A car moves along level ground at a constant velocity.(d) A car moves up a hill at a constant velocity.

Conservation of energy: The total sum of the kinetic and potential energy is mechanical energy. If…

Answered: 13. In which one of the following…

College Physics

11th Edition

ISBN:9781305952300

Author:Raymond A. Serway, Chris Vuille

Publisher:Raymond A. Serway, Chris Vuille

Chapter1: Units, Trigonometry. And Vectors

Section: Chapter Questions

Problem 1CQ: Estimate the order of magnitude of the length, in meters, of each of the following; (a) a mouse, (b)...

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Two balls are thrown off a building with the same speed,one straight up and one at a 45° angle. Which statement istrue if air resistance can be ignored?(a) Both hit the ground at the same time.(b) Both hit the ground with the same speed.(c) The one thrown at an angle hits the ground with alower speed.(d) The one thrown at an angle hits the ground with ahigher speed.(e) Both (a) and (b)
On September 8, 2004, the Genesisspacecraft crashed in the Utah desert because its parachute did not open.The 210 kg capsule hit the ground at 311 km/h and penetrated the soilto a depth of 81.0 cm. How long did this force last?
o pox 2 SCCGIGLSIOU U U 5. A 15 kg block starts from rest starts 4m away from the end of a spring affixed to a 30° incline. ( loni odi to monod orb 2orlonon ri nsdw zod ort lo A) If the kinetic coefficient of friction of the block with the 01 oni incline is 0.3, calculate its velocity when it reaches the siano ori d onob how orl vh2o spring without calculating its acceleration.0od ono on ow ort o2Umoriod B) How much will the spring, with a spring constant of 20 N/m, compress when the block (momentarily) comes to a stop? [Don't forget that as the spring is compressed the gravitational potential energy of the block also changes.] 30°
A skier starts stationary at the top of a 20 m long slope and begins to descend. The skier's acceleration is 0.2 m/s?. At the bottom of the slope the skier glides under a frictional deceleration of 0.1 m/s?. (1) Calculate the speed of the skier at the bottom of the slope. (ii) Calculate how far the skier glides before coming to rest. An athlete of mass 70 kg begins to run, and is observed to have velocity over the first 5 strides of 3.0, 4.2, 5.0, 5.6, and 6.0 m/s. For each stride calculate the net impulse delivered due to the horizontal ground reaction force.
46. Roller coasters use some of the most sophisticated technology. Safety is a big part of that technology. One of the reasons roller coasters require such sophisticated safety computers is for insurance and legal purposes. During the 1920s, 30s and 40s, roller coasters had a reputation of being wild, rough and very dangerous. They pulled up to 12 Gs (about 120 m/s²), which often snapped peoples` necks! They also tended to derail and ram into each other. Modern day coasters are practically run by computers! Computers are so important for the safety of roller coasters, they make riding a coaster safer than walking across the street! Computer calculations make it possible to dip, loop and nearly scare you to death without harming you. In testing a model of a looping roller coaster, an engineer observes that the current design would result in a zero normal force acting on the passengers at the top of the loop. (a) If the radius of the loop is 4.0 m, what is the speed of the model coaster…
"While a roofer is working on a roof that slants at 38.0 ∘∘ above the horizontal, he accidentally nudges his 95.0 NN toolbox, causing it to start sliding downward, starting from rest." 1)If it starts 4.20 mm from the lower edge of the roof, how fast will the toolbox be moving just as it reaches the edge of the roof if the kinetic friction force on it is 22.0 NN?
Assume a 2510 kg truck is accelerating up a hill with an 18 o incline from an initial speedof 8.33 m/s. If the truck reaches a maximum speed of 27.0 m/s and gains an elevation of19.5 m. what is the applied force from the engine?
A 5,0 kg block starts sliding from rest, at a height of 1,0 m on a slope of 15º, without friction. After it leaves the slope it slides over a horizontal table top where the coefficient of kinetic friction is 0,25. Calculate the total distance that the block covers from when it starts sliding to when it stops.
6. Son Ye Jin (SYJ), 45 kg, drops from a helicopter 4 km above the ground. Assume the air resistance is proportional to the velocity of the SYJ, with k 15 N-sec/m when the chute is closed and with constant k₂ = 105 N-sec/m when the chute is open. If the chute does not open until 1 min after SYJ paraglides, when will she hit the ground?
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