srikanthpanga111

Conservation of Energy
1. A 20 kg rock is on the edge of a 100 m cliff. The rock fallsfrom the cliff. What speed does the rock have as it strikes theground?
2. Tarzan swings down from a tree limb that is 4.0 m above theground. How fast is he going when he reaches the ground?
3. Legend has it that Isaac Newton “discovered” gravity when a 0.20kg apple fell 7.0 m from a tree. How fast was it going when it hitNewton’s head?
4. A 28 kg boy slides down a ramp from a height of 4.8 m. How fastis the child going at the bottom of the slide?
5. An archer puts a 0.30 kg arrow to his bow. The bow has a springconstant of 155 N/m. The archer draws the bowstring back 0.70 m. Ifaimed straight up, how high does the arrow go?
6. A roller coaster car starts from rest at the top of a 20 m hill.How fast is the car going when it reaches the bottom?
7. If Abigail can throw a 100 g baseball at 36 m/s, how high wouldit go?
8. A BB gun can launch a BB with a speed of 52 m/s. If you aimstraight up into the air, how high will the BB go?
9. A weightlifter raises a barbell to a height of 1.95 m. She thendrops it and it falls to the ground. How fast will the barbell begoing?
10. A 50 kg artillery shell is shot from cannon to a maximum heightof 400 m. What was the launch velocity?
11. Neil Armstrong can jump straight up with a speed of 1.51 m/s.On the moon, where g = 1.63 m/s2, how high can he jump?
12. Lance Armstrong approaches a hill with a speed of 8.5 m/s. Hestops pedaling at coasts up the hill. At what height will he cometo a stop?
13. Peekaboo Street starts from rest at the top of a 45 m hill. Howfast is she going at the bottom?
14. A toy gun launches a dart with a 1650 N/m spring compressed0.09 m. If you aim this toy straight up, how high will the 0.0050kg dart go?
15. A roller coaster car starts from rest at the top of a 20 mhill. (a) How fast is the car going when it reaches the bottom? (b)How fast will the car be going when it gets to the top of the nexthill which is 10 m high?
16. A spring-loaded pistol has a 1650 N/m spring. A 22 g pellet isloaded and the spring is compressed 9.0 cm. (a) What is thepellet’s exit velocity? (b) If aimed straight up, how high will thepellet go?

You have been hired to design a spring-launched roller coaster thatwill carry two passengers per car. The car goes up a 10-m-highhill, then descends 17 m to the track's lowest point. You'vedetermined that the spring can be compressed a maximum of 2.0 m andthat a loaded car will have a maximum mass of 450 kg. For safetyreasons, the spring constant should be 10 % larger than the minimumneeded for the car to just make it over the top.

What spring constant should you specify?
k = 2.4×10^4 N/m (THIS IS CORRECT!)

What is the maximum speed of a 350 KG car if the spring iscompressed the full amount? (THE ANSWER TO THIS QUESTION IS NOT 19,NOT 18, AND NOT 21!)

You have been hired to design a spring-launched roller coaster thatwill carry two passengers per car. The car goes up a 11--high hill,then descends 17 to the track's lowest point. You've determinedthat the spring can be compressed a maximum of 2.3 and that aloaded car will have a maximum mass of 450 . For safety reasons,the spring constant should be 14 larger than the minimum needed forthe car to just make it over the top.

What is the maximum speed of a 360 car if the spring is compressedthe full amount?

a roller coaster ride is to be designed so that the speed of thecoaster at the bottom of the first drop is 120km/hr.

a) How high must the first hill be to achieve this speed?

b) if the next hill is 2/3 as high as the first, how fast will thecoaster be going as it goes over the second hill? give the answerin km/hr.

The roller coaster climb a hill then travel down to other side up another hill where ke greatest

A) top of the hill

B)bottom

C)halfway

D)top of second hill

people high in ______ are responsive to others' social and interpersonal cues.

You have designed a centrifuge system to separate cells from a solution. A mixture of water and cells enters the centrifuge system at a rate 1000 L/h and contains 500 mg cells/L. You can assume that the density is that of water (1 g/cm3). The inlet stream or feed (F), is separated to a cell-free supernatant (S), and a pellet (P) consisting of a solution containing water and cells. The mass fraction of cells in the pellet is 0.5. Using the data in the figure, calculate the mass flow rates mP (g/hr) and mS (g/hr).

Has hip-hop music, culture and style been co-opted and commercialized to the point of cultural

bankruptcy, support your answer

How have you been socialized to handle interpersonal conflict ? Has your knowledge been sufficient? Have you had to unlearn or relearn certain aspects of how to get through tough social situations?