(a) A person pulls on a spring, stretching it by 3.0 cm, which requires a maximum force of 75 N. How much work did the spring do? (b) If the person compresses the spring 3.0 cm, how much work does the spring do?
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- L at i di ib il c L BMany roller coasters have loops where carts roll on a track that curves sharply up into the air. At the top, the people are upside down (and usually screaming). For safety reasons, many of these roller coasters must have a minimum speed at the top of the loop. In the roller coaster shown, the cart must have a minimum speed of 10.0 m/s at the top of the loop to make it around safely a) Assuming the roller coaster starts from rest at the top of the first hill and there is no friction on the roller coaster, what is the minimum height of the first hill? b) What power must be generated to bring a train of cars with a mass of 4560 kg to the top of the hill in 20.0 s?15. A skier is at the top of a frictionless hill. The hill makes an angle of 30.0° relative to the horizontal. What would be her acceleration down the hill? A. 2.9 m/s² B. 4.9 m/s² C. 3.3 m/s2 D. 3.8 m/s² E. 8.5 m/s²
- The resultant of a 4-N force acting upward and a 3-N force acting horizontally is a. 1 N d. 12 N b. 5 N c. 7 N In the absence of wind and air resistance, a projectile has its maximum range when fired at an angle with the ground a. of 30° c. of 45° b. of 60⁰ d. that depends upon the initial speed of the projectile When an object undergoes a. its mass increases b. its speed increases an acceleration c. it falls toward the earth d. a force acts on it An object in equilibrium may not have a. any forces acting on it b. any torques acting on it c. velocity d. accelerationHW4, Q9 I dont know what im doing wrongFind the equivalent resistance between points A and B shown in the figure (Figure 1). Consider R₁ = 4.7, R₂ =4.5, R₂ =1.3, R₁ = 1.8, R5 = 5.9, and R₁ = 5.8. Express your answer using two significant figures. ► View Available Hint(s) Req= IVE ΑΣΦ ? Ω
- Q5, plzA 48.42kg hunter ropes a 167.82 kg sleeping polar bear and pulls the bear towards him until they meet. Originally they are 211.22 m apart on frictionless ice. When the hunter pulls the polar bear to him the hunter will move... a. 52 b. 810 c. 67 d. 160A go go cart runs off the edge of a ledge as shown in the figure below. What must be its min speed as it leaves the cliff so that itll miss the ledge at the bottom, which is 1.75 m wide and 9.00 m below the bottom of the cliff. Vo 9.00m 1.75 m
- i need help on d,e,f,h,iYou are on one of those fast roller coasters that is traveling at 30 m/s and it accelerates at 4 m/s? for 4 seconds. How fast will it be going after it accelerates? c. 36 m/s. d. 26 m/s. a. 56 m/s. b. 46 m/s.1. A particle moving with a velocity vector as shown. Draw a force that would cause this particle to speed up and turn to its left.