5. An A36 W-beam steel guardrail has an allowable strength of 165MPa and E = 200GPa. The W-beam section has a cross sectional area of 14.35cm², and a length of 4.0m. If a vehicle collides with the end of the guardrail such that it is loaded axially along its length, what is the maximum kinetic energy the vehicle can impart to the guardrail before it exceeds its allowable strength?
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- In the figure, a 3.97 g ice flake is released from the edge of a hemispherical bowl whose radius ris 13.7 cm. The flake-bowl contact is frictionless. (a) How much work is done on the flake by the gravitational force during the flake's descent to the bottom of the bowl? (b) What is the change in the potential energy of the flake-Earth system during that descent? (c) If that potential energy is taken to be zero at the bottom of the bowl, what is its value when the flake is released? (d) If, instead, the potential energy is taken to be zero at the release point, what is its value when the flake reaches the bottom of the bowl? (a) Number (b) Number -5.34e-3 (c) Number 5.34e-3 (d) Number 5.34e-3 Units Units Units Ice flake- Mik Units J12:45 1 4) A roller coaster of mass 80.0 kg is moving with a speed of 20.0 m/s at position A as shown in the figure. The vertical height above ground level at position A is 200 m. Neglect friction. 200 m 160 m -- Potential Energy 0 A.What is the total mechanical energy of the roller coaster at point A? B. What is the total mechanical energy of the roller coaster at point B? C. What is the speed of the roller coaster at point B? Explain your D. What is the speed of the roller coaster at point C? answerIf R = 22.3 cm, M = 275 g, and m = 108 g in the figure, find the speed of the block after it has descended 12.9 cm starting from rest. Solve the problem using energy conservation principles.
- A spring that has a spring constant of k = 183.0 N/m is oriented vertically, with one end on the ground. What distance y must the spring compress for an m = 2.43 kg object placed on its upper end to reach equilibrium? y = By how much AUspring does the potential energy stored in the spring increase during the compression? AUspring = JA 28.0 kg child plays on a swing having support ropes that are 2.30 m long. A friend pulls her back until the ropes are 41.0° from the vertical and releases her from rest.I am unsure where to start on this problem how do I do it?
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- A 1300 kg wrecking ball hangs from a 10-m-long cable. The ball is pulled back until the cable makes an angle of 17.0 with the vertical. ▼ Part A By how much has the gravitational potential energy of the ball changed? Express your answer with the appropriate units. AU = 0 μA Value = Units ?9 Spaceman Spiff lost his ship's altimeter during a freak meteor storm, but he needs to know when to deploy his retro rockets to insure a safe landing back on earth. Luckily, he has his trusty toy dart gun whose spring has a 110 N/m spring constant. He loads his 7.2 gram suction cup dart, compresses the spring 4.0 cm, takes vertical aim at the cabin ceiling, and shoots. The suction cup dart flies 1.47 meters above its initial spring-compressed position. What is Spiff's altitude above earth? aHello, can you solve the first 3 parts? Thank you!