Recent content by SigFig

Homework Statement If 10-kg of ice at 0 degrees Celsius is added to 2-kg of steam at 100 degrees Celsius, the temperature of the resulting mixture is? Use Joules. ANSWER: 40 Homework Equations Specific Heats: Ice = 2060 Steam = 2020 Latent Heats: Water melting = 3.33x10^5...

Homework Statement When calculating weights away from Earth's surface, for example: At 6.38x10^3 km away from Earth's surface a spacecraft s weight is d=rE+rE or 2rE Then F=(1/4)(SpaceCraftWeight) What I don't understand is why the distance is rE+rE? Or when 1.28x10^4 km away d=rE+2rE or...

Homework Statement The carnival ride shown in Figure 7-18 has a 2.0 m radius and rotates once each .90 s a. Find the speed of the rider. b. Find the centripetal acceleration of the rider. c. What produces this acceleration? SOLUTIONS PROVIDED: a. 141 b. 98 c. --Explain-- Homework Equations...

Homework Statement A student threw a ball horizontally out a window 8.0m above the ground. It was caught by another student 10.0m away. What was the initial velocity of the ball? ANSWER PROVIDED: 7.16m/s Homework Equations dv=1/2at^2 t=vv/a dh=vht The Attempt at a Solution...

Homework Statement A broad jumper begins his jump at an angle of 22 degrees from the horizontal. At the middle of the jump he reaches a height of 70.0cm a. What is his horizontal velocity b. What is his horizontal displacement ANSWER: 9.16m/sHomework Equations dh=vht dv=1/2at^2 t=vv/a The...

So the 3060 would be subtracted from the elevators weight because it's accelerating upwards (against gravity) making it 7000?

So it would be W=mg 10 000=m(9.8) m=1020 F=ma F=1020(3) F=3060 3060+10 000 = F F= 13.1 kN?

Homework Statement An elevator weighing 10 000N is supported by a steel cable. Determine the tension in the cable when the elevator is accelerated upward at 3.0 m/s2 A) 7.0kN B) 10.0 kN C)11.6 kN D) 13.1 kN E) 40.0 kN Homework Equations F=ma W=mg (g=9.8m/s^2) The Attempt...