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If a hot air balloon floats at a constant elevation (it has reached equilibrium) where the local atmospheric pressure is 98 kPa (abs) and outside air temperature is 285 K, and the hot air inside the balloon is at 400 K (and also at the local atmospheric pressure since the balloon is open at the bottom),
determine what volume the balloon must occupy if the basket, passengers and balloon material together weigh 5500 N?
(Hint- the hot air inside the balloon also has weight)
A 36 kg girl and a 7.9 kg sled are on the frictionless ice of a frozen lake, 20 m apart but connected by a rope of negligible mass. How far from the girl's initial position do they meet
The radius of our Sun is 6.96*10^8 m, and its total power output is 3.85*10^26 W. find lambda-max for the Sun
A cart has a mass of 851.8 g the attached string has a tension of 0.36 N and a displacement of 40.9 cm. what is the kinetic energy of the cart
You throw a ball with a speed of 25.0m/s at an angle of 40degrees above the horizontal directly toward a wall. The wall is22.0m from the release point of the ball. How long does the ball take to reach the wall
If 16 students lift a car . While holding the car off the ground, each person exerts an upward force of 400 N. What is the weight in pounds
A lens for a 35-mm camera has a focal length given by f = 54mm, What is the magnification of the image on the film
A bird stands on a dc electric transmission line carrying 3300A (Figure 1) . The line has 2.7×10?5? resistance per meter, and the bird's feet are 3.5cm apart
A vertical heat-insulated cylinder is divided into two parts by a movable piston of mass m. Find the final temperature of the gas
a 2.00 kg mass is connected to a spring with a spring constant of 9.00 N/m. What is the max velocity of the simple harmonic motion
A 0.19 kg meterstick has a 0.17 kg mass at its 40 cm mark and a 0.45 kg mass at the 85 cm mark. Where should the fulcrum be so the meterstick is balanced
The surface temperature of the start Betelgeuse is 3500K. Assume Betelgeuse radiates as a perfect blackbody. what is the energy of each of these photons
A uniform disk with a mass of 770 g and radius 17.0 cm is rotating on frictionless bearings with an rotational speed of 18.0 Hz, What is the new rotational speed of the disk
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