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A weather balloon is designed to expand to a maximum radius of 24 m at its working altitude, where the air pressure is 0.030 atm and the temperature is 200 K. If the balloon is filled at atmospheric pressure and 259 K, what is its radius at liftoff?
Ekapluto is an unknown planet that has two moons in circular orbits. Moon A: Mass = 4x10^20 kg Orbital radius = 2x10*8 m orbital period = 4x10^6 s, find the maximum gravitational force between the two moons
q1. the driver of an 1800 kg car travelling on a horizontal road at 100 kmh suddenly applies the brakes. because of a
A female gymnast weighs 620 N. If she is hanging stationary from a high bar, how many forces are acting on her.
A 15.1 mass fastened to the end of a steel wire with an unstretched length of 0.650 is whirled in a vertical circle with angular velocity 2.00 at the bottom of the circle. The cross-sectional area of the wire is 1.20×10?2 . Calculate the elongatio..
Calculate the position that a lens should be placed in order to achieve the maximum magnification. The length between the object plane and the image plane is 50cm and are fixed ( meaning they are restricted). Only the lens can be moved. The focal ..
A skier is gliding along at 3.0 m/s on horizontal, frictionless snow. He suddenly starts down a 10° incline. His speed at the bottom is 15 m/s. How long does it take him to reach the bottom
A parallel-plate capacitor with plates of area 600 cm2 is charged to a potential difference V and is then disconnected from the voltage source. What is the charge Q on the positive plate of the capacitor
430 cm3 of water at 86°C is mixed with 120 cm3 of water at 11°C. Calculate the final equilibrium temperature, What is the equilibrium temperature after initial heat loss
An aluminum cup contains 225 g of water and a 40-g copper stirrer, all at 27 °C. A 500-g sample of silver at an initial temperature of 87 °C is placed in the water. Calculate the mass of the aluminum cup
A 0.14-kg pinecone falls 16 m to the ground, where it lands with a speed of 13 m/s. What was the average force of air resistance exerted on the pinecone
A Carnot air conditioner maintains the temperature in a house at 294 K on a day when the temperature outside is 308 K
You pull downward with a force of 24.1 N on a rope that passes over a disk-shaped pulley of mass 1.35 kg and radius 0.0785 m. Calculate the tension in the rope on both sides of the pulley
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