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Question: A balloon filled with helium gas has an average density of Ïb = 0.25 kg/m3. The density of the air is about Ïa = 1.23 kg/m3. The volume of the balloon is Vb = 0.048 m3. The balloon is floating upward with acceleration a.
a. Express the weight of the balloon, W, in terms of Ïb and Vb.
The coefficients of static and kinetic friction are 0.2 and 0.1 respectively. What is the minimum magnitude of the force F, parallel to the plane, that will prevent the block from slipping
Can you please help me set this problem up? Suppose that now you want to make a scale model of the solar system using the ball bearing .0014 m to represent the sun. (a) How far from it would you place a sphere representing the earth?
Two charged plates create a potential difference of 190 V. At a point halfway between the plates an electron is released from rest. What was the initial speed and direction of the proton
A 5.00-kW motor is used to pull a 20.0-kg crate up a 15.0°-incline of length 4.00 m. At what average velocity can the motor move the crate up the incline
two equal masses are attached to the ends of a spring whose force constant is k. With what frequency do they oscillate
A person walks into a room that has, on opposite walls, two planemirrors producing multiple images. When the person is 5.00 ft from the mirror on theleft wall and 10.0 ft from the mirror on the right wall, find the distances from the person to the..
A steel rod with an initial length of 800 cm and initial temperature at 0 degrees is heated to a final temperature of 40 degrees. Find the final length of the steel rod
Find the speed of the car when brakes were applied.
A regular hexagon shaped wire loop with a side length of a = 25.8 cm carries an electric current of I = 11.5 A as shown in the figure. Determine the size of the magnetic field at point P, the center of the hexagon.
A child and sled with a combined mass of 47.0 kg slide down a frictionless slope. If the sled starts from rest and has a speed of 2.70 m/s at the bottom, what is the height of the hill
why has patient confidentiality become a more difficult issue to deal with in the present health care
An 830 kilogram sports car can drive around an unbanked turn at a maximum speed of 58 m/s without slipping. Calculate what would be the maximum speed if no down force acted on the car
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