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A lighter-than-air spherical balloon and its load of passengers and ballast are floating stationary above the earth. Ballast is weight (of negligible volume) that can be dropped overboard to make the balloon rise. The radius of this balloon is 5.90 m. Assuming a constant value of 1.29 kg/m3 for the density of air, determine how much weight must be dropped overboard to make the balloon rise 128 m in 28.0 s.
Water flows at the rate of 3.02 kg/s through a hose with a diameter of 3.08 cm. What is the speed of water in this hose, what is the speed of water in the nozzle
Suppose you are climbing up stairs, gaining 10 meters of height per minute. In order to do that, your body has to do some work, using energy, at a given rate. What is the power produced by your body? Ignore energy losses.
A uniform electric field of about 100 V/m pointing straight down, exists just above Earth's surface. what uniform surface charge density would be required
A 34.1 kg child rides a Ferris wheel whose diameter is 18.3 m. When the ride is turning at a constant rate, Find the normal force the seat exerts on the child at the top of the ride
Why is it sometimes better to use a small telescope in orbit around the Earth than it is to use a large telescope on a mountaintop?
Two cylindrical glass beads each of mass m = 32 mg are set on their flat ends on a horizontal insulating surface separated by a distance d = 3 cm. The coefficient of static friction between the beads and the surface is μs = 0.3. The beads are the..
how much time passes before the brick lands on the ground. If the wind speed is 26 mph, find the velocity of the plane in still air.
The voltage drop along a 30.0m segment of a power line made from copper wire ( a very good conductor) is 1.2 V, while carrying a current of 25.0A. How large is the electric field along the wire
A satellite is in a circular orbit about the earth (ME = 5.98 × 1024 kg). The period of the satellite is 1.20 × 104 s. Illustrate what is the speed at which the satellite travels?
A certain puddle of water has 1025 identical water molecules. As the temperature of this puddle falls to 0°C and below, the puddle freezes, resulting in a considerable change in the thermodynamic properties of this system.
You are a secret agent and find that you have been pushed out of an airplane without a parachute. what is your new terminal velocity with the coat
A student removes a 10.50 kg stereo from a shelf that is 1.802 m high. The amplifier is lowered at a constant speed to a height of 0.75 m. What is the work done by a) person and b) gravitational force that acts on the amplifier.
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