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Pelicans tuck their wings and free-fall straight down when diving for fish. Suppose a pelican starts its dive from a height of 20.0 m and cannot change its path once committed. If it takes a fish 0.20s to perform evasive action, at what minimum height must it spot the pelican to escape?...
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complete the equation for the following neutralization reaction. label each reactant and product as acide, base, salt, or water. NaOH H NO 3
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For each of the three sheets of polarizing material shown in the drawing, the orientation of the transmission axis is labeled relative to the vertical. The incident beam of light is unpolarized and has an intensity of 1510.0 W/m2. What is the intensity of the beam transmitted through the three...
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The loaded cab of an elevator has a mass of 2.8 x 103 kg and moves 223 m up the shaft in 26 s at constant speed. At what average rate does the force from the cable do work on the cab?
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A 80.0kg firefighter climbs a flight of stairs 24.0 m high.
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a 4.5kg dog stands on an 18 kg flatboat at distance D=6.1m from the shore. It walks 2.4m along the boat toward shore and the nstops Assuming no friction between the boat and the water, find how far the dog is then from the shore
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1 000-kg experimental rocket sled on level frictionless rails is loaded with 50 kg of propellant. It exhausts the propellant in a 20-s burn. If the rocket, initially at rest, moves at 150 m/s after the burn, what impulse is experienced by the rocket sled?
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A toy top with a spool of diameter 5.0cm has a moment of inertia of 3.0 10 5 about its rotation axis. To get the top spinning, its string is pulled with a tension of 0.30. How long does it take for the top to complete the first five revolutions? The string is long enough that it is wrapped...
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The third floor of a house is 10 m above street level. How much work is needed to move a 158 kg refrigerator to the third floor?
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A curve with a 120 m radius on a level road is banked at the correct angle for a speed of 20 {\rm m/s}.If an automobile rounds this curve at 30 {\rm m/s}, what is the minimum coefficient of static friction between tires and road needed to prevent skidding?
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- The Earth’s rate of rotation is constantly decreasing, causing the day to increase in duration. In the year 2000 the Earth takes about 0.548 s longer to complete 365 revolutions than it did in the year 1900.
- (a) What is the average angular acceleration of the Earth?
- (b) If this average acceleration remains constant, in what year will the Earths rotation come to rest?
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- A spherical balloon is made from a material whose mass is 3.00-kg. The thickness of the material is negligible compared to the 1.5-m radius of the balloon. The balloon is filled with helium (He) at a temperature of 305-degrees K and just floats in the air, neither rising nor falling. The density of the surrounding air is 1.19-kg/m^3. Find the absolute pressure of the helium gas
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