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Explain why food stays fresh longer when kept in the refrigerator.
In the stratospheric level of the atmosphere there is a high level of ozone, O3. This ozone absorbs much of the ultraviolet light from the sun and thus protects life in the surface of the Earth from harmful high level of ultraviolet radiation.
Explain why one chlorofluorocarbon (CFC) molecule in the ozone layer is capable of breaking down hundreds and even thousands of ozone molecules?
The space shuttle takes off from Cape Canaveral in Florida and orbits Earth 15 times before landing back at Cape Canaveral 24hours and 15 minutes later. What is the average speed of the space shuttle
A light ray travels from medium 1 to medium 3 as shown in the figure What can we say about the relationship between the index of refraction for medium 1(n1)and the index of refraction for medium 3 (n3)? Could you thorougly explain why you obtained..
A hoop a disk and a solid sphere each have mass of 1.4 kg and a diameter of 16cm. starting from rest, all three objects roll down a 7 degree slope. find the speed of each at the bottom
A cue ball, which has a mass of 0.17 kg, collides head on with a stationary 8 ball, what was the speed of the cue ball before and after collision
The position of a particle is given by x = 3.9 cos pi t , where x is in meters and t is in seconds. Discover the speed and acceleration of the particle when x = 2.3 m. Discover the maximum speed and maximum acceleration of the particle.
A bat moving at 15.0 m/s emits a high-frequency sound as it approaches a wall that is 25.5 m away. how far away is it when it receives the echo
The current in a 100 watt lightbulb is 0.770 A. The filament inside the bulb is0.190 mm in diameter, What is the current density in the filament
A bullet with mass m = 5.21 g is moving horizontally at v = 434 m/s when it strikes a block of hardned steel with mass M = 14,8 kg (initially at rest). What is the impulse (kg m/s) exerted on the block
By holding a magnifying glass 35cm from your desk lamp, you can focus an image of the lamp's bulb on a wall 1.8m from the lamp
A ball of mass 0.18 kg moving with speed 11.3 m/s collides head-on with an identical stationary ball. (Notice that we do not know the type of collision.) Which of the following quantities can be calculated from this information alone?
A child in a wheelchair (total mass 56.5 kilogram) wins a race with a skateboarder. determine the work he did in pushing forward on his wheels during the downhill ride
A factory worker pushes a 28.6 kg crate a distance of 4.9 m along a level floor at constant velocity by pushing downward at an angle of 32 degrees below the horizontal. The coefficient of kinetic friction between the crate and floor is 0.26. How m..
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