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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?
Computer hard drives are made of aluminum platters coated with a layer of magnetic material. How many such domains must a hard drive of 3 TB have (1 Byte = 8 bits)
A projectile is fired straight upward from the Earth's surface at the South Pole with an initial speed equal to one third the escape speed. What is the altitude of the projectile at this instant
A 1600-kg car starts from rest to reach 60.0 miles/h in 6.50 s. How much work is done by the engine during the acceleration
What will be the acceleration of three of these objects glued together if they are pulled by two rubber bands
Experimental measurement of the angles and sides of a right triangle: To what degree of accuracy can you read a protractor
Two astronauts are 1.40 m apart in their spaceship. One speaks to the other. The conversation is transmitted to earth via electromagnetic waves. How far away from the earth is the spaceship
An elevator has mass 550kg , not including passengers. The elevator is designed to ascend, at constant speed, What is the maximum number of passengers that can ride in the elevator
An 11.3 g bullet leaves the muzzle of a riflewith a speed of 570.5 m/s.What constant force is exerted on the bulletwhile it is traveling down the 0.9 m length ofthe barrel of the rifle?Answer in units of N.
The three resistors are identical with R1 = R2 = R3= 160 ?, and the battery voltage is 50 V. What is the current through resistor R2? R2 and R3 are parallel so these need to be treated with R1 as Requiv = R1+ (R2*R3)/R2+R3 but don't know where to ..
A photocathode whose work function is 2.5 eV is illuminated by white light of wavelength range from 380 nm to 720 nm. What is the stopping voltage Vnot for this experiment
Imagine a figure that shows a system of two masses connected by a string. As m falls a distance h, M accelerates up the plane. What is the work done by friction on the system
A square metal plate 0.180 m on each side is pivoted about an axis through point O at its center and perpendicular to the plate. Calculate the net torque about this axis due to the three forces shown in the figure if the magnitudes of the forces are ..
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