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Suppose an asteroid is found that appears to be heading directly toward Earth (using Earth's location at the time of discovery). It is 4.2 A.U. away (i.e., 4.2 times the Earth-Sun distance), and travelling through the Solar System with a speed of 20 km /sec. (a) How long would it take the asteroid to reach Earth (at Earth's location at the time of discovery), assuming the asteroid's speed is constant? (b) Will the Earth be at approximately the same location in its orbit around the Sun after the time interval computed in part (a)? Discuss what could happen.
Find the smallest particle size (density 2.65 grams per cubic cm) that will be removed in a horizontal grit chamber 10 meters long and 1.0 meter deep if the flow rate is 1000 cubic meters per hour. Suppose temperature is 25 ºC.
Liquid nitrogen boils at 77.00 K. Would this experiment needs to be altered if we used water, which boils at 373 K? Why.
If a power plant burns coal at 1000°C and the air temperature where the exhaust fumes cool is at 20°C, what is the maximum efficiency of the power plant?
Two blocks are placed in contact on a horizontal frictionless surface. The smaller box has less mass than the larger box. A force F is applied to the small box as shown so that the boxes accelerate to the right.
The total mass of the gas is 12.48 g. What is molecular mass of the gas? the gas expands so that the cylinder has twice the height. How much work did the gas do assuming the pressure remained constant.
A worker pushes horizontally on a large crate with a force of 304 N and the crate is moved 4.4 m. How much work was done.
The bullet becomes embedded in the block. If the bullet-block system compresses the spring by a highest of 90cm, what was the speed of the bullet at impact with the block.
A child looks at his reflection in a spherical Christmas tree ornament 8cm in diameter, and sees his image reduced by half. How long is his face from the ornament.
A whale comes to the surface to breathe and then dives at an angle of 20 degree below the horizontal.
the speed at which the ball left the quarterback's hand.
The height of a helicopter above the ground is given by h = 3.20 t3, where h is in meters and t is in seconds. At t = 1.95s, the helicopter releases a small mailbag. How long after its release does mailbag reach the ground.
A hot iron horseshoe (mass = 0.50- kg) which has just been forged, is dropped into 1.45 -L of water in a 0.50 kg iron pot at first at 22oC. If the final equilibrium temperature is 32oC, calculate the initial temperature of the hot horseshoe (in Ce..
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