Thursday
June 20, 2013

# Posts by Crystal

Total # Posts: 688

chemistry
An element has ccp packing with a face-centered cubic unit cell. Its density is 1770 kg/m3 and the unit cell volume is 1.50 x 10-28 m3. Calculate the molar mass (g/mol) of the element to three significant figures.

physics
a motorboat is driven across a river at 5km/h at right angles to a current flowing at 3.9km/h. What is the resulting speed of the motorboat?

physics
2. Saturn has a radius of about 9.0 earth radii, and a mass 95 times the Earth’s mass. Estimate the gravitational field on the surface of Saturn compared to that on the Earth

chemistry
What are the the missing reactants for the double-displacement reaction that produces PF5 and AsCl3 ?

Statistics
I am not sure how to even get started on this question could someone help please. A college advisor wants to estimate the mean annual income of all college students who graduated last year. It is believed that the incomes follow a normal distribution with population standard d...

u.s. history II
What U. S. intelligence agency did Johnson illegally authorized to spy on domestic dissenters

physics
how do u find the horizontal force needed to push a wheel that weighs 300N and has a radius of 30m.it also lies on the stairs of 10m

English
cs means compound, cx means complex, f smeans fragment, s means simple, csc means simple compound subject and scv means simple compound verb. im only 12.

Physics
A ball on the end of a string travels in a horizontal circle at a constant speed. The circle has a circumference of 3 m, the ball has a speed of 2 m/s, and the centripetal force is 4 N. How much work is done on the ball each time it goes around? A) zero B) 6 J C) 8 J D) 12 J I...

Physics
If we examine a ball in free fall, we find that the momentum of the ball is not constant. This is not a violation of the law of conservation of momentum because A) the force of gravity acts on the ball. B) the ball experiences an external force. C) the system is not closed. D)...

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