Must show all work to get full credit. [41] A 50 newton horizontal force pushes

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Must show all work to get full credit.


[41] A 50 newton horizontal force pushes a 10 kg mass sitting on a horizontal surface. Additionally, the horizontal surface exerts a 25 newton frictional force on the mass. What is the acceleration of the mass?

[42] A water wave oscillates up and down three times each second. The distance between wave crests is 2 m.
(a) What is its frequency?
(b) What is its wavelength?
(c) What is its speed of this wave?

[43] An isotope of the element Thallium, Tl-206, undergoes beta decay with a half life of 3.1 minutes. Assume you begin with 1.0 grams of the thallium isotope, what mass of the isotope will be left after 9.3 minutes have elapsed?

[44] Assume that a 6 volt energy source is in a circuit that has a resistance of 10 ohms. Determine the current and power. Provide numerical values and units.

Explanation / Answer

41) 50-25=10a a=2.5m/s62 42) f=1/3 44) i=v/r=6/10=0.6 p=vi=0.6x6=3.6 w

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