[1] A 50 newton horizontal force pushes a 10 kg mass sitting on a horizontal sur

Question

[1] 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?

[2] 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?

[3] 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?

[4] 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.

[5] A solution has a hydronium-ion concentration of 1.0 x 10-5 mol per liter. What is the pH of this solution? Is this solution acidic or basic? What is the hydroxide-ion concentration of this solution?

[6] Balance the following chemical equations.
a. Ni + O2 ? Ni2O3
b. F2 + HBr ? Br2 + HF


7. You walk into a cave and shout out your name and you receive an echo 0.3 seconds later. How far are you from the cave wall?


8. What would be the temperature when 50 g of 40 0C water is mixed with 30 g of 60 0C water?



[1] How would you explain the difference between kinetic energy and potential energy? Give an example from the real world where potential energy is transferred to kinetic energy.

[2] How would you describe the differences between heat, temperature, and thermal energy? Give examples of how each term is used.

[3] Describe the components in the atom. Indicate the charge on each of the species and their location. Indicate the role, if any, that each plays in (a) chemistry and (b) nuclear processes.

[4] Describe the difference between an ionic bond and a covalent bond. Give an example of a compound that exhibits ionic bonding. Give an example of a compound that exhibits a covalent bond.

[5] What is the difference between mass and weight (give an example)? Describe if and how each would change if it was on the moon instead.

[6] What are the three main types of bonds? Briefly explain them and use an example for each.

Explanation / Answer

1. F = ma

a = 5 m/s2

2. a) 3 Hz

b) 2m

c) 6 m/s

3. 3 half lives

1 - 0.5 - 0.25 - 0.125g

0.125g

4. I = 6/10 = 0.6 A

Power = VI = 6 x 0.6 = 3.6 W

Please ask the rest options in a different questions.

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