1. A 58 newton horizontal force pushes a 5.0kg mass sitting on a horizontal surface. Additionally, the horizontal surface exerts a 30 newton frictional force on the mass. What is the acceleration of the mass?
2. A 2200 kg car is moving at a speed of 30.0 m/s. Determine the stopping distance (in meters) if the brakes supply a force of 3500 newtons.
3. The number of people this planet can support is largely determined by the amount of ammonia-based fertilizer that can be produced. Without the ability to chemically manufacture ammonia, the world's population would be closer to 1/6 of its current size. Since the early thwentieth century ammonia has been produced via the prccess shown below.
3 H2 + N2 à 2 NH3
How many grams of ammonia are produced when 18.00 g of H2 react?
4. A solution has a hydroxide-ion concentration of 1.0x10^-5 mol per liter. What is the pH of this solution?
5. Assume that a 20.0 volt energy source is in a circuit that has resistance of 7.00 ohms. Determine the power consumption in watts.
6. An isotope of the element Thallium, Tl-206, undergoes beta decay with half-life of 3.1 minutes. Assume you begin with 56.00 grams of the thallium isotope, what mass of the isotope will be left after 9.3 minutes have elapsed.
7. A water wave oscillates up and down once every 3.00 seconds. The distance between wave crests is 2.65 m. The speed of this wave is ______ m/s.
8. The specific heat of a particular metal alloy is 0.27 calories per gram per degree Celsius. Calculate the amount of heat required (in calories) to raise the temperature of 4.9 kg of this material by 16 degrees.
9. A rock mass of 7.00 kg is dropped from a stationary hot air ballon. Its potential energy at the top is 18,000 J. When its potential energy is 10,000 J, the rock is falling at ________ m/s.
10. Two bowling balls, each with a positive charge of 2.5x10^-5 C, are located 25.0 cm apart. The size of the electric force between them is _______ N.