1. Two bowling balls with a positive charge of 2.5 x 10-5 C, are located 25.0 cm apart. The size of the electric force between them isN.
2. A rock of mass 6.00 kg is dropped from a stationary hot air balloon. Its potential energy at the top is 18,000 J. When its potential energy is 10,000 J, the rock is falling atm/s.
3. The specific heat of a particular metal allow is 0.25 calories per gram per degree Celsius. Calculate the amount f heat required (in calories) to raise the temperature of 4.0 kg of this material by 17 degrees.
4. A water wave oscillates up and down every 1.50 seconds. The difference between wave crests is 1.55m. The speed of this wave ism/s.
5. An isotope of the element Thallium, TI-206, undergoes beta decay with a half-life of 3.1 minutes. Assume you begin with 32.00 grams of the thallium isotope, what mass of the isotope will be left after 9.3 minutes have elapsed?