A radioactive substance decays in such a way that 1/3 of the substance is lost every 50 days Phere was originally 45 milligrams. Use the following model. What is the value of Ao example 140 A=A_(0)(b^t/c) __

100. A cup of hot chocolate has temperature $80^{\circ }C$ in a room kept at $20^{\circ }C$ After half an hour the hot chocolate cools to $60^{\circ }C$ a. What is the temperature of the chocolate after another half hour? b. When will the chocolate have cooled to $40^{\circ }C$

9. Explain how density differs from volume

True or False: Mass and weight are the same thing. True False

The center of gravity of a load: should be kept as high as possible it makes no difference how the vehicle is loaded is only a problem if the vehicle is overloaded can make a vehicle more likely to tip over on curves

Which of the following best defines accuracy in scientific measurement? How precisely instruments are made The speed of taking measurements The number of decimal places in a measurement How closely measurements match the real or accepted value

What is being transferred in a wave? A matter B medium C energy D water

A sound wave with a small amplitude will sound A Loud B Quiet C High Pitched D Low Pitched

Which type of telescope would you need to easily see a potential neutron star? ultraviolet X-ray visible light infrared

9. When the worker uses a pulley system to lift a 40 kg object a vertical distance of 2 m, What type of energy conversion occurs to perform this work, and how is the energy stored once the object is lifted?

What produces waves? A Sound B Heat C Vibrations D Light