4.

All objects that have mass attract each other because of the Law of

Mass Attractions

Attractiveness of Matter

Universal Gravitation

Electromagnetism

car is travelling north at a constant speed of 20 m/s. A force is applied directly east on the car. The motion of the car will be change in which of these ways? A) The speed of the car will increase. B) The speed of the car will decrease.

A rock star plugs his guitar into a amplifier. The amplifier

Directions: Select each correct answer. More than one answer may be correct. Which of the following could be part of an effective plan to decrease the environmental impacts of using a resource?

What is radioisotope dating?

Is shooting a a basketball force

Which of the following does not describe a scientific theory?

A radiographer in a hospital is preparing a sample of technetium-99. Name two protective measures she should be to ensure she is safe from the radiation?

Carlota does 2000 J of work on a machine. The machine does 500 J of work. What is the efficiency of the machine?

Una locomotiva traina un solo vagone, che ha la sua stessa massa, con la forza di 4000 N. Alla locomotiva vengono aggiunti altri quattro vagoni identici al primo: quale forza deve sviluppare adesso la locomotiva affinché il convoglio mantenga la

which types of thermal energy transfer are primarily responsible for heating the water in a pot on a stove?