17. Speed is the ratio of the distance an object moves to The displacement of the object The direction the object moves The amount of time needed to travel the distance

(A) mm (B) km (C) cm (D) m (E) all 2. Which one of the following is a suitable unit to measure the diameter of electric wire? (A) mm (B) km (C) cm (D) m (E) all 3. A hydrogen atom has a diameter of about 10 nm. (a) Express this diameter in meters. (b) Express this diameter in millimeters. (c) Express this diameter in micrometers.

Move the detector to the top center spotlight position at a $90^{\circ }$ angle to the metal foil stand. 3. Observe the number of hits in this spotlight position as compared with the first detector position. There are more hits than in the prior location. There are just a few hits,every few seconds I don't see any hits in the new location.

Feeling warmth from the sunlight on your skin is an example of: Conduction Convection Radiation Kinetic energy

Read the passage and answer the following questions. Atoms Everything around us is made up of atoms.Atoms are one of the smallest units of matter. An atom is too small to see directly through a microscope. The smallest speck that can be seen under an ordinary microscope contains more than ten billion atoms. An atom is more that a million times smaller than the thickness of a human hair. There are three pieces to an atom. They are protons, neutrons, and electrons. These are called subatomic particles. The center of the atom is called the nucleus. Neutrons and protons are located in the atomic nucleus. Electrons are very small particles located outside the nucleus. Each type of subatomic particle has a different electrical charge. A proton always has an electrical charge of $+1$ An electron always has an electrical charge of $-1$ A neutron has no electrical charge associated with it, a charge of 0.

Which particle has approximately the same mass as a proton? alpha beta electron neutron

Samuel spins a rubber stopper above his head.If he were to double the mass of the rubber stopper and keep the same centripetal acceleration, how would centripetal force change? $F_{C}$ would quarter $(1/4)$ $F_{C}$ would double (2) $F_{C}$ would quadruple (4) $F_{C}wouldhalve(1/2)$

Which event is an example of condensation? A. A lake becomes a skating rink in the winter. B. A spilled drop of rubbing alcohol disappears. C. A puddle dries when exposed to the Sun. D. Fog forms in a valley.

A barrel contains 285 kg of water. What is the volume of the water? $[?]m^{3}$

As water vapor rises in the atmosphere, it cools and changes into liquid cloud droplets in a process called A) condensation. B) vaporization. C) precipitation. D) evaporation

5. Which materials are natural sources of magnets? Select all that apply. cobalt magnetite lodestones ceramic