PLS help it is a timed test!
1). Liz is on a swing. When Liz approaches the highest point of her swinging movement, which statement about her potential and kinetic energy is true?
A). Potential and kinetic energy are equal
B). Potential energy is lowest, and kinetic energy is the highest
C). Potential and Kinetic energy are both at zero.
D). Potential energy is highest, and kinetic energy is lowest
2). Which scientific description of heat is accurate?
A). Heat is the total thermal energy of any single object
B). Heat is the total kinetic energy of atoms in an object
C). Heat is the flow of thermal energy from one object to another
D). Heat is the average kinetic energy of atoms in an object.
3). Which gives the frequency of the wave in terms of its peaks?
A). The height of the tallest peaks
B). The height of the peaks divided by the width of the crest
C). The number of peaks passing a point per second
D). The number of peaks per meter
4). Which object has the following characteristics: reflects a lot of light, absorbs a little light, and transmits almost no light?
A). Sink faucet
B). Big white fluffy marshmallows
C). Charcoal
D). Orange Juice
5). Where is the magnetic field of a bar magnet the strongest?
A). Between the north and south poles
B). In the middle of the magnet
C). At the north and south poles
D). Next to the south pole
6). What causes nikel and certain other metals to be magnetic?
A). The influence of earth's magnetic field
B). The pattern of electrons in their atoms
C). The motion of protons in their atoms
D). Their atoms have more electrons
7). Which part of an electrical circuit resists the flow of the charge when it changes into other forms of energy?
A). Copper wires
B). Switch
C). Light bulb
D). Battery