50 Phsich Quest ons A chair is a compound machine

QUESTION 1

  1. A chair is a compound machine.

2 points

QUESTION 2

  1. Your body is a compound machine.

2 points

QUESTION 3

  1. A lawn sprinkler is a compound machine.

2 points

QUESTION 4

  1. Which of the following is an example of a compound machine?

3 points

QUESTION 5

  1. Which of the following is an example of a compound machine?

3 points

QUESTION 6

  1. A car, a bicycle, a pair of scissors, a wheelbarrow, a shovel, and the human body are all examples of compound machines.

2 points

QUESTION 7

  1. A pizza cutter is a compound machine made up of what simple machines?

3 points

QUESTION 8

  1. A bicycle is a compound machine made up of which simple machines?

3 points

QUESTION 9

  1. The human body contains many examples of levers.

2 points

QUESTION 10

  1. The neck is an example of a simple machine in the human body.

2 points

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QUESTION 1

  1. Which of the following creates a voltage difference?

3 points

QUESTION 2

  1. Which of the following describes how electric charges flow?

3 points

QUESTION 3

  1. The electrical current in a circuit is measured in which of the following units?

3 points

QUESTION 4

  1. Electric current is the flow of which of the following through a wire?

3 points

QUESTION 5

  1. Which of the following is the tendency for a material to oppose the flow of electrons and change electrical energy into thermal energy?

3 points

QUESTION 6

  1. According to Ohm’s law, as resistance increases which of the following would the current do?

3 points

QUESTION 7

  1. When one light in a string of holiday lights goes and the rest of the string then also goes out, what type of circuit is used?

3 points

QUESTION 8

  1. Which of the following only allows one path for the current to flow through?

3 points

QUESTION 9

  1. Use the image below to answer the following question.
    Imported Asset
    If one of the light bulbs in the image goes out or doesn’t work anymore, none of the other light bulbs will work because they in a series circuit.

2 points

QUESTION 10

  1. The current running through a conductor that has a voltage of 120 and a resistance of 10 ohms is 12 amperes.

2 points

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QUESTION 1

  1. If two waves are in phase with one another and are moving through the same medium, they will undergo ________ interference.

3 points

QUESTION 2

  1. During destructive interference, two waves moving through the same medium will

3 points

QUESTION 3

  1. During destructive interference, two waves travel through the same medium and the effects of the first wave are ___________ the effects of the second wave.

3 points

QUESTION 4

  1. Destructive interference occurs when two waves meet and they cancel each other out so that no wave exists.

2 points

QUESTION 5

  1. A standing wave is a wave that appears fixed or stationary in space.

2 points

QUESTION 6

  1. Constructive interference in a standing wave occurs at the wave’s nodes.

2 points

QUESTION 7

  1. When a police officer receives information that you are speeding in your vehicle, she is using the ______________ of the wave to measure the Doppler Effect.

3 points

QUESTION 8

  1. A person that is behind a moving siren will interpret the frequency of the siren as being ___________ than it actually is.

3 points

QUESTION 9

  1. The Doppler Effect means that all observers of a moving wave source detect the same wave frequency.

2 points

QUESTION 10

  1. The Tacoma Narrow Bridge mostly likely collapsed because the wind caused the bridge to refract.

2 points

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QUESTION 1

  1. The energy absorbed by the surroundings is __________ the energy __________ by the reaction.

3 points

QUESTION 2

  1. Matter is _______ energy because matter is always ___________ in a chemical reaction.

3 points

QUESTION 3

  1. In an exothermic chemical reaction, the energy that is given off by the reaction comes from

3 points

QUESTION 4

  1. The bond enthalpy value for a carbon to hydrogen bond is 413 kJ. What does this mean?

3 points

QUESTION 5

  1. How many total oxygen (O) atoms are present in the reactants side of the equation C2H5OH + 3O2 → 2CO2 + 3H2O?

3 points

QUESTION 6

  1. In the chemical formula 3H2O, the number “3” is a

3 points

QUESTION 7

  1. Which number should be placed in the blank to make the equation balanced? 3 H2 + N2 → ____NH3

3 points

QUESTION 8

  1. What coefficients would balance the equation _MgS +_ Na2O →_Na2S +_ MgO?

3 points

QUESTION 9

  1. The following equation 2Al2O3 → 4Al + 3O2 shows that there are 4 atoms of Al and 6 atoms of oxygen in this reaction.

2 points

QUESTION 10

  1. The following reaction is balanced: 2Al2O3 → 4Al + 3O2

2 points

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QUESTION 1

  1. When a high-mass star explodes, which of the following is left over in the center?

3 points

QUESTION 2

  1. A pulsar is a type of __________ that rotates very rapidly and emits electromagnetic radiation.

3 points

QUESTION 3

  1. Which type of star will burn hydrogen in its core?

3 points

QUESTION 4

  1. What’s the difference between a main sequence star and a neutron star?

3 points

QUESTION 5

  1. Which of the following is a remnant of a supernova?

3 points

QUESTION 6

  1. The sun is considered a main-sequence star, because it is still fusing hydrogen into helium.

2 points

QUESTION 7

  1. High-mass stars are more massive, produce more energy, burn brighter, and have shorter life cycles than low-mass stars.

2 points

QUESTION 8

  1. Very hot stars usually look bluer, while very cool stars usually look redder.

2 points

QUESTION 9

  1. Main sequence stars have decreasing brightness with temperature.

2 points

QUESTION 10

  1. A star’s color depends on its ____________.
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